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HomeMy WebLinkAbout20191171 Skidmore Fitness and Tennis Center SWPPP The LA GROUP 40 Long Alley p 518-S87-8100 Saratoga Springs f 518 58"7 0180 NY 12866 www.thelagroup.com Landscape Architecture&Engineering P.C. Stormwater Pollution Prevention Plan Prepared in accordance with NYS DEC General Permit GP-0-15-002 for: Skidmore College Athletic Expansion Owner/Operator(s): Skidmore College 815 N Broadway Saratoga Springs, NY 12866 SWPPP Contact(s): The LA Group, PC 40 Long Alley Saratoga Springs, NY 12866 1-518-587-8100 1-518-587-0180 SWPPP Preparation Date: November 25, 2019 Table of Contents 1.0 PERMIT OVERVIEW AND REQUIREMENTS 1 1.1 PERMIT OVERVIEW 1 2.0 SWPPP REVIEW, UPDATE 1 2.1 SWPPP REVIEW 1 2.2 SWPPP UPDATE 2 3.0 SITE ASSESSMENT, EVALUATION AND PLANNING 2 3.1 PROJECT LOCATION 2 3.2 PRE-DEVELOPMENT CONDITIONS 3 3.3 PROJECT TYPE 3 3.4 PROJECT SCOPE 3 3.5 HISTORIC PRESERVATION DETERMINATION 3 3.6 RECEIVING WATERS 3 3.7 SOILS 3 4.0 EROSION AND SEDIMENT CONTROL 3 4.1 EROSION AND SEDIMENT CONTROL PRACTICES 3 4.2 EROSION AND SEDIMENT CONTROL DRAWINGS 4 4.3 CONSTRUCTION PHASING PLAN AND SEQUENCE OF OPERATIONS 4 4.4 EROSION AND SEDIMENT CONTROL PRACTICE MAINTENANCE 5 4.5 EROSION AND SEDIMENT CONTROL INSPECTION 5 4.6 CONTRACTOR SEQUENCE FORM 6 5.0 POST CONSTRUCTION STORMWATER MANAGEMENT PRACTICES 7 5.1 STORMWATER MANAGEMENT CONTROLS 7 5.2 GREEN INFRASTRUCTURE PRACTICES/RUNOFF REDUCTION TECHNIQUES 7 5.3 POST CONSTRUCTION STORMWATER MANAGEMENT DRAWINGS 8 5.4 HYDRAULIC AND HYDROLOGIC ANALYSIS 8 5.5 COMPARISON OF PRE AND POST CONSTRUCTION STORMWATER RUNOFF 9 6.0 POST CONSTRUCTION STORMWATER MAINTENANCE 9 6.1 MAINTENANCE TO BE PERFORMED 9 7.0 CONSTRUCTION WASTE 10 8.0 OFFSITE VEHICLE TRACKING 11 9.0 TEMPORARY STABILIZATION FOR FROZEN CONDITIONS 11 10.0 SPILL PREVENTION PRACTICES 12 11.0 CERTIFICATIONS 16 12.0 DEFINITIONS 21 Appendices A Notice of Intent (NOI) and MS4 Acceptance Form B Stormwater Management Report and Hydro CAD C Map Set — Location Map and Construction Drawing D SWPPP Inspection Forms —SWPPP Inspection Report E Other SWPPP Forms — Construction Sequence, SWPPP Plan Changes, Spill Response Form, Stormwater Management Practice Maintenance Log F SPDES General Permit GP-0-15-002 G Historic Preservation/Endangered Species Documentation H Deep Ripping and De-compaction (DEC, 2008) I Stormwater Maintenance Agreement Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 1 .0 PERMIT OVERVIEW AND REQUIREMENTS 1.1 Permit Overview This Stormwater Pollution Prevention Plan (SWPPP) is prepared to inform the landowner and construction personnel of the measures to be implemented for controlling runoff and pollutants from the site during and after construction activities. The objective of this plan is to comply with the New York Department of Environmental Conservation (NYSDEC) State Pollutant Discharge Elimination System (SPDES) General Permit for Stormwater Discharges from Construction Activities, Permit No. GP- 0-15-002 requirements. Any material conflicts between this plan and the site plans, specification or instructions, must be brought to the attention of the design professional. The project may have other permits and it is the responsibility of the owner and contractor to know and understand all permits. The operator will be issued a bill from New York State for a one hundred and ten dollar ($110.00) annual fee for the open GP-0-15-002 permit. The operator will also be billed by New York State for a one time one hundred and ten dollar ($110.00) per acre fee for the proposed disturbed soil area listed in the NOI, and finally a one time six hundred and seventy five ($675.00) per acre fee for the proposed increased impervious area listed in the NOI. The operator is responsible to maintain onsite in a secure location that is accessible during normal working hours to an individual performing a compliance inspection, the following information: ✓ the Notice of Intent (NOI), ✓ the NYS Department of Environmental Conservation NOI Acknowledgement Letter, ✓ the SWPPP, ✓ a copy of the General Permit (included in the SWPPP), ✓ MS4 SWPPP Acceptance Form (where applicable), and ✓ All inspection reports. Technical standards are detailed in the "New York State Standards and Specifications for Sediment and Erosion and Sediment Control (November 2016)", as well as illustrated on the Construction Drawings included in Appendix C. The design of post- construction stormwater control practices follow the guidance provided by "New York State Stormwater Management Design Manual." 2.0 SWPPP REVIEW, UPDATE 2.1 SWPPP Review Applicable Federal, State, and local regulatory agencies that have jurisdiction may elect to review this SWPPP and notify the permittee in writing that the SWPPP does The LA GROU P Page 1 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 not meet the requirements of their regulations. If the SWPPP needs to be revised, the permittee and the site contractor will make the required modifications within seven days of such notification and submit written certification to the notifying agency that the changes have been implemented. A copy of the SWPPP will be kept available on site for review by regulatory agencies, engineers, and subcontractors. This Project is located in the City of Saratoga Springs which is a regulated MS4 community; so, a copy of this SWPPP was sent to the city for review. A copy of the signed MS4 Acceptance form is provided in Appendix A of this SWPPP. 2.2 SWPPP Update The permittee identified in this SWPPP shall amend the SWPPP under the following conditions: ✓ Whenever the current provisions prove to be ineffective in minimizing pollutants in stormwater discharge from the site ✓ Whenever there is a change in design, construction or operation that could have an effect on the discharge of pollutants ✓ To address issues or deficiencies identified during an inspection by the qualified inspector, the Department or other regulatory authority ✓ To identify a new subcontractor that will implement any part of the SWPPP. If modifications are required to the post-stormwater management practices and the Project is within a regulated, traditional land use control MS4, the owner or operator of the Project must notify the MS4 in writing of any planned amendments or modifications to the post-construction stormwater management practice component of the SWPPP. Unless otherwise notified by the MS4, the owner or operator shall have the SWPPP amendments or modifications reviewed and accepted by the MS4 prior to commencing construction of the post-construction stormwater management practice. The SWPPP PLAN CHANGES, AUTHORIZATION, AND CHANGE CERTIFICATION form (Appendix E) must be filled out and a copy retained onsite during construction. If modifications are required to the post-stormwater management practices and the Project is not within a Regulated, Traditional Land Use Control MS4, the changes shall be documented in the SWPPP kept onsite. 3.0 SITE ASSESSMENT, EVALUATION AND PLANNING 3.1 Project Location The Project is located at Skidmore College 815 North Broadway Saratoga Springs, Saratoga County, NY 12866. Access to the site is off Perimeter Road. See Appendix C for a general site location map. The LA GROU P Page 2 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 3.2 Pre-Development Conditions The project area is located in the southern portion of the Skidmore College campus. The project area is comprised of paved tennis courts, sidewalks, road, lawn, forested area, and existing stormwater features. 3.3 Project Type The project is a mixture of redevelopment and new development. Any increases in impervious area at the sites have been designed in accordance with Chapter 4 of the NYSDEC Stormwater Management Design Manual and NYSDEC's General Permit (GP-0-15-002) for construction activities. All existing impervious area to be disturbed have been designed in accordance with Chapter 9 of the NYSDEC Stormwater Management Manual. 3.4 Project Scope The project includes the construction of a new athletic facility, outdoor tennis courts and sidewalks. The remainder of the proposed site improvements includes landscaping and stormwater controls. The Project Site represents the area that will be disturbed as a result of the Project. 3.5 Historic Preservation Determination/Endangered Species The project is not anticipated to disturb any historical or cultural resources nor will it impact any significant natural communities. Maps of the location and nearby historical and natural resources are included in Appendix E. 3.6 Receiving Waters The site drains to existing detention ponds on the south east corner of the lot which discharge to the city of Saratoga Springs closed drainage system. 3.7 Soils According to the Natural Resources Conservation Service (NRCS) Web Soil Survey, the area including and surrounding the Project Site is comprised of Galway Loam. Galway Loam is classified as `C'. Therefore, the site has been analyzed using `C' soils. 4.0 EROSION AND SEDIMENT CONTROL 4.1 Erosion and Sediment Control Practices Temporary Structural Practices ✓ Silt Fence The LA GROU P Page 3 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 ✓ Stabilized Construction Entrance Permanent Structural Controls ✓ Grading Temporary Stabilization Practices (including vegetative practices) ✓ Seed and mulch bare soil areas within 14 days of disturbance unless construction will resume in that area within 21 days. Permanent Stabilization Practices (including vegetative practices) ✓ Seed and mulch all disturbed areas. Slopes that are 3:1 or steeper should receive a Rolled Erosion Control Product (RECP), sodding, and or hydro- seeding a homogenous mixture of wood fiber mulch with tackifying agent. Refer to Construction Drawings attached in Appendix C for detailed information on each practice. 4.2 Erosion and Sediment Control Drawings Erosion and Sediment Control practices are shown on Construction Drawings included in Appendix C. 4.3 Construction Phasing Plan and Sequence of Operations The project will disturb less than five acres at a single time. ✓ Temporary structural erosion controls will be installed prior to earthwork as per the attached plans. ✓ Areas to be undisturbed for more than 14 days will be temporarily stabilized by seeding. ✓ Disturbed areas will be reseeded and mulched immediately after final contours are re-established and no more than 14 days after the completion of construction at that site. ✓ Temporary erosion control devices will not be removed until the area served is stabilized by the growth of vegetation and the area is certified as being stabilized by the Erosion Control Superintendent. Reference Construction Activities Sheet Start 4 Stop Number Sequence must include major items such as, but not limited to, clearing and grubbing, excavation and grading, utility and infrastructure installation and any other activity resulting in soil disturbance. Include installation of erosion and sediment control practices and timing of installation. Install erosion and sediment controls Week 1 The LA GROUP Page 4 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Rough grade site Weeks 2-3 Begin utility installation Weeks 3-6 Begin site construction Weeks 4 completion Monitor/maintain erosion and sediment control measures Ongoing Remove erosion and sediment control measures upon Ongoing stabilization of contributing areas 4.4 Erosion and Sediment Control Practice Maintenance ✓ Silt fence — maintenance shall be performed as needed and material removed when "bulges" develop in the silt fence. ✓ Stabilized construction entrance — entrance shall be maintained in a condition which shall prevent tracking. This may require periodic top dressing with additional aggregate. All sediment tracked onto or spilled on public rights of way shall be removed immediately. When necessary, wheels must be cleaned to remove sediment prior to entrance on public rights of way. When washing is required, it shall be done in an area stabilized with aggregate and wash water shall be directed away from streams or wetlands preferably to a broad grassed area or a stormwater pond. ✓ Rock outlet protection — once a riprap outlet has been installed, the maintenance needs are very low. It should be inspected after high flows for evidence of scour beneath the riprap. Repair should be immediate. ✓ Replace top-soil, mulch and seed where seeding has been disturbed. 4.5 Erosion and Sediment Control Inspection • It is recommended that a rain gage be installed at the site. • A qualified inspector shall conduct an assessment of the site prior to the commencement of construction and certify in an inspection report that the appropriate erosion and sediment controls described in the SWPPP and required by GP-0-15-002 have been adequately installed to ensure overall preparedness of the site for commencement of construction. • This qualified inspector must be a Licensed Professional Engineer, Certified Professional in Erosion and Sediment Control (CPESC), Registered Landscape Architect, or someone working under the direct supervision of, and at the same company as, the licensed Professional The LA GROUP Page 5 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Engineer or Registered Landscape Architect, provided they have received 4 hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity. After receiving the initial training, the qualified inspector shall receive 4 hours of training every 3 years. ■ The day-to-day erosion control activities on the site will be monitored by the construction manager. The qualified inspector (as defined by the NYS DEC SPDES regulations) and his crews will make at least one inspection every seven (7) days of erosion control devices, and non-stabilized areas during construction. A maintenance inspection report will be completed by the qualified inspector after each inspection. The report form to be completed by the inspector is attached in Appendix D. Reports should be compiled and maintained on-site in the SWPPP 3-ring binder. ■ All measures will be maintained in good working order; if repair is necessary, it will be initiated within 24 hours of report. The qualified inspector shall take photographs of any needed repairs and also photograph when the repairs are completed. These photographs will be time and date stamped and attached to the weekly inspection report. ■ Seeded and planted areas will be inspected for bare spots, washouts, and healthy growth. If necessary, spot reseeding or sodding will be implemented. ■ A trained contractor will be an employee from the contracting company responsible for the implementation of the SWPPP. This person will be onsite when any soil disturbing activities are being conducted. The trained contractor must have received 4 hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity. After receiving the initial training, the qualified inspector shall receive 4 hours of training every 3 years. This trained contractor cannot conduct the regular SWPPP compliance inspections unless they meet the qualified inspector qualifications. 4.6 Contractor Sequence Form The operator shall prepare a summary of construction status using the Construction Sequence Form (included in Appendix E) once every month. Significant deviations to the sequence and reasons for those deviations (i.e. weather, subcontractor availability, etc.), shall be noted by the contractor. The schedule shall be used to record the dates for initiation of construction, implementation of erosion control measures, stabilization, etc. A copy of this table will be maintained at the construction site and updated. The LA GROUP Page 6 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 5.0 POST CONSTRUCTION STORMWATER MANAGEMENT PRACTICES 5.1 Stormwater Management Controls The proposed Post Construction Stormwater Management controls on this project are listed below: ✓ Bioretention Basins ✓ Hydrodynamic Separator 5.2 Green Infrastructure Practices/Runoff Reduction Techniques The proposed Green Infrastructure practices or Standard Management practices with Runoff Reduction capabilities on this project are listed below: ✓ Bioretention Basins The provided runoff reduction volume is 0.048 ac-ft, which is less than the required water quality volume, 0.215 ac-ft. The minimum runoff reduction volume is 0.035 ac-ft, which is less than the provided runoff reduction volume. Soil Restoration Excessively compacted areas and areas of cut and fill on the Project Site will have soil restoration applied as needed and as specified in the table below. Attached in Appendix H is "Deep Ripping and De-compaction, (DEC 2008)." This methodology should be followed for soil restoration as specified in the table below: The LA GROUP Page 7 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Type of Soil Disturbance Soil Restoration Requirement Comments/Examples Minimal Soil Disturbance Restoration not permitted Preservation of Natural Features Areas where topsoil is stripped Restoration not required Clearing and Grubbing only-no change in grade HSG A&B HSGC&D Areas of cut and fill apply 6 inches of Aerate*and apply topsoil 6 inches of topsoil Heavy traffic areas onsite HSG A&B HSG C&D (especially in a zone 5-25 feet around buildings,but not within a Aerate and apply 6 Apply full Soil 5 foot perimeter around inches of topsoil Restoration** foundation walls) Keep construction equipment from Areas where Runoff Reduction Restoration not required,but may be crossing these areas. To protect and/or infiltration practices are applied to enhance the reduction newly installed practice from any applied specified for appropriate practices ongoing construction activities construct a single phase operation fence area. *Aeration includes the use of machines such as tractor-drawn implements with coulters making a narrow slit in the soil,a roller with many spikes making indentations in the soil,or prongs which function like a mini-subsoiler **Per"Deep Ripping and Decopmpaction,DEC 2008" • If compost amendment is required, 2 to 4 inches of screened compost will be incorporated into the soil. • Prior to application of the deep-ripping and de-compaction, the depth to bedrock or naturally occurring hardpan should be known so that the depth of tillage be adjusted according to those restrictive depths. • Soils with a slope that exceeds 10% will not have full soil restoration with deep-ripping and de-compaction due to potential for erosion from tilled soil. • Any soil tillage (deep or shallow) will not be done on soils that are excessively wet, as this will damage the soil. • Any tillage will not be done within approximately 10' of the drip-line of any existing established trees. • Any large stones that are unearthed during tillage should be removed from the surface prior to final surface preparation and vegetation establishment. 5.3 Post Construction Stormwater Management Drawings Post construction stormwater management controls are shown on Construction Drawings included in Appendix C. 5.4 Hydraulic and Hydrologic Analysis The program utilized for quantifying stormwater runoff rates and volumes was HydroCAD software, produced by Applied Microcomputer Systems of Chocorua, The LA GROUP Page 8 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 NH. The SCS 24-hour Type II design storms for 1, 10, and 100-year frequency rainfall were analyzed. ✓ Hydrologic/hydraulic analysis for all structural components of the stormwater control system for the applicable design storms (see Appendix B). ✓ Comparison of post-development stormwater runoff conditions with pre- development conditions (see Appendix B). ✓ Dimensions, material specifications and installation details for each post- construction stormwater control practice (see Appendix B and C). 5.5 Comparison of Pre and Post Construction Stormwater Runoff Stormwater Quantity. These calculations are based on the HydroCAD analysis. Pre Development Post Development 10 year, 24 hour storm (Qp) 63.64 CFS 61.89 CFS 100 year, 24 hour storm (Qf) 133.98 CFS 129.87 CFS Water Quality Volume Calculations The following was utilized to determine water quality volume: WQv= (P) (Rj(A) 12 Where: WQv= Water Quality Volume (acre/feet) P = 90% Rainfall Event Rv = 0.05 + 0.009(1) where I is impervious cover in percent A = Subcatchment area in acres Required Provided Water Quality Volume (WQv) 0.215 AC FT 0.216 AC FT 6.0 POST CONSTRUCTION STORMWATER MAINTENANCE 6.1 Maintenance to be Performed Skidmore College will be responsible for the continuous upkeep and maintenance of all post construction stormwater management facilities. Post-construction maintenance for this project will consist of regular inspections of permanent stormwater management facilities. These maintenance procedures are essential to assure continual performance of the stormwater management practices The LA GROU P Page 9 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 on your site. During the inspection and any maintenance activity to the stormwater management practices, the responsible party should fill out an inspection and maintenance log (Appendix E) to record that it was done. Catch Basins (All) • Sediment removal with a vacuum truck should be done at least once a year, preferably after spring runoff and then in early fall, or when they are at 50% capacity, whichever comes first. • Any mechanical valves should be operated for inspection every two months. Bioretention • Clean sediment out of pretreatment portion of the system when it accumulates to a depth of three inches or more • Clean trash and debris out of system as necessary • Dead or diseased vegetation should be replaced • When the filtering capacity of the filter diminishes substantially (when water ponds for more than 48 hours), the top few inches of discolored material shall be removed and be replaced with fresh material. The removed sediments shall be disposed of in an acceptable manner (i.e. landfill). • Silt and sediment should be removed from the filter bed when the accumulation exceeds one inch. • Areas devoid of mulch shall be re-mulched on an annual basis Hydrodynamic Separator • Inspections of the separator must be completed at a minimum of twice a year (Site specific maintenance frequency should be established during the first two or three years or operation) • Maintenance shall be performed if any internal components are broken or missing, inlet or outlet is obstructed or if the accumulation of trash, debris and/or oil in the baffled chambers around the vortex is significant. All maintenance shall be completed during dry weather when no flow is entering the system. • Maintenance shall be performed in accordance with the manufacturer's specifications. 7.0 CONSTRUCTION WASTE Waste Materials: All waste materials generated during construction will be disposed at a suitable landfill, or transfer station. Hazardous Waste: The project will not be a generator of hazardous waste and it is not anticipated that any hazardous waste will be generated during construction. If there are any materials generated, a licensed hazardous waste carrier will be contracted to dispose the hazardous material at a suitable disposal site. If hazardous materials are discovered during construction, the work will be stopped until the issue is resolved. The LA GROU P Page 10 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Waste: Portable sanitary facilities will be made available to construction personnel and will be serviced regularly. 8.0 OFFSITE VEHICLE TRACKING Excavation equipment involved with the construction will remain on the project site and will not regularly egress or ingress the site. Any trucks used to bring in materials or remove materials via municipal paved roads will do so over a stabilized construction entrance. If any off-site vehicle tracking occurs, the contractor will be directed to initiate, street sweeping program in the immediate vicinity of the site. 9.0 TEMPORARY STABILIZATION FOR FROZEN CONDITIONS The following temporary stabilization measures MUST be performed when construction is occurring during winter/frozen ground conditions. The following requirements do not supersede any other requirements of this SWPPP as they apply to non-frozen ground conditions. ■ Perimeter erosion control MUST still be installed prior to earthwork disturbance as per this SWPPP. ■ Any areas that cannot be seeded to turf by October 1 or earlier will receive a temporary seeding. The temporary seeding will consist of winter rye seeded at the rate of 120 pounds per acre (2.5 pounds per 1,000 square feet) or stabilized as per the temporary stabilization for winter construction/frozen conditions. ■ Any area of disturbance that will remain inactive for a period of 14 consecutive days MUST be mulched. This includes any previously disturbed areas that are covered with snow. ■ Mulch MUST consist of loose straw applied at the rate of 2 to 3 bales (90 to 100 pounds) per thousand square feet. ■ Mulch MUST be applied uniformly over the area of bare soil or bare soil that is covered with snow. For the latter condition, mulch MUST be applied on top of snow. ■ Using a tracked vehicle, mulch MUST be crimped into the bare soil/snow. The tracked vehicle MUST be driven across the mulched areas in at least two directions to maximize crimping of mulch into the soil/snow. ■ If mulch gets blown off an area to a significant degree, the site inspector WILL require that an area be re-mulched in accordance with Items 2 through 5 above, and this area WILL be included on the inspection checklist for the next inspection. ■ If a particular area repeatedly experiences loss of mulch due to wind, then the inspector WILL require that an alternative method be used to secure the mulch in place. Such alternatives may include the use of The LA GROUP Page 11 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 netting, tackifier or other methods deemed appropriate by the inspector. ■ During periods when snow is melting and/or surface soils are thawing during daytime hours, mulched areas MUST be re-tracked (crimped) as per Item 5 above at least once every seven days, more frequently if directed by the inspector. Additional mulch may be required to obtain complete coverage of an area. Biodegradable erosion control matting may be required on steeper slopes. ■ Additional stabilization measures for non-frozen ground conditions described in this SWPPP WILL be implemented at the time deemed appropriate by the inspector. During the winter season, if a site has been stabilized and soil disturbing activities have been suspended for the winter, weekly inspections can be suspended. However, monthly inspections must still be conducted. All normal weekly inspections must resume when soil disturbing activities resume. 10.0 SPILL PREVENTION PRACTICES Good Housekeeping and Material Management Practices The following good housekeeping and material management practices will be followed on site during the construction project to reduce the risk of spills or other accidental exposure of materials and substances to stormwater runoff. ■ Materials will be brought on site in the minimum quantities required. ■ All materials stored on site will be stored in a neat, orderly manner in their appropriate containers, and if possible, under a roof or other enclosure. ■ Products will be kept in their original containers with the original manufacturer's label. ■ Substances will not be mixed with one another unless recommended by the manufacturer. ■ Whenever possible, all of a product will be used up before disposal. ■ Manufacturer's recommendations for proper use and disposal will be followed. ■ The construction manager or his designee will inspect regularly to ensure proper use and disposal of materials on site. ■ The contractor shall prohibit washing of tools, equipment, and machinery in or within 100 feet of any watercourse or wetland. ■ All above grade storage tanks are to be protected from vehicle damage by temporary barriers. Inventory for Pollution Prevention Plan The materials and substances listed below are expected to be on-site during construction. The LA GROUP Page 12 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 • Petroleum for fueling vehicles will be stored in above ground storage tanks. Tanks will either be steel with an enclosure capable of holding 110% of the storage tank volume or of a Con-Store, concrete encased type typically employed by NYSDOT. Hydraulic oil and other oils will be stored in their original containers. Concrete and asphalt will be stored in the original delivery trucks. • Fertilizer may be stored on site in its original container for a short period of time prior to seeding. Original containers will be safely piled on pallets or similar devices to protect from moisture. • Paints and other similar materials will be stored in their original containers and all empty containers will be disposed of in accordance with label directions. • Portable sanitary facilities, which contain chemical disinfectants (deodorants) will be located on-site, with the disinfectants held in the tank of the toilet. Hazardous Products These practices are used to reduce the risks associated with hazardous materials. • Products will be kept in original containers unless they are not re- sealable. • Original labels and material safety data sheets will be retained; they contain important product information. • If surplus product must be disposed of, manufacturers' or local and State recommended methods for proper disposal will be followed. Spill Prevention The following product specific practices will be followed on site. Petroleum Products: • Construction personnel should be made aware that emergency telephone numbers are located in this SWPPP. • The contractor shall immediately contact NYSDEC in the event of a spill, and shall take all appropriate steps to contain the spill, including construction of a dike around the spill and placing absorbent material over this spill. • The contractor shall instruct personnel that spillage of fuels, oils, and similar chemicals must be avoided and will have arranged with a qualified spill remediation company to serve the site. • Fuels, oils, and chemicals will be stored in appropriate and tightly capped containers. Containers shall not be disposed of on the project site. The LA GROUP Page 13 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 ■ Fuels, oils, chemicals, material, equipment, and sanitary facilities will be stored/located away from trees and at least 100 feet from streams, wells, wet areas, and other environmentally sensitive sites. ■ Dispose of chemical containers and surplus chemicals off the project site in accordance with label directions. ■ Use tight connections and hoses with appropriate nozzles in all operations involving fuels, lubricating materials or chemicals. ■ Use funnels when pouring fuels, lubricating materials or chemicals. ■ Refueling and cleaning of construction equipment will take place in parking areas to provide rapid response to emergency situations. ■ All on-site vehicles will be monitored for leaks and receive regular preventative maintenance to reduce the chance of leakage. Any vehicle leaking fuel or hydraulic fuel will be immediately scheduled for repairs and use will be discontinued until repairs are made. Fertilizers: ■ Fertilizer will be stored in its original containers on pallets with water resistant coverings. ■ Proper delivery scheduling will minimize storage time. ■ Any damaged containers will be repaired immediately upon discovery and any released fertilizer recovered to the fullest extent practicable. Paints: ■ All containers will be tightly sealed and stored when not required for use. ■ Excess paint will not be discharged to the storm water system or wastewater system, but will be properly disposed of according to manufacturers' instructions or State and local regulations. Concrete Trucks: ■ Concrete trucks will be allowed to wash out or discharge surplus concrete or drum wash water only at designated locations on site. Asphalt Trucks: ■ Asphalt trucks shall not discharge surplus asphalt on the site. Spill Control Practices In addition to the good housekeeping and material management practices discussed in the previous sections of this plan, the following practices will be followed for spill prevention and cleanup. The construction manager or site superintendent responsible for the day-to-day site operations will be the spill prevention and cleanup coordinator. He will designate at least three other site personnel who will receive spill prevention and The LA GROUP Page 14 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 cleanup training. These individuals will each become responsible for a particular phase of prevention and cleanup. The names of responsible spill personnel will be posted in the material storage area and in the onsite construction office or trailer. • Manufacturers' recommended methods for spill cleanup will be clearly posted and site personnel will be made aware of the procedures and the location of the information and cleanup supplies. Any spill in excess or suspected to be in excess of two gallons will be reported to the NYSDEC Regional Spill Response Unit. Notification to the NYSDEC (1-800-457-7362) must be completed within two hours of the discovery of the spill. • Materials and equipment necessary for spill cleanup will be kept in the material storage area onsite. Equipment and materials will include but not be limited to absorbent pads, brooms, dust pans, mops, rags, gloves, goggles, activated clay, sand, sawdust, and plastic and metal trash containers specifically for this purpose. • All spills will be cleaned up immediately after discovery. • The spill area will be kept well ventilated and personnel will wear appropriate protective clothing to prevent injury from contact with spilled substance. • Spills of toxic or hazardous material will be reported to the appropriate State or local government agency, regardless of the size The LA GROUP Page 15 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 11 .0 CERTIFICATIONS Preparer Certification of Compliance with Federal, State, and Local Regulations This Stormwater Pollution Prevention Plan was prepared in accordance with the New York State Department of Environmental Conservation SPDES General Permit for Stormwater Discharges from Construction Activities (Permit No. GP-0-15-002), pursuant to Article 17, Titles 7, 8 and Article 70 of the Environmental Conservation Law. This SPDES General Permit implements the Federal Clean Water Act pertaining to stormwater discharges. Name: Doug Heller Title: Civil Engineer Signature: Date: Company Name: The LA Group, PC Owner Pollution Prevention Plan Certification I certify under penalty of law that this document and all attachments were prepared under my direction or supervision to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who are directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that false statements made herein are punishable as a Class A misdemeanor pursuant to Section 210.45 of the Penal Law. I understand that GP-0-15-002 requires site inspections be conducted by a qualified professional once every seven (7) days and when approved in writing by the NYSDEC, disturbances of greater than five (5) acres at one time require site inspections two (2) times every seven (7) days. These inspections shall be performed by a qualified professional as defined by the General Permit. The Owner/Operator will be held financially responsible for any and all fines related to work tasks that are not specified by the Contractor(s)/Subcontractor(s) below. Name: Title: Signature: Date: Company Name: The LA GROUP Page 16 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Contractor and Subcontractor Certification I hereby certify that I understand and agree to comply with the terms and conditions of the SWPPP and agree to implement any corrective actions identified by the qualified inspector during a site inspection. I also understand that the owner or operator must comply with the terms and conditions of the New York State Pollutant Discharge Elimination System ("SPDES') general permit for stormwater discharges from construction activities and that it is unlawful for any person to cause or contribute to a violation of water quality standards. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of the referenced permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceeding. Name Title Signature Date Company Name Address City, State, Zip Phone Number 1. 2. SWPPP Components 3. You Are Responsible For 4. 5. 6. Name of Trained Individual Responsible for SWPPP Implementation Title Signature of Trained Individual Responsible for SWPPP Implementation Date The LA GROUP Page 17 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Contractor and Subcontractor Certification I hereby certify that I understand and agree to comply with the terms and conditions of the SWPPP and agree to implement any corrective actions identified by the qualified inspector during a site inspection. I also understand that the owner or operator must comply with the terms and conditions of the New York State Pollutant Discharge Elimination System ("SPDES') general permit for stormwater discharges from construction activities and that it is unlawful for any person to cause or contribute to a violation of water quality standards. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of the referenced permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceeding. Name Title Signature Date Company Name Address City, State, Zip Phone Number 1. 2. SWPPP Components 3. You Are Responsible For 4. 5. 6. Name of Trained Individual Responsible for SWPPP Implementation Title Signature of Trained Individual Responsible for SWPPP Implementation Date The LA GROUP Page 18 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Contractor and Subcontractor Certification I hereby certify that I understand and agree to comply with the terms and conditions of the SWPPP and agree to implement any corrective actions identified by the qualified inspector during a site inspection. I also understand that the owner or operator must comply with the terms and conditions of the New York State Pollutant Discharge Elimination System ("SPDES') general permit for stormwater discharges from construction activities and that it is unlawful for any person to cause or contribute to a violation of water quality standards. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of the referenced permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceeding. Name Title Signature Date Company Name Address City, State, Zip Phone Number 1. 2. SWPPP Components 3. You Are Responsible For 4. 5. 6. Name of Trained Individual Responsible for SWPPP Implementation Title Signature of Trained Individual Responsible for SWPPP Implementation Date The LA GROUP Page 19 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Contractor and Subcontractor Certification I hereby certify that I understand and agree to comply with the terms and conditions of the SWPPP and agree to implement any corrective actions identified by the qualified inspector during a site inspection. I also understand that the owner or operator must comply with the terms and conditions of the New York State Pollutant Discharge Elimination System ("SPDES') general permit for stormwater discharges from construction activities and that it is unlawful for any person to cause or contribute to a violation of water quality standards. Furthermore, I understand that certifying false, incorrect or inaccurate information is a violation of the referenced permit and the laws of the State of New York and could subject me to criminal, civil and/or administrative proceeding. Name Title Signature Date Company Name Address City, State, Zip Phone Number 1. 2. SWPPP Components 3. You Are Responsible For 4. 5. 6. Name of Trained Individual Responsible for SWPPP Implementation Title Signature of Trained Individual Responsible for SWPPP Implementation Date The LA GROUP Page 20 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 12.0 DEFINITIONS Construction Activity(ies) - means any clearing, grading, excavation, filling, demolition, or stockpiling activities that result in soil disturbance. Clearing activities can include, but are not limited to, logging equipment operation, the cutting and skidding of trees, tree removal, stump removal and/or brush removal. Construction activity does not include routine maintenance that is performed to maintain the original line and grade, hydraulic capacity, or original purpose of a facility. Construction Phasing Plan - a plan designed to construct particular portions of an individual project at different times. Phasing is often used when a project is very large to limit the disturbance at a single time to 5 acres per phase. Erosion and Sediment Control Practices — temporary measures installed prior to construction and maintained during construction to temporarily treat any stormwater runoff. Once construction is completed and post-construction stormwater management practices are installed and the site is stabilized, the erosion and sediment control practices are removed from the site. Final Stabilization - means that all soil disturbance activities have ceased and a uniform, perennial vegetative cover with a density of eighty (80) percent over the entire pervious surface has been established; or other equivalent stabilization measures, such as permanent landscape mulches, rock rip-rap or washed/crushed stone have been applied on all disturbed areas that are not covered by permanent structures, concrete pavement. Green Infrastructure — in the context of stormwater management, the term green infrastructure includes a wide array of practices at multiple scales to manage and treat stormwater, maintain and restore natural hydrology and ecological function by infiltration, evapotranspiration, capture and reuse of stormwater, and establishment of natural vegetative features. On a regional scale, green infrastructure is the preservation and restoration of natural landscape features, such as forests, floodplains and wetlands, coupled with policies such as infill and redevelopment that reduce overall imperviousness in a watershed or ecoregion. On the local scale green infrastructure consist of site and neighborhood specific practices and runoff reduction techniques. Such practices essentially result in runoff reduction and or establishment of habitat areas with significant utilization of soils, vegetation, and engineered media rather than traditional hardscape collection, conveyance and storage structures. Some examples include green roofs, trees and tree boxes, pervious pavement, rain gardens, vegetated swales, planters, reforestation and protection and enhancement of riparian buffers and floodplains. Impervious Area (Cover) - means all impermeable surfaces that cannot effectively infiltrate rainfall. This includes paved, concrete and gravel surfaces (i.e. parking lots, driveways, roads, runways, and sidewalks); building rooftops, and miscellaneous impermeable structures such as patios, pools, and sheds. The LA GROUP Page 21 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Municipal Separate Storm Sewer (MS4) — a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains): i. Owned or operated by a state, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes, including special districts under State law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or a designated and approved management agency under section 208 of the CWA that discharges to surface waters of the State. ii. Designed or used for collecting or conveying stormwater iii. Which is not a combined sewer iv. Which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40 CFR 122.2. Notice of Intent — a standardized format notification sent to the NYSDEC to inform them of the proposed activity to be sent after the SWPPP has been completed. Owner or Operator— means the person, persons or legal entity which owns or leases the property on which the construction activity is occurring; and/or an entity that has operational control over the construction plans and specifications, including the ability to make modifications to the plans and specifications. Post-Construction Stormwater Management Practices — permanent devices constructed or installed onsite to treat stormwater from a site when construction is completed. Qualified Inspector— means a person that is knowledgeable in the principles and practices of erosion and sediment control, such as a licensed Professional Engineer, Certified Professional in Erosion and Sediment Control (CPESC), Registered Landscape Architect, or other Department endorsed individual(s). It can also mean someone working under the direct supervision of, and at the same company as, the licensed Professional Engineer or Registered Landscape Architect, provided that person has training in the principles and practices of erosion and sediment control. Training in the principles and practices of erosion and sediment control means that the individual working under the direct supervision of the licensed Professional Engineer or Registered Landscape Architect has received four (4) hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity. After receiving the initial training, the individual working under the direct supervision of the licensed Professional Engineer or Registered Landscape Architect shall receive four (4) hours of training every three (3) years. It can also mean a person that meets the Qualified Professional qualifications in addition to the Qualified Inspector qualifications. Qualified Professional — means a person that is knowledgeable in the principles and practices of stormwater management and treatment, such as a licensed Professional The LA GROUP Page 22 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Engineer, Registered Landscape Architect or other Department endorsed individual(s). Individuals preparing SWPPPs that require the post-construction stormwater management practice component must have an understanding of the principles of hydrology, water quality management practice design, water quantity control design, and, in many cases, the principles of hydraulics. All components of the SWPPP that involve the practice of engineering, as defined by the NYS Education Law (see Article 145) , shall be prepared by, or under the direct supervision of, a professional engineer licensed of practice in the State of New York. Regulated, Traditional Land Use Control MS4 - means a city, town, or village with land use control authority that is required to gain coverage under New York State DEC's SPDES General Permit for Stormwater Discharges from Municipal Separate Stormwater Sewer Systems (MS4s). Sequence of Operations —the individual steps and their specific order which are undertaken in order to construct a project or a given phase of a project from beginning to end. (i.e. clearing, grading, foundation work, landscaping, etc.) State Pollutant Discharge Elimination System (SPDES) — means the system established pursuant to Article 17 of the Environmental Conservation Law (ECL) and 6 NYCRR Part 750 for issuance of permits authorizing discharges to the waters of the state. Stormwater Pollution Prevention Plan (SWPPP) - a report that is compiled providing detailed information about the proposed activity and the specifics to how the stormwater will be managed during construction and after construction is completed. Surface Waters of the State - shall be construed to include lakes, bays, sounds, ponds, impounding reservoirs, springs, rivers, streams, creeks, estuaries, marshes, inlets, canals, the Atlantic Ocean, within the territorial seas of the state of New York and all other bodies of surface water, natural or artificial, inland or coastal, fresh or salt, public or private (except those private waters that do not combine or effect a junction with natural surface or underground waters), which are wholly or partially within or bordering the state or within its jurisdiction. Waters of the state are further defined in 6 NYCRR Parts 800-941. Temporary Stabilization — means that exposed soil has been covered with material(s) as set forth in the technical standard, New York Standards and Specifications for Erosion and Sediment Control, to prevent the exposed soil from eroding. The materials can include, but are not limited to, mulch, seed and mulch, and erosion control mats (e.g. jute twisted yarn, excelsior wood fiber mats). Trained Contractor— means an employee from a contracting (construction) company responsible for the day to day implementation of the SWPPP. The trained contractor must have received 4 hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other The LA GROUP Page 23 Stormwater Pollution Prevention Plan Skidmore College Athletic Expansion The LA Group Project # 2016098 Department endorsed entity. After receiving the initial training, the qualified inspector shall receive 4 hours of training every 3 years. It can also mean an employee from the contracting (construction) company that meets the qualified inspector qualifications (e.g. licensed Professional Engineer, Certified Professional in Erosion and Sediment Control (CPESC), Registered Landscape Architect, or someone working under the direct supervision of, and at the same company as, the licensed Professional Engineer or Registered Landscape Architect, provided they have received 4 hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation District, or other Department endorsed entity. G:\Proj-2016\2016098_Skidmore_College Athletic_Expansion\2016098 Enviro\02SWPPP\2016098_SWPPP.docx The LA GROUP Page 24 Appendix A Notice of Intent (NOI) and MS4 Acceptance Form 11/25/2019 NYSDEC eBusiness Portal System-View Submission Details Owner/Operator Information Owner/Operator Name(Company/Private Owner/Municipality/Agency/Institution,etc.) Skidmore College Owner/Operator Contact Person Last Name(NOT CONSULTANT) Rodecker Owner/Operator Contact Person First Name Dan Owner/Operator Mailing Address 815 North Broadway City Saratoga Springs State NY Zip 12866 Phone (518)580 5860 x 5874 Email drodecke@skidmore.edu Federal Tax ID NONE PROVIDED Project Location Project/Site Name Skidmore College Athletic Expansion Street Address(Not P.O.Box) 815 N Broadway Side of Street West City/Town/Village(THAT ISSUES BUILDING PERMIT) Saratoga Springs State NY Zip 12866 County SARATOGA DEC Region 5 Name of Nearest Cross Street 4th Street Distance to Nearest Cross Street(Feet) https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 2/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission 530 Project In Relation to Cross Street North Tax Map Numbers Section-Block-Parcel 152-1-3 Tax Map Numbers NONE PROVIDED 1. Coordinates Provide the Geographic Coordinates for the project site.The two methods are:-Navigate to the project location on the map(below)and click to place a marker and obtain the XY coordinates.-The"Find Me"button will provide the lat/long for the person filling out this form.Then pan the map to the correct location and click the map to place a marker and obtain the XY coordinates. Nat1r1r1 crick on the map to get the X,Y coordinates 43.093819679082294,-73.78521563991029 Project Details 2.What is the nature of this project? Redevelopment with increase in impervious area 3. Select the predominant land use for both pre and post development conditions. Pre-Development Existing Landuse Institutional/School Post-Development Future Land Use Institutional/School 3a.If Single Family Subdivision was selected in question 3,enter the number of subdivision lots. NONE PROVIDED 4. In accordance with the larger common plan of development or sale,enter the total project site acreage,the acreage to be disturbed and the future impervious area(acreage)within the disturbed area."'ROUND TO THE NEAREST TENTH OF AN ACRE.*** Total Site Area(acres) 9.8 Total Area to be Disturbed(acres) 7.2 Existing Impervious Area to be Disturbed(acres) 1.4 Future Impervious Area Within Disturbed Area(acres) 2.7 5.Do you plan to disturb more than 5 acres of soil at any one time? No https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 3/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission 6. Indicate the percentage(%)of each Hydrologic Soil Group(HSG)at the site. A(%) 0.0 B(%) 0.0 C(%) 100 D(%) 0.0 7.Is this a phased project? Yes 8. Enter the planned start and end dates of the disturbance activities. Start Date 03/16/2020 End Date 12/18/2020 9.Identify the nearest surface waterbody(ies)to which construction site runoff will discharge. Unnamed stream 9a.Type of waterbody identified in question 9? Stream/Creek Off Site Other Waterbody Type Off Site Description NONE PROVIDED 8k Id"was selected in 9A,how was the wetland identified? NONE PROVIDED 10.Has the surface waterbody(ies in question 9 been identified as a 303(d)segment in Appendix E of GP-0-15-002? No 11.Is this project located in one of the Watersheds identified in Appendix C of GP-0-15-002? No 12.Is the project located in one of the watershed areas associated with AA and AA-S classified waters? No If No, skip question 13. 13.Does this construction activity disturb land with no existing impervious cover and where the Soil Slope Phase is identified as an E or F on the USDA Soil Survey? No If Yes,what is the acreage to be disturbed? NONE PROVIDED 14.Will the project disturb soils within a State regulated wetland or the protected 100 foot adjacent area? No https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 4/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission 15.Does the site runoff enter a separate storm sewer system(including roadside drains,swales,ditches,culverts,etc)? Yes 16.What is the name of the municipality/entity that owns the separate storm sewer system? City of Saratoga Springs 17.Does any runoff from the site enter a sewer classified as a Combined Sewer? No 18.Will future use of this site be an agricultural property as defined by the NYS Agriculture and Markets Law? No 19.Is this property owned by a state authority,state agency,federal government or local government? No 20.Is this a remediation project being done under a Department approved work plan?(i.e.CERCLA,RCRA,Voluntary Cleanup Agreement,etc.) No Required SWPPP Components 21.Has the required Erosion and Sediment Control component of the SWPPP been developed in conformance with the current NYS Standards and Specifications for Erosion and Sediment Control(aka Blue Book)? Yes 22.Does this construction activity require the development of a SWPPP that includes the post-construction stormwater management practice component(i.e.Runoff Reduction,Water Quality and Quantity Control practices/techniques)? Yes If you answered No in question 22, skip question 23 and the Post-construction Criteria and Post-construction SMP Identification sections. 23.Has the post-construction stormwater management practice component of the SWPPP been developed in conformance with the current NYS Stormwater Management Design Manual? Yes 24.The Stormwater Pollution Prevention Plan(SWPPP)was prepared by: Professional Engineer(P.E.) SWPPP Preparer Douglas Heller Contact Name(Last,Space,First) Heller Douglas Mailing Address 40 Long Alley Cit\ Saratoga Springs NY 12866 P (518)587-8100 https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 5/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission dheller@thelagroup.com Download SWPPP Preparer Certification Form Please take the following steps to prepare and upload your preparer certification form:1)Click on the link below to download a blank certification form 2)The certified SWPPP preparer should sign this form 3)Scan the signed form 4)Upload the scanned document Download SWPPP Preparer Certification Form Please upload the SWPPP Preparer Certification-Attachment SWPPP Preparer Cert(signed).pdf Comment: NONE PROVIDED Erosion&Sediment Control Criteria 25.Has a construction sequence schedule for the planned management practices been prepared? Yes 26. Select all of the erosion and sediment control practices that will be employed on the project site: Temporary Structural Construction Road Stabilization Silt Fence Storm Drain Inlet Protection Biotechnical None Vegetative Measures Mulching Seeding Permanent Structural Land Grading Rock Outlet Protection 0 NONE PROVIDED Post-Construction Criteria "IMPORTANT: Completion of Questions 27-39 is not required if response to Question 22 is No. 27.Identify all site planning practices that were used to prepare the final site plan/layout for the project. Preservation of Undisturbed Area 27a.Indicate which of the following soil restoration criteria was used to address the requirements in Section 5.1.6("Soil Restoration")of the Design Manual(2010 version). All disturbed areas will be restored in accordance with the Soil Restoration requirements in Table 5.3 of the Design Manual(see page 5-22). 28.Provide the total Water Quality Volume(WQv)required for this project(based on final site plan/layout).(Acre-feet) 0.215 29. Post-construction SMP Identification https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 6/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission Use the Post-construction SMP Identification section to identify the RR techniques(Area Reduction),RR techniques(Volume Reduction)and Standard SMPs with RRv Capacity that were used to reduce the Total WQv Required(#28).Identify the SMPs to be used by providing the total impervious area that contributes runoff to each technique/practice selected.For the Area Reduction Techniques,provide the total contributing area(includes pervious area)and,if applicable,the total impervious area that contributes runoff to the technique/practice.Note:Redevelopment projects shall use the Post-Construction SMP Identification section to identify the SMPs used to treat and/or reduce the WQv required.If runoff reduction techniques will not be used to reduce the required WQv,skip to question 33a after identifying the SMPs. 30.Indicate the Total RRv provided by the RR techniques(Area/Volume Reduction)and Standard SMPs with RRv capacity identified in question 29. (acre-feet) 0.048 31.Is the Total RRv provided(#30)greater than or equal to the total WQv required(#28)? No If Yes,go to question 36. If No, go to question 32. 32.Provide the Minimum RRv required based on HSG.[Minimum RRv Required=(P)(0.95)(Ai)/12,Ai=(s)(Aic)](acre-feet) 0.035 32a.Is the Total RRv provided(#30)greater than or equal to the Minimum RRv Required(#32)? Yes If Yes,go to question 33. Note: Use the space provided in question#39 to summarize the specific site limitations and justification for not reducing 100%of WQv required(#28).A detailed evaluation of the specific site limitations and justification for not reducing 100%of the WQv required(#28)must also be included in the SWPPP.If No,sizing criteria has not been met;therefore,NOI can not be processed.SWPPP preparer must modify design to meet sizing criteria. 33. SMPs Use the Post-construction SMP Identification section to identify the Standard SMPs and,if applicable,the Alternative SMPs to be used to treat the remaining total WQv(=Total WQv Required in#28-Total RRv Provided in#30).Also,provide the total impervious area that contributes runoff to each practice selected. NOTE:Use the Post-construction SMP Identification section to identify the SMPs used on Redevelopment projects. 33a.Indicate the Total WQv provided(i.e.WQv treated)by the SMPs identified in question#33 and Standard SMPs with RRv Capacity identified in question#29.(acre-feet) 0.168 Note: For the standard SMPs with RRv capacity,the WQv provided by each practice=the WQv calculated using the contributing drainage area to the practice- provided by the practice.(See Table 3.5 in Design Manual) 34.Provide the sum of the Total RRv provided(#30)and the WQv provided(#33a). 0.216 35.Is the sum of the RRv provided(#30)and the WQv provided(#33a)greater than or equal to the total WQv required(#28)? Yes If Yes,go to question 36.If No,sizing criteria has not been met;therefore,NOI can not be processed.SWPPP preparer must modify design to meet sizing criteria. 36. Provide the total Channel Protection Storage Volume(CPv required and provided or select waiver(#36a), if applicable. CPv Required(acre-feet) 0.08 CPv Provided(acre-feet) 0.34 https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 7/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission 36a.The need to provide channel protection has been waived because. Reduction of the total CPv is achieved on site through runoff reduction techniques or infiltration systems. 37. Provide the Overbank Flood (Qp)and Extreme Flood (Qf)control criteria or select waiver(#37a), if applicable. Overbank Flood Control Criteria (Qp) Pre-Development(CFS) 63.64 Post-Development(CFS) 61.89 Total Extreme Flood Control Criteria (Qf) Pre-Development(CFS) 133.98 Post-Development(CFS) 129.87 37a.The need to meet the Qp and Qf criteria has been waived because: 38.Has a long term Operation and Maintenance Plan for the post-construction stormwater management practice(s)been developed? Yes If Yes,Identify the entity responsible for the long term Operation and Maintenance Skidmore College 39.Use this space to summarize the specific site limitations and justification for not reducing 100%of WQv required(#28).(See question#32a)This space can also be used for other pertinent project information. The full WQv is not reduced due to shallow depth to seasonal high groundwater. Post-Construction SMP Identification Runoff Reduction (RR)Techniques, Standard Stormwater Management Practices(SMPs)and Alternative SMPs Identify the Post-construction SMPs to be used by providing the total impervious area that contributes runoff to each technique/practice selected. For the Area Reduction Techniques,provide the total contributing area(includes pervious area)and,if applicable,the total impervious area that contributes runoff to the technique/practice. RR Techniques(Area Reduction) Round to the nearest tenth Total Contributing Acres for Conservation of Natural Area(RR-1) 0.0 Total Contributing Impervious Acres for Conservation of Natural Area(RR-1) 0.0 Total Contributing Acres for Sheetflow to Riparian Buffers/Filter Strips(RR-2) 0.0 Total Contributing Impervious Acres for Sheetflow to Riparian Buffers/Filter Strips(RR-2) 0.0 https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 8/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission Total Contributing Acres for Tree Planting/Tree Pit(RR-3) 0.0 Total Contributing Impervious Acres for Tree Planting/Tree Pit(RR-3) 0.0 Total Contributing Acres for Disconnection of Rooftop Runoff(RR-4) 0.0 RR Techniques(Volume Reduction) Total Contributing Impervious Acres for Disconnection of Rooftop Runoff(RR-4) 0.0 Total Contributing Impervious Acres for Vegetated Swale(RR-5) 0.0 Total Contributing Impervious Acres for Rain Garden(RR-6) 0.0 Total Contributing Impervious Acres for Stormwater Planter(RR-7) 0.0 Total Contributing Impervious Acres for Rain Barrel/Cistern(RR-8) 0.0 Total Contributing Impervious Acres for Porous Pavement(RR-9) 0.0 Total Contributing Impervious Acres for Green Roof(RR-10) 0.0 Standard SMPs with RRv Capacity Total Contributing Impervious Acres for Infiltration Trench(I-1) 0.0 Total Contributing Impervious Acres for Infiltration Basin(1-2) 0.0 Total Contributing Impervious Acres for Dry Well(1-3) 0.0 Total Contributing Impervious Acres for Underground Infiltration System(1-4) 0.0 Total Contributing Impervious Acres for Bioretention(F-5) 1.3 Total Contributing Impervious Acres for Dry Swale(0-1) 0.0 Standard SMPs Total Contributing Impervious Acres for Micropool Extended Detention(P-1) 0.0 Total Contributing Impervious Acres for Wet Pond(P-2) https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 9/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission 0.0 Total Contributing Impervious Acres for Wet Extended Detention(P-3) 0.0 Total Contributing Impervious Acres for Multiple Pond System(P-4) 0.0 Total Contributing Impervious Acres for Pocket Pond(P-5) 0.0 Total Contributing Impervious Acres for Surface Sand Filter(F-1) 0.0 Total Contributing Impervious Acres for Underground Sand Filter(F-2) 0.0 Total Contributing Impervious Acres for Perimeter Sand Filter(F-3) 0.0 Total Contributing Impervious Acres for Organic Filter(F-4) 0.0 Total Contributing Impervious Acres for Shallow Wetland(W-1) 0.0 Total Contributing Impervious Acres for Extended Detention Wetland(W-2) 0.0 Total Contributing Impervious Acres for Pond/Wetland System(W-3) 0.0 Total Contributing Impervious Acres for Pocket Wetland(W-4) 0.0 Total Contributing Impervious Acres for Wet Swale(0-2) 0.0 Alternative SMPs(DO NOT INCLUDE PRACTICES BEING USED FOR PRETREATMENT ONLY) Total Contributing Impervious Area for Hydrodynamic 4.8 Total Contributing Impervious Area for Wet Vault 0.0 Total Contributing Impervious Area for Media Filter 0.0 "Other"Alterrtetive SMP? NONE PROVIDED ig Impervious Area for"Other" NONE PROVIDED Provide the name and manufaturer of the alternative SMPs(i.e. proprietary practice(s))being used for WQv treatment. Note: Redevelopment projects which do not use RR techniques,shall use questions 28, 29, 33 and 33a to provide SMPs used,total WQv required and total WQv provided for the project. Manufacturer of Alternative SMP https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 10/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission Contech Engineered Solution LLC Name of Alternative SMP CDS-8 Other Permits 40.Identify other DEC permits,existing and new,that are required for this project/facility. None If SPDES Multi-Sector GP,then give permit ID NONE PROVIDED If Other,then identify NONE PROVIDED 41.Does this project require a US Army Corps of Engineers Wetland Permit? No If"Yes,"then indicate Size of Impact,in acres,to the nearest tenth NONE PROVIDED 42.If this NOI is being submitted for the purpose of continuing or transferring coverage under a general permit for stormwater runoff from construction activities,please indicate the former SPDES number assigned. NONE PROVIDED MS4 SWPPP Acceptance 43.Is this project subject to the requirements of a regulated,traditional land use control MS4? Yes-Please attach the MS4 Acceptance form below If No, skip question 44 44.Has the"MS4 SWPPP Acceptance"form been signed by the principal executive officer or ranking elected official and submitted along with this NOI? MS4 SWPPP Acceptance Form Download Download form from the link below.Complete,sign,and upload. MS4 SWPPP Acceptance Form MS4 Acceptance Form Upload-Attachment NONE PROVIDED Comment: NONE PROVIDED Owner/Operator Certification Owner/Operator Certification Form Download Download the certification form by clicking the link below.Complete,sign,scan,and upload the form. Owner/Operator Certification Form(PDF,45KB) Upload Owner/Operator Certification Form*-Attachment NONE PROVIDED Comment: NONE PROVIDED https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 11/12 11/25/2019 NYSDEC eBusiness Portal System-View Submission Attachments Date Attachment Name Context 10/28/2019 09:39 AM SWPPP Preparer Cert(signed).pdf v1 -Required SWPPP Components Status History Date User Processing Status None Processing Steps Step Name Assigned To/Completed By Date Completed Form Submitted Deemed Complete Toni Cioffi https://nform-prod.dec.ny.gov/Submission Version/ffdee494-e218-0b3d-e053-6868b386e1 cd 12/12 Appendix B Stormwater Management Report Hydro CAD L114, The LA GROUP 40 Long Alley p 518-587-8100 Saratoga Springs J 518-587-0180 NY 12866 ww.thelagroup.corn Landscape Architecture&Engineering P.C. Stormwater Management Report for: Skidmore College Athletic Expansion at Skidmore College, 815 N Broadway, Saratoga Springs, NY 12866 Saratoga County Owner/Operator(s): Skidmore College 815 N Broadway Saratoga Springs, NY 12866 SWM Report Contact(s): The LA Group, PC 40 Long Alley Saratoga Springs, NY 12866 1-518-587-8100 Project No. 2016098 Preparation Date: November 25, 2019 Stormwater Management Report Skidmore College Athletic Expansion 2016098 Table of Contents 1.0 INTRODUCTION 4 2.0 PROJECT DESCRIPTION 4 2.1 SITE LOCATION 4 2.2 PROJECT DESCRIPTION 4 2.3 SOIL CONDITIONS/SOIL TESTING 4 2.4 CURVE NUMBERS AND RAINFALL DATA 4 3.0 EXISTING CONDITIONS 5 4.0 PROPOSED CONDITIONS 5 5.0 NYSDEC DESIGN CRITERIA 6 5.1 SITE PLANNING TO PRESERVE NATURAL FEATURES 7 5.2 WATER QUALITY VOLUME(WQv) 8 5.3 RUNOFF REDUCTION VOLUME(RRv) 8 5.4 OVERBANK FLOOD(QP)AND EXTREME FLOOD(QF)ATTENUATION 10 6.0 PROPOSED STORMWATER FACILITIES 11 6.1 PRETREATMENT 11 6.2 TREATMENT 11 7.0 POST-CONSTRUCTION MAINTENANCE REQUIREMENTS 11 7.0 REFERENCES 11 Stormwater Management Report Skidmore College Athletic Expansion 2016098 Attachment A Soil Investigations Soil Survey Natural Resource Map B Existing Conditions Watershed Map and HydroCAD Calculations C Proposed Conditions Watershed Map, HydroCAD Calculations D Storm Data Stormwater Management Report Skidmore College Athletic Expansion 2016098 1.0 INTRODUCTION The following is a Stormwater Management Report (SWM Report) developed for the Operator, Skidmore College, for the Skidmore College Athletic Expansion Site, herein referred to as the "Project." It is prepared in accordance with the New York State Department of Environmental Conservation (NYSDEC) Stormwater Management Design Manual, dated January, 2015. The project is a mixture of redevelopment and new development. Any increases in impervious area at the sites have been designed in accordance with Chapter 4 of the NYSDEC Stormwater Management Design Manual and NYSDEC's General Permit(GP-0-15-002)for construction activities. All existing impervious area to be disturbed have been designed in accordance with Chapter 9 of the NYSDEC Stormwater Management Manual. Stormwater calculations were performed utilizing widely accepted engineering methodologies, including TR-55, and the stormwater modeling computer program HydroCAD (version 10.00)produced by HydroCAD Software Solutions, LLC. 2.0 PROJECT DESCRIPTION 2.1 Site Location The Project is located at Skidmore College in Saratoga Springs, Saratoga County, NY 12866. Access to the site is off Perimeter Road. 2.2 Project Description The proposed project includes the construction of a new athletic facility, tennis courts, and sidewalks. The property is currently comprised of grass and two tennis courts to the east of the Williamson Sports Center. The remainder of the proposed site improvements includes landscaping and stormwater controls. The project is considered a new redevelopment project per Chapters 9 of the SWMDM. The Project Site represents the area that will be disturbed as a result of the Project. 2.3 Soil Conditions/Soil Testing According to the Natural Resources Conservation Service (NRCS)Web Soil Survey, the area including and surrounding the Project Site is comprised of Galway Loam. Galway Loam is classified as 'C'. Therefore, the site has been analyzed using 'C' soils. 2.4 Curve Numbers and Rainfall Data Lig The LA GROUP annuaincnnec. , • 4 Stormwater Management Report Skidmore College Athletic Expansion 2016098 The surface cover for the project area is grass and an impervious driveway. The curve numbers utilized in the modeling were assigned based on cover type and HSG soil classification. The design storms used for the pre-development versus post-development comparison were the 1, 10, and 100-year, 24-hour duration, SCS Type II events. The rainfall amounts for these storms are 2.15, 3.75, and 6.20 inches, respectively. 3.0 EXISTING CONDITIONS The Project area existing condition, for which this stormwater management plan is based, consists of grass, woods, and impervious cover. Under the watershed's existing condition, runoff from the site flows offsite to the south (Analysis Point 1 & 2). Analysis Points 1-2 were utilized in comparing all pre- versus post-runoff conditions. Refer to drawing "W-1 Existing Conditions Watershed Map," located in Attachment B for more information. Table 3-1 below provides a summary of the existing conditions peak discharge rates for the Project's watershed. Table 3-1 Existing Conditions Peak Discharge Rates Analysis AP-1 AP-2 Point Design Storm (cfs) (cfs) 10-Year 1.57 62.07 100-Year 3.60 130.38 Refer to Attachment B for more information on the existing conditions watershed modeling. 4.0 PROPOSED CONDITIONS Under the watershed's Proposed Condition, stormwater from the Project will continue to discharge to the same points as in the Existing Condition (Analysis Points 1 & 2). AP-1 represents runoff flowing into the city property to the south. AP-2 represents flow discharging to the existing detention basins to the south of the project area. The total watershed is shown on the drawing "W-2 Proposed Conditions Watershed Map" contained in Attachment C. To meet NYSDEC requirements (see Section 5.0 NYSDEC Design Criteria of this report) bioretention basins, a hydrodynamic separator and an expansion to the existing detention pond have been incorporated into the stormwater management design to mitigate the quality and quantity of stormwater runoff discharged from the Project Site. The LA GROUP annuai�ncnnec. , • 5 Stormwater Management Report Skidmore College Athletic Expansion 2016098 Table 4-1 below provides a summary of the existing conditions versus proposed conditions peak discharge rates for the Project's watershed. Table 4-1 Existing Conditions Versus Proposed Conditions Peak Discharge Rates Analysis AP-1 AP-2 Point Existing Proposed Existing Proposed Design Storm (cfs) (cfs) (cfs) (cfs) 10-Year 1.57 0.97 62.07 60.92 100-Year 3.60 2.00 130.38 127.87 Refer to Attachment C for more information on the proposed conditions watershed modeling. 5.0 NYSDEC DESIGN CRITERIA The New York State Stormwater Management Design Manual, dated January 2015 (The Manual) has been utilized to develop the stormwater management plan. The Manual includes a five-step process that involves site planning and stormwater management practice selection. The five steps include; • Site planning to preserve natural features and reduce impervious cover, • Calculation of the Water Quality Volume (WQv)for the Site, • Incorporation of green infrastructure techniques and standard SMPs with Runoff Reduction Volume (RRv) capacity, • Use of standard SMPs where applicable, to treat the portion of WQv not addressed by green infrastructure techniques and standard SMPs with RRv capacity, and • Design of volume and peak rate control (where required) The approach of the stormwater management plan was to address the stormwater requirements separately. The five steps were reduced to Site Planning to Preserve Natural Features, Water Quality Volume, Runoff Reduction Volume, Channel Protection Volume, and Overbank Flood and Extreme Storm Attenuation, as discussed in the following sections. Attachment D of this report contains detailed calculations for determining and summarizing the required and provided volumes for Water Quality and Runoff Reduction. In general, the required design criteria (WQv and RRv) were calculated for all areas where site disturbance or green infrastructure techniques are proposed. The LA GROUP annuaincnnec. , • 6 Stormwater Management Report Skidmore College Athletic Expansion 2016098 5.1 Site Planning to Preserve Natural Features Within Chapter 3 of The Manual, Table 3.1 Green Infrastructure Planning General Categories and Specific Practices includes a list of planning practices utilized in the planning and design of a project. There are two categories, Preservation of Natural Resources and Reduction of Imperious Cover. Preservation of Natural Resources includes: • Preservation of Undisturbed Areas • Preservation of Buffers • Reduction of Clearing and Grading • Locating Development in Less Sensitive Areas • Open Space Design • Soil Restoration Reduction of Impervious Cover includes: • Roadway Reduction • Sidewalk Reduction • Driveway Reduction • Cul-de-sac Reduction • Building Footprint Reduction • Parking Reduction A Natural Resource Map for Green Infrastructure Planning has been developed which indicates natural resource areas and critical environmental areas to be protected (where feasible). As required in Section 3.6 of The Manual, the map includes (where applicable): • Jurisdictional Wetlands o There are no wetlands located near the project site. • Waterways o No waterways are impacted by the Project. • Wetland Adjacent Area o There are no wetlands located near the project site. • Floodplains o The project is not within the flood plain. • Forest, vegetative cover o Impact to forested area is limited where feasible. • Topography/Steep slopes o There are no steep slopes located throughout the project. • Existing soils, including hydrologic soil groups and soil erodibility The LA GROUP annuaincnneu , • 7 Stormwater Management Report Skidmore College Athletic Expansion 2016098 o See Section 2.3 of this Report. • Drainage Patterns o See Section 3.0 of this Report. • Bedrock/Significant geological features o See Section 2.3 of this Report. 5.2 Water Quality Volume (WQv) The Water Quality Volume (WQv) requirement is designed to improve water quality sizing to capture and treat 90% of the average annual stormwater runoff volumes. The WQv is directly related to the amount of impervious cover created at a site. The following equation is used to determine the water quality storage volume. WQv = (P)(Rv)(A) 12 Where: WQv = Water quality volume (acre/feet) P = 90%Rainfall Event(1.15" Saratoga Springs) Rv = 0.05 + 0.009(I)where I is percent impervious cover A = Site area in acres The required WQv will be provided by three bioretention basins and a hydrodynamic separator designed in accordance with the SWMDM. The total required WQv for the project is 0.215 ac-ft. Refer to Table 5-1 for a summary of the provided water quality volumes for the Project. Table 5-1 Water Quality Volume (WQv) Summary SMP Type Provided (ac-ft) SMP-1 Bioretention Basin 0.094 SMP-2 Bioretention Basin 0.017 SMP-3 Bioretention Basin 0.009 SMP-4 Hydrodynamic Separator 0.096 TOTAL 0.216 Refer to Attachment D for detailed WQv calculations. 5.3 Runoff Reduction Volume (RRv) 8-11 L The LA GROUP 8 annuaincirneu,,, • 8 Stormwater Management Report Skidmore College Athletic Expansion 2016098 Section 4.3 of the Manual states, "Runoff reduction shall be achieved by infiltration, groundwater recharge, reuse, recycle, evaporation/evapotranspiration of 100 percent of the post- development water quality volumes to replicate pre-development hydrology by maintaining pre- construction infiltration, peak runoff flow, discharge volume, as well as minimizing concentrated flow by using runoff control techniques to provide treatment in a distributed manner before runoff reaches the collection system." The stormwater management plan must demonstrate that all green infrastructure planning and design options were evaluated to meet the runoff reduction requirement. The following is a list of green infrastructure practices that were evaluated during design and specific limitations of the site: • 5.3.1 Conservation of Natural Areas o No conservation areas are proposed as part of this project due to lack of sufficient area on-site. • 5.3.2 Sheetflow to Riparian Buffers/Filter Strips o No filter strips are proposed as part of this project due to lack of sufficient area on-site. • 5.3.3 Vegetated Open Swales o Vegetated open swales were not proposed as a part of this project due to lack of sufficient area on-site. • 5.3.4 Tree Planting/Tree Box o Tree plantings have been proposed throughout the site but credit is not taken due to the low RRv credit(<0.001 ac-ft) provided. • 5.3.5 Disconnection of Rooftop Runoff o Rooftop disconnection was not utilized as there is not sufficient receiving area. • 5.3.6 Stream Daylighting o All subsurface storm sewer piping will be daylighted as soon as possible. • 5.3.7 Rain Garden o Rain gardens are typically applied for residential applications. The contributing drainage areas of project components exceed the maximum contributing area of 1,000 sf(for a rain garden), specified in the SWMDM. • 5.3.8 Green Roof o A green roof is not financially feasible. • 5.3.9 Stormwater Planters o Stormwater planters are not proposed as roof area is greater than 15,000 square feet of contributing area. • 5.3.10 Rain Tanks/Cisterns o Rain tanks/cisterns do not have any tangible functionality on this site as there is little potential for reuse. • 5.3.11 Porous Pavement The LA GROUP annuaincnnec. , • 9 Stormwater Management Report Skidmore College Athletic Expansion 2016098 o Porous pavement is not used as a part of the Project due to shallow depth to groundwater. Table 5-2 Runoff Reduction Volume (RRv) Summary SMP Provided (ac-ft) 5.3.1 Conservation of Natural Areas - 5.3.2 Sheetflow to Riparian Buffers/Filter Strips - 5.3.3 Vegetated Open Swales - 5.3.4 Tree Planting/Tree Box - 5.3.5 Disconnection of Rooftop Runoff - 5.3.6 Stream Daylighting - 5.3.7 Rain Garden - 5.3.8 Green Roof - 5.3.9 Stormwater Planters - 5.3.10 Rain Tanks/Cisterns - 5.3.11 Porous Pavement - Bioretention Basin(SMP-1) 0.094 Bioretention Basin(SMP-2) 0.017 Bioretention Basin(SMP-3) 0.009 TOTAL 0.120(ac-ft) Refer to Attachment D for detailed RRv calculations. 5.4 Overbank Flood (Qp) and Extreme Flood (Qf)Attenuation The primary purpose of the Overbank Flood (Qp) control sizing criterion is to prevent an increase in the frequency and magnitude of out-of-bank flooding generated by urban development. It requires storage and attenuation of the 10-year, 24-hour storm to ensure post- development peak discharge rates do not exceed the pre-development condition. The intent of the Extreme Flood (Qf) criteria is to (a) prevent the increased risk of flood damage from large storm events, (b) maintain the boundaries of the pre-development 100-year floodplain, and (c)protect the physical integrity of stormwater management practices. It requires storage and attenuation of the 100-year, 24-hour storm to ensure post-development peak discharge rates do not exceed the pre-development condition. The LA GROUP annuaincnneu , • 10 Stormwater Management Report Skidmore College Athletic Expansion 2016098 During the 10-year and 100-year 24-hour storm the post-development peak discharge rates do not exceed the pre-development rates. See Table 4-1 of this Report for detailed comparison of pre- and post-development peak rates. 6.0 PROPOSED STORMWATER FACILITIES The Project is proposing the installation of three bioretention basins and the use of one Contech CDS-8 hydrodynamic separator to address stormwater requirements for the project. The stormwater facilities have been indicated on the plans and HydroCAD reports as SMP-1, SMP-2, SMP-3 and SMP-4. 6.1 Pretreatment Pretreatment of runoff to SMP-1 is provided by a forebay. Pretreatment for SMP-2 and SMP-3 is provided by vegetated filter strips. All pretreatment practices are designed in accordance to the SWMDM. 6.2 Treatment Treatment for runoff is provided by capturing and treating the entire WQv though infiltration through planting soils in the bioretention basins and treating WQv through the swirl chamber of the hydrodynamic separator. 7.0 POST-CONSTRUCTION MAINTENANCE REQUIREMENTS Skidmore College will be responsible for the continuous upkeep and maintenance of all stormwater management facilities. Maintenance includes, but is not limited to, cleaning of sediment from drainage inlet sumps, removal of sediment from SMPs, cleaning conveyance piping and channels of obstructions, inspection and repair as required of any outlet control mechanisms, and repairing any other detriments in the design that is resulting in the facilities to not function as intended in the design. 7.0 REFERENCES 1. Urban Hydrology for Small Watersheds. Published by the U.S. Soil Conservation Service, Washington, D.C., June 1986. 2. HydroCAD 10.00 Computer Program, by HydroCAD Software Solutions, LLC. 3. NYSDEC Stormwater Management Design Manual. Published by the New York State Department of Environmental Conservation, Updated January 2015. The LA GROUP annuaincnneu , • 11 Attachment A Soil Investigations Soil Survey Natural Resource Map USDA United States A product of the National Custom Soil Resource Department of Cooperative Soil Survey, Agriculture a joint effort of the United Report for ` ��� States Department of Agriculture and other S a rato g a Federal agencies, State Natural agencies including the Resources Agricultural Experiment C o u n ty7 New Conservation Stations, and local Service participants York ,. „,„,„,- i ' ,. „rippwsr \ ..„ / , . 4,,, -, -..,.. , /y - r, , .J, , .x . , „„ /..„ , .„. kht. i-I i ' ,f4'. 4 IP r : - ,t I J d° ' � *, :' ' ,,, .', 6 f• °qtr f, r C r4 � c Df i ':iN,,, t3 ::"1/45 ''' : 4-417:1 _,,,..,....11:: '.\ .01P41„,nr . .. -,,,,,,.,....N.i m l '',""" ,r,• :, — , 000 ft � : .. , �' :, ■uwu ■ s>. - i *A October 9, 2019 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nrcs/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or(202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Saratoga County, New York 13 GaB—Galway loam, 3 to 8 percent slopes 13 References 15 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil-landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. 7 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 Custom Soil Resource Report Soil Map r4 598500 598600 598700 598800 593900 599000 599100 43°5 59"N M _, I 2 43°5 59"N v -. v , ": .. ...."w447 le CP \\e � re M A. t el a 4. - . • Y r / ' \ we ' r M .. ,. ^gee * R ��.;. w' L k' 4 1 ' 't x w ,gyp+, C s e Center ? a 4 w y� ii: . i \\ 1\ F.00 g v i N r . a 3 G 3 . Thira'Sf A i N v r I,El ,Ey noit[be wend ail ill-do amOQ° r°~ +�,.4 '' 43°5 31"N 43°5 31"N 598600 598700 598800 598900 599000 599100 Map Scale:1:4,230 if printed on A portrait(8.5"x 11")sheet. Meters N 0 50 100 200 330 Feet A 0 Z00 400 800 1200 Map projection:Web Mercator Comerworrdinates:WGS84 Edge tics:UTM Zane 18N WGS84 9 cn w• F3 w w (o w 0 a`) -0 CO o w w w (6 2 -6 w I > C O (o O >, o Q U 2 0 o N N w 3 -6 O w CO w N N 0 2 O E w U co co 0 E O w -6 w _ -6 f—. 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J = y -O a 0 O ° oU O O N a o aQ Z CL E > co mc a y ce o a m o N o Tr!, g a U n O o( oi > O ( a cc) co J R v La-) C 0 is r O O tt H 2 W + R t R *K Y CD it csm W J y O. p y o a o gCO a• ° a° N o 0 2 wwwy 2 Q N N( N Q -O O C C C aQ 0 O Oo o 2 0- ._ • E > > > 7 , O U w om w w o O aQ aQ aQ R a Q aa >, O o m = cc ' ` ao y 3 -o Li_ o E O O o o - LL 3 O w > > Y o aT aCtaO 0 0 8 yd '0 '0 '0E. O ` ' O N N N Cf/) OO t acO -0O < co co co o m m 0 0 C) 0 J - o_ ce co co co in in co a) a Ta ■ y a (0 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI GaB Galway loam,3 to 8 percent 62.8 100.0% slopes Totals for Area of Interest 62.8 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. 11 Custom Soil Resource Report An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Saratoga County, New York GaB—Galway loam, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 9wb1 Elevation: 150 to 1,000 feet Mean annual precipitation: 36 to 48 inches Mean annual air temperature: 45 to 48 degrees F Frost-free period: 125 to 160 days Farmland classification: All areas are prime farmland Map Unit Composition Galway and similar soils: 65 percent Minor components: 35 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Galway Setting Landform: Benches, ridges, till plains Landform position (two-dimensional): Summit Landform position (three-dimensional): Crest Down-slope shape: Concave Across-slope shape: Convex Parent material: Calcareous loamy till Typical profile H1 -0 to 6 inches: loam H2- 6 to 28 inches: loam BC-28 to 30 inches: fine sandy loam 2R-30 to 40 inches: unweathered bedrock Properties and qualities Slope: 3 to 8 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Natural drainage class: Moderately well drained Capacity of the most limiting layer to transmit water(Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: About 18 to 36 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 5 percent Available water storage in profile: Low (about 4.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: C Hydric soil rating: No Minor Components Charlton Percent of map unit: 15 percent Hydric soil rating: No 13 Custom Soil Resource Report Newstead Percent of map unit: 10 percent Hydric soil rating: No Farmington Percent of map unit: 10 percent Hydric soil rating: No 14 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/ nres/detail/national/soils/?cid=nres 142 p2_0 54262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ home/?cid=nres142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stelprdb1043084 15 Custom Soil Resource Report United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/ n res/deta i l/so i is/scie ntists/?cid=nres 142 p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/I nternet/FSE_DOCU M ENTS/n res142p2_052290.pdf 16 Attachment B Existing Conditions Watershed Map and HydroCAD Calculations 0_ C JOS o g ofcllO 6 ''.. 1 M C9 €. O 1j b. J. IR ,..t' t o N o an u poOM I A� 4. fig ! � �, 7 O r _ CD $\W4.. N, i k... ...---'1 '1-----''''-f-`t4..,,H 1 r,•...:'' 1 1 ,-----_-.-- ,-.km 0,,. \. ,,. -iit,-,,.- •---._:„114N .-14.1 1,.,:,,t. i;\.,. 7 ittia\1/4« . \e itt vor-IL%".--\'-i-. ''\ �� \s. <',7f1 ,:- \`I ) \® tp' „c+eav/ati - i--: 't\K,'le„ '''', ,'®\ -..��� 3 _� rag -4'. lV r- � ` ,.. "vim ',.. o. -!tot lo,m,p,C, ."`"-I,..,.... o—1 vtro 1 '\ o, -,. .....„....V.,-,,,k. a �� c Lfi �. \ * ^• 4 , 8 __ , , a „,,,,,\.-;t:, ,.7-00 _ \\.,„ \\A ,A., -, ,, iltq ONO • 8 t, ii A.����iS�w$ E iia tl:/ X33 amu, co co oa cv r �+° a� � O Z � 0_ = x.x W Cr) .. 0- , t y CD cm 0:5 °2 711 CD O U � ip O ,:.;1;1',0101,0"-:‘,6104V, & a'a` rte. p i 1-2 -- 111 Sub)at 1 0 P10 Subcat 2 Existing North Pond Subcat 1.1 A Si] 18" Pipe N Pond to Outlet O O AcB 0 OUTLET 24" Pipe Subcat 3 O let StreamIPond \ \ cB CB-3 S2 \\ 4 \ \ 24" Pipe Outlet to Inl t from Pond \ Subcat 4 4 A S3 Q P2 Storm MH Inlet from P nd to AP-2 Existing Retention Pond 0 Subcat 5 AP-1 AP-2 AP-1 AP-2 Subcat Reach 'on• Link Routing Diagram for PRE-DEV Prepared by The LA Group, Printed 11/25/2019 HydroCAD®10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC PRE-DEV Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 18.547 74 >75% Grass cover, Good, HSG C (1, 1.1, 2, 3, 4, 5) 10.936 98 Paved parking, HSG C (1, 1.1, 2, 3, 5) 1.492 70 Woods, Good, HSG C (3, 5) 30.974 82 TOTAL AREA PRE-DEV Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 30.974 HSG C 1, 1.1, 2, 3, 4, 5 0.000 HSG D 0.000 Other 30.974 TOTAL AREA PRE-DEV Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 18.547 0.000 0.000 18.547 >75% Grass cover, Good 1, 1.1, 2, 3, 4, 5 0.000 0.000 10.936 0.000 0.000 10.936 Paved parking 1, 1.1, 2, 3, 5 0.000 0.000 1.492 0.000 0.000 1.492 Woods, Good 3, 5 0.000 0.000 30.974 0.000 0.000 30.974 TOTAL AREA PRE-DEV Type II 24-hr 1YR Rainfall=2.15" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 5 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 1: Subcat 1 Runoff Area=10.347 ac 22.57% Impervious Runoff Depth>0.55" Flow Length=820' Slope=0.0600 '1 Tc=11.4 min CN=79 Runoff=8.74 cfs 0.472 af Subcatchment 1.1: Subcat 1.1 Runoff Area=7.700 ac 29.99% Impervious Runoff Depth>0.63" Tc=6.0 min CN=81 Runoff=9.32 cfs 0.406 af Subcatchment2: Subcat 2 Runoff Area=6.831 ac 64.52% Impervious Runoff Depth>1.07" Tc=6.0 min CN=89 Runoff=13.52 cfs 0.606 af Subcatchment3: Subcat 3 Runoff Area=5.132 ac 35.32% Impervious Runoff Depth>0.63" Flow Length=430' Tc=14.5 min CN=81 Runoff=4.51 cfs 0.270 af Subcatchment4: Subcat4 Runoff Area=0.256 ac 0.00% Impervious Runoff Depth>0.37" Tc=6.0 min CN=74 Runoff=0.17 cfs 0.008 af Subcatchment5: Subcat5 Runoff Area=0.708 ac 10.04% Impervious Runoff Depth>0.44" Flow Length=156' Tc=11.6 min CN=76 Runoff=0.45 cfs 0.026 af Reach S1: N Pond to Outlet Avg. Flow Depth=0.49' Max Vel=3.05 fps Inflow=9.79 cfs 0.842 af n=0.030 L=724.0' S=0.0124 '/' Capacity=419.15 cfs Outflow=8.66 cfs 0.836 af Reach S2: Outlet to Inlet from Pond Avg. Flow Depth=0.71' Max Vel=2.96 fps Inflow=12.78 cfs 1.105 af n=0.030 L=262.0' S=0.0076 '/' Capacity=526.29 cfs Outflow=12.67 cfs 1.102 of Reach S3: Inlet from Pond to AP-2 Avg. Flow Depth=0.63' Max Vel=3.33 fps Inflow=12.80 cfs 1.110 af n=0.030 L=272.0' S=0.0110 '1 Capacity=632.61 cfs Outflow=12.66 cfs 1.108 af Pond CB-1: 18" Pipe Peak Elev=387.67' Inflow=13.52 cfs 0.606 af 18.0" Round Culvert n=0.012 L=147.0' S=0.0123 '1 Outflow=13.52 cfs 0.606 af Pond CB-2: 24" Pipe Peak Elev=384.56' Inflow=13.52 cfs 0.606 af 24.0" Round Culvert n=0.012 L=72.0' S=0.0060 '1 Outflow=13.52 cfs 0.606 af Pond CB-3: 24" Pipe Peak Elev=383.97' Inflow=13.52 cfs 0.606 af 24.0" Round Culvert n=0.012 L=234.0' S=0.0041 '1 Outflow=13.52 cfs 0.606 af Pond DMH: Storm MH Peak Elev=382.74' Inflow=13.52 cfs 0.606 af 24.0" Round Culvert n=0.012 L=95.0' S=0.0058 '1 Outflow=13.52 cfs 0.606 af Pond OUTLET: Outlet Stream/Pond Peak Elev=389.75' Inflow=8.66 cfs 0.836 af Primary=8.64 cfs 0.836 af Secondary=0.03 cfs 0.000 af Outflow=8.66 cfs 0.836 af Pond P1: Existing North Pond Peak EIev=401.32' Storage=46.747 cf Inflow=8.74 cfs 0.472 af Outflow=2.18 cfs 0.436 af Pond P2: Existing Retention Pond Peak EIev=387.00' Storage=0 cf Inflow=0.20 cfs 0.008 af 12.0" Round Culvert n=0.012 L=51.0' S=0.0186 '1 Outflow=0.20 cfs 0.008 af PRE-DEV Type II 24-hr 1YR Rainfall=2.15" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 6 Link AP-1: AP-1 Inflow=0.45 cfs 0.026 af Primary=0.45 cfs 0.026 af Link AP-2: AP-2 Inflow=22.71 cfs 1.714 af Primary=22.71 cfs 1.714 af Total Runoff Area = 30.974 ac Runoff Volume = 1.788 af Average Runoff Depth = 0.69" 64.69% Pervious = 20.039 ac 35.31% Impervious = 10.936 ac PRE-DEV Type II 24-hr 10YR Rainfall=3.75" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 7 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment1: Subcat 1 Runoff Area=10.347 ac 22.57% Impervious Runoff Depth>1.61" Flow Length=820' Slope=0.0600 '1 Tc=11.4 min CN=79 Runoff=26.39 cfs 1.392 af Subcatchment 1.1: Subcat 1.1 Runoff Area=7.700 ac 29.99% Impervious Runoff Depth>1.76" Tc=6.0 min CN=81 Runoff=25.34 cfs 1.131 af Subcatchment2: Subcat 2 Runoff Area=6.831 ac 64.52% Impervious Runoff Depth>2.42" Tc=6.0 min CN=89 Runoff=29.42 cfs 1.377 af Subcatchment3: Subcat 3 Runoff Area=5.132 ac 35.32% Impervious Runoff Depth>1.76" Flow Length=430' Tc=14.5 min CN=81 Runoff=12.82 cfs 0.751 af Subcatchment4: Subcat4 Runoff Area=0.256 ac 0.00% Impervious Runoff Depth>1.29" Tc=6.0 min CN=74 Runoff=0.63 cfs 0.027 af Subcatchment5: Subcat 5 Runoff Area=0.708 ac 10.04% Impervious Runoff Depth>1.41" Flow Length=156' Tc=11.6 min CN=76 Runoff=1.57 cfs 0.083 af Reach S1: N Pond to Outlet Avg. Flow Depth=0.98' Max Vel=4.51 fps Inflow=30.11 cfs 2.462 af n=0.030 L=724.0' S=0.0124 '1 Capacity=419.15 cfs Outflow=28.48 cfs 2.452 af Reach S2: Outlet to Inlet from Pond Avg. Flow Depth=1.30' Max Vel=4.13 fps Inflow=37.40 cfs 3.146 af n=0.030 L=262.0' S=0.0076 '1 Capacity=526.29 cfs Outflow=37.36 cfs 3.141 af Reach S3: Inlet from Pond to AP-2 Avg. Flow Depth=1.21' Max Vel=4.77 fps Inflow=39.23 cfs 3.226 af n=0.030 L=272.0' S=0.0110 '1 Capacity=632.61 cfs Outflow=39.13 cfs 3.221 af Pond CB-1: 18" Pipe Peak EIev=404.54' Inflow=29.42 cfs 1.377 af 18.0" Round Culvert n=0.012 L=147.0' S=0.0123 '1 Outflow=29.42 cfs 1.377 af Pond CB-2: 24" Pipe Peak EIev=392.93' Inflow=29.42 cfs 1.377 af 24.0" Round Culvert n=0.012 L=72.0' S=0.0060 '1 Outflow=29.42 cfs 1.377 af Pond CB-3: 24" Pipe Peak EIev=390.51' Inflow=29.42 cfs 1.377 af 24.0" Round Culvert n=0.012 L=234.0' S=0.0041 '1 Outflow=29.42 cfs 1.377 af Pond DMH: Storm MH Peak EIev=385.62' Inflow=29.42 cfs 1.377 af 24.0" Round Culvert n=0.012 L=95.0' S=0.0058 '1 Outflow=29.42 cfs 1.377 af Pond OUTLET: Outlet Stream/Pond Peak EIev=390.57' Inflow=28.48 cfs 2.452 af Primary=25.79 cfs 2.394 af Secondary=2.70 cfs 0.057 af Outflow=28.48 cfs 2.452 af Pond P1: Existing North Pond Peak EIev=401.88' Storage=60.087 cf Inflow=26.39 cfs 1.392 af Outflow=11.03 cfs 1.331 af Pond P2: Existing Retention Pond Peak EIev=387.22' Storage=674 cf Inflow=3.27 cfs 0.085 af 12.0" Round Culvert n=0.012 L=51.0' S=0.0186 '1 Outflow=1.98 cfs 0.085 af PRE-DEV Type II 24-hr 10YR Rainfall=3.75" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 8 Link AP-1: AP-1 Inflow=1.57 cfs 0.083 af Primary=1.57 cfs 0.083 af Link AP-2: AP-2 Inflow=62.07 cfs 4.598 af Primary=62.07 cfs 4.598 af Total Runoff Area = 30.974 ac Runoff Volume = 4.763 af Average Runoff Depth = 1.85" 64.69% Pervious = 20.039 ac 35.31% Impervious = 10.936 ac PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 1 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 1: Subcat 1 Runoff Area=10.347 ac 22.57% Impervious Runoff Depth>3.58" Flow Length=820' Slope=0.0600 '1 Tc=11.4 min CN=79 Runoff=57.15 cfs 3.088 af Subcatchment 1.1: Subcat 1.1 Runoff Area=7.700 ac 29.99% Impervious Runoff Depth>3.79" Tc=6.0 min CN=81 Runoff=52.57 cfs 2.432 af Subcatchment2: Subcat 2 Runoff Area=6.831 ac 64.52% Impervious Runoff Depth>4.62" Tc=6.0 min CN=89 Runoff=53.91 cfs 2.632 af Subcatchment3: Subcat 3 Runoff Area=5.132 ac 35.32% Impervious Runoff Depth>3.78" Flow Length=430' Tc=14.5 min CN=81 Runoff=26.96 cfs 1.616 af Subcatchment4: Subcat4 Runoff Area=0.256 ac 0.00% Impervious Runoff Depth>3.10" Tc=6.0 min CN=74 Runoff=1.47 cfs 0.066 af Subcatchment5: Subcat5 Runoff Area=0.708 ac 10.04% Impervious Runoff Depth>3.29" Flow Length=156' Tc=11.6 min CN=76 Runoff=3.60 cfs 0.194 af Reach S1: N Pond to Outlet Avg. Flow Depth=1.55' Max Vel=5.78 fps Inflow=67.79 cfs 5.428 af n=0.030 L=724.0' S=0.0124 '1 Capacity=419.15 cfs Outflow=65.71 cfs 5.413 af Reach S2: Outlet to Inlet from Pond Avg. Flow Depth=2.00' Max Vel=5.17 fps Inflow=83.43 cfs 6.743 af n=0.030 L=262.0' S=0.0076 '1 Capacity=526.29 cfs Outflow=82.79 cfs 6.735 af Reach S3: Inlet from Pond to AP-2 Avg. Flow Depth=1.86' Max Vel=5.99 fps Inflow=86.44 cfs 7.089 af n=0.030 L=272.0' S=0.0110 '1 Capacity=632.61 cfs Outflow=86.50 cfs 7.082 af Pond CB-1: 18" Pipe Peak Elev=458.12' Inflow=53.91 cfs 2.632 af 18.0" Round Culvert n=0.012 L=147.0' S=0.0123 '1 Outflow=53.91 cfs 2.632 af Pond CB-2: 24" Pipe Peak Elev=418.64' Inflow=53.91 cfs 2.632 af 24.0" Round Culvert n=0.012 L=72.0' S=0.0060 '1 Outflow=53.91 cfs 2.632 af Pond CB-3: 24" Pipe Peak EIev=410.67' Inflow=53.91 cfs 2.632 af 24.0" Round Culvert n=0.012 L=234.0' S=0.0041 '1 Outflow=53.91 cfs 2.632 af Pond DMH: Storm MH Peak EIev=394.42' Inflow=53.91 cfs 2.632 af 24.0" Round Culvert n=0.012 L=95.0' S=0.0058 '1 Outflow=53.91 cfs 2.632 af Pond OUTLET: Outlet Stream/Pond Peak EIev=391.80' Inflow=65.71 cfs 5.413 af Primary=58.76 cfs 5.126 af Secondary=6.96 cfs 0.286 af Outflow=65.71 cfs 5.413 af Pond P1: Existing North Pond Peak EIev=402.69' Storage=80.915 cf Inflow=57.15 cfs 3.088 af Outflow=29.21 cfs 2.996 af Pond P2: Existing Retention Pond Peak EIev=388.18' Storage=4,221 cf Inflow=8.32 cfs 0.353 af 12.0" Round Culvert n=0.012 L=51.0' 8=0.0186 '1 Outflow=4.22 cfs 0.353 af PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 2 Link AP-1: AP-1 Inflow=3.60 cfs 0.194 af Primary=3.60 cfs 0.194 af Link AP-2: AP-2 Inflow=130.38 cfs 9.713 af Primary=130.38 cfs 9.713 af Total Runoff Area = 30.974 ac Runoff Volume = 10.028 af Average Runoff Depth = 3.89" 64.69% Pervious = 20.039 ac 35.31% Impervious = 10.936 ac PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 1: Subcat 1 Runoff = 57.15 cfs @ 12.03 hrs, Volume= 3.088 af, Depth> 3.58" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 8.011 74 >75% Grass cover, Good, HSG C 2.335 98 Paved parking, HSG C 10.347 79 Weighted Average 8.011 77.43% Pervious Area 2.335 22.57% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.4 820 0.0600 1.20 Lag/CN Method, Summary for Subcatchment 1.1: Subcat 1.1 Runoff = 52.57 cfs @ 11.97 hrs, Volume= 2.432 af, Depth> 3.79" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 5.391 74 >75% Grass cover, Good, HSG C 2.310 98 Paved parking, HSG C 7.700 81 Weighted Average 5.391 70.01% Pervious Area 2.310 29.99% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2: Subcat 2 Runoff = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af, Depth> 4.62" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 2.424 74 >75% Grass cover, Good, HSG C 4.407 98 Paved parking, HSG C 6.831 89 Weighted Average 2.424 35.48% Pervious Area 4.407 64.52% Impervious Area PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 4 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 3: Subcat 3 Runoff = 26.96 cfs @ 12.06 hrs, Volume= 1.616 af, Depth> 3.78" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 1.873 74 >75% Grass cover, Good, HSG C 1.813 98 Paved parking, HSG C 1.446 70 Woods, Good, HSG C 5.132 81 Weighted Average 3.319 64.68% Pervious Area 1.813 35.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.2 100 0.0150 0.14 Sheet Flow, Grass: Short n= 0.150 P2= 2.60" 2.3 330 0.0250 2.37 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 14.5 430 Total Summary for Subcatchment 4: Subcat 4 Runoff = 1.47 cfs @ 11.97 hrs, Volume= 0.066 af, Depth> 3.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.256 74 >75% Grass cover, Good, HSG C 0.256 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 5: Subcat 5 Runoff = 3.60 cfs @ 12.03 hrs, Volume= 0.194 af, Depth> 3.29" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 5 Area (ac) CN Description 0.591 74 >75% Grass cover, Good, HSG C 0.071 98 Paved parking, HSG C 0.046 70 Woods, Good, HSG C 0.708 76 Weighted Average 0.637 89.96% Pervious Area 0.071 10.04% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.0 80 0.0125 0.12 Sheet Flow, Grass: Short n= 0.150 P2= 2.60" 0.6 76 0.1050 2.27 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 11.6 156 Total Summary for Reach S1: N Pond to Outlet Inflow Area = 18.047 ac, 25.74% Impervious, Inflow Depth > 3.61" for 100YR event Inflow = 67.79 cfs @ 11.98 hrs, Volume= 5.428 af Outflow = 65.71 cfs @ 12.01 hrs, Volume= 5.413 af, Atten= 3%, Lag= 1.4 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 5.78 fps, Min. Travel Time= 2.1 min Avg. Velocity = 1.93 fps, Avg. Travel Time= 6.3 min Peak Storage= 8,222 cf @ 12.01 hrs Average Depth at Peak Storage= 1.55' Bank-Full Depth= 4.00' Flow Area= 44.0 sf, Capacity= 419.15 cfs 5.00' x 4.00' deep channel, n= 0.030 Stream, clean & straight Side Slope Z-value= 1.5 '/' Top Width= 17.00' Length= 724.0' Slope= 0.0124 '/' Inlet Invert= 399.00', Outlet Invert= 390.00' Summary for Reach S2: Outlet to Inlet from Pond Inflow Area = 23.179 ac, 27.86% Impervious, Inflow Depth > 3.49" for 100YR event Inflow = 83.43 cfs @ 12.02 hrs, Volume= 6.743 af Outflow = 82.79 cfs @ 12.03 hrs, Volume= 6.735 af, Atten= 1%, Lag= 0.8 min PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 6 Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 5.17 fps, Min. Travel Time= 0.8 min Avg. Velocity = 1.80 fps, Avg. Travel Time= 2.4 min Peak Storage= 4,188 cf @ 12.03 hrs Average Depth at Peak Storage= 2.00' Bank-Full Depth= 5.00' Flow Area= 62.5 sf, Capacity= 526.29 cfs 5.00' x 5.00' deep channel, n= 0.030 Stream, clean & straight Side Slope Z-value= 1.5 '/' Top Width= 20.00' Length= 262.0' Slope= 0.0076 '/' Inlet Invert= 388.00', Outlet Invert= 386.00' Summary for Reach S3: Inlet from Pond to AP-2 Inflow Area = 23.435 ac, 27.55% Impervious, Inflow Depth > 3.63" for 100YR event Inflow = 86.44 cfs @ 12.04 hrs, Volume= 7.089 af Outflow = 86.50 cfs @ 12.05 hrs, Volume= 7.082 af, Atten= 0%, Lag= 0.6 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 5.99 fps, Min. Travel Time= 0.8 min Avg. Velocity = 2.05 fps, Avg. Travel Time= 2.2 min Peak Storage= 3,928 cf @ 12.05 hrs Average Depth at Peak Storage= 1.86' Bank-Full Depth= 5.00' Flow Area= 62.5 sf, Capacity= 632.61 cfs 5.00' x 5.00' deep channel, n= 0.030 Stream, clean & straight Side Slope Z-value= 1.5 '/' Top Width= 20.00' Length= 272.0' Slope= 0.0110 '/' Inlet Invert= 385.00', Outlet Invert= 382.00' PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 7 Summary for Pond CB-1: 18" Pipe Inflow Area = 6.831 ac, 64.52% Impervious, Inflow Depth > 4.62" for 100YR event Inflow = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af Outflow = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af, Atten= 0%, Lag= 0.0 min Primary = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 458.12' @ 11.99 hrs Device Routing Invert Outlet Devices #1 Primary 384.27' 18.0" Round Culvert L= 147.0' Ke= 0.500 Inlet/ Outlet Invert= 384.27' / 382.46' S= 0.0123 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 1.77 sf Primary OutFlow Max=46.69 cfs @ 11.96 hrs HW=453.13' TW=412.03' (Dynamic Tailwater) 4-1=Culvert (Outlet Controls 46.69 cfs @ 26.42 fps) Summary for Pond CB-2: 24" Pipe Inflow Area = 6.831 ac, 64.52% Impervious, Inflow Depth > 4.62" for 100YR event Inflow = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af Outflow = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af, Atten= 0%, Lag= 0.0 min Primary = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 418.64' @ 12.01 hrs Device Routing Invert Outlet Devices #1 Primary 382.36' 24.0" Round Culvert L= 72.0' Ke= 0.500 Inlet/ Outlet Invert= 382.36' / 381.93' S= 0.0060 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=29.87 cfs @ 11.96 hrs HW=412.03' TW=408.13' (Dynamic Tailwater) L1=Culvert (Inlet Controls 29.87 cfs @ 9.51 fps) Summary for Pond CB-3: 24" Pipe Inflow Area = 6.831 ac, 64.52% Impervious, Inflow Depth > 4.62" for 100YR event Inflow = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af Outflow = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af, Atten= 0%, Lag= 0.0 min Primary = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 410.67' @ 11.98 hrs Device Routing Invert Outlet Devices #1 Primary 381.83' 24.0" Round Culvert L= 234.0' Ke= 0.500 Inlet/ Outlet Invert= 381.83' / 380.87' S= 0.0041 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 8 Primary OutFlow Max=47.80 cfs @ 11.96 hrs HW=408.13' TW=393.81' (Dynamic Tailwater) L1=Culvert (Outlet Controls 47.80 cfs @ 15.21 fps) Summary for Pond DMH: Storm MH Inflow Area = 6.831 ac, 64.52% Impervious, Inflow Depth > 4.62" for 100YR event Inflow = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af Outflow = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af, Atten= 0%, Lag= 0.0 min Primary = 53.91 cfs @ 11.96 hrs, Volume= 2.632 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 394.42' @ 11.96 hrs Device Routing Invert Outlet Devices #1 Primary 380.77' 24.0" Round Culvert L= 95.0' Ke= 0.500 Inlet/ Outlet Invert= 380.77' / 380.22' S= 0.0058 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=52.49 cfs @ 11.96 hrs HW=393.81' TW=0.00' (Dynamic Tailwater) 4-1=Culvert (Inlet Controls 52.49 cfs @ 16.71 fps) Summary for Pond OUTLET: Outlet Stream/Pond Inflow Area = 18.047 ac, 25.74% Impervious, Inflow Depth > 3.60" for 100YR event Inflow = 65.71 cfs @ 12.01 hrs, Volume= 5.413 af Outflow = 65.71 cfs @ 12.01 hrs, Volume= 5.413 af, Atten= 0%, Lag= 0.0 min Primary = 58.76 cfs @ 12.01 hrs, Volume= 5.126 af Secondary = 6.96 cfs @ 12.02 hrs, Volume= 0.286 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 391.80' @ 12.01 hrs Device Routing Invert Outlet Devices #1 Primary 389.00' 5.0' long x 5.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 #2 Secondary 389.65' 15.0" Round Culvert L= 50.0' Ke= 0.500 Inlet/ Outlet Invert= 389.65' / 389.31' S= 0.0068 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 1.23 sf Primary OutFlow Max=56.33 cfs @ 12.01 hrs HW=391.77' TW=389.96' (Dynamic Tailwater) 4-1=Broad-Crested Rectangular Weir(Weir Controls 56.33 cfs @ 4.06 fps) Secondary OutFlow Max=6.83 cfs @ 12.02 hrs HW=391.76' TW=387.78' (Dynamic Tailwater) L2=Culvert (Barrel Controls 6.83 cfs @ 5.57 fps) PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 9 Summary for Pond P1: Existing North Pond Inflow Area = 10.347 ac, 22.57% Impervious, Inflow Depth > 3.58" for 100YR event Inflow = 57.15 cfs @ 12.03 hrs, Volume= 3.088 af Outflow = 29.21 cfs @ 12.16 hrs, Volume= 2.996 af, Atten= 49%, Lag= 8.1 min Primary = 29.21 cfs @ 12.16 hrs, Volume= 2.996 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Starting Elev= 401.00' Surf.Area= 22,263 sf Storage= 39,555 cf Peak Elev= 402.69' @ 12.16 hrs Surf.Area= 26,606 sf Storage= 80,915 cf (41,360 cf above start) Plug-Flow detention time= 137.9 min calculated for 2.088 af(68% of inflow) Center-of-Mass det. time= 27.8 min ( 805.9 - 778.1 ) Volume Invert Avail.Storage Storage Description #1 399.00' 117,925 cf Custom Stage Data (Irregular)Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 399.00 17,348 799.0 0 0 17,348 400.00 19,775 819.0 18,548 18,548 20,047 401.00 22,263 839.0 21,007 39,555 22,813 402.00 24,812 859.0 23,526 63,081 25,646 403.00 27,418 878.0 26,104 89,185 28,412 404.00 30,082 897.0 28,740 117,925 31,239 Device Routing Invert Outlet Devices #1 Primary 401.00' 5.0' long x 5.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 Primary OutFlow Max=28.98 cfs @ 12.16 hrs HW=402.68' TW=400.19' (Dynamic Tailwater) 4-1=Broad-Crested Rectangular Weir(Weir Controls 28.98 cfs @ 3.44 fps) Summary for Pond P2: Existing Retention Pond Inflow Area = 0.256 ac, 0.00% Impervious, Inflow Depth > 16.51" for 100YR event Inflow = 8.32 cfs @ 12.00 hrs, Volume= 0.353 af Outflow = 4.22 cfs @ 12.25 hrs, Volume= 0.353 af, Atten= 49%, Lag= 15.1 min Primary = 4.22 cfs @ 12.25 hrs, Volume= 0.353 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 388.18' @ 12.25 hrs Surf.Area= 4,203 sf Storage= 4,221 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 11.3 min ( 751.9 - 740.7 ) PRE-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 10 Volume Invert Avail.Storage Storage Description #1 387.00' 19,774 cf Custom Stage Data (Irregular)Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 387.00 2,922 268.0 0 0 2,922 388.00 4,041 334.0 3,466 3,466 6,098 389.00 4,964 365.0 4,495 7,961 7,857 390.00 5,904 388.0 5,427 13,388 9,286 391.00 6,879 406.0 6,385 19,774 10,491 Device Routing Invert Outlet Devices #1 Primary 386.44' 12.0" Round Culvert L= 51.0' Ke= 0.500 Inlet/ Outlet Invert= 386.44' / 385.49' S= 0.0186 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=4.21 cfs @ 12.25 hrs HW=388.18' TW=386.36' (Dynamic Tailwater) 4-1=Culvert (Inlet Controls 4.21 cfs @ 5.37 fps) Summary for Link AP-1: AP-1 Inflow Area = 0.708 ac, 10.04% Impervious, Inflow Depth > 3.29" for 100YR event Inflow = 3.60 cfs @ 12.03 hrs, Volume= 0.194 af Primary = 3.60 cfs @ 12.03 hrs, Volume= 0.194 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Link AP-2: AP-2 Inflow Area = 30.266 ac, 35.90% Impervious, Inflow Depth > 3.85" for 100YR event Inflow = 130.38 cfs @ 12.00 hrs, Volume= 9.713 af Primary = 130.38 cfs @ 12.00 hrs, Volume= 9.713 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Attachment C Proposed Conditions Watershed Map, HydroCAD Calculations a 9I E °1 Q 0s o a.) -i > I-' N 0 ti 20 TMM� ,,s 5,1++ ,,i 1 N _.1,,),,,:„, cs, Q mo\ -` Il1I I `sr ,' . 4 . ' II _ (-); y • ; D o, � yl i ) I,e } I !I'l� A� ' Q HIiV \l I \ n 1 ,pz.:7.-,,, �� \kll i • el Ate • / 7111"1"111.1111111' I-/// ,6r 11 ! ,'4 , � _ � 1q 0 ,...;,, ,ii 94 a ® E co n ODo f( � ,_ —\ u CO Z Q \,. t) CID Q O u. r c o co cA mr i=am O Subcat 1\ P-1 / \\ Existing orth Pond ( 2a) 1.1 Subcat 2 S 1 Subcat 1.1 Subcat 3� B 1 Pond Outlet / \ FB-1\ (_1, Subcat 4 OUTLE Subcat 2Subcat 5 (8 ) (6 ) ® Subcat\ O let Stream/Pond ACB Subcat Subcat Bioretention sin S-2 Out, to Inlet from I (5.2) SMP-1 /ucat 5.2 Bioretention sin Bioret ntion Basin S-3 P-2 4 \ / A�B // \\ Inlet from SMP-1 to Inlet nlarged Pond with Subcat 7.1 CB-4 ( 5.1) from4Pond OCS Subcat 5.1-------------------/> D S-4 1a" Inlet fro Pond to AP-2 CB At D •MH-3 D MHS /9 ) 24" 24" 24" Sub;at 9 ce MP-4 ....--\i AP-1 CDS-8 AP-2 AP-1 AP-2 Subcat Reach 'on• Link Routing Diagram for POST-DEV Prepared by The LA Group, Printed 11/25/2019 HydroCAD®10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC POST-DEV Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 18.044 74 >75% Grass cover, Good, HSG C (1, 1.1, 2, 2a, 3, 4, 5.1, 6, 7, 7.1, 8, 9) 12.219 98 Paved parking, HSG C (1, 1.1, 2, 2a, 3, 4, 5, 5.1, 5.2, 6, 7, 8, 9) 0.711 70 Woods, Good, HSG C (7, 7.1, 9) 30.974 83 TOTAL AREA POST-DEV Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 30.974 HSG C 1, 1.1, 2, 2a, 3, 4, 5, 5.1, 5.2, 6, 7, 7.1, 8, 9 0.000 HSG D 0.000 Other 30.974 TOTAL AREA POST-DEV Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 18.044 0.000 0.000 18.044 >75% Grass cover, Good 1, 1.1, 2, 2a, 3, 4, 5.1, 6, 7, 7.1, 8, 9 0.000 0.000 12.219 0.000 0.000 12.219 Paved parking 1, 1.1, 2, 2a, 3, 4, 5, 5.1, 5.2, 6, 7, 8, 9 0.000 0.000 0.711 0.000 0.000 0.711 Woods, Good 7, 7.1, 9 0.000 0.000 30.974 0.000 0.000 30.974 TOTAL AREA POST-DEV Type II 24-hr 1YR Rainfall=2.15" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 5 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 1: Subcat 1 Runoff Area=10.347 ac 22.57% Impervious Runoff Depth>0.55" Flow Length=820' Slope=0.0600 '1 Tc=11.4 min CN=79 Runoff=8.74 cfs 0.472 af Subcatchment 1.1: Subcat 1.1 Runoff Area=7.724 ac 29.94% Impervious Runoff Depth>0.63" Tc=6.0 min CN=81 Runoff=9.35 cfs 0.408 af Subcatchment2: Subcat 2 Runoff Area=6.426 ac 69.65% Impervious Runoff Depth>1.20" Tc=6.0 min CN=91 Runoff=14.14 cfs 0.644 af Subcatchment 2a: Subcat 2a Runoff Area=0.430 ac 28.33% Impervious Runoff Depth>0.63" Tc=6.0 min CN=81 Runoff=0.52 cfs 0.023 af Subcatchment3: Subcat 3 Runoff Area=1.268 ac 80.16% Impervious Runoff Depth>1.36" Tc=6.0 min CN=93 Runoff=3.08 cfs 0.143 af Subcatchment4: Subcat4 Runoff Area=0.585 ac 62.32% Impervious Runoff Depth>1.07" Tc=6.0 min CN=89 Runoff=1.16 cfs 0.052 af Subcatchment5: Subcat 5 Runoff Area=0.155 ac 100.00% Impervious Runoff Depth>1.79" Tc=6.0 min CN=98 Runoff=0.45 cfs 0.023 af Subcatchment5.1: Subcat 5.1 Runoff Area=0.607 ac 100.00% Impervious Runoff Depth>1.79" Tc=6.0 min CN=98 Runoff=1.77 cfs 0.091 af Subcatchment5.2: Subcat 5.2 Runoff Area=0.165 ac 100.00% Impervious Runoff Depth>1.79" Tc=6.0 min CN=98 Runoff=0.48 cfs 0.025 af Subcatchment6: Subcat 6 Runoff Area=0.458 ac 17.44% Impervious Runoff Depth>0.51" Tc=6.0 min CN=78 Runoff=0.44 cfs 0.019 af Subcatchment7: Subcat 7 Runoff Area=1.392 ac 23.74% Impervious Runoff Depth>0.51" Tc=6.0 min CN=78 Runoff=1.34 cfs 0.059 af Subcatchment7.1: Subcat 7.1 Runoff Area=0.666 ac 0.00% Impervious Runoff Depth>0.34" Tc=6.0 min CN=73 Runoff=0.40 cfs 0.019 af Subcatchment8: Subcat 8 Runoff Area=0.458 ac 37.45% Impervious Runoff Depth>0.73" Tc=6.0 min CN=83 Runoff=0.64 cfs 0.028 af Subcatchment9: Subcat 9 Runoff Area=0.293 ac 28.70% Impervious Runoff Depth>0.63" Tc=6.0 min CN=81 Runoff=0.36 cfs 0.015 af Reach S-1: N Pond to Outlet Avg. Flow Depth=0.43' Max Vel=3.94 fps Inflow=9.82 cfs 0.843 af n=0.030 L=380.0' S=0.0237 '/' Capacity=578.56 cfs Outflow=9.58 cfs 0.841 af Reach S-2: Outlet to Inlet from SMP-1 Avg. Flow Depth=0.45' Max Vel=2.72 fps Inflow=6.92 cfs 0.517 af n=0.030 L=92.0' S=0.0109 '/' Capacity=628.01 cfs Outflow=6.89 cfs 0.516 af POST-DEV Type II 24-hr 1YR Rainfall=2.15" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 6 Reach S-3: Inlet from SMP-1 to Inlet Avg. Flow Depth=0.47' Max Vel=2.43 fps Inflow=6.89 cfs 0.578 af n=0.030 L=244.0' S=0.0082 '/' Capacity=545.36 cfs Outflow=6.64 cfs 0.576 af Reach S-4: Inlet from Pond to AP-2 Avg. Flow Depth=0.46' Max Vel=2.56 fps Inflow=6.83 cfs 0.848 af n=0.030 L=215.0' S=0.0093 '/' Capacity=580.98 cfs Outflow=6.73 cfs 0.846 af Pond CB-2: 24" Peak EIev=385.50' Inflow=14.59 cfs 0.667 af 24.0" Round Culvert n=0.012 L=171.0' S=0.0056 '1 Outflow=14.59 cfs 0.667 af Pond CB-4: 24" Peak EIev=384.74' Inflow=15.07 cfs 0.692 af 24.0" Round Culvert n=0.012 L=85.0' S=0.0049 '1 Outflow=15.07 cfs 0.692 af Pond DMH-2: 24" Peak EIev=383.95' Inflow=15.07 cfs 0.692 af 24.0" Round Culvert n=0.012 L=240.0' S=0.0043 '1 Outflow=15.07 cfs 0.692 af Pond DMH-3: 24" Peak EIev=382.62' Inflow=15.07 cfs 0.692 af Primary=10.15 cfs 0.609 af Secondary=5.36 cfs 0.082 af Outflow=15.07 cfs 0.692 af Pond DMH-4: 24" Peak EIev=381.84' Inflow=7.08 cfs 0.199 af 30.0" Round Culvert n=0.012 L=80.0' S=0.0050 '1 Outflow=7.08 cfs 0.199 af Pond FB-1: FB-1 Peak EIev=394.17' Storage=1,928 cf Inflow=3.08 cfs 0.143 af Outflow=3.04 cfs 0.105 af Pond OUTLET: Outlet Stream/Pond Peak EIev=389.50' Inflow=11.19 cfs 0.915 af Primary=5.60 cfs 0.458 of Secondary=5.60 cfs 0.458 of Outflow=11.19 cfs 0.915 of Pond P-1: Existing North Pond Peak EIev=401.32' Storage=46.747 cf Inflow=8.74 cfs 0.472 af Outflow=2.18 cfs 0.436 af Pond P-2: Enlarged Pond with OCS Peak EIev=387.52' Storage=10.569 cf Inflow=6.00 cfs 0.477 af Outflow=0.61 cfs 0.272 af Pond SMP-1: Bioretention Basin Peak EIev=394.06' Storage=1,981 cf Inflow=3.04 cfs 0.105 af Outflow=0.50 cfs 0.062 af Pond SMP-2: Bioretention Basin Peak EIev=387.53' Storage=644 cf Inflow=0.64 cfs 0.028 af Outflow=0.06 cfs 0.014 af Pond SMP-3: Bioretention Basin Peak EIev=387.53' Storage=345 cf Inflow=0.44 cfs 0.019 af Outflow=0.08 cfs 0.012 af Pond SMP-4: CDS-8 Peak EIev=382.25' Inflow=10.15 cfs 0.609 af 24.0" Round Culvert n=0.012 L=70.0' S=0.0047 '1 Outflow=10.15 cfs 0.609 af Pond YD-6: 18" Peak EIev=382.22' Inflow=1.77 cfs 0.116 af 18.0" Round Culvert n=0.012 L=96.0' S=0.0065 '1 Outflow=1.77 cfs 0.116 af Link AP-1: AP-1 Inflow=0.36 cfs 0.015 af Primary=0.36 cfs 0.015 af Link AP-2: AP-2 Inflow=22.32 cfs 1.654 af Primary=22.32 cfs 1.654 af POST-DEV Type II 24-hr 1YR Rainfall=2.15" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 7 Total Runoff Area = 30.974 ac Runoff Volume = 2.021 of Average Runoff Depth = 0.78" 60.55% Pervious = 18.755 ac 39.45% Impervious = 12.219 ac POST-DEV Type II 24-hr 10YR Rainfall=3.75" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 8 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment1: Subcat 1 Runoff Area=10.347 ac 22.57% Impervious Runoff Depth>1.61" Flow Length=820' Slope=0.0600 '1 Tc=11.4 min CN=79 Runoff=26.39 cfs 1.392 af Subcatchment 1.1: Subcat 1.1 Runoff Area=7.724 ac 29.94% Impervious Runoff Depth>1.76" Tc=6.0 min CN=81 Runoff=25.42 cfs 1.135 af Subcatchment2: Subcat 2 Runoff Area=6.426 ac 69.65% Impervious Runoff Depth>2.60" Tc=6.0 min CN=91 Runoff=29.21 cfs 1.394 af Subcatchment2a: Subcat 2a Runoff Area=0.430 ac 28.33% Impervious Runoff Depth>1.76" Tc=6.0 min CN=81 Runoff=1.41 cfs 0.063 af Subcatchment3: Subcat 3 Runoff Area=1.268 ac 80.16% Impervious Runoff Depth>2.79" Tc=6.0 min CN=93 Runoff=6.05 cfs 0.295 af Subcatchment4: Subcat4 Runoff Area=0.585 ac 62.32% Impervious Runoff Depth>2.42" Tc=6.0 min CN=89 Runoff=2.52 cfs 0.118 af Subcatchment5: Subcat 5 Runoff Area=0.155 ac 100.00% Impervious Runoff Depth>3.24" Tc=6.0 min CN=98 Runoff=0.80 cfs 0.042 af Subcatchment5.1: Subcat 5.1 Runoff Area=0.607 ac 100.00% Impervious Runoff Depth>3.24" Tc=6.0 min CN=98 Runoff=3.14 cfs 0.164 af Subcatchment5.2: Subcat 5.2 Runoff Area=0.165 ac 100.00% Impervious Runoff Depth>3.24" Tc=6.0 min CN=98 Runoff=0.85 cfs 0.044 af Subcatchment6: Subcat 6 Runoff Area=0.458 ac 17.44% Impervious Runoff Depth>1.55" Tc=6.0 min CN=78 Runoff=1.34 cfs 0.059 af Subcatchment7: Subcat 7 Runoff Area=1.392 ac 23.74% Impervious Runoff Depth>1.55" Tc=6.0 min CN=78 Runoff=4.06 cfs 0.180 af Subcatchment7.1: Subcat 7.1 Runoff Area=0.666 ac 0.00% Impervious Runoff Depth>1.22" Tc=6.0 min CN=73 Runoff=1.56 cfs 0.068 af Subcatchment8: Subcat 8 Runoff Area=0.458 ac 37.45% Impervious Runoff Depth>1.91" Tc=6.0 min CN=83 Runoff=1.63 cfs 0.073 af Subcatchment9: Subcat 9 Runoff Area=0.293 ac 28.70% Impervious Runoff Depth>1.76" Tc=6.0 min CN=81 Runoff=0.97 cfs 0.043 af Reach S-1: N Pond to Outlet Avg. Flow Depth=0.84' Max Vel=5.73 fps Inflow=30.18 cfs 2.465 af n=0.030 L=380.0' S=0.0237 '1 Capacity=578.56 cfs Outflow=29.94 cfs 2.461 af Reach S-2: Outlet to Inlet from SMP-1 Avg. Flow Depth=0.85' Max Vel=3.91 fps Inflow=20.87 cfs 1.501 af n=0.030 L=92.0' S=0.0109 '1 Capacity=628.01 cfs Outflow=20.85 cfs 1.500 af POST-DEV Type II 24-hr 10YR Rainfall=3.75" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 9 Reach S-3: Inlet from SMP-1 to Inlet Avg. Flow Depth=1.03' Max Vel=3.79 fps Inflow=26.13 cfs 1.713 af n=0.030 L=244.0' S=0.0082 '1 Capacity=545.36 cfs Outflow=25.70 cfs 1.710 af Reach S-4: Inlet from Pond to AP-2 Avg. Flow Depth=1.04' Max Vel=4.03 fps Inflow=27.79 cfs 2.862 af n=0.030 L=215.0' S=0.0093 '1 Capacity=580.98 cfs Outflow=27.62 cfs 2.859 af Pond CB-2: 24" Peak Elev=394.83' Inflow=30.01 cfs 1.436 af 24.0" Round Culvert n=0.012 L=171.0' S=0.0056 '1 Outflow=30.01 cfs 1.436 af Pond CB-4: 24" Peak Elev=392.76' Inflow=30.86 cfs 1.480 af 24.0" Round Culvert n=0.012 L=85.0' S=0.0049 '1 Outflow=30.86 cfs 1.480 af Pond DMH-2: 24" Peak Elev=389.44' Inflow=30.86 cfs 1.480 af 24.0" Round Culvert n=0.012 L=240.0' S=0.0043 '1 Outflow=30.86 cfs 1.480 af Pond DMH-3: 24" Peak Elev=383.87' Inflow=30.86 cfs 1.480 af Primary=15.70 cfs 1.202 af Secondary=15.26 cfs 0.278 af Outflow=30.86 cfs 1.480 af Pond DMH-4: 24" Peak Elev=382.97' Inflow=20.80 cfs 0.553 af 30.0" Round Culvert n=0.012 L=80.0' S=0.0050 '1 Outflow=20.80 cfs 0.553 af Pond FB-1: FB-1 Peak Elev=394.34' Storage=2,242 cf Inflow=6.05 cfs 0.295 af Outflow=5.70 cfs 0.256 af Pond OUTLET: Outlet Stream/Pond Peak EIev=390.03' Inflow=33.71 cfs 2.642 af Primary=16.86 cfs 1.321 af Secondary=16.86 cfs 1.321 af Outflow=33.71 cfs 2.642 af Pond P-1: Existing North Pond Peak EIev=401.88' Storage=60.087 cf Inflow=26.39 cfs 1.392 af Outflow=11.03 cfs 1.331 af Pond P-2: Enlarged Pond with OCS Peak EIev=388.61' Storage=20.458 cf Inflow=18.39 cfs 1.389 af Outflow=5.19 cfs 1.153 af Pond SMP-1: Bioretention Basin Peak EIev=394.30' Storage=2,534 cf Inflow=5.70 cfs 0.256 af Outflow=5.30 cfs 0.213 af Pond SMP-2: Bioretention Basin Peak EIev=387.73' Storage=943 cf Inflow=1.63 cfs 0.073 af Outflow=1.42 cfs 0.059 af Pond SMP-3: Bioretention Basin Peak EIev=387.71' Storage=496 cf Inflow=1.34 cfs 0.059 af Outflow=1.28 cfs 0.052 af Pond SMP-4: CDS-8 Peak EIev=382.91' Inflow=15.70 cfs 1.202 af 24.0" Round Culvert n=0.012 L=70.0' S=0.0047 '1 Outflow=15.70 cfs 1.202 af Pond YD-6: 18" Peak EIev=383.36' Inflow=5.66 cfs 0.274 af 18.0" Round Culvert n=0.012 L=96.0' S=0.0065 '1 Outflow=5.66 cfs 0.274 af Link AP-1: AP-1 Inflow=0.97 cfs 0.043 af Primary=0.97 cfs 0.043 af Link AP-2: AP-2 Inflow=60.92 cfs 4.613 af Primary=60.92 cfs 4.613 af POST-DEV Type II 24-hr 10YR Rainfall=3.75" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 10 Total Runoff Area = 30.974 ac Runoff Volume = 5.070 of Average Runoff Depth = 1.96" 60.55% Pervious = 18.755 ac 39.45% Impervious = 12.219 ac POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 1 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 1: Subcat 1 Runoff Area=10.347 ac 22.57% Impervious Runoff Depth>3.58" Flow Length=820' Slope=0.0600 '1 Tc=11.4 min CN=79 Runoff=57.15 cfs 3.088 af Subcatchment 1.1: Subcat 1.1 Runoff Area=7.724 ac 29.94% Impervious Runoff Depth>3.79" Tc=6.0 min CN=81 Runoff=52.73 cfs 2.439 af Subcatchment2: Subcat 2 Runoff Area=6.426 ac 69.65% Impervious Runoff Depth>4.83" Tc=6.0 min CN=91 Runoff=52.10 cfs 2.585 af Subcatchment2a: Subcat 2a Runoff Area=0.430 ac 28.33% Impervious Runoff Depth>3.79" Tc=6.0 min CN=81 Runoff=2.93 cfs 0.136 af Subcatchment3: Subcat 3 Runoff Area=1.268 ac 80.16% Impervious Runoff Depth>5.03" Tc=6.0 min CN=93 Runoff=10.52 cfs 0.531 af Subcatchment4: Subcat4 Runoff Area=0.585 ac 62.32% Impervious Runoff Depth>4.62" Tc=6.0 min CN=89 Runoff=4.62 cfs 0.225 af Subcatchment5: Subcat 5 Runoff Area=0.155 ac 100.00% Impervious Runoff Depth>5.45" Tc=6.0 min CN=98 Runoff=1.33 cfs 0.070 af Subcatchment5.1: Subcat 5.1 Runoff Area=0.607 ac 100.00% Impervious Runoff Depth>5.45" Tc=6.0 min CN=98 Runoff=5.22 cfs 0.276 af Subcatchment5.2: Subcat 5.2 Runoff Area=0.165 ac 100.00% Impervious Runoff Depth>5.45" Tc=6.0 min CN=98 Runoff=1.42 cfs 0.075 af Subcatchment6: Subcat 6 Runoff Area=0.458 ac 17.44% Impervious Runoff Depth>3.49" Tc=6.0 min CN=78 Runoff=2.92 cfs 0.133 af Subcatchment7: Subcat 7 Runoff Area=1.392 ac 23.74% Impervious Runoff Depth>3.49" Tc=6.0 min CN=78 Runoff=8.88 cfs 0.405 af Subcatchment7.1: Subcat 7.1 Runoff Area=0.666 ac 0.00% Impervious Runoff Depth>3.00" Tc=6.0 min CN=73 Runoff=3.73 cfs 0.167 af Subcatchment8: Subcat 8 Runoff Area=0.458 ac 37.45% Impervious Runoff Depth>4.00" Tc=6.0 min CN=83 Runoff=3.26 cfs 0.153 af Subcatchment9: Subcat 9 Runoff Area=0.293 ac 28.70% Impervious Runoff Depth>3.79" Tc=6.0 min CN=81 Runoff=2.00 cfs 0.093 af Reach S-1: N Pond to Outlet Avg. Flow Depth=1.32' Max Vel=7.34 fps Inflow=67.95 cfs 5.435 af n=0.030 L=380.0' S=0.0237 '1 Capacity=578.56 cfs Outflow=67.77 cfs 5.429 af Reach S-2: Outlet to Inlet from SMP-1 Avg. Flow Depth=1.32' Max Vel=4.97 fps Inflow=45.83 cfs 3.415 af n=0.030 L=92.0' S=0.0109 '1 Capacity=628.01 cfs Outflow=45.89 cfs 3.413 af POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 2 Reach S-3: Inlet from SMP-1 to Inlet Avg. Flow Depth=1.54' Max Vel=4.69 fps Inflow=53.24 cfs 3.863 af n=0.030 L=244.0' S=0.0082 '1 Capacity=545.36 cfs Outflow=52.97 cfs 3.858 af Reach S-4: Inlet from Pond to AP-2 Avg. Flow Depth=1.74' Max Vel=5.32 fps Inflow=70.23 cfs 6.548 af n=0.030 L=215.0' S=0.0093 '1 Capacity=580.98 cfs Outflow=70.67 cfs 6.542 af Pond CB-2: 24" Peak Elev=422.19' Inflow=53.43 cfs 2.656 af 24.0" Round Culvert n=0.012 L=171.0' S=0.0056 '1 Outflow=53.43 cfs 2.656 af Pond CB-4: 24" Peak Elev=415.19' Inflow=54.85 cfs 2.730 af 24.0" Round Culvert n=0.012 L=85.0' S=0.0049 '1 Outflow=54.85 cfs 2.730 af Pond DMH-2: 24" Peak EIev=404.77' Inflow=54.85 cfs 2.730 af 24.0" Round Culvert n=0.012 L=240.0' S=0.0043 '1 Outflow=54.85 cfs 2.730 af Pond DMH-3: 24" Peak EIev=387.67' Inflow=54.85 cfs 2.730 af Primary=27.26 cfs 2.104 af Secondary=27.59 cfs 0.627 af Outflow=54.85 cfs 2.730 af Pond DMH-4: 24" Peak EIev=384.74' Inflow=38.27 cfs 1.166 af 30.0" Round Culvert n=0.012 L=80.0' S=0.0050 '1 Outflow=38.27 cfs 1.166 af Pond FB-1: FB-1 Peak EIev=394.61' Storage=2,794 cf Inflow=10.52 cfs 0.531 af Outflow=9.74 cfs 0.492 af Pond OUTLET: Outlet Stream/Pond Peak EIev=390.79' Inflow=75.02 cfs 5.790 af Primary=37.13 cfs 3.010 af Secondary=37.89 cfs 2.780 af Outflow=75.02 cfs 5.790 af Pond P-1: Existing North Pond Peak EIev=402.69' Storage=80.915 cf Inflow=57.15 cfs 3.088 af Outflow=29.21 cfs 2.996 af Pond P-2: Enlarged Pond with OCS Peak EIev=389.93' Storage=34.671 cf Inflow=41.57 cfs 2.946 af Outflow=22.46 cfs 2.690 af Pond SMP-1: Bioretention Basin Peak EIev=394.61' Storage=3,337 cf Inflow=9.74 cfs 0.492 af Outflow=7.37 cfs 0.449 af Pond SMP-2: Bioretention Basin Peak EIev=387.88' Storage=1,187 cf Inflow=3.26 cfs 0.153 af Outflow=3.02 cfs 0.138 af Pond SMP-3: Bioretention Basin Peak EIev=387.87' Storage=634 cf Inflow=2.92 cfs 0.133 af Outflow=2.84 cfs 0.125 af Pond SMP-4: CDS-8 Peak EIev=384.83' Inflow=27.26 cfs 2.104 af 24.0" Round Culvert n=0.012 L=70.0' S=0.0047 '1 Outflow=27.26 cfs 2.104 af Pond YD-6: 18" Peak EIev=386.36' Inflow=10.91 cfs 0.539 af 18.0" Round Culvert n=0.012 L=96.0' S=0.0065 '1 Outflow=10.91 cfs 0.539 af Link AP-1: AP-1 Inflow=2.00 cfs 0.093 af Primary=2.00 cfs 0.093 af Link AP-2: AP-2 Inflow=127.87 cfs 9.812 af Primary=127.87 cfs 9.812 af POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 3 Total Runoff Area = 30.974 ac Runoff Volume = 10.376 of Average Runoff Depth = 4.02" 60.55% Pervious = 18.755 ac 39.45% Impervious = 12.219 ac POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 1: Subcat 1 Runoff = 57.15 cfs @ 12.03 hrs, Volume= 3.088 af, Depth> 3.58" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 8.011 74 >75% Grass cover, Good, HSG C 2.335 98 Paved parking, HSG C 10.347 79 Weighted Average 8.011 77.43% Pervious Area 2.335 22.57% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.4 820 0.0600 1.20 Lag/CN Method, Summary for Subcatchment 1.1: Subcat 1.1 Runoff = 52.73 cfs @ 11.97 hrs, Volume= 2.439 af, Depth> 3.79" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 5.412 74 >75% Grass cover, Good, HSG C 2.312 98 Paved parking, HSG C 7.724 81 Weighted Average 5.412 70.06% Pervious Area 2.312 29.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2: Subcat 2 Runoff = 52.10 cfs @ 11.96 hrs, Volume= 2.585 af, Depth> 4.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 1.950 74 >75% Grass cover, Good, HSG C 4.476 98 Paved parking, HSG C 6.426 91 Weighted Average 1.950 30.35% Pervious Area 4.476 69.65% Impervious Area POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 5 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 2a: Subcat 2a Runoff = 2.93 cfs @ 11.97 hrs, Volume= 0.136 af, Depth> 3.79" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.308 74 >75% Grass cover, Good, HSG C 0.122 98 Paved parking, HSG C 0.430 81 Weighted Average 0.308 71.67% Pervious Area 0.122 28.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 3: Subcat 3 Runoff = 10.52 cfs @ 11.96 hrs, Volume= 0.531 af, Depth> 5.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.252 74 >75% Grass cover, Good, HSG C 1.017 98 Paved parking, HSG C 1.268 93 Weighted Average 0.252 19.84% Pervious Area 1.017 80.16% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 4: Subcat 4 Runoff = 4.62 cfs @ 11.96 hrs, Volume= 0.225 af, Depth> 4.62" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 6 Area (ac) CN Description 0.220 74 >75% Grass cover, Good, HSG C 0.365 98 Paved parking, HSG C 0.585 89 Weighted Average 0.220 37.68% Pervious Area 0.365 62.32% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 5: Subcat 5 Runoff = 1.33 cfs @ 11.96 hrs, Volume= 0.070 af, Depth> 5.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.155 98 Paved parking, HSG C 0.155 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 5.1: Subcat 5.1 Runoff = 5.22 cfs @ 11.96 hrs, Volume= 0.276 af, Depth> 5.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.000 74 >75% Grass cover, Good, HSG C 0.607 98 Paved parking, HSG C 0.607 98 Weighted Average 0.000 0.00% Pervious Area 0.607 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 5.2: Subcat 5.2 Runoff = 1.42 cfs @ 11.96 hrs, Volume= 0.075 af, Depth> 5.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.165 98 Paved parking, HSG C 0.165 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 6: Subcat 6 Runoff = 2.92 cfs @ 11.97 hrs, Volume= 0.133 af, Depth> 3.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.378 74 >75% Grass cover, Good, HSG C 0.080 98 Paved parking, HSG C 0.458 78 Weighted Average 0.378 82.56% Pervious Area 0.080 17.44% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 7: Subcat 7 Runoff = 8.88 cfs @ 11.97 hrs, Volume= 0.405 af, Depth> 3.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.497 74 >75% Grass cover, Good, HSG C 0.331 98 Paved parking, HSG C 0.565 70 Woods, Good, HSG C 1.392 78 Weighted Average 1.061 76.26% Pervious Area 0.331 23.74% Impervious Area POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 8 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 7.1: Subcat 7.1 Runoff = 3.73 cfs @ 11.97 hrs, Volume= 0.167 af, Depth> 3.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.545 74 >75% Grass cover, Good, HSG C 0.121 70 Woods, Good, HSG C 0.666 73 Weighted Average 0.666 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 8: Subcat 8 Runoff = 3.26 cfs @ 11.97 hrs, Volume= 0.153 af, Depth> 4.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" Area (ac) CN Description 0.287 74 >75% Grass cover, Good, HSG C 0.172 98 Paved parking, HSG C 0.458 83 Weighted Average 0.287 62.55% Pervious Area 0.172 37.45% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 9: Subcat 9 Runoff = 2.00 cfs @ 11.97 hrs, Volume= 0.093 af, Depth> 3.79" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100YR Rainfall=6.20" POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 9 Area (ac) CN Description 0.184 74 >75% Grass cover, Good, HSG C 0.084 98 Paved parking, HSG C 0.025 70 Woods, Good, HSG C 0.293 81 Weighted Average 0.209 71.30% Pervious Area 0.084 28.70% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Reach S-1: N Pond to Outlet Inflow Area = 18.071 ac, 25.72% Impervious, Inflow Depth > 3.61" for 100YR event Inflow = 67.95 cfs @ 11.98 hrs, Volume= 5.435 af Outflow = 67.77 cfs @ 12.00 hrs, Volume= 5.429 af, Atten= 0%, Lag= 0.7 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 7.34 fps, Min. Travel Time= 0.9 min Avg. Velocity = 2.39 fps, Avg. Travel Time= 2.6 min Peak Storage= 3,508 cf @ 12.00 hrs Average Depth at Peak Storage= 1.32' Bank-Full Depth= 4.00' Flow Area= 44.0 sf, Capacity= 578.56 cfs 5.00' x 4.00' deep channel, n= 0.030 Stream, clean & straight Side Slope Z-value= 1.5 '/' Top Width= 17.00' Length= 380.0' Slope= 0.0237 '/' Inlet Invert= 399.00', Outlet Invert= 390.00' Summary for Reach S-2: Outlet to Inlet from SMP-1 Inflow Area = 20.477 ac, 26.69% Impervious, Inflow Depth > 2.00" for 100YR event Inflow = 45.83 cfs @ 11.99 hrs, Volume= 3.415 of Outflow = 45.89 cfs @ 11.99 hrs, Volume= 3.413 af, Atten= 0%, Lag= 0.3 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 4.97 fps, Min. Travel Time= 0.3 min Avg. Velocity = 1.53 fps, Avg. Travel Time= 1.0 min Peak Storage= 849 cf @ 11.99 hrs Average Depth at Peak Storage= 1.32' Bank-Full Depth= 5.00' Flow Area= 62.5 sf, Capacity= 628.01 cfs POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 10 5.00' x 5.00' deep channel, n= 0.030 Stream, clean & straight Side Slope Z-value= 1.5 '/' Top Width= 20.00' Length= 92.0' Slope= 0.0109 '/' Inlet Invert= 388.00', Outlet Invert= 387.00' Summary for Reach S-3: Inlet from SMP-1 to Inlet from Pond Inflow Area = 21.746 ac, 29.81% Impervious, Inflow Depth > 2.13" for 100YR event Inflow = 53.24 cfs @ 11.99 hrs, Volume= 3.863 af Outflow = 52.97 cfs @ 12.00 hrs, Volume= 3.858 af, Atten= 1%, Lag= 0.6 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 4.69 fps, Min. Travel Time= 0.9 min Avg. Velocity = 1.44 fps, Avg. Travel Time= 2.8 min Peak Storage= 2,757 cf @ 12.00 hrs Average Depth at Peak Storage= 1.54' Bank-Full Depth= 5.00' Flow Area= 62.5 sf, Capacity= 545.36 cfs 5.00' x 5.00' deep channel, n= 0.030 Stream, clean & straight Side Slope Z-value= 1.5 '/' Top Width= 20.00' Length= 244.0' Slope= 0.0082 '/' Inlet Invert= 386.50', Outlet Invert= 384.50' Summary for Reach S-4: Inlet from Pond to AP-2 Inflow Area = 22.412 ac, 28.92% Impervious, Inflow Depth > 3.51" for 100YR event Inflow = 70.23 cfs @ 12.03 hrs, Volume= 6.548 af Outflow = 70.67 cfs @ 12.04 hrs, Volume= 6.542 af, Atten= 0%, Lag= 0.8 min Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Max. Velocity= 5.32 fps, Min. Travel Time= 0.7 min Avg. Velocity = 1.79 fps, Avg. Travel Time= 2.0 min Peak Storage= 2,854 cf @ 12.04 hrs Average Depth at Peak Storage= 1.74' Bank-Full Depth= 5.00' Flow Area= 62.5 sf, Capacity= 580.98 cfs POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 11 5.00' x 5.00' deep channel, n= 0.030 Stream, clean & straight Side Slope Z-value= 1.5 '/' Top Width= 20.00' Length= 215.0' Slope= 0.0093 '/' Inlet Invert= 384.00', Outlet Invert= 382.00' Summary for Pond CB-2: 24" Inflow Area = 6.580 ac, 70.37% Impervious, Inflow Depth > 4.84" for 100YR event Inflow = 53.43 cfs @ 11.96 hrs, Volume= 2.656 af Outflow = 53.43 cfs @ 11.96 hrs, Volume= 2.656 af, Atten= 0%, Lag= 0.0 min Primary = 53.43 cfs @ 11.96 hrs, Volume= 2.656 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 422.19' @ 12.02 hrs Device Routing Invert Outlet Devices #1 Primary 383.26' 24.0" Round Culvert L= 171.0' Ke= 0.500 Inlet/ Outlet Invert= 383.26' / 382.30' S= 0.0056 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=29.13 cfs @ 11.96 hrs HW=414.78' TW=410.36' (Dynamic Tailwater) L1=Culvert (Outlet Controls 29.13 cfs @ 9.27 fps) Summary for Pond CB-4: 24" Inflow Area = 6.745 ac, 71.09% Impervious, Inflow Depth > 4.86" for 100YR event Inflow = 54.85 cfs @ 11.96 hrs, Volume= 2.730 af Outflow = 54.85 cfs @ 11.96 hrs, Volume= 2.730 af, Atten= 0%, Lag= 0.0 min Primary = 54.85 cfs @ 11.96 hrs, Volume= 2.730 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 415.19' @ 12.00 hrs Device Routing Invert Outlet Devices #1 Primary 382.20' 24.0" Round Culvert L= 85.0' Ke= 0.500 Inlet/ Outlet Invert= 382.20' / 381.78' S= 0.0049 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=38.78 cfs @ 11.96 hrs HW=410.35' TW=403.78' (Dynamic Tailwater) L1=Culvert (Inlet Controls 38.78 cfs @ 12.34 fps) POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 12 Summary for Pond DMH-2: 24" Inflow Area = 6.745 ac, 71.09% Impervious, Inflow Depth > 4.86" for 100YR event Inflow = 54.85 cfs @ 11.96 hrs, Volume= 2.730 af Outflow = 54.85 cfs @ 11.96 hrs, Volume= 2.730 af, Atten= 0%, Lag= 0.0 min Primary = 54.85 cfs @ 11.96 hrs, Volume= 2.730 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 404.77' @ 11.97 hrs Device Routing Invert Outlet Devices #1 Primary 381.68' 24.0" Round Culvert L= 240.0' Ke= 0.500 Inlet/ Outlet Invert= 381.68' / 380.65' S= 0.0043 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=51.04 cfs @ 11.96 hrs HW=403.78' TW=387.19' (Dynamic Tailwater) 4-1=Culvert (Outlet Controls 51.04 cfs @ 16.25 fps) Summary for Pond DMH-3: 24" Inflow Area = 6.745 ac, 71.09% Impervious, Inflow Depth > 4.86" for 100YR event Inflow = 54.85 cfs @ 11.96 hrs, Volume= 2.730 af Outflow = 54.85 cfs @ 11.96 hrs, Volume= 2.730 af, Atten= 0%, Lag= 0.0 min Primary = 27.26 cfs @ 11.96 hrs, Volume= 2.104 af Secondary = 27.59 cfs @ 11.96 hrs, Volume= 0.627 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 387.67' @ 11.99 hrs Device Routing Invert Outlet Devices #1 Primary 380.60' 24.0" Round Culvert L= 10.0' Ke= 0.500 Inlet/ Outlet Invert= 380.60' / 380.55' S= 0.0050 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf #2 Secondary 381.39' 24.0" Round Culvert L= 10.0' Ke= 0.500 Inlet/ Outlet Invert= 381.39' / 381.34' S= 0.0050 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=23.74 cfs @ 11.96 hrs HW=387.18' TW=384.71' (Dynamic Tailwater) L1=Culvert (Inlet Controls 23.74 cfs @ 7.56 fps) Secondary OutFlow Max=24.23 cfs @ 11.96 hrs HW=387.20' TW=384.63' (Dynamic Tailwater) 4-2=Culvert (Inlet Controls 24.23 cfs @ 7.71 fps) Summary for Pond DMH-4: 24" Inflow Area = 1.524 ac, 56.36% Impervious, Inflow Depth > 9.18" for 100YR event Inflow = 38.27 cfs @ 11.97 hrs, Volume= 1.166 af Outflow = 38.27 cfs @ 11.97 hrs, Volume= 1.166 af, Atten= 0%, Lag= 0.0 min Primary = 38.27 cfs @ 11.97 hrs, Volume= 1.166 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 13 Peak Elev= 384.74' @ 11.97 hrs Device Routing Invert Outlet Devices #1 Primary 380.62' 30.0" Round Culvert L= 80.0' Ke= 0.500 Inlet/ Outlet Invert= 380.62' / 380.22' S= 0.0050 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 4.91 sf Primary OutFlow Max=37.20 cfs @ 11.97 hrs HW=384.62' TW=0.00' (Dynamic Tailwater) L1=Culvert (Barrel Controls 37.20 cfs @ 7.58 fps) Summary for Pond FB-1: FB-1 Inflow Area = 1.268 ac, 80.16% Impervious, Inflow Depth > 5.03" for 100YR event Inflow = 10.52 cfs @ 11.96 hrs, Volume= 0.531 af Outflow = 9.74 cfs @ 11.96 hrs, Volume= 0.492 af, Atten= 7%, Lag= 0.1 min Primary = 9.74 cfs @ 11.96 hrs, Volume= 0.492 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 394.61' @ 12.06 hrs Surf.Area= 2,183 sf Storage= 2,794 cf Plug-Flow detention time= 51.6 min calculated for 0.491 af(92% of inflow) Center-of-Mass det. time= 24.4 min ( 765.7 - 741.3 ) Volume Invert Avail.Storage Storage Description #1 392.00' 3,728 cf Custom Stage Data (Irregular)Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 392.00 225 100.0 0 0 225 393.00 820 165.0 492 492 1,602 394.00 1,550 195.0 1,166 1,657 2,480 395.00 2,640 250.0 2,071 3,728 4,441 Device Routing Invert Outlet Devices #1 Primary 394.00' 18.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=0.00 cfs @ 11.96 hrs HW=394.47' TW=394.50' (Dynamic Tailwater) L1=Broad-Crested Rectangular Weir( Controls 0.00 cfs) Summary for Pond OUTLET: Outlet Stream/Pond Inflow Area = 19.085 ac, 26.90% Impervious, Inflow Depth > 3.64" for 100YR event Inflow = 75.02 cfs @ 11.99 hrs, Volume= 5.790 af Outflow = 75.02 cfs @ 11.99 hrs, Volume= 5.790 af, Atten= 0%, Lag= 0.0 min Primary = 37.13 cfs @ 11.99 hrs, Volume= 3.010 of Secondary = 37.89 cfs @ 11.99 hrs, Volume= 2.780 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 14 Peak Elev= 390.79' @ 12.00 hrs Device Routing Invert Outlet Devices #1 Primary 389.00' 6.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 #2 Secondary 389.00' 6.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=36.29 cfs @ 11.99 hrs HW=390.77' TW=389.31' (Dynamic Tailwater) 4-1=Broad-Crested Rectangular Weir(Weir Controls 36.29 cfs @ 3.41 fps) Secondary OutFlow Max=35.15 cfs @ 11.99 hrs HW=390.77' TW=389.47' (Dynamic Tailwater) L2=Broad-Crested Rectangular Weir(Weir Controls 35.15 cfs @ 3.31 fps) Summary for Pond P-1: Existing North Pond Inflow Area = 10.347 ac, 22.57% Impervious, Inflow Depth > 3.58" for 100YR event Inflow = 57.15 cfs @ 12.03 hrs, Volume= 3.088 af Outflow = 29.21 cfs @ 12.16 hrs, Volume= 2.996 af, Atten= 49%, Lag= 8.1 min Primary = 29.21 cfs @ 12.16 hrs, Volume= 2.996 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Starting Elev= 401.00' Surf.Area= 22,263 sf Storage= 39,555 cf Peak Elev= 402.69' @ 12.16 hrs Surf.Area= 26,606 sf Storage= 80,915 cf (41,360 cf above start) Plug-Flow detention time= 137.9 min calculated for 2.088 af(68% of inflow) Center-of-Mass det. time= 27.8 min ( 805.9 - 778.1 ) Volume Invert Avail.Storage Storage Description #1 399.00' 117,925 cf Custom Stage Data (Irregular)Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 399.00 17,348 799.0 0 0 17,348 400.00 19,775 819.0 18,548 18,548 20,047 401.00 22,263 839.0 21,007 39,555 22,813 402.00 24,812 859.0 23,526 63,081 25,646 403.00 27,418 878.0 26,104 89,185 28,412 404.00 30,082 897.0 28,740 117,925 31,239 Device Routing Invert Outlet Devices #1 Primary 401.00' 5.0' long x 5.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88 Primary OutFlow Max=28.98 cfs @ 12.16 hrs HW=402.68' TW=399.97' (Dynamic Tailwater) 4-1=Broad-Crested Rectangular Weir(Weir Controls 28.98 cfs @ 3.44 fps) POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 15 Summary for Pond P-2: Enlarged Pond with OCS Inflow Area = 0.666 ac, 0.00% Impervious, Inflow Depth > 53.05" for 100YR event Inflow = 41.57 cfs @ 11.99 hrs, Volume= 2.946 af Outflow = 22.46 cfs @ 12.11 hrs, Volume= 2.690 af, Atten= 46%, Lag= 7.3 min Primary = 22.46 cfs @ 12.11 hrs, Volume= 2.690 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 389.93' @ 12.11 hrs Surf.Area= 11,765 sf Storage= 34,671 cf Plug-Flow detention time= 65.1 min calculated for 2.690 af(91% of inflow) Center-of-Mass det. time= 35.1 min ( 825.6 - 790.5 ) Volume Invert Avail.Storage Storage Description #1 386.00' 48,113 cf Custom Stage Data (Irregular)Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 386.00 5,878 348.0 0 0 5,878 387.00 7,311 402.0 6,581 6,581 9,123 387.40 7,985 441.0 3,058 9,640 11,744 388.00 8,931 483.0 5,072 14,712 14,845 389.00 10,379 517.0 9,646 24,358 17,596 390.00 11,869 542.0 11,116 35,473 19,769 391.00 13,427 562.0 12,640 48,113 21,611 Device Routing Invert Outlet Devices #1 Primary 386.00' 24.0" Round Culvert L= 60.0' Ke= 0.500 Inlet/ Outlet Invert= 386.00' / 385.50' S= 0.0083 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf #2 Device 1 386.00' 3.0" W x 3.0" H Vert. Orifice/Grate C= 0.600 #3 Device 1 387.40' 24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 389.00' 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=22.37 cfs @ 12.11 hrs HW=389.92' TW=385.61' (Dynamic Tailwater) L1=Culvert (Passes 22.37 cfs of 25.86 cfs potential flow) -2=Orifice/Grate (Orifice Controls 0.59 cfs @ 9.38 fps) -3=Orifice/Grate (Orifice Controls 7.25 cfs @ 7.25 fps) -4=Orifice/Grate (Orifice Controls 14.53 cfs @ 4.62 fps) Summary for Pond SMP-1: Bioretention Basin Inflow Area = 1.268 ac, 80.16% Impervious, Inflow Depth > 4.66" for 100YR event Inflow = 9.74 cfs @ 11.96 hrs, Volume= 0.492 af Outflow = 7.37 cfs @ 12.02 hrs, Volume= 0.449 af, Atten= 24%, Lag= 3.1 min Primary = 7.37 cfs @ 12.02 hrs, Volume= 0.449 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 394.61' @ 12.02 hrs Surf.Area= 2,688 sf Storage= 3,337 cf Plug-Flow detention time= 46.4 min calculated for 0.449 af(91% of inflow) POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 16 Center-of-Mass det. time= 16.2 min ( 781.9 - 765.7 ) Volume Invert Avail.Storage Storage Description #1 393.00' 4,446 cf Custom Stage Data (Irregular)Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 393.00 1,500 155.0 0 0 1,500 394.00 2,210 185.0 1,844 1,844 2,329 394.50 2,600 200.0 1,201 3,045 2,799 395.00 3,010 210.0 1,401 4,446 3,141 Device Routing Invert Outlet Devices #1 Device 2 394.00' 30.0" x 30.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 389.73' 12.0" Round Culvert L= 69.0' Ke= 0.500 Inlet/ Outlet Invert= 389.73' / 389.04' S= 0.0100 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=7.35 cfs @ 12.02 hrs HW=394.59' TW=388.02' (Dynamic Tailwater) L2=Culvert (Barrel Controls 7.35 cfs @ 9.36 fps) 4-1=Orifice/Grate (Passes 7.35 cfs of 14.89 cfs potential flow) Summary for Pond SMP-2: Bioretention Basin Inflow Area = 0.458 ac, 37.45% Impervious, Inflow Depth > 4.00" for 100YR event Inflow = 3.26 cfs @ 11.97 hrs, Volume= 0.153 of Outflow = 3.02 cfs @ 12.00 hrs, Volume= 0.138 af, Atten= 7%, Lag= 2.0 min Primary = 3.02 cfs @ 12.00 hrs, Volume= 0.138 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 387.88' @ 12.00 hrs Surf.Area= 1,683 sf Storage= 1,187 cf Plug-Flow detention time= 54.5 min calculated for 0.138 af(90% of inflow) Center-of-Mass det. time= 22.6 min ( 788.0 - 765.4 ) Volume Invert Avail.Storage Storage Description #1 387.00' 1,393 cf Custom Stage Data (Irregular)Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 387.00 1,030 180.0 0 0 1,030 387.50 1,390 190.0 603 603 1,339 388.00 1,780 200.0 790 1,393 1,664 Device Routing Invert Outlet Devices #1 Primary 387.50' 15.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=3.02 cfs @ 12.00 hrs HW=387.88' TW=386.36' (Dynamic Tailwater) 4-1=Orifice/Grate (Weir Controls 3.02 cfs @ 2.02 fps) POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 17 Summary for Pond SMP-3: Bioretention Basin Inflow Area = 0.458 ac, 17.44% Impervious, Inflow Depth > 3.49" for 100YR event Inflow = 2.92 cfs @ 11.97 hrs, Volume= 0.133 of Outflow = 2.84 cfs @ 11.99 hrs, Volume= 0.125 af, Atten= 3%, Lag= 1.4 min Primary = 2.84 cfs @ 11.99 hrs, Volume= 0.125 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 387.87' @ 11.99 hrs Surf.Area= 959 sf Storage= 634 cf Plug-Flow detention time= 34.0 min calculated for 0.125 af(94% of inflow) Center-of-Mass det. time= 13.1 min ( 789.0 - 775.8 ) Volume Invert Avail.Storage Storage Description #1 387.00' 768 cf Custom Stage Data (Irregular)Listed below (Recalc) Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 387.00 520 115.0 0 0 520 387.50 765 130.0 319 319 819 388.00 1,035 140.0 448 768 1,044 Device Routing Invert Outlet Devices #1 Device 2 387.50' 15.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 383.00' 12.0" Round Culvert L= 136.0' Ke= 0.500 Inlet/ Outlet Invert= 383.00' / 381.65' S= 0.0099 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.79 sf Primary OutFlow Max=2.78 cfs @ 11.99 hrs HW=387.86' TW=386.20' (Dynamic Tailwater) L2=Culvert (Passes 2.78 cfs of 3.59 cfs potential flow) 4-1=Orifice/Grate (Weir Controls 2.78 cfs @ 1.96 fps) Summary for Pond SMP-4: CDS-8 Inflow Area = 6.745 ac, 71.09% Impervious, Inflow Depth > 3.74" for 100YR event Inflow = 27.26 cfs @ 11.96 hrs, Volume= 2.104 af Outflow = 27.26 cfs @ 11.96 hrs, Volume= 2.104 af, Atten= 0%, Lag= 0.0 min Primary = 27.26 cfs @ 11.96 hrs, Volume= 2.104 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 384.83' @ 11.96 hrs Device Routing Invert Outlet Devices #1 Primary 380.55' 24.0" Round Culvert L= 70.0' Ke= 0.500 Inlet/ Outlet Invert= 380.55' / 380.22' S= 0.0047 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=26.59 cfs @ 11.96 hrs HW=384.71' TW=0.00' (Dynamic Tailwater) 4-1=Culvert (Barrel Controls 26.59 cfs @ 8.46 fps) POST-DEV Type II 24-hr 100YR Rainfall=6.20" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 18 Summary for Pond YD-6: 18" Inflow Area = 1.524 ac, 56.36% Impervious, Inflow Depth > 4.25" for 100YR event Inflow = 10.91 cfs @ 11.98 hrs, Volume= 0.539 of Outflow = 10.91 cfs @ 11.98 hrs, Volume= 0.539 af, Atten= 0%, Lag= 0.0 min Primary = 10.91 cfs @ 11.98 hrs, Volume= 0.539 of Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 386.36' @ 12.00 hrs Device Routing Invert Outlet Devices #1 Primary 381.50' 18.0" Round Culvert L= 96.0' Ke= 0.500 Inlet/ Outlet Invert= 381.50' / 380.88' S= 0.0065 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 1.77 sf Primary OutFlow Max=9.63 cfs @ 11.98 hrs HW=385.97' TW=384.59' (Dynamic Tailwater) 4-1=Culvert (Outlet Controls 9.63 cfs @ 5.45 fps) Summary for Link AP-1: AP-1 Inflow Area = 0.293 ac, 28.70% Impervious, Inflow Depth > 3.79" for 100YR event Inflow = 2.00 cfs @ 11.97 hrs, Volume= 0.093 af Primary = 2.00 cfs @ 11.97 hrs, Volume= 0.093 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Summary for Link AP-2: AP-2 Inflow Area = 30.681 ac, 39.55% Impervious, Inflow Depth > 3.84" for 100YR event Inflow = 127.87 cfs @ 12.00 hrs, Volume= 9.812 af Primary = 127.87 cfs @ 12.00 hrs, Volume= 9.812 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs WATER QUALITY EVENT POST-DEV Type 11 24-hr 90 Rainfall=0.71" Prepared by The LA Group Printed 11/25/2019 HydroCAD® 10.00-21 s/n 00439 ©2018 HydroCAD Software Solutions LLC Page 1 Summary for Pond SMP-4: CDS-8 Inflow Area = 6.745 ac, 71.09% Impervious, Inflow Depth > 0.17" for 90 event Inflow = 2.14 cfs @ 11.98 hrs, Volume= 0.096 of Outflow = 2.14 cfs @ 11.98 hrs, Volume= 0.096 af, Atten= 0%, Lag= 0.0 min Primary = 2.14 cfs @ 11.98 hrs, Volume= 0.096 af Routing by Dyn-Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 381.24' @ 11.98 hrs Device Routing Invert Outlet Devices #1 Primary 380.55' 24.0" Round Culvert L= 70.0' Ke= 0.500 Inlet/ Outlet Invert= 380.55' / 380.22' S= 0.0047 '/' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 3.14 sf Primary OutFlow Max=2.04 cfs @ 11.98 hrs HW=381.22' TW=0.00' (Dynamic Tailwater) 4-1=Culvert (Barrel Controls 2.04 cfs @ 3.28 fps) Attachment D Storm Data Job Name and# Skidmore College Athletic Expansion Minimum Runoff Reduction Volume 11/25/2019 RRv = [(P)(Rv*)(Ai)]/12 Where: Ai = (S)(Aic) Rv = 0.05 + 0.009(I)where I is 100%impervious Ai =impervious cover targeted for runoff reduction Aic = Total area of new impervious cover P = 90%rainfall (see Figure 4.1 in NYS Stormwater Management Design Manual) S =Hydrologic Soil Group (HSG) Specific Reduction Factor(S) A=0.55, B=0.40, C=0.30, D=0.20 S (HSG C) 0.30 Aic 1.28 acres Rv 0.95 90%Rainfall 1.15 Ai 0.385 RRv = 0.035 acre feet= 1,526 ft3 Stormwater Practice Sizing Job Name and# Skidmore College Athletic Expansion Water Quality Volume Calculation 11/6/2019 WQv=[(P)(Rv)(A)p12 Where: Rv=0.05+0.009(I) I=impervious cover in percent P=90%rainfall(see Figure 4.1 in NYS Stormwater Management Design Manual) A=Area in acres Proposed Bioretention Basin(SMP-1) %Impervious 80.16% Rv 0.77 90%Rainfall 1.15 Area in Square Feet 55234 WQv Required= 4083 fig 0.094 ac-ft Proposed Bioretention Basin(SMP-2) %Impervious 37.45% Rv 0.39 90%Rainfall 1.15 Area in Square Feet 19950 WQv Required= 740 ftp 0.017 ac-ft Proposed Bioretention Basin(SMP-3) %Impervious 17.44% Rv 0.21 90%Rainfall 1.15 Area in Square Feet 19950 WQv Required= 396 fig 0.009 ac-ft REQUIRED New Impervious %Impervious 100.00% Rv 0.95 90%Rainfall 1.15 Area in Square Feet 55887 WQv Required= 5088 If 0.117 ac-ft Existing Impervious Disturbed(75%Treatment) %Impervious 100.00% Rv 0.95 90%Rainfall 1.15 Area in Square Feet 62583 1.436708 WQv Calculated= 5698 ft3 0.131 ac-ft WQv Required= 4273 fe 0.098 ac-ft WQV TOTAL= 9361 ft' 0.215 ac-ft Job Name Skidmore College Athletic Expansion Channel Protection Volume Calculation Pre Development Step 1: Determine Qu P = 2.15 in. (1-yr. storm) Area= 30.974 acres CN= 82 **** Ia= 0.439 Ia/P= 0.20 Tc= 0.1 Hrs. Using Figure 4-I1, TR-55 and Tc, determine Qu(csm/in) Qu= 975 csm/in Step 2: Determine Qo/Qi Using Figure B-1, DEC Manual Appendix B for T=24 hrs. and Qu, determine Qo/Qi Qo/Qi = 0.02 Step 3: Determine Vs/Vr Vs/Vr= 0.682 - 1.43(Qo/Qi) + 1.64 (Qo/Qi)^2 - 0.804 (Qo/Qi)^3 Vs/Vr= 0.654 Step 4: Determine Qd Using Figure 2.1, TR-55 or SCS TR-16 and P, determine Qd(in of runoff) Qd= 0.9 in Step 5: Determine Cpv Area= 30.97 acres Cpv=Vs= (Vs/Vr) * Qd * A/12 Cpv= 1.519 ac-ft Cpv= 66185 ft3 Cpv Req: 66185 ft3 Job Name Skidmore College Athletic Expansion Channel Protection Volume Calculation Step 1: Determine Qu P = 2.15 in. (1-yr. storm) Area= 30.974 acres CN = 83 la= 0.410 Ia/P= 0.19 Tc= 0.1 Hrs. Using Figure 4-II, TR-55 and Tc,determine Qu(csm/in) Qu= 975 csm/in Step 2: Determine Qo/Qi Using Figure B-1,DEC Manual Appendix B for T=24 hrs. and Qu, determine Qo/Qi Qo/Qi= 0.02 Step 3: Determine Vs/Vr Vs/Vr= 0.682 - 1.43(Qo/Qi)+ 1.64(Qo/Qi)^2- 0.804(Qo/Qi)^3 Vs/Vr= 0.654 Step 4: Determine Qd Using Figure 2.1, TR-55 or SCS TR-16 and P, determine Qd(in of runoff) Qd= 0.95 in Step 5: Determine Cpv Area= 30.97 acres Cpv=Vs=(Vs/Vr) * Qd* A/12 Cpv= 1.604 ac-ft Cpv= 69862 ft3 Pre Dev 66185 ft3 CPv Required= 3677 ft3 Volume reduction achieved through green infrastructure SMP 1 = 4083 ft3 SMP 2= 740 ft3 SMP 3 = 396 ft4 P 2= 9640 ft3 Cpv Provided= 14859 ft3 Skidmore College Athletic Expansion 2016098 BIORETENTION WORKSHEET (See Section 6.4.4 of the NYSDEC Stormwater Management Design Manual 2015) Bioretention Area 1 1. Underlying soil permeability = in/hr (if no underdrains proposed, must infiltrate within 48 hours, HSG A and B Soils) 2. Calculate WQv: DA(maximum 5 acres) = 55,234 ft2 Percent Impervious Area, I = 80% % Rv= .05 + .009 ( 1 ) = 0.77 P (90% Rainfall) = 1.15 in. WQv= P Rv A/12 = 4,083 ft3 75% of WQv 3,063 ft' 3. Bioretention Details: Material Planting Soil Mix Filter bed depth (df) (2.5-4.0 ft) = 2.50 ft Coefficient of permeability of filter media (k) = 1.00 ft/day Avg. height of water above filter media (hf) (max. 0.5 ft) = 1.00 ft Design filter bed drain time (tf) = 2 days 4. Calculate required bioretention surface area (Af): Surface area A WQv x df k(hf+ df) (tf) Required Surface Area(Ar) = 1,458 ft2 5. Bioretention surface area provided = 1500 ft2 (design) 6. Water Quality Volume provided = 4200 ft3 (design) 7. Is Bioretention Basin Lined or in HSG C/D Soils Yes 8. Runoff Reduction Volume provided = 168C ft3 (design) BR-1 Attachment D Skidmore College Athletic Expansion 2016098 BIORETENTION WORKSHEET (See Section 6.4.4 of the NYSDEC Stormwater Management Design Manual 2015) Bioretention Area 2 1. Underlying soil permeability = in/hr (if no underdrains proposed, must infiltrate within 48 hours, HSG A and B Soils) 2. Calculate WQv: DA(maximum 5 acres) = 19,950 ft2 Percent Impervious Area, I = 37% % Rv= .05 + .009 ( 1 ) = 0.39 P (90% Rainfall) = 1.15 in. WQv = P Rv A/12 = 740 ft3 75% of WQv 555 ft' 3. Bioretention Details: Material Planting Soil Mix Filter bed depth (df) (2.5-4.0 ft) = 2.50 ft Coefficient of permeability of filter media (k) = 1.00 ft/day Avg. height of water above filter media (hf) (max. 0.5 ft) = 0.50 ft Design filter bed drain time (tf) = 2 days 4. Calculate required bioretention surface area (Af): Surface area A WQv x df k(hf+ df) (tf) Required Surface Area(Ar) = 308 ft2 5. Bioretention surface area provided = 1030 ft2 (design) 6. Water Quality Volume provided = 2472 ft3 (design) 7. Is Bioretention Basin Lined or in HSG C/D Soils Yes 8. Runoff Reduction Volume provided = 740 ft3 (design) BR-2 Attachment D Skidmore College Athletic Expansion 2016098 BIORETENTION WORKSHEET (See Section 6.4.4 of the NYSDEC Stormwater Management Design Manual 2015) Bioretention Area 3 1. Underlying soil permeability = in/hr (if no underdrains proposed, must infiltrate within 48 hours, HSG A and B Soils) 2. Calculate WQv: DA(maximum 5 acres) = 19,950 ft2 Percent Impervious Area, I = 17% % Rv= .05 + .009 ( 1 ) = 0.21 P (90% Rainfall) = 1.15 in. WQv= P Rv A/12 = 396 ft3 75% of WQv 297 ft' 3. Bioretention Details: Material Planting Soil Mix Filter bed depth (df) (2.5-4.0 ft) = 2.50 ft Coefficient of permeability of filter media (k) = 1.00 ft/day Avg. height of water above filter media (hf) (max. 0.5 ft) = 0.50 ft Design filter bed drain time (tf) = 2 days 4. Calculate required bioretention surface area (Af): Surface area A WQv x df k(hf+ df) (tf) Required Surface Area(Ar) = 165 ft2 5. Bioretention surface area provided = 520 ft2 (design) 6. Water Quality Volume provided = 1248 ft3 (design) 7. Is Bioretention Basin Lined or in HSG C/D Soils Yes 8. Runoff Reduction Volume provided = 396 ft3 (design) BR-3 Attachment D Appendix C Map Set Appendix D SWPPP Inspection Form Skidmore College Athletic Expansion—Skidmore College WEEKLY SWPPP INSPECTION REPORT Inspector Name: Date: Signature (required): Time: Weather: Inspection #: Soil Conditions (dry, saturated, etc): Note: Digital photos,with date stamp required for all practices requiring corrective action, before and after,to be attached to the inspection report. YES NO N/A 1. ❑ ❑ ❑ Routine Inspection. Date of last inspection: 2. Inspection following rain event. Date/time of storm ending: ❑ ❑ ❑ Rainfall amount: Recorded by: 3. ❑ ❑ ❑ Is this a final site inspection? 4. ❑ ❑ ❑ Has site undergone final stabilization? ❑ ❑ ❑ If so, have all temporary erosion and sediment controls been removed? Site Disturbance (Indicate Locations on Plan) YES NO N/A 1. ❑ ❑ ❑ Areas previously disturbed, but have not undergone active site work in the last 14 days? 2. ❑ ❑ ❑ Areas disturbed within last 14 days? 3. ❑ ❑ ❑ Areas expected to be disturbed in next 14 days? 4. ❑ ❑ ❑ Do areas of steep slopes or complex stabilization issues exist? If"YES" explain: 5. ❑ ❑ ❑ Are there currently more than 5 acres of disturbed soil at the site? If so make sure there is an approval letter from NYS DEC. Additional Comments: Inspection of Erosion and Sediment Control Devices Type of Control Device Accumulation (if any) in % Repairs/Maintenance Needed 1. 2. 3. 4. 5. 6. Stabilization/Runoff YES NO N/A 1. ❑ ❑ ❑ Are all existing disturbed areas contained by control devices? Type of devices: 2. ❑ ❑ ❑ Are there areas that require stabilization within the next 14 days? Specify Area: 3. ❑ ❑ ❑ Have stabilization measures been initiated in inactive areas? 4. ❑ ❑ ❑ Is there current snow cover or frozen ground conditions? 5. ❑ ❑ ❑ Rills or gullies? 6. ❑ ❑ ❑ Slumping/deposition? 7. ❑ ❑ ❑ Loss of vegetation? 8. ❑ ❑ ❑ Lack of germination? 9. 0 0 0 Loss of mulching? Receiving Structures/Water Bodies (Indicate locations where runoff leaves the project site on the site plan) YES NO N/A 1. ❑ ❑ ❑ Surface water swale or natural surface waterbody? If natural waterbody: Is waterbody located ❑ onsite, or❑ adjacent to property boundary? Description of condition: 2. ❑ ❑ ❑ Municipal or community system? Inspect locations where runoff from project site enters the receiving waters and indicate if there is evidence of: a. ❑ ❑ ❑ Rills or gullies? b. ❑ ❑ ❑ Slumping/deposition? c. ❑ ❑ ❑ Loss of vegetation? d. ❑ ❑ ❑ Undermining of structures? e. ❑ ❑ ❑ Was there a discharge into the receiving water on the day of inspection? f. ❑ ❑ ❑ Is there evidence of turbidity, sedimentation, or oil in the receiving waters? Additional Comments: Inspection of Post-Construction Stormwater Management Control Devices Type of Control Device Phase of Construction Repairs/Maintenance Needed 1. 2. 3. 4. General Site Condition YES NO N/A 1. ❑ ❑ ❑ Have action items from previous reports been addressed? 2. ❑ ❑ ❑ Does routine maintenance of protection components occur on a regular basis? 3. ❑ ❑ ❑ Does cleaning and/or sweeping affected roadways occur, at minimum, daily? 4. ❑ ❑ ❑ Is debris and litter removed on a monthly basis, or as necessary? 5. ❑ ❑ ❑ Is the site maintained in an orderly manner? Describe the condition of all natural waterbodies within or adjacent to the Project that receive runoff from the site: Contractors progress over last 7 days: Anticipated work to be begun in the next 7 days: Additional Comments: Visual Observations YES NO N/A 1. ❑ ❑ ❑ All erosion and sediment control measures have been installed/constructed? 2. ❑ ❑ ❑ All erosion and sediment control measures are being maintained properly? SUMMARY OF ACTION ITEMS TO REPAIR/REPLACE/MAINTAIN/CORRECT DEFICIENCIES Action Reported To (no signature required): Company: Appendix E Other SWPPP Forms Construction Sequence SWPPP Plan Changes Spill Response Form Stormwater Management Practice Maintenance Log The operator shall prepare a summary of construction status using the Construction Sequence Form below once every month. Significant deviations to the sequence and reasons for those deviations (i.e. weather, subcontractor availability, etc.), shall be noted by the contractor. The schedule shall be used to record the dates for initiation of construction, implementation of erosion control measures, stabilization, etc. A copy of this table will be maintained at the construction site and updated in addition to the individual Inspection Reports completed for each inspection. Construction Sequence Form Construction Activities Date (Identify name of planned practices) Complete 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. STORM WATER POLLUTION PREVENTION PLAN PLAN CHANGES, AUTHORIZATION, AND CHANGE CERTIFICATION CHANGES REQUIRED TO THE POLLUTION PREVENTION PLAN: REASONS FOR CHANGES: REQUESTED BY: DATE: AUTHORIZED BY: DATE: CERTIFICATION OF CHANGES: I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that false statements made herein are punishable as a Class A misdemeanor pursuant to Section 210.45 of the penal code. SIGNATURE: DATE: SPILL RESPONSE REPORT Within 1 hour of a spill discovery less than 2 gallons in volume the following must be notified: Dan Rodecker (518) 580 5860 x 5874 Within 1 hour of a spill discovery greater than 2 gallons the following must be notified: Dan Rodecker NYSDEC Spill Response Hotline 1-800-457-7362 Spill Response Contractor Material Spilled: Approximate Volume: Location: Distance to nearest down gradient drainage: Distance to nearest down gradient open water: Temporary control measures in place: Appendix F SPDES General Permit GP-0-15-002 r_ct7tEW YORK Department of ovrenillr,ur Environmental Conservation PREFACE NEW YORK STATE Pursuant to Section 402 of the Clean Water Act("CWA"),stormwater discharges DEPARTMENT OF ENVIRONMENTAL CONSERVATION from certain construction activities are unlawful unless they are authorized by a National SPDES GENERAL.PERMIT Pollutant Discharge Elimination System(`NPDES)permit or by a state permit program. FOR STORMWATER DISCHARGES New York's State Pollutant Discharge Elimination System("SPDES)is a N PDES- approved program with permits issued in accordance with the Environmental From Conservation Law("ECU). CONSTRUCTION ACTIVITY This general permit("permit")is issued pursuant to Article 17,Titles 7,8 and Article 70 of the ECL.An owner or operator may obtain coverage under this permit by Permit Na.GP-0.15-002 submitting a Notice of Intent(NOV)" " to the Department Copies of this permit and the NOI for New York are available by calling(518)402-8109 or at any New York State Department of Environmental Conservation("the Department')regional office(see Issued Pursuant to Article 17,Titles 7,8 and Article 70 Appendix G).They are also available on the Department's website at: of the Environmental Conservation Law http.//www.dec.nv.aov/ An owner or operator of a construction activity that is eligible for coverage under this permit must obtain coverage prior to the commencement of construction activity. Effective Date:January 29,2015 Expiration Date:January 28,2020 Activities that fit the definition of"construction activity',as defined under 40 CFR 122.26(b)(14)(x),(15)(i),and(15)(ii),constitute construction of a point source and Modification Date. therefore,pursuant to Article 17-0505 of the ECL,the owner or operator must have July 14,2015—Correction of typographical error in definition of"New Development", coverage under a SPDES permit prior to commencing construction activity.They cannot Appendix A wait until there is an actual discharge from the construction site to obtain permit coverage. *Note:The italicized words/phrases within this permit are defined in Appendix A. John J.Ferguson Chief Permit Administrator --�- 7-/s"-/s uif or'rx Signatu Date Address: NYS DEC Division of Environmental Permits 625 Broadway,4th Floor Albany,N.Y. 12233-1750 NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION Q. Penalties for Falsification of Forms and Reports 36 SPDES GENERAL PERMIT FOR STORMWATER DISCHARGES R. Other Permits 36 FROM CONSTRUCTION ACTIVITIES APPENDIX A 37 APPENDIX B 44 Part I.PERMIT COVERAGE AND LIMITATIONS 1 APPENDIX C 46 A. Permit Application 1 APPENDIX 52 B. Effluent Limitations Applicable to Discharges from Construction Activities 1 APPENDIX E 53 C. Post-construction Stormwater Management Practice Requirements 4 APPENDIX F 55 D. Maintaining Water Quality 8 E. Eligibility Under This General Permit 9 F. Activities Which Are Ineligible for Coverage Under This General Permit 9 Part II. OBTAINING PERMIT COVERAGE 12 A. Notice of Intent(NOI)Submittal 12 B. Permit Authorization 13 C. General Requirements For Owners or Operators With Permit Coverage 15 D. Permit Coverage for Discharges Authorized Under GP-0-10-001 17 E. Change of Owner or Operator 17 Part III.STORM WATER POLLUTION PREVENTION PLAN(SWPPP) 18 A. General SWPPP Requirements 18 B. Required SWPPP Contents 20 C. Required SWPPP Components by Project Type 23 Part IV.INSPECTION AND MAINTENANCE REQUIREMENTS 24 A. General Construction Site Inspection and Maintenance Requirements 24 B. Contractor Maintenance Inspection Requirements 24 C. Qualified Inspector Inspection Requirements 24 Part V.TERMINATION OF PERMIT COVERAGE 28 A. Termination of Permit Coverage 28 Part VI.REPORTING AND RETENTION OF RECORDS 30 A. Record Retention 30 B. Addresses 30 Part VII. STANDARD PERMIT CONDITIONS 31 A. Duty to Comply 31 B. Continuation of the Expired General Permit 31 C. Enforcement 31 D. Need to Halt or Reduce Activity Not a Defense 31 E. Duty to Mitigate 32 F. Duty to Provide Information 32 G. Other Information 32 H. Signatory Requirements 32 I. Property Rights 34 J. Severability 34 K. Requirement to Obtain Coverage Under an Alternative Permit 34 L. Proper Operation and Maintenance 35 M. Inspection and Entry 35 N. Permit Actions 36 O. Definitions 36 P. Re-Opener Clause 36 (Part I) (Part I.B.1) Part I.PERMIT COVERAGE AND LIMITATIONS which demonstrates that the deviation or alternative design is equivalent to the technical standard. A.Permit Application This permit authorizes stormwater discharges to surface waters of the State from a.Erosion and Sediment Controls.Design,install and maintain effective the following construction activities identified within 40 CFR Parts 122.26(b)(14)(x), erosion and sediment controls to minimize the discharge of pollutants and 122.26(b)(15)(i)and 122.26(b)(15)(ii),provided all of the eligibility provisions of this prevent a violation of the water quality standards.At a minimum,such permit are met: controls must be designed,installed and maintained to: 1. Construction activities involving soil disturbances of one(1)or more acres; (i) Minimize soil erosion through application of runoff control and soil including disturbances of less than one acre that are part of a larger stabilization control measure to minimize pollutant discharges; common plan of development or sale that will ultimately disturb one or more acres of land;excluding routine maintenance activity that is performed to (ii) Control stormwater discharges to minimize channel and maintain the original line and grade,hydraulic capacity or original purpose streambank erosion and scour in the immediate vicinity of the of a facility; discharge points; 2. Construction activities involving soil disturbances of less than one(1)acre (iii) Minimize the amount of soil exposed during construction activity, where the Department has determined that a SPDES permit is required for stormwater discharges based on the potential for contribution to a violation (iv) Minimize the disturbance of steep slopes; of a water quality standard or for significant contribution of pollutants to surface waters of the State. (v) Minimize sediment discharges from the site; 3. Construction activities located in the watershed(s)identified in Appendix D (vi) Provide and maintain natural buffers around surface waters,direct pP stormwater to vegetated areas and maximize stormwater that involve soil disturbances between five thousand(5,000)square feet infiltration to reduce pollutant discharges,unless infeasible; and one(1)acre of land. (vii) Minimize soil compaction. Minimizing soil compaction is not requB.Effluent Limitations Applicable to Discharges from Construction Activities dictates that where be the intended function of a specific area of the site Discharges authorized by this permit must achieve, at a minimum,the effluent dictates it compacted;and limitations in Part l.B.1.(a)—(f)of this permit.These limitations represent the degree (viii)Unless infeasible, preserve a sufficient amount of topsoil to of effluent reduction attainable by the application of best practicable technology complete soil restoration and establish a uniform, dense currently available._ vegetative cover. 1, Erosion and Sediment Control Requirements-The owner or operator must b.Soil Stabilization.In areas where soil disturbance activity has temporarily select, design, install, implement and maintain control measures to or permanently ceased,the application of soil stabilization measures must minimize the discharge of pollutants and prevent a violation of the water be initiated by the end of the next business day and completed within quality standards.The selection,design,installation,implementation,and fourteen (14)days from the date the current soil disturbance activity maintenance of these control measures must meet the non-numeric effluent ceased.For construction sites that directly discharge to one of the 303(d) limitations in Part I.B.1.(a)—(f)of this permit and be in accordance with the segments listed in Appendix E or is located in one of the watersheds listed New York State Standards and Specifications for Erosion and Sediment in Appendix C,the application of soil stabilization measures must be Control,dated August 2005, using sound engineering judgment.Where initiated by the end of the next business day and completed within seven control measures are not designed in conformance with the design criteria (7)days from the date the current soil disturbance activity ceased.See included in the technical standard,the owner or operator must include in Appendix A for definition of Temporarily Ceased. the Stormwater Pollution Prevention Plan("SWPPP")the reason(s)for the deviation or alternative design and provide information c.Dewatering.Discharges from dewatering activities,including discharges 1 2 (Part I.B.1.c) (Part I.B.1.f) from dewatering of trenches and excavations, must be managed by at or below the outlet does not occur. appropriate control measures. C.Post-construction Stormwater Management Practice Requirements d.Pollution Prevention Measures. Design, install, implement, and maintain effective pollution prevention measures to minimize the 1, The owner or operator of a construction activity that requires post- discharge of pollutants and prevent a violation of the water quality construction stormwater management practices pursuant to Part III.C.of standards.At a minimum,such measures must be designed,installed, this permit must select,design,install,and maintain the practices to meet implemented and maintained to: the performance criteria in the New York State Stormwater Management Design Manual ("Design Manual"), dated January 2015, using sound (i) Minimize the discharge of pollutants from equipment and vehicle engineering judgment.Where post-construction stormwater management washing,wheel wash water,and other wash waters.This applies to practices("SMPs")are not designed in conformance with the performance washing operations that use clean water only.Soaps,detergents criteria in the Design Manual,the owner or operator must include in the and solvents cannot be used; SWPPP the reason(s)for the deviation or alternative design and provide information which demonstrates that the deviation or alternative design is (ii) Minimize the exposure of building materials, building products, equivalent to the technical standard. construction wastes, trash, landscape materials, fertilizers, pesticides, herbicides, detergents, sanitary waste and other 2. The owner or operator of a construction activity that requires post- materials present on the site to precipitation and to stormwater. construction stormwater management practices pursuant to Part III.C.of Minimization of exposure is not required in cases where the this permit must design the practices to meet the applicable sizing criteria exposure to precipitation and to stormwater will not result in a in Part I.C.2.a.,b.,c.or d.of this permit discharge of pollutants,or where exposure of a specific material or product poses little risk of stormwater contamination(such as final products and materials intended for outdoor use);and a. Sizing Criteria for New Development (iii) Prevent the discharge of pollutants from spills and leaks and (i) Runoff Reduction Volume("RRv"): Reduce the total Water Quality implement chemical spill and leak prevention and response Volume ("WQv") by application of RR techniques and standard procedures. SMPs with RRv capacity.The total WQv shall be calculated in accordance with the criteria in Section 4.2 of the Design Manual. e.Prohibited Discharges.The following discharges are prohibited: (ii) Minimum RRv and Treatment of Remaining Total WQv: (i) Wastewater from washout of concrete; Construction activities that cannot meet the criteria in Part I.C.2.a.(i)of this permit due to site limitations shall direct runoff (ii) Wastewater from washout and cleanout of stucco, paint,form from all newly constructed impervious areas to a RR technique or release oils,curing compounds and other construction materials; standard SMP with RRv capacity unless infeasible.The specific site limitations that prevent the reduction of 100%of the WQv shall (iii) Fuels,oils,or other pollutants used in vehicle and equipment be documented in the SWPPP.For each impervious area that is operation and maintenance; not directed to a RR technique or standard SMP with RRv capacity, the SWPPP must include documentation which (iv) Soaps or solvents used in vehicle and equipment washing;and demonstrates that all options were considered and for each option explains why it is considered infeasible. (v) Toxic or hazardous substances from a spill or other release. In no case shall the runoff reduction achieved from the newly f. Surface Outlets.When discharging from basins and impoundments,the constructed impervious areas be less than the Minimum RRv outlets shall be designed,constructed and maintained in such a manner as calculated using the criteria in Section 4.3 of the Design that sediment does not leave the basin or impoundment and that erosion Manual.The remaining portion of the total WQv 3 4 (Part I.C.2.a.ii) (Part I.C.2.b.ii) that cannot be reduced shall be treated by application of standard standard SMP with RRv capacity unless infeasible.The specific SMPs. site limitations that prevent the reduction of 100%of the WQv shall be documented in the SWPPP.For each impervious area that is (iii) Channel Protection Volume("Cpv"): Provide 24 hour extended not directed to a RR technique or standard SMP with RRv detention of the post-developed 1-year, 24-hour storm event; capacity, the SWPPP must include documentation which remaining after runoff reduction.The Cpv requirement does not demonstrates that all options were considered and for each option apply when: explains why it is considered infeasible. (1)Reduction of the entire Cpv is achieved by application of runoff reduction techniques or infiltration systems,or In no case shall the runoff reduction achieved from the newly constructed impervious areas be less than the Minimum RRv (2)The site discharges directly to tidal waters,or fifth order or as calculated using the criteria in Section 10.3 of the Design larger streams. Manual.The remaining portion of the total WQv that cannot be (iv) Overbank Flood Control Criteria ("Qp"): Requires storage to reduced shall be treated by application of standard SM Ps. attenuate the post-development 10-year,24-hour peak discharge (iii) Channel Protection Volume (Cpv): Provide 24 hour extended rate(Qp)to predevelopment rates.The Qp requirement does not detention of the post-developed 1-year, 24-hour storm event; apply when: remaining after runoff reduction.The Cpv requirement does not (1)the site discharges directly to tidal waters or fifth order or larger streams,or apply when: (2)A downstream analysis reveals that overbank control is not (1)Reduction of the entire Cpv is achieved by required. application of runoff reduction techniques or infiltration systems,or (v) Extreme Flood Control Criteria ("Qf"): Requires storage to (2)The site discharges directly to tidal waters,or fifth attenuate the post-development 100-year, 24-hour peak discharge rate(Qf)to predevelopment rates.The Qf requirement order or larger streams. does not apply when: (iv) Overbank Flood Control Criteria (Qp): Requires storage to (1)the site discharges directly to tidal waters or fifth order or attenuate the post-development 10-year,24-hour peak discharge larger streams,or rate(Qp)to predevelopment rates.The Qp requirement does not (2)A downstream analysis reveals that overbank control is not apply when: required. (1)the site discharges directly to tidal waters or fifth b.Sizing Criteria for New Development in Enhanced Phosphorus order or larger streams,or Removal Watershed (2)A downstream analysis reveals that overbank control is not required. (i) Runoff Reduction Volume(RRv): Reduce the total Water Quality (v) Extreme Flood Control Criteria(Qf):Requires storage to attenuate Volume (WQv) by application of RR techniques and standard the post-development 100-year,24-hour peak discharge rate(Qf) SM Ps with RRv capacity.The total WQv is the runoff volume from the 1-year, 24 hour design storm over the post-developed to predevelopment rates.The Qf requirement does not apply watershed and shall be calculated in accordance with the criteria when: in Section 10.3 of the Design Manual. (1)the site discharges directly to tidal waters or fifth order or larger streams,or (ii) Minimum RRv and Treatment of Remaining Total WQv: (2)A downstream analysis reveals that overbank control Construction activities that cannot meet the criteria in Part is not required. I.C.2.b.(i)of this permit due to site limitations shall direct runoff from all newly constructed impervious areas to a RR technique or c.Sizing Criteria for Redevelopment Activity 5 6 (Part I.C.2.c.i) (Part I.C.2.c.iv) (i) Water Quality Volume (WQv):The WQv treatment objective for (iv) Extreme Flood Control Criteria(Qf):Not required if there are no redevelopment activity shall be addressed by one of the following changes to hydrology that increase the discharge rate from the options. Redevelopment activities located in an Enhanced project site. Phosphorus Removal Watershed(see Part III.B.3.and Appendix C of this permit)shall calculate the WQv in accordance with Section d.Sizing Criteria for Combination of Redevelopment Activity and New 10.3 of the Design Manual.All other redevelopment activities shall Development calculate the WQv in accordance with Section 4.2 of the Design Manual. Construction projects that include both New Development and Redevelopment Activity shall provide post-construction (1)Reduce the existing impervious cover by a minimum stormwater management controls that meet the sizing criteria of 25%of the total disturbed,impervious area.The calculated as an aggregate of the Sizing Criteria in Part I.C.2.a. Soil Restoration criteria in Section 5.1.6 of the Design or b.of this permit for the New Development portion of the Manual must be applied to all newly created pervious project and Part I.C.2.c of this permit for Redevelopment areas,or Activity portion of the project. (2)Capture and treat a minimum of 25%of the WQv from the disturbed,impervious area by the application of D.Maintaining Water Quality standard SM Ps;or reduce 25% of the WQv from the The Department expects that compliance with the conditions of this permit will disturbed,impervious area by the application of RR control discharges necessary to meet applicable water quality standards.It shall be techniques or standard SM Ps with RRv capacity.,or a violation of the ECL for any discharge to either cause or contribute to a violation (3)Capture and treat a minimum of 75%of the WQv from of water quality standards as contained in Parts 700 through 705 of Title 6 of the the disturbed, impervious area as well as any Official Compilation of Codes,Rules and Regulations of the State of New York,such additional runoff from tributary areas by application of as: the alternative practices discussed in Sections 9.3 and 9.4 of the Design Manual.,or 1. There shall be no increase in turbidity that will cause a substantial visible (4)Application of a combination of 1,2 and 3 above that contrast to natural conditions; provide a weighted average of at least two of the above methods.Application of this method shall be 2. There shall be no increase in suspended,colloidal or settleable solids that in accordance with the criteria in Section 9.2.1(B)(IV) will cause deposition or impair the waters for their best usages;and of the Design Manual. 3• There shall be no residue from oil and floating substances,nor visible oil If there is an existing post-construction stormwater management film,nor globules of grease. practice located on the site that captures and treats runoff from the impervious area that is being disturbed,the WQv treatment option selected must, at a minimum, provide treatment equal to the If there is evidence indicating that the stormwater discharges authorized by this treatment that was being provided by the existing practice(s)if that permit are causing,have the reasonable potential to cause,or are contributing to a treatment is greater than the treatment required by options 1—4 violation of the water quality standards;the owner or operator must take appropriate above. corrective action in accordance with Part IV.C.5.of this general permit and document in accordance with Part IV.C.4.of this general permit.To address the water quality (ii) Channel Protection Volume(Cpv): Not required if there are no standard violation the owner or operator may need to provide additional information, changes to hydrology that increase the discharge rate from the include and implement appropriate controls in the SWPPP to correct the problem, project site. or obtain an individual SPDES permit. If there is evidence indicating that despite compliance with the terms and conditions (iii) Overbank Flood Control Criteria(Qp):Not required if there are no of this general permit it is demonstrated that the stormwater discharges authorized changes to hydrology that increase the discharge rate from the project site. by this permit are causing or contributing to a violation of water quality standards,or 7 8 (Part I.D) (Part I.F) if the Department determines that a modification of the permit is necessary to prevent a violation of water quality standards,the authorized discharges will no 1. Discharges after construction activities have been completed and the site longer be eligible for coverage under this permit. The Department may require the has undergone final stabilization; owner or operator to obtain an individual SPDES permit to continue discharging. 2. Discharges that are mixed with sources of non-stormwater other than those E.Eligibility Under This General Permit expressly authorized under subsection E.3.of this Part and identified in the SWPPP required by this permit; 1. This permit may authorize all discharges of stormwater from construction activity to surface waters of the State and groundwaters except for ineligible 3. Discharges that are required to obtain an individual SPDES permit or discharges identified under subparagraph F.of this Part. another SPDES general permit pursuant to Part VI I.K.of this permit; 4, Construction activities or discharges from construction activities that may 2. Except for non-stormwater discharges explicitly listed in the next paragraph, adversely affect an endangered or threatened species unless the owner or this permit only authorizes stormwater discharges from construction operator has obtained a permit issued pursuant to 6 NYCRR Part 182 for activities. the project or the Department has issued a letter of non-jurisdiction for the project.All documentation necessary to demonstrate eligibility shall be maintained on site in accordance with Part II.C.2 of this permit. 3. Notwithstanding paragraphs E.1 and E.2 above, the following non- stormwater discharges may be authorized by this permit:discharges from 5. Discharges which either cause or contribute to a violation of water quality firefighting activities;fire hydrant flushings;waters to which cleansers or standards adopted pursuant to the ECL and its accompanying regulations; other components have not been added that are used to wash vehicles or control dust in accordance with the SWPPP, routine external building 6. Construction activities for residential,commercial and institutional projects: washdown which does not use detergents;pavement washwaters where a.Where the discharges from the construction activities are tributary to spills or leaks of toxic or hazardous materials have not occurred(unless all waters of the state classified as AA or AA-s;and spilled material has been removed)and where detergents are not used;air conditioning condensate; uncontaminated groundwater or spring water; b.Which disturb one or more acres of land with no existing impervious cover, uncontaminated discharges from construction site de-watering operations; and and foundation or footing drains where flows are not contaminated with process materials such as solvents.For those entities required to obtain c.Which are undertaken on land with a Soil Slope Phase that is identified as coverage under this permit,and who discharge as noted in this paragraph, an E or F,or the map unit name is inclusive of 25%or greater slope,on and with the exception of flows from firefighting activities,these discharges the United States Department of Agriculture(USDA")Soil Survey for the must be identified in the SWPPP.Under all circumstances,the owner or County where the disturbance will occur. operator must still comply with water quality standards in Part I.D of this permit. 7. Construction activities for linear transportation projects and linear utility projects: 4. The owner or operator must maintain permit eligibility to discharge under a.Where the discharges from the construction activities are tributary to this permit. Any discharges that are not compliant with the eligibility waters of the state classified as AA or AA-s;and conditions of this permit are not authorized by the permit and the owner or operator must either apply for a separate permit to cover those ineligible b.Which disturb two or more acres of land with no existing impervious cover, discharges or take steps necessary to make the discharge eligible for and coverage. F.Activities Which Are Ineligible for Coverage Under This General Permit c.Which are undertaken on land with a Soil Slope Phase that is identified as All of the following are not authorized by this permit an E or F,or the map unit name is inclusive of 25%or greater slope,on the USDA Soil Survey for the County where the disturbance will occur. 9 10 (Part I.F.8) (Part I.F.8.c.iii) (iii) Executed Memorandum of Agreement,or 6. Construction activities that have the potential to affect an historic properly, unless there is documentation that such impacts have been resolved.The d.Documentation that: following documentation necessary to demonstrate eligibility with this (i) SHPA Section 14.09 has been completed by NYS DEC or another requirement shall be maintained on site in accordance with Part II.C.2 of state agency. this permit and made available to the Department in accordance with Part VII.F of this permit: 9. Discharges from construction activities that are subject to an existing SPDES individual or general permit where a SPDES permit for construction a.Documentation that the construction activity is not within an activity has been terminated or denied;or where the owner or operator has archeologically sensitive area indicated on the sensitivity map,and that failed to renew an expired individual permit. the construction activity is not located on or immediately adjacent to a property listed or determined to be eligible for listing on the National or State Registers of Historic Places,and that there is no new permanent Part II. OBTAINING PERMIT COVERAGE building on the construction site within the following distances from a building,structure,or object that is more than 50 years old,or if there is A.Notice of Intent(NOI)Submittal such a new permanent building on the construction site within those parameters that NYS Office of Parks, Recreation and Historic 1. An owner or operator of a construction activity that is not subject to the Preservation(OPRHP),a Historic Preservation Commission of a Certified requirements of a regulated, traditional land use control MS4 must first Local Government, or a qualified preservation professional has prepare a SWPPP in accordance with all applicable requirements of this determined that the building,structure,or object more than 50 years old permit and then submit a completed NOI form to the Department in order to is not historically/archeologically significant. be authorized to discharge under this permit.An owner or operator shall use either the electronic (eNOI) or paper version of the NOI that the • 1-5 acres of disturbance-20 feet Department prepared. Both versions of the NOI are located on the • 5-20 acres of disturbance-50 feet Department's website(http://www.dec.ny.gov/).The paper version of the • 20+acres of disturbance-100 feet,or NOI shall be signed in accordance with Part VII.H. of this permit and submitted to the following address. b.DEC consultation form sent to OPRHP,and copied to the NYS DEC Agency Historic Preservation Officer(APO),and (i) the State Environmental Quality Review(SEQR)Environmental NOTICE OF INTENT Assessment Form (EAF) with a negative declaration or the NYS DEC,Bureau of Water Permits Findings Statement,with documentation of OPRHP's agreement 625 Broadway,4th Floor with the resolution;or Albany,New York 12233-3505 (ii) documentation from OPRHP that the construction activity will result in No Impact;or 2. An owner or operator of a construction activity that is subject to the (iii) documentation from OPRHP providing a determination of No requirements of a regulated, traditional land use control MS4 must first Adverse Impact;or prepare a SWPPP in accordance with all applicable requirements of this (iv) a Letter of Resolution signed by the owner/operator,OPRHP and permit and then have its SWPPP reviewed and accepted by the regulated, the DEC APO which allows for this construction activity to be traditional land use control MS4 prior to submitting the NOI to the eligible for coverage under the general permit in terms of the State Department. The owner or operator shall have the "MS4 SWPPP Historic Preservation Act(SH PA);or Acceptance"form signed in accordance with Part VII.H.,and then submit that form along with a completed NOI to the Department.An owner or c.Documentation of satisfactory compliance with Section 106 of the operator shall use either the electronic(eNOI)or paper version of the NOI. National Historic Preservation Act for a coterminous project area: (i) No Affect The paper version of the NOI shall be signed in accordance with Part VII.H. (ii) No Adverse Affect of this permit and submitted to the address in Part II.A.1. 11 12 (Part II.A.2) (Part II.B.3) The requirement for an owner or operator to have its SWPPP reviewed and will be authorized to discharge stormwater from their construction activity in accepted by the MS4 prior to submitting the NOI to the Department does accordance with the following schedule: not apply to an owner or operator that is obtaining permit coverage in accordance with the requirements in Part II.E. (Change of Owner or a.For construction activities that are not subject to the requirements of a Operator)or where the owner or operator of the construction activity is the regulated,traditional land use control MS4: regulated,traditional land use control MS4. (i) Five(5)business days from the date the Department receives a 3, The owner or operator shall have the SWPPP preparer sign the"SWPPP complete electronic version of the NOI (eNOI) for construction Preparer Certification"statement on the NOI prior to submitting the form to activities with a SWPPP that has been prepared in conformance the Department. with the design criteria in the technical standard referenced in Part III.B.1 and the performance criteria in the technical standard referenced in Parts III.B., 2 or 3, for construction activities that 4, As of the date the NOI is submitted to the Department,the owner or operator require post-construction stormwater management practices shall make the NOI and SWPPP available for review and copying in pursuant to Part III.C.;or accordance with the requirements in Part VII.F.of this permit. (ii) Sixty(60)business days from the date the Department receives a B.Permit Authorization complete NOI (electronic or paper version) for construction activities with a SWPPP that has not been prepared in 1. An owner or operator shall not commence construction activity until their conformance with the design criteria in technical standard authorization to discharge under this permit goes into effect referenced in Part I I I.B.1.or,for construction activities that require 2, Authorization to discharge under this permit will be effective when the owner post-construction stormwater management practices pursuant to or operator has satisfied all of the following criteria: Part III.C., the performance criteria in the technical standard referenced in Parts III.B.,2 or 3,or; a.project review pursuant to the State Environmental Quality Review Act (iii) Ten(10)business days from the date the Department receives a ("SEQRA") have been satisfied,when SEQRA is applicable. See the complete paper version of the NOI for construction activities with Departments website(http:/hvww.dec.nv.aov/)for more information, a SWPPP that has been prepared in conformance with the design b.where required,all necessary Department permits subject to the Uniform criteria in the technical standard referenced in Part III.B.1 and the Procedures Act("UPA)(see 6 NYCRR Part 621)have been obtained, performance criteria in the technical standard referenced in Parts unless otherwise notified by the Department pursuant to 6 NYCRR III.B., 2 or 3, for construction activities that require post- 621.3(a)(4). Owners or operators of construction activities that are construction stormwater management practices pursuant to Part required to obtain UPA permits must submit a preliminary SWPPP to the III.C. appropriate DEC Permit Administrator at the Regional Office listed in b.For construction activities that are subject to the requirements of a Appendix F at the time all other necessary UPA permit applications are regulated,traditional land use control MS4: submitted.The preliminary SWPPP must include sufficient information to demonstrate that the construction activity qualifies for authorization under (i) Five(5)business days from the date the Department receives both this permit, a complete electronic version of the NOI(eNOI)and signed"MS4 c.the final SWPPP has been prepared,and SWPPP Acceptance"form,or d.a complete NOI has been submitted to the Department in accordance with (ii) Ten(10)business days from the date the Department receives the requirements of this permit both a complete paper version of the NOI and signed "MS4 SWPPP Acceptance"form. 3. An owner or operator that has satisfied the requirements of Part II.B.2 above 4. The Department may suspend or deny an owner's or operator's coverage 13 14 (Part II.B.4) (Part II.C.3.a) under this permit if the Department determines that the SWPPP does not have a qualified inspector conduct at least two(2)site inspections in meet the permit requirements.In accordance with statute,regulation,and accordance with Part IV.C.of this permit every seven(7)calendar days, the terms and conditions of this permit,the Department may deny coverage for as long as greater than five(5)acres of soil remain disturbed.The under this permit and require submittal of an application for an individual two(2)inspections shall be separated by a minimum of two(2)full SPDES permit based on a review of the NOI or other information pursuant calendar days. to Part II. b.In areas where soil disturbance activity has temporarily or permanently ceased,the application of soil stabilization measures must be initiated by 5. Coverage under this permit authorizes stormwater discharges from only the end of the next business day and completed within seven(7)days those areas of disturbance that are identified in the NOI.If an owner or from the date the current soil disturbance activity ceased. The soil operator wishes to have stormwater discharges from future or additional stabilization measures selected shall be in conformance with the technical areas of disturbance authorized, they must submit a new NOI that standard,New York State Standards and Specifications for Erosion and addresses that phase of the development,unless otherwise notified by the Sediment Control,dated August 2005. Department. The owner or operator shall not commence construction activity on the future or additional areas until their authorization to discharge c.The owner or operator shall prepare a phasing plan that defines maximum under this permit goes into effect in accordance with Part I I.B.of this permit. disturbed area per phase and shows required cuts and fills. d.The owner or operator shall install any additional site specific practices C.General Requirements For Owners or Operators With Permit Coverage needed to protect water quality. 1. The owner or operator shall ensure that the provisions of the SWPPP are e.The owner or operator shall include the requirements above in their implemented from the commencement of construction activity until all areas SWPPP of disturbance have achieved final stabilization and the Notice of Termination("NOT")has been submitted to the Department in accordance 4. In accordance with statute,regulations,and the terms and conditions of this with Part V.of this permit.This includes any changes made to the SWPPP permit,the Department may suspend or revoke an owner's or operator's pursuant to Part III.A.4.of this permit. coverage under this permit at any time if the Department determines that the SWPPP does not meet the permit requirements. Upon a finding of 2. The owner or operator shall maintain a copy of the General Permit(GP-0- significant non-compliance with the practices described in the SWPPP or 15-002), NOI, NOI Acknowledgment Letter, SWPPP, MS4 SWPPP violation of this permit,the Department may order an immediate stop to all Acceptance form,inspection reports,and all documentation necessary to activity at the site until the non-compliance is remedied.The stop work order demonstrate eligibility with this permit at the construction site until all shall be in writing,describe the non-compliance in detail,and be sent to the disturbed areas have achieved final stabilization and the NOT has been owner or operator. submitted to the Department.The documents must be maintained in a secure location,such as a job trailer,on-site construction office,or mailbox 5. For construction activities that are subject to the requirements of a with lock.The secure location must be accessible during normal business regulated,traditional land use control MS4,the owner or operator shall hours to an individual performing a compliance inspection. notify the regulated, traditional land use control MS4 in writing of any planned amendments or modifications to the post-construction stormwater 3. The owner or operator of a construction activity shall not disturb greater management practice component of the SWPPP required by Part IIIA.4. than five(5)acres of soil at any one time without prior written authorization and 5.of this permit.Unless otherwise notified by the regulated,traditional from the Department or,in areas under the jurisdiction of a regulated, land use control MS4, the owner or operator shall have the SWPPP traditional land use control MS4,the regulated,traditional land use control amendments or modifications reviewed and accepted by the regulated, MS4(provided the regulated,traditional land use control MS4 is not the traditional land use control MS4 prior to commencing construction of the owner or operator of the construction activity).At a minimum,the owner or post-construction stormwater management practice operator must comply with the following requirements in order to be authorized to disturb greater than five(5)acres of soil at any one time: a.The owner or operator shall 16 15 (Part II.D) (Part III) D.Permit Coverage for Discharges Authorized Under GP-0-10-001 Part III.STORMWATER POLLUTION PREVENTION PLAN(SWPPP) 1. Upon renewal of SPDES General Permit for Stormwater Discharges from A.General SWPPP Requirements Construction Activity(Permit No.GP-0-10-001),an owner or operator of a construction activity with coverage under GP-0-10-001,as of the effective 1. A SWPPP shall be prepared and implemented by the owner or operator of date of GP-0-15-002,shall be authorized to discharge in accordance with each construction activity covered by this permit. The SWPPP must GP-0-15-002,unless otherwise notified by the Department. document the selection, design, installation, implementation and maintenance of the control measures and practices that will be used to meet An owner or operator may continue to implement the technical/design the effluent limitations in Part I.B.of this permit and where applicable,the components of the post-construction stormwater management controls post-construction stormwater management practice requirements in Part provided that such design was done in conformance with the technical I.C.of this permit.The SWPPP shall be prepared prior to the submittal of standards in place at the time of initial project authorization.However,they the NOI. The NOI shall be submitted to the Department prior to the must comply with the other,non-design provisions of GP-0-15-002. commencement of construction activity.A copy of the completed,final NOI shall be included in the SWPPP. E.Change of Owner or Operator 2. The SWPPP shall describe the erosion and sediment control practices and 2. When property ownership changes or when there is a change in operational where required,post-construction stormwater management practices that control over the construction plans and specifications,the original owner or will be used and/or constructed to reduce the pollutants in stormwater operator must notify the new owner or operator, in writing, of the discharges and to assure compliance with the terms and conditions of this requirement to obtain permit coverage by submitting a NOI with the permit.In addition,the SWPPP shall identify potential sources of pollution Department.Once the new owner or operator obtains permit coverage,the which may reasonably be expected to affect the quality of stormwater original owner oroperatorshall then submit a completed NOT with the name discharges. and permit identification number of the new owner or operator to the De partment at the address in Part II.A.1.of this permit.If the original owner 3. All SWPPPs that require the post-construction stormwater management or operator maintains ownership of a portion of the construction activity and practice component shall be prepared by a qualified professional that is will disturb soil,they must maintain their coverage under the permit. knowledgeable in the principles and practices of stormwater management and treatment. Permit coverage for the new owner or operator will be effective as of the date 4. The owner or operator must keep the SWPPP current so that it at all times the Department receives a complete NOI, provided the original owner or accurately documents the erosion and sediment controls practices that are operatorwas not subject to a sixty(60)business day authorization period that being used or will be used during construction,and all post-construction has not expired as of the date the Department receives the NOI from the new stormwater management practices that will be constructed on the site.At a owner or operator. minimum,the owner or operator shall amend the SWPPP: a.whenever the current provisions prove to be ineffective in minimizing pollutants in stormwater discharges from the site; b.whenever there is a change in design,construction,or operation at the construction site that has or could have an effect on the discharge of pollutants;and c.to address issues or deficiencies identified during an inspection by the qualified inspector,the Department or other regulatory authority. 5, The Department may notify the owner or operator at any time that the 17 18 (Part III.A.5) (Part III.A.6) SWPPP does not meet one or more of the minimum requirements of this trained contractor responsible for SWPPP implementation; the name, permit.The notification shall be in writing and identify the provisions of the address and telephone number of the contracting firm;the address(or other SWPPP that require modification.Within fourteen(14)calendar days of identifying description)of the site;and the date the certification statement such notification,or as otherwise indicated by the Department,the owner is signed.The owner or operator shall attach the certification statement(s) or operator shall make the required changes to the SWPPP and submit to the copy of the SWPPP that is maintained at the construction site.If new written notification to the Department that the changes have been made.If or additional contractors are hired to implement measures identified in the the owner or operator does not respond to the Departments comments in SWPPP after construction has commenced, they must also sign the the specified time frame,the Department may suspend the owner's or certification statement and provide the information listed above. operator's coverage under this permit or require the owner or operator to obtain coverage under an individual SPDES permit in accordance with Part 7, For projects where the Department requests a copy of the SWPPP or II.C.4.of this permit. inspection reports,the owner or operator shall submit the documents in both electronic(PDF only)and paper format within five(5)business days,unless 6. Prior to the commencement of construction activity,the owner or operator otherwise notified by the Department. must identify the contractor(s)and subcontractor(s)that will be responsible for installing,constructing,repairing,replacing,inspecting and maintaining B.Required SWPPP Contents the erosion and sediment control practices included in the SWPPP;and the contractor(s)and subcontractor(s)that will be responsible for constructing 1. Erosion and sediment control component-All SWPPPs prepared pursuant the post-construction stormwater management practices included in the to this permit shall include erosion and sediment control practices designed SWPPP.The owner or operator shall have each of the contractors and in conformance with the technical standard,New York State Standards and subcontractors identify at least one person from their company that will be Specifications for Erosion and Sediment Control, dated August 2005. responsible for implementation of the SWPPP.This person shall be known Where erosion and sediment control practices are not designed in as the trained contractor.The owner or operator shall ensure that at least conformance with the design criteria included in the technical standard,the one trained contractor is on site on a daily basis when soil disturbance owner or operator must demonstrate equivalence to the technical standard. activities are being performed. At a minimum,the erosion and sediment control component of the SWPPP The owner or operator shall have each of the contractors and shall include the following: subcontractors identified above sign a copy of the following certification a.Background information about the scope of the project, including the statement below before they commence any construction activity: location,type and size of project; "I hereby certify under penalty of law that I understand and agree to comply with the terms and conditions of the SWPPP and agree to b.A site map/construction drawing(s)for the project,including a general implement any corrective actions identified by the qualified inspector location map.At a minimum,the site map shall show the total site area; during a site inspection. I also understand that the owner or operator all improvements;areas of disturbance;areas that will not be disturbed; must comply with the terms and conditions of the most current version existing vegetation; on-site and adjacent off-site surface water(s); of the New York State Pollutant Discharge Elimination System floodplain/floodway boundaries; wetlands and drainage patterns that ("SPDES")general permit for stormwater discharges from construction could be affected by the construction activity;existing and final contours; activities and that it is unlawful for any person to cause or contribute locations of different soil types with boundaries;material,waste,borrow to a violation of water quality standards.Furthermore,I am aware that or equipment storage areas located on adjacent properties; and there are significant penalties for submitting false information,that I do location(s)of the stormwater discharge(s); not believe to be true,including the possibility of fine and imprisonment for knowing violations" c.A description of the soil(s)present at the site,including an identification of the Hydrologic Soil Group(HSG); In addition to providing the certification statement above,the certification page must also identify the specific elements of the SWPPP that each d.A construction phasing plan and sequence of operations describing the contractor and subcontractor will be responsible for and include the name intended order of construction activities,including clearing and grubbing, and title of the person providing the signature;the name and title of the excavation and grading,utility and infrastructure installation and any other 19 20 (Part III.B.1.d) (Part III.B.1.1) activity at the site that results in soil disturbance; and provide information which demonstrates that the deviation or alternative design is equivalent to the technical standard. e.A description of the minimum erosion and sediment control practices to be installed or implemented for each construction activity that will result in 2. Post-construction stormwater management practice component — The soil disturbance. Include a schedule that identifies the timing of initial owner or operator of any construction project identified in Table 2 of placement or implementation of each erosion and sediment control Appendix B as needing post-construction stormwater management practice and the minimum time frames that each practice should remain practices shall prepare a SWPPP that includes practices designed in in place or be implemented; conformance with the applicable sizing criteria in Part I.C.2.a.,c.or d.of this permit and the performance criteria in the technical standard,New York f. A temporary and permanent soil stabilization plan that meets the State Stormwater Management Design Manual dated January 2015 requirements of this general permit and the technical standard,New York State Standards and Specifications for Erosion and Sediment Control, Where post-construction stormwater management practices are not dated August 2005,for each stage of the project,including initial land designed in conformance with the performance criteria in the technical clearing and grubbing to project completion and achievement of final standard,the owner or operator must include in the SWPPP the reason(s) stabilization; for the deviation or alternative design and provide information which demonstrates that the deviation or alternative design is equivalent to the g.A site map/construction drawing(s) showing the specific location(s), technical standard. size(s),and length(s)of each erosion and sediment control practice; The post-construction stormwater management practice component of the h.The dimensions,material specifications,installation details,and operation SWPPP shall include the following: and maintenance requirements for all erosion and sediment control a.Identification of all post-construction stormwater management practices to practices. Include the location and sizing of any temporary sediment be constructed as part of the project.Include the dimensions,material basins and structural practices that will be used to divert flows from specifications and installation details for each post-construction exposed soils; stormwater management practice; i. A maintenance inspection schedule for the contractor(s)identified in Part b.A site map/construction drawing(s)showing the specific location and size III.A.6.of this permit,to ensure continuous and effective operation of the of each post-construction stormwater management practice; erosion and sediment control practices. The maintenance inspection schedule shall be in accordance with the requirements in the technical c.A Stormwater Modeling and Analysis Report that includes: standard,New York State Standards and Specifications for Erosion and Sediment Control,dated August 2005; (i) Map(s) showing pre-development conditions, including watershed/subcatchments boundaries, flow paths/routing, and j. A description of the pollution prevention measures that will be used to design points; control litter, construction chemicals and construction debris from becoming a pollutant source in the stormwater discharges; (ii)Map(s) showing post-development conditions, including watershed/subcatchments boundaries,flow paths/routing,design k.A description and location of any stormwater discharges associated with points and post-construction stormwater management practices; industrial activity other than construction at the site,including, but not limited to,stormwater discharges from asphalt plants and concrete plants (iii) Results of stormwater modeling (i.e. hydrology and hydraulic located on the construction site;and analysis) for the required storm events. Include supporting calculations(model runs),methodology,and a summary table that I. Identification of any elements of the design that are not in conformance compares pre and post-development runoff rates and volumes for with the design criteria in the technical standard, New York State the different storm events; Standards and Specifications for Erosion and Sediment Control,dated August 2005.Include the reason for the deviation or alternative design (iv) Summary table,with supporting calculations,which demonstrates 21 22 (Part III.B.2.c.iv) (Part IV) that each post-construction stormwater management practice has Part IV.INSPECTION AND MAINTENANCE REQUIREMENTS been designed in conformance with the sizing criteria included in the Design Manual; A.General Construction Site Inspection and Maintenance Requirements 1, The owner or operator must ensure that all erosion and sediment control (v) Identification of any sizing criteria that is not required based on the practices (including pollution prevention measures) and all post- requirements included in Part I.C.of this permit;and construction stormwater management practices identified in the SWPPP are inspected and maintained in accordance with Part IV.B.and C.of this (vi) Identification of any elements of the design that are not in permit conformance with the performance criteria in the Design Manual. Include the reason(s)for the deviation or alternative design and 2. The terms of this permit shall not be construed to prohibit the State of New provide information which demonstrates that the deviation or York from exercising any authority pursuant to the ECL,common law or alternative design is equivalentto the Design Manual; federal law,or prohibit New York State from taking any measures,whether d.Soil testing results and locations(test pits,borings); civil or criminal,to prevent violations of the laws of the State of New York, or protect the public health and safety and/or the environment. e.Infiltration test results,when required;and f. An operations and maintenance plan that includes inspection and B.Contractor Maintenance Inspection Requirements maintenance schedules and actions to ensure continuous and effective operation of each post-construction stormwater management practice. 1. The owner or operator of each construction activity identified in Tables 1 The plan shall identify the entity that will be responsible for the long term and 2 of Appendix B shall have a trained contractor inspect the erosion and operation and maintenance of each practice. sediment control practices and pollution prevention measures being implemented within the active work area daily to ensure that they are being 3. Enhanced Phosphorus Removal Standards -All construction projects maintained in effective operating condition at all times.If deficiencies are identified in Table 2 of Appendix B that are located in the watersheds identified,the contractor shall begin implementing corrective actions within identified in Appendix C shall prepare a SWPPP that includes post- one business day and shall complete the corrective actions in a reasonable construction stormwater management practices designed in conformance time frame. with the applicable sizing criteria in Part I.C.2.b.,c.or d.of this permit and the performance criteria, Enhanced Phosphorus Removal Standards included in the Design Manual. At a minimum, the post-construction 2. For construction sites where soil disturbance activities have been stormwater management practice component of the SWPPP shall include temporarily suspended(e.g.winter shutdown)and temporary stabilization items 2.a-2.f.above. measures have been applied to all disturbed areas,the trained contractor can stop conducting the maintenance inspections.The trained contractor C.Required SWPPP Components by Project Type shall begin conducting the maintenance inspections in accordance with Part IV.B.1.of this permit as soon as soil disturbance activities resume. Unless otherwise notified by the Department,owners or operators of construction activities identified in Table 1 of Appendix B are required to prepare a SWPPP that only includes erosion and sediment control practices designed in conformance with 3. For construction sites where soil disturbance activities have been shut down Part III.B.1 of this permit.Owners or operators of the construction activities identified with partial project completion,the trained contractor can stop conducting in Table 2 of Appendix B shall prepare a SWPPP that also includes post-construction the maintenance inspections if all areas disturbed as of the project stormwater management practices designed in conformance with Part III.B.2 or 3 of shutdown date have achieved final stabilization and all post-construction this permit. stormwater management practices required for the completed portion of the project have been constructed in conformance with the SWPPP and are operational. C.Qualified Inspector Inspection Requirements 23 24 (Part IV.C) (Part IV.C.2.b) The owner or operator shall have a qualified inspector conduct site inspections in the owner or operator has received authorization in accordance with Part conformance with the following requirements: II.C.3 to disturb greater than five(5)acres of soil at any one time,the qualified inspector shall conduct at least two(2)site inspections every [Note:The trained contractor identified in Part III.A.6.and IV.B.of this permit seven(7)calendar days.The two(2)inspections shall be separated by a cannot conduct the qualified inspector site inspections unless they meet the minimum of two(2)full calendar days. qualified inspector qualifications included in Appendix A.In order to perform these inspections,the trained contractor would have to be a: c.For construction sites where soil disturbance activities have been -licensed Professional Engineer, temporarily suspended(e.g.winter shutdown)and temporary stabilization -Certified Professional in Erosion and Sediment Control(CPESC), measures have been applied to all disturbed areas,the qualified inspector -Registered Landscape Architect,or shall conduct a site inspection at least once every thirty(30)calendar -someone working under the direct supervision of,and at the same company days. The owner or operator shall notify the DOW Water (SPDES) as,the licensed Professional Engineer or Registered Landscape Architect, Program contact at the Regional Office (see contact information in provided they have received four(4)hours of Department endorsed training Appendix F)or,in areas under the jurisdiction of a regulated,traditional in proper erosion and sediment control principles from a Soil and Water land use control MS4,the regulated,traditional land use control MS4 Conservation District,or other Department endorsed entity]. (provided the regulated,traditional land use control MS4 is not the owner or operator of the construction activity)in writing prior to reducing the 1, A qualified inspector shall conduct site inspections for all construction frequency of inspections. activities identified in Tables 1 and 2 of Appendix B,with the exception of: d.For construction sites where soil disturbance activities have been shut a.the construction of a single family residential subdivision with 25%or less down with partial project completion,the qualified inspector can stop impervious cover at total site build-out that involves a soil disturbance of conducting inspections if all areas disturbed as of the project shutdown one(1)or more acres of land but less than five(5)acres and is not located date have achieved final stabilization and all post-construction stormwater in one of the watersheds listed in Appendix C and not directly discharging management practices required for the completed portion of the project to one of the 303(d)segments listed in Appendix E; have been constructed in conformance with the SWPPP and are operational.The owner or operator shall notify the DOW Water(SPDES) b.the construction of a single family home that involves a soil disturbance of Program contact at the Regional Office (see contact information in one(1)or more acres of land but less than five(5)acres and is not located Appendix F)or,in areas under the jurisdiction of a regulated,traditional in one of the watersheds listed in Appendix C and not directly discharging land use control MS4,the regulated, traditional land use control MS4 to one of the 303(d)segments listed in Appendix E; (provided the regulated,traditional land use control MS4 is not the owner or operator of the construction activity)in writing prior to the shutdown.If c.construction on agricultural property that involves a soil disturbance of one soil disturbance activities are not resumed within 2 years from the date of (1)or more acres of land but less than five(5)acres;and shutdown,the owner or operator shall have the qualified inspector perform a final inspection and certify that all disturbed areas have achieved final d.construction activities located in the watersheds identified in Appendix D stabilization,and all temporary,structural erosion and sediment control that involve soil disturbances between five thousand(5,000)square feet measures have been removed,-and that all post-construction stormwater and one(1)acre of land. management practices have been constructed in conformance with the SWPPP by signing the "Final Stabilization" and "Post-Construction 2. Unless otherwise notified by the Department,the qualified inspector shall Stormwater Management Practice"certification statements on the NOT. conduct site inspections in accordance with the following timetable: The owner or operator shall then submit the completed NOT form to the address in Part II.A.1 of this permit. a.For construction sites where soil disturbance activities are on-going,the qualified inspector shall conduct a site inspection at least once every e.For construction sites that directly discharge to one of the 303(d) seven(7)calendar days. segments listed in Appendix E or is located in one of the watersheds listed in Appendix C,the qualified inspector shall conduct at least two(2)site b.For construction sites where soil disturbance activities are on-going and inspections every seven(7)calendar days.The two(2)inspections shall 25 26 (Part IV.C.2.e) (Part IV.C.4.i) be separated by a minimum of two(2)full calendar days. i. Current phase of construction of all post-construction stormwater management practices and identification of all construction that is not in 3. At a minimum,the qualified inspector shall inspect all erosion and sediment conformance with the SWPPP and technical standards; control practices and pollution prevention measures to ensure integrity and effectiveness, all post-construction stormwater management practices j. Corrective action(s) that must be taken to install, repair, replace or under construction to ensure that they are constructed in conformance with maintain erosion and sediment control practices and pollution prevention the SWPPP, all areas of disturbance that have not achieved final measures;and to correct deficiencies identified with the construction of stabilization,all points of discharge to natural surface waterbodies located the post-construction stormwater management practice(s); within, or immediately adjacent to, the property boundaries of the construction site,and all points of discharge from the construction site. k.Identification and status of all corrective actions that were required by previous inspection;and 4, The qualified inspector shall prepare an inspection report subsequent to each and every inspection.At a minimum,the inspection report shall include I. Digital photographs,with date stamp,that clearly show the condition of all and/or address the following: practices that have been identified as needing corrective actions.The qualified inspector shall attach paper color copies of the digital photographs to the inspection report being maintained onsite within seven a.Date and time of inspection; (7)calendar days of the date of the inspection.The qualified inspector shall also take digital photographs,with date stamp,that clearly show the b.Name and title of person(s)performing inspection; condition of the practice(s)after the corrective action has been completed. The qualified inspector shall attach paper color copies of the digital c.A description of the weather and soil conditions(e.g.dry,wet,saturated) photographs to the inspection report that documents the completion of the at the time of the inspection; corrective action work within seven(7)calendar days of that inspection. d.A description of the condition of the runoff at all points of discharge from 5, Within one business day of the completion of an inspection,the qualified the construction site.This shall include identification of any discharges of inspector shall notify the owner or operator and appropriate contractor or sediment from the construction site.Include discharges from conveyance subcontractor identified in Part III.A.6. of this permit of any corrective systems(i.e.pipes,culverts,ditches,etc.)and overland flow; actions that need to be taken.The contractor or subcontractor shall begin implementing the corrective actions within one business day of this e.A description of the condition of all natural surface waterbodies located notification and shall complete the corrective actions in a reasonable time within, or immediately adjacent to, the property boundaries of the frame. construction site which receive runoff from disturbed areas.This shall include identification of any discharges of sediment to the surface waterbody; 6. All inspection reports shall be signed by the qualified inspector.Pursuant to Part II.C.2.of this permit,the inspection reports shall be maintained on site f. Identification of all erosion and sediment control practices and pollution with the SWPPP. prevention measures that need repair or maintenance; Part V.TERMINATION OF PERMIT COVERAGE g.Identification of all erosion and sediment control practices and pollution prevention measures that were not installed properly or are not functioning A. Termination of Permit Coverage as designed and need to be reinstalled or replaced; 1, An owner or operator that is eligible to terminate coverage under this permit h.Description and sketch of areas with active soil disturbance activity,areas must submit a completed NOT form to the address in Part II.A.1 of this that have been disturbed but are inactive at the time of the inspection,and permit.The NOT form shall be one which is associated with this permit, areas that have been stabilized(temporary and/or final)since the last signed in accordance with Part VII.H of this permit. inspection; 27 28 (Part V.A.2) (Part V.A.5) 2. An owner or operator may terminate coverage when one or more the 5. For construction activities that require post-construction stormwater following conditions have been met: management practices and meet subdivision 2a.of this Part,the owner or operator must,prior to submitting the NOT,ensure one of the following: a.Total project completion-All construction activity identified in the SWPPP has been completed;and all areas of disturbance have achieved final a.the post-construction stormwater management practice(s)and any right- stabilization;and all temporary,structural erosion and sediment control of-way(s)needed to maintain such practice(s)have been deeded to the measures have been removed; and all post-construction stormwater municipality in which the practice(s)is located, management practices have been constructed in conformance with the SWPPP and are operational; b.an executed maintenance agreement is in place with the municipality that will maintain the post-construction stormwater management practice(s), b.Planned shutdown with partial project completion-All soil disturbance activities have ceased;and all areas disturbed as of the project shutdown c.for post-construction stormwater management practices that are privately date have achieved final stabilization;and all temporary,structural erosion owned,the owner or operator has a mechanism in place that requires and sediment control measures have been removed; and all post- operation and maintenance of the practice(s) in accordance with the construction stormwater management practices required for the operation and maintenance plan,such as a deed covenant in the owner completed portion of the project have been constructed in conformance or operator's deed of record, with the SWPPP and are operational; d.for post-construction stormwater management practices that are owned c.A new owner or operator has obtained coverage under this permit in by a public or private institution (e.g. school, university, hospital), accordance with Part II.E.of this permit government agency or authority,or public utility;the owner or operator has policy and procedures in place that ensures operation and d.The owner or operator obtains coverage under an alternative SPDES maintenance of the practices in accordance with the operation and general permit or an individual SPDES permit. maintenance plan. 3. For construction activities meeting subdivision 2a.or 2b.of this Part,the Part VI.REPORTING AND RETENTION OF RECORDS owner or operator shall have the qualified inspector perform a final site inspection prior to submitting the NOT.The qualified inspector shall, by A.Record Retention signing the "Final Stabilization" and "Post-Construction Stormwater Management Practice certification statements on the NOT,certify that all The owner or operator shall retain a copy of the NOI,NOI the requirements in Part V.A.2.a.orb.of this permit have been achieved. Acknowledgment Letter, SWPPP, MS4 SWPPP Acceptance form and any inspection reports that were prepared in conjunction with this permit for a period of 4. For construction activities that are subject to the requirements of a at least five(5)years from the date that the Department receives a complete NOT regulated,traditional land use control MS4 and meet subdivision 2a.or 2b. submitted in accordance with Part V.of this general permit of this Part,the owner or operator shall have the regulated,traditional land use control MS4 sign the"MS4 Acceptance"statement on the NOT in B.Addresses accordance with the requirements in Part VII.H. of this permit. The regulated, traditional land use control MS4 official, by signing this With the exception of the NOI,NOT,and MS4 SWPPP Acceptance form(which statement,has determined that it is acceptable for the owner or operator to must be submitted to the address referenced in Part II.A.1 of this permit),all written submit the NOT in accordance with the requirements of this Part.The correspondence requested by the Department, including individual permit regulated,traditional land use control MS4 can make this determination by applications,shall be sent to the address of the appropriate DOW Water(SPDES) performing a final site inspection themselves or by accepting the qualified Program contact at the Regional Office listed in Appendix F. inspector's final site inspection certification(s)required in Part V.A.3.of this permit. 29 30 (Part VII) (Part VILE) Part VII. STANDARD PERMIT CONDITIONS E.Duty to Mitigate A.Duty to Comply The owner or operator and its contractors and subcontractors shall take all reasonable steps to minimize or prevent any discharge in violation of this permit The owner or operatormust comply with all conditions of this permit.All contractors which has a reasonable likelihood of adversely affecting human health or the and subcontractors associated with the project must comply with the terms of the environment. SWPPP.Any non-compliance with this permit constitutes a violation of the Clean Water Act(CWA)and the ECL and is grounds for an enforcement action against the F.Duty to Provide Information owner or operator and/or the contractor/subcontractor; permit revocation, suspension or modification;or denial ofa permit renewal application.Upon a finding The owner or operator shall furnish to the Department,within a reasonable specified of significant non-compliance with this permit or the applicable SWPPP, the time period of a written request, all documentation necessary to demonstrate Department may order an immediate stop to all construction activity at the site until eligibility and any information to determine compliance with this permit or to the non-compliance is remedied.The stop work order shall be in writing, shall determine whether cause exists for modifying or revoking this permit,or suspending describe the non-compliance in detail,and shall be sent to the owner or operator. or denying coverage under this permit,in accordance with the terms and conditions of this permit.The NOI,SWPPP and inspection reports required by this permit are If any human remains or archaeological remains are encountered during excavation, public documents that the owner or operator must make available for review and the owner or operator must immediately cease,or cause to cease,all construction copying by any person within five (5) business days of the owner or operator activity in the area of the remains and notify the appropriate Regional Water receiving a written request by any such person to review these documents.Copying Engineer(RWE). Construction activity shall not resume until written permission to of documents will be done at the requester's expense. do so has been received from the RWE. G.Other Information B.Continuation of the Expired General Permit When the owner or operator becomes aware that they failed to submit any relevant This permit expires five(5)years from the effective date.If a new general permit is facts,or submitted incorrect information in the NOI or in any of the documents not issued prior to the expiration of this general permit,an owner or operator with required by this permit,or have made substantive revisions to the SWPPP(e.g.the coverage under this permit may continue to operate and discharge in accordance scope of the project changes significantly,the type of post-construction stormwater with the terms and conditions of this general permit,if it is extended pursuant to the management practice(s)changes,there is a reduction in the sizing of the post- State Administrative Procedure Act and 6 NYCRR Part 621,until a new general construction stormwater management practice, or there is an increase in the permit is issued. disturbance area or impervious area),which were not reflected in the original NOI submitted to the Department,they shall promptly submit such facts or information to C.Enforcement the Department using the contact information in Part II.A.of this permit.Failure of the owner or operator to correct or supplement any relevant facts within five(5) Failure of the owner or operator, its contractors,subcontractors,agents and/or business days of becoming aware of the deficiency shall constitute a violation of this assigns to strictly adhere to any of the permit requirements contained herein shall permit constitute a violation of this permit. There are substantial criminal, civil, and administrative penalties associated with violating the provisions of this permit. Fines H.Signatory Requirements of up to$37,500 per day for each violation and imprisonment for up to fifteen(15) years may be assessed depending upon the nature and degree of the offense. 1. All NOls and NOTs shall be signed as follows: D.Need to Halt or Reduce Activity Not a Defense a.For a corporation these forms shall be signed by a responsible corporate It shall not be a defense for an owner or operator in an enforcement action that it officer.For the purpose of this section,a responsible corporate officer would have been necessary to halt or reduce the construction activity in order to means: maintain compliance with the conditions of this permit. (i) a president,secretary,treasurer,or vice-president of the 31 32 (Part VII.H.1.a.i) (Part VII.H.2.b) corporation in charge of a principal business function,or any other individual or any individual occupying a named position)and, person who performs similar policy or decision-making functions for the corporation;or c.The written authorization shall include the name,title and signature of the authorized representative and be attached to the SWPPP. (ii) the manager of one or more manufacturing, production or operating facilities,provided the manager is authorized to make 3. All inspection reports shall be signed by the qualified inspector that management decisions which govern the operation of the performs the inspection. regulated facility including having the explicit or implicit duty of making major capital investment recommendations,and initiating 4. The MS4 SWPPP Acceptance form shall be signed by the principal and directing other comprehensive measures to assure long term executive officer or ranking elected official from the regulated,traditional environmental compliance with environmental laws and land use control MS4,or by a duly authorized representative of that person. regulations;the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate It shall constitute a permit violation if an incorrect and/or improper information for permit application requirements; and where signatory authorizes any required forms,SWPPP and/or inspection authority to sign documents has been assigned or delegated to reports. the manager in accordance with corporate procedures; I.Property Rights b.For a partnership or sole proprietorship these forms shall be signed by a general partner or the proprietor,respectively;or The issuance of this permit does not convey any property rights of any sort,nor any exclusive privileges,nor does it authorize any injury to private property nor c.For a municipality,State,Federal,or other public agency these forms shall any invasion of personal rights,nor any infringement of Federal,State or local be signed by either a principal executive officer or ranking elected official. laws or regulations. Owners or operators must obtain any applicable For purposes of this section,a principal executive officer of a Federal conveyances, easements, licenses and/or access to real property prior to agency includes: commencing construction activity. (i) the chief executive officer of the agency,or J.Severability (ii) a senior executive officer having responsibility for the overall The provisions of this permit are severable,and if any provision of this permit,or operations of a principal geographic unit of the agency(e.g., the application of any provision of this permit to any circumstance,is held invalid, Regional Administrators of EPA). the application of such provision to other circumstances,and the remainder of this permit shall not be affected thereby. 2. The SWPPP and other information requested by the Department shall be signed by a person described in Part VII.H.1.of this permit or by a duly K.Requirement to Obtain Coverage Under an Alternative Permit authorized representative of that person.A person is a duly authorized representative only if: 1. The Department may require any owner or operator authorized by this permit to apply for and/or obtain either an individual SPDES permit or a.The authorization is made in writing by a person described in Part VII.H.1. another SPDES general permit. When the Department requires any of this permit; discharger authorized by a general permit to apply for an individual SPDES permit,it shall notify the discharger in writing that a permit application is b.The authorization specifies either an individual or a position having required.This notice shall include a brief statement of the reasons for this responsibility for the overall operation of the regulated facility or activity, decision,an application form,a statement setting a time frame for the owner such as the position of plant manager,operator of a well or a well field, or operator to file the application for an individual SPDES permit,and a superintendent,position of equivalent responsibility,or an individual or deadline,not sooner than 180 days from owner or operator receipt of the position having overall responsibility for environmental matters for the notification letter,whereby the authorization to company.(A duly authorized representative may thus be either a named 33 34 (Part VII.K.1) (Part VII.N) discharge under this general permit shall be terminated.Applications must N.Permit Actions be submitted to the appropriate Permit Administrator at the Regional Office. This permit may,at any time,be modified,suspended,revoked,or renewed by the The Department may grant additional time upon demonstration,to the Department in accordance with 6 NYCRR Part 621.The filing of a request by the satisfaction of the Department, that additional time to apply for an owner or operator for a permit modification,revocation and reissuance,termination, alternative authorization is necessary or where the Department has not a notification of planned changes or anticipated noncompliance does not limit, provided a permit determination in accordance with Part 621 of this Title. diminish and/or stay compliance with any terms of this permit. 2. When an individual SPDES permit is issued to a discharger authorized to O.Definitions discharge under a general SPDES permit for the same discharge(s),the general permit authorization for outfalls authorized under the individual Definitions of key terms are included in Appendix A of this permit. SPDES permit is automatically terminated on the effective date of the individual permit unless termination is earlier in accordance with 6 NYCRR P.Re-Opener Clause Part 750. 1. If there is evidence indicating potential or realized impacts on water quality L.Proper Operation and Maintenance due to any stormwater discharge associated with construction activity covered by this permit,the owner or operator of such discharge may be The owner or operator shall at all times properly operate and maintain all facilities required to obtain an individual permit or alternative general permit in and systems of treatment and control (and related appurtenances)which are accordance with Part VII.K.of this permit or the permit may be modified to installed or used by the owner or operator to achieve compliance with the conditions include different limitations and/or requirements. of this permit and with the requirements of the SWPPP. M.Inspection and Entry 2, Any Department initiated permit modification,suspension or revocation will be conducted in accordance with 6 NYCRR Part 621,6 NYCRR 750-1.18, The owner or operator shall allow an authorized representative of the Department, and 6 NYCRR 750-1.20. EPA, applicable county health department,or,in the case of a construction site which discharges through an MS4, an authorized representative of the MS4 receiving the discharge,upon the presentation of credentials and other documents Q.Penalties for Falsification of Forms and Reports as may be required by law,to: In accordance with 6NYCRR Part 750-2.4 and 750-2.5,any person who knowingly 1. Enter upon the owner's or operator's premises where a regulated facility or makes any false material statement, representation, or certification in any activity is located or conducted or where records must be kept under the application,record,report or other document filed or required to be maintained under conditions of this permit; this permit,including reports of compliance or noncompliance shall,upon conviction, be punished in accordance with ECL§71-1933 and or Articles 175 and 210 of the 2. Have access to and copy at reasonable times,any records that must be New York State Penal Law. kept under the conditions of this permit;and R.Other Permits 3. Inspect at reasonable times any facilities or equipment(including monitoring and control equipment),practices or operations regulated or required by Nothing in this permit relieves the owner or operator from a requirement to obtain this permit. any other permits required by law. 4. Sample or monitor at reasonable times,for purposes of assuring permit compliance or as otherwise authorized by the Act or ECL,any substances or parameters at any location. 35 36 APPENDIX A on all disturbed areas that are not covered by permanent structures,concrete or pavement. Definitions General SPDES permit-means a SPDES permit issued pursuant to 6 NYCRR Part 750- Alter Hydrology from Pre to Post-Development Conditions-means the post- 1.21 and Section 70-0117 of the ECL authorizing a category of discharges. development peak flow rate(s)has increased by more than 5%of the pre-developed Groundwater(s)-means waters in the saturated zone.The saturated zone is a condition for the design storm of interest(e.g.10 yr and 100 yr). subsurface zone in which all the interstices are filled with water under pressure greater Combined Sewer-means a sewer that is designed to collect and convey both"sewage" than that of the atmosphere.Although the zone may contain gas-filled interstices or and"stormwater". interstices filled with fluids other than water,it is still considered saturated. Commence(Commencement of)Construction Activities-means the initial Historic Property—means any building,structure,site,object or district that is listed on disturbance of soils associated with clearing,grading or excavation activities;or other the State or National Registers of Historic Places or is determined to be eligible for listing construction related activities that disturb or expose soils such as demolition,stockpiling on the State of fill material,and the initial installation of erosion and sediment control practices or National Registers of Historic Places. required in the SWPPP.See definition for"Construction Activity(ies)"also. Impervious Area(Cover)-means all impermeable surfaces that cannot effectively Construction Activity(ies)-means any clearing,grading,excavation,filling,demolition infiltrate rainfall.This includes paved,concrete and gravel surfaces(i.e.parking lots, or stockpiling activities that result in soil disturbance.Clearing activities can include,but driveways,roads,runways and sidewalks);building rooftops and miscellaneous are not limited to,logging equipment operation,the cuffing and skidding of trees,stump impermeable structures such as patios,pools,and sheds. removal and/or brush root removal.Construction activity does not include routine Infeasible—means not technologically possible,or not economically practicable and maintenance that is performed to maintain the original line and grade,hydraulic capacity, achievable in light of best industry practices. or original purpose of a facility. Direct Discharge(to a specific surface waterbody)-means that runoff flows from a Larger Common Plan of Development or Sale-means a contiguous area where construction site by overland flow and the first point of discharge is the specific surface multiple separate and distinct construction activities are occurring,or will occur,under waterbody,or runoff flows from a construction site to a separate storm sewer system and one plan.The term"plan"in"larger common plan of development or sale"is broadly the first point of discharge from the separate storm sewer system is the specific surface defined as any announcement or piece of documentation(including a sign,public notice waterbody. or hearing,marketing plan,advertisement,drawing,permit application,State Environmental Quality Review Act(SEQRA)environmental assessment form or other Discharge(s)-means any addition of any pollutant to waters of the State through an documents,zoning request,computer design,etc.)or physical demarcation(including outlet or point source. boundary signs,lot stakes,surveyor markings,etc.)indicating that construction activities may occur on a specific plot. Environmental Conservation Law(ECL)-means chapter 43-B of the Consolidated For discrete construction projects that are located within a larger common plan of Laws of the State of New York,entitled the Environmental Conservation Law. development or sale that are at least 1/4 mile apart,each project can be treated as a Equivalent(Equivalence)—means that the practice or measure meets all the separate plan of development or sale provided any interconnecting road,pipeline or utility performance,longevity,maintenance,and safety objectives of the technical standard and project that is part of the same"common plan"is not concurrently being disturbed. will provide an equal or greater degree of water quality protection. Minimize—means reduce and/or eliminate to the extent achievable using control Final Stabilization-means that all soil disturbance activities have ceased and a uniform, measures(including best management practices)that are technologically available and perennial vegetative cover with a density of eighty(80)percent over the entire pervious economically practicable and achievable in light of best industry practices. surface has been established;or other equivalent stabilization measures,such as Municipal Separate Storm Sewer(MS4)-a conveyance or system of conveyances permanent landscape mulches,rock rip-rap orwashed/crushed stone have been applied (including roads with drainage systems,municipal streets,catch basins,curbs,gutters, 37 38 ditches,man-made Qualified Inspector-means a person that is knowledgeable in the principles and channels,or storm drains): practices of erosion and sediment control,such as a licensed Professional Engineer, (i) Owned or operated by a State,city,town,borough,county,parish,district, Certified Professional in Erosion and Sediment Control(CPESC),Registered Landscape association,or other public body(created by or pursuant to State law)having Architect,or other Department endorsed individual(s). jurisdiction over disposal of sewage,industrial wastes,stormwater,or other wastes,including special districts under State law such as a sewer district,flood It can also mean someone working under the direct supervision of,and at the same control district or drainage district,or similar entity,or an Indian tribe or an company as,the licensed Professional Engineer or Registered Landscape Architect, authorized Indian tribal organization,or a designated and approved management provided that person has training in the principles and practices of erosion and sediment agency under section 208 of the CWA that discharges to surface waters of the control.Training in the principles and practices of erosion and sediment control means State; that the individual working under the direct supervision of the licensed Professional (ii) Designed or used for collecting or conveying stormwater; Engineer or Registered Landscape Architect has received four(4)hours of Department (iii) Which is not a combined sewer,and endorsed training in proper erosion and sediment control principles from a Soil and Water (iv) Which is not part of a Publicly Owned Treatment Works(POTW)as defined at 40 Conservation District,or other Department endorsed entity.After receiving the initial CFR 122.2. training,the individual working under the direct supervision of the licensed Professional Engineer or Registered Landscape Architect shall receive four(4)hours of training every National Pollutant Discharge Elimination System(NPDES)-means the national three(3)years. system for the issuance of wastewater and stormwater permits under the Federal Water Pollution Control Act(Clean Water Act). It can also mean a person that meets the Qualified Professional qualifications in addition to the Qualified Inspector qualifications. New Development—means any land disturbance that does not meet the definition of Redevelopment Activity included in this appendix. Note:Inspections of any post-construction stormwater management practices that include structural components,such as a dam for an impoundment,shall be performed by a NOI Acknowledgment Letter-means the letter that the Department sends to an owner licensed Professional Engineer. or operator to acknowledge the Department's receipt and acceptance of a complete Notice of Intent.This letter documents the owner's or operator's authorization to Qualified Professional-means a person that is knowledgeable in the principles and discharge in accordance with the general permit for stormwater discharges from practices of stormwater management and treatment,such as a licensed Professional construction activity. Engineer,Registered Landscape Architect or other Department endorsed individual(s). Individuals preparing SWPPPs that require the post-construction stormwater Owner or Operator-means the person,persons or legal entity which owns or leases the management practice component must have an understanding of the principles of property on which the construction activity is occurring;and/or an entity that has hydrology,water quality management practice design,water quantity control design,and, operational control over the construction plans and specifications,including the ability to in many cases,the principles of hydraulics.All components of the SWPPP that involve make modifications to the plans and specifications. the practice of engineering,as defined by the NYS Education Law(see Article 145),shall be prepared by,or under the direct supervision of,a professional engineer licensed to Performance Criteria—means the design criteria listed under the"Required Elements" practice in the State of New York.. sections in Chapters 5,6 and 10 of the technical standard,New York State Stormwater Management Design Manual,dated January 2015.It does not include the Sizing Criteria Redevelopment Activity(ies)—means the disturbance and reconstruction of existing (i.e.WQv,RRv,Cpv,Qp and Qf)in Part I.C.2.of the permit. impervious area,including impervious areas that were removed from a project site within five(5)years of preliminary project plan submission to the local government(i.e.site plan, Pollutant-means dredged spoil,filter backwash,solid waste,incinerator residue, subdivision,etc.). sewage,garbage,sewage sludge,munitions,chemical wastes,biological materials, radioactive materials,heat,wrecked or discarded equipment,rock,sand and industrial, municipal,agricultural waste and ballast discharged into water;which may cause or might Regulated,Traditional Land Use Control MS4-means a city,town or village with land reasonably be expected to cause pollution of the waters of the state in contravention of use control authority that is required to gain coverage under New York State DEC's the standards or guidance values adopted as provided in 6 NYCRR Parts 700 et seq. SPDES General Permit For Stormwater Discharges from Municipal Separate Stormwater Sewer Systems(MS4s). 39 40 the map unit name is inclusive of 25%or greater slope,on the United States Department Routine Maintenance Activity-means construction activity that is performed to of Agriculture("USDA")Soil Survey for the County where the disturbance will occur. maintain the original line and grade,hydraulic capacity,or original purpose of a facility, including,but not limited to: Surface Waters of the State-shall be construed to include lakes,bays,sounds,ponds, -Re-grading of gravel roads or parking lots, impounding reservoirs,springs,rivers,streams,creeks,estuaries,marshes,inlets, -Stream bank restoration projects(does not include the placement of spoil canals,the Atlantic ocean within the territorial seas of the state of New York and all other material), bodies of surface water,natural or artificial,inland or coastal,fresh or salt,public or -Cleaning and shaping of existing roadside ditches and culverts that maintains the private(except those private waters that do not combine or effect a junction with natural approximate original line and grade,and hydraulic capacity of the ditch, surface waters),which are wholly or partially within or bordering the state or within its -Cleaning and shaping of existing roadside ditches that does not maintain the jurisdiction.Waters of the state are further defined in 6 NYCRR Parts 800 to 941. approximate original grade,hydraulic capacity and purpose of the ditch if the changes to the line and grade,hydraulic capacity or purpose of the ditch are Temporarily Ceased—means that an existing disturbed area will not be disturbed again installed to improve water quality and quantity controls(e.g.installing grass lined within 14 calendar days of the previous soil disturbance. ditch), -Placement of aggregate shoulder backing that makes the transition between the Temporary Stabilization-means that exposed soil has been covered with material(s)as road shoulder and the ditch or embankment, set forth in the technical standard,New York Standards and Specifications for Erosion -Full depth milling and filling of existing asphalt pavements,replacement of and Sediment Control,to prevent the exposed soil from eroding.The materials can concrete pavement slabs,and similar work that does not expose soil or disturb the include,but are not limited to,mulch,seed and mulch,and erosion control mats(e.g.jute bottom six(6)inches of subbase material, twisted yarn,excelsior wood fiber mats). -Long-term use of equipment storage areas at or near highway maintenance facilities, Total Maximum Daily Loads(TMDLs)-A TMDL is the sum of the allowable loads of a -Removal of sediment from the edge of the highway to restore a previously single pollutant from all contributing point and nonpoint sources.It is a calculation of the existing sheet-flow drainage connection from the highway surface to the highway maximum amount of a pollutant that a waterbody can receive on a daily basis and still ditch or embankment, meet water quality standards,and an allocation of that amount to the pollutants sources. -Existing use of Canal Corp owned upland disposal sites for the canal,and A TMDL stipulates wasteload allocations(WLAs)for point source discharges,load -Replacement of curbs,gutters,sidewalks and guide rail posts. allocations(LAs)for nonpoint sources,and a margin of safety(MOS). Site limitations—means site conditions that prevent the use of an infiltration technique Trained Contractor-means an employee from the contracting(construction)company, and or infiltration of the total WQv.Typical site limitations include:seasonal high identified in Part I II.A.6.,that has received four(4)hours of Department endorsed training groundwater,shallow depth to bedrock,and soils with an infiltration rate less than 0.5 in proper erosion and sediment control principles from a Soil and Water Conservation inches/hour.The existence of site limitations shall be confirmed and documented using District,or other Department endorsed entity.After receiving the initial training,the trained actual field testing(i.e.test pits,soil borings,and infiltration test)or using information from contractor shall receive four(4)hours of training every three(3)years. the most current United States Department of Agriculture(USDA)Soil Survey for the County where the project is located. It can also mean an employee from the contracting(construction)company,identified in Part III.A.6.,that meets the qualified inspector qualifications(e.g.licensed Professional Sizing Criteria—means the criteria included in Part I.C.2 of the permit that are used to Engineer,Certified Professional in Erosion and Sediment Control(CPESC),Registered size post-construction stormwater management control practices.The criteria include; Landscape Architect,or someone working under the direct supervision of,and at the Water Quality Volume(WQv),Runoff Reduction Volume(RRv),Channel Protection same company as,the licensed Professional Engineer or Registered Landscape Volume(Cpv),Overbank Flood(Qp),and Extreme Flood(Qf). Architect,provided they have received four(4)hours of Department endorsed training in proper erosion and sediment control principles from a Soil and Water Conservation State Pollutant Discharge Elimination System(SPDES)-means the system District,or other Department endorsed entity). established pursuant to Article 17 of the ECL and 6 NYCRR Part 750 for issuance of permits authorizing discharges to the waters of the state. The trained contractor is responsible for the day to day implementation of the SWPPP. Steep Slope—means land area with a Soil Slope Phase that is identified as an E or F,or Uniform Procedures Act(UPA)Permit-means a permit required under 6 NYCRR Part 41 42 621 of the Environmental Conservation Law(ECL),Article 70. APPENDIX B Water Quality Standard-means such measures of purity or quality for any waters in Required SWPPP Components by Project Type relation to their reasonable and necessary use as promulgated in 6 NYCRR Part 700 et seq. Table 1 CONSTRUCTION ACTIVITIES THAT REQUIRE THE PREPARATION OF A SWPPP THAT ONLY INCLUDES EROSION AND SEDIMENT CONTROLS The following construction activities that involve soil disturbances of one(1)or more acres of land,but less than five(5)acres: • Single family home not located in one of the watersheds listed in Appendix C or not directly discharging to one of the 303(d)segments listed in Appendix E • Single family residential subdivisions with 25%or less impervious cover at total site build-out and not located in one of the watersheds listed in Appendix C and not directly discharging to one of the 303(d)segments listed in Appendix E • Construction of a barn or other agricultural building,silo,stock yard or pen. The following construction activities that involve soil disturbances of one(1)or more acres of land: • Installation of underground,linear utilities;such as gas lines,fiber-optic cable,cable TV, electric,telephone,sewer mains,and water mains • Environmental enhancement projects,such as wetland mitigation projects,stormwater retrofits and stream restoration projects • Bike paths and trails • Sidewalk construction projects that are not part of a road/highway construction or reconstruction project • Slope stabilization projects • Slope Flattening that changes the grade of the site,but does not significantly change the runoff characteristics • Spoil areas that will be covered with vegetation • Land clearing and grading for the purposes of creating vegetated open space(i.e. recreational parks,lawns,meadows,fields),excluding projects that alter hydrology from pre to post development conditions • Athletic fields(natural grass)that do not include the construction or reconstruction of impervious area and do not alter hydrology from pre to post development conditions • Demolition project where vegetation will be established and no redevelopment is planned • Overhead electric transmission line project that does not include the construction of permanent access roads or parking areas surfaced with impervious cover • Structural practices as identified in Table II in the"Agricultural Management Practices Catalog for Nonpoint Source Pollution in New York State",excluding projects that involve soil disturbances of less than five acres and construction activities that include the construction or reconstruction of impervious area The following construction activities that involve soil disturbances between five thousand(5000) square feet and one(1)acre of land: • All construcfion activifies located in the watersheds identified in Appendix D that involve soil disturbances between five thousand(5,000)square feet and one(1)acre of land. 43 44 Table 2 APPENDIX C CONS-MUC-RON ACTVITIES THAT REQUIRE THE PREPARATION OF A SWPPP THAT INCLUDES POST-CONSTRUCTION STORMWATER MANAGEMENT PRACTICES Watersheds Where Enhanced Phosphorus Removal Standards Are Required The following construction activities that involve soil disturbances of one(1)or more acres of land: Watersheds where owners or operators of construction activities identified in Table • Single family home located in one of the watersheds listed in Appendix C or directly 2 of Appendix B must prepare a SWPPP that includes post-construction discharging to one of the 303(d)segments listed in Appendix E stormwater management practices designed in conformance with the Enhanced • Single family residential subdivisions located in one of the watersheds listed in Appendix C Phosphorus Removal Standards included in the technical standard,New York or directly discharging to one of the 303(d)segments listed in Appendix E State Storm Water Management Design Manual("Design • Single family residential subdivisions that involve soil disturbances of between one(1)and g g ( g Manual"). five(5)acres of land with greater than 25%impervious cover at total site build-out • Single family residential subdivisions that involve soil disturbances of five(5)or more acres of land,and single family residential subdivisions that involve soil disturbances of less than five(5)acres that are part of a larger common plan of development or sale that will ultimately disturb five or more acres of land •Entire New York City Watershed located east of the Hudson River-Figure 1 • Multi-family residential developments;includes townhomes,condominiums,senior housing •Onondaga Lake Watershed-Figure 2 complexes,apartment complexes,and mobile home parks •Greenwood Lake Watershed-Figure 3 • Airports •Oscawana Lake Watershed—Figure 4 • Amusement parks • Campgrounds •Kinderhook Lake Watershed—Figure 5 • Cemeteries that include the construction or reconstruction of impervious area(>5%of disturbed area)or alter the hydrology from pre to post development conditions • Commercial developments • Churches and other places of worship • Construction of a barn or other agricultural building(e.g.silo)and structural practices as identified in Table II in the"Agricultural Management Practices Catalog for Nonpoint Source Pollution in New York State"that include the construction or reconstruction of impervious area,excluding projects that involve soil disturbances of less than five acres. • Golf courses • Institutional,includes hospitals,prisons,schools and colleges • Industrial facilities,includes industrial parks • Landfills • Municipal facilities;includes highway garages,transfer stations,office buildings,POTW's and water treatment plants • Office complexes • Sports complexes • Racetracks,includes racetracks with earthen(dirt)surface • Road construction or reconstruction • Parking lot construction or reconstruction • Athletic fields(natural grass)that include the construction or reconstruction of impervious area(>5%of disturbed area)or alter the hydrology from pre to post development conditions • Athletic fields with artificial turf • Permanent access roads,parking areas,substations,compressor stations and well drilling pads,surfaced with impervious cover,and constructed as part of an over-head electric transmission line project,wind-power project,cell tower project,oil or gas well drilling project,sewer or water main projector other linear utility project • All other construction activities that include the construction or reconstruction of impervious area or alter the hydrology from pre to post development conditions,and are not listed in Table 1 45 46 Figure 1-New York City Watershed East of the Hudson Figure 2-Onondaga Lake Watershed :L--'< AN �,,, es- CLAY CICERO )--"gC EAST FISHKILL �'•, PkW'ilr.+G Irr VAN BUREN µr� US� � L! • ` `. 'ATTERSC]N NkiUS �/� NitEAST i SE SO THEAST . 1111 PUT AM VALL• A 9UBSTEft• LBRIDG=�. MUS r�.. -- C R MEL i SYFlA4`U- fr3' 11 CC. DJWITr a* N 0RTH SALEM `. ELLUS. - - SOMERS TEL S ONONDAGA • WISBOR• f EDFORD _. iAOUN CO ., II RIDG-. I -. LAFAY E 44 �t "N CASTLE t�RTH CAS l OTISCO I . 11111111 PAFF•.D limo U^+ EASAN7 - ._1111 �'- TULLY ' HA .SON EOH Vualershed I I ph.sphorus Wale .e. UPI REBLE 47 48 Figure 3-Greenwood Lake Watershed Figure 4-Oscawana Lake Watershed PHILIPSTOWN WARWICK _._ t; KENT PUTNAM VALLEY GREENWOOD\ .___,,,,,5 • LAKE OSCAWANA LAKE 0 Phosphorus Watershed _ I CARMEL 1 1 Phosphorus Watershed 49 50 Figure 5:Kinderhook Lake Watershed APPENDIX D Watersheds where owners or operators of construction activities that involve soil disturbances between five thousand(5000)square feet and one(1)acre of land SAND LAKE must obtain coverage under this permit. EAST GREENBUSH yyi Entire New York City Watershed that is located east of the Hudson River-See Figure I 1 in Appendix C NAssAu SCHODACK 4 NEW LEBANON KINDERHOOK CHATHAM CANAAN ;'VALANE , 1 _-_---Yawn,Uillage,uGly Carttluy br N9r MrF Srefe o 1 2 l'''- 1 r.Yc1 I wnd.00.I,.watershed 51 52 APPENDIX E APPENDIX E List of 303(d)segments impaired by pollutants related to construction activity(e.g.silt,sediment List of 303(d)segments impaired by pollutants related to construction activity,cont'd. or nutrients).Owners or operators of single family home and single family residential subdivisions COUNTY WATERBODY COUNTY WATERBODY with 25%or less total impervious cover at total site build-out that involve soil disturbances of one or more acres of land,but less than 5 acres,and directly discharge to one of the listed segments Onondaga Onondaga Creek,Middle and fibs Suffolk Great South Bay,West below shall prepare a SWPPP that includes post-construction stormwater management practices Onondaga Onondaga Creek,Upp,and minor tribs Suffolk Mill and Seven Ponds onontlaga Harbor Brook,Lower,and fibs Suffolk Moriches Bay,East designed in conformance with the New York State Stormwater Management Design Manual Onondaga Ninemile Creek,Lower,and tribs Suffolk Moriches Bay,West ("Design Manual"),dated January 2015. Onondaga Minor tribs to Onondaga Lake Suffolk Quantuck Bay Onondaga Onondaga Creek,Lower,and tribs Suffolk Shinnecock Bay(and Inlet) Ontario Honeoye Lake Sullivan Bodine,Montgomery Lakes COUNTY WATERBODY COUNTY WATERBODY Ontario Hemlock Lake Outlet and minor tribs Sullivan Davies Lake Ontario Great Brook and minortribs Sullivan Pleasure Lake Albany Ann Lee(Shakers)Pond,Stump Pond Greene Sleepy Hollow Lake Orange Monhagen Brook and tribs Sullivan Swan Lake Albany Basic Creek Reservoir Herkimer Steele Creek tribs Orange Orange Lake Tompkins Cayuga Lake,Southern End Allegheny Amity Lake,Saunders Pond Kings Hendrix Creek Orleans Lake Ontario Shoreline,Western Tompkins Owasco Inlet,Upper,and tribs Bronx Van Cortlandt Lake Lewis Mill Creek/South Branch and bibs Oswego Pleasant Lake Ulster Ashokan Reservoir Broome Whitney Point Lake/Reservoir Livingston Conesus Lake Oswego Lake Neatahwanta Ulster Esopus Creek,Upper,and minor Broome Fly Pond,Deer Lake Livingston Jaycox Creek and tribs Putnam Oscawana Lake tribs Broome Minor Tribs to Lower Susquehanna Livingston Mill Creek and minor tribs Putnam Palmer Lake Ulster Esopus Creek,Lower,Main Stem (north) Livingston Grainer Creek and tribs Putnam Lake Carmel Ulster Esopus Creek,Middle,and minor Cattaraugus Allegheny River/Reservoir Livingston Christie Creek and tribs Queens Jamaica Bay,Eastern,and tribs(Queens) tribs Cattaraugus Case Lake Monroe Lake Ontario Shoreline,Western Queens Bergen Basin Warren Lake George Cattaraugus Linlyco/Club Pond Monroe Mill Blue Pond Outlet and tribs Queens Shellbank Basin Warren Tribs to L.George,Village of L Cayuga Duck Lake Monroe Rochester Embayment-East Rensselaer Nassau Lake George Chautauqua Chautauqua Lake,North Monroe Rochester Embayment-West Rensselaer Snyders Lake Warren Huddle/Finkle Brooks and tribs Chautauqua Chautauqua Lake,South Monroe Unnamed Trib to Honeoye Creek Richmond Grasmere,Arbutus and Wolfes Lakes Warren Indian Brook and tribs Chautauqua Bear Lake Monroe Genesee River,Lower,Main Stem Rockland Congers Lake,Swartout Lake Warren Hague Brook and tribs Chautauqua Chadakoin River and tribs Monroe Genesee River,Middle,Main Stem Rockland Rockland Lake Washington Tribs to L.George,East Shr Lk Chautauqua Lower Cassadaga Lake Monroe Black Creek,Lower,and minor tribs Saratoga Ballston Lake George Chautauqua Middle Cassadaga Lake Monroe Buck Pond Saratoga Round Lake Washington Cossayuna Lake Chautauqua Findley Lake Monroe Long Pond Saratoga Dwaas Kill and tribs Washington Wood Cr/Champlain Canal,minor Clinton Great Chazy River,Lower,Main Stem Monroe Cranberry Pond Saratoga Tribs to Lake Lonely tribs Columbia Kinderhook Lake Monroe Mill Creek and tribs Saratoga Lake Lonely Wayne Port Bay Columbia Robinson Pond Monroe Shipbuilders Creek and tribs Schenectady Collins Lake Wayne Marbletown Creek and tribs Dutchess Hillside Lake Monroe Minor tribs toluoit Bay Schenectady Duane Lake Westchester Lake Katonah Dutchss eWappinger Lakes Monroe Thomas Creekowekhitehite Brook and tribs Schenectady Mariaville Lake Westchester Lake Mohegan Dutchess Fall FOIL and tribs Nassau Glen Cove Creek,Lower,and tribs Schoharie Engleville Pond Westchester Lake Shenorock Erie Green Lake Nassau LI Tribs(fresh)to East Bay Schoharie Summit Lake Westchester Reservoir No.1(Lake Isle) Erie Scajaquada Creek,Lower,and tribs Nassau East Meadow Brook,Upper,and tribs Schuyler Cayuta Lake Westchester Saw Mill River,Middle,and tribs Erie Scajaquada Creek,Middle,and tribs Nassau Hempstead Bay St.Lawrence Fish Creek and minor tribs Westchester Silver Lake Erie Scajaquada Creek,Upper,and tribs Nassau Hempstead Lake St.Lawrence Black Lake Outlet/Black Lake Westchester Teatown Lake Erie Rush Creek and tribs Nassau Grant Park Pond Steuben Lake Salubria Westchester Truesdale Lake Erie Ellicott Creek,Lower,and tribs Nassau Beaver Lake Steuben Smith Pond Westchester Wallace Pond Erie Beeman Creek and tribs Nassau Camaans Pond Suffolk Millers Pond Westchester Peach Lake Halls Murder Creek,Lower,and tribs Nassau Halls Pontl Suffolk Mattituck(Marratooka)Pond Westchester Mamaroneck River,Lower Erie South Branch Smoke Cr,Lower,and Nassau LI Tidal Tribs to Hempstead Bay Suffolk Tidal tribs to West Moriches Bay Westchester Mamaroneck River,Upp,and tribs tribs Nassau Massapequa Creek and tribs Suffolk Canaan Lake Westchester Sheldrake River and tribs Erie Little Sister Creek,Lower,and tribs Nassau Reynolds Channel,east Suffolk Lake Ronkonkoma Westchester Blind Brook,Lower Essex Lake George(primary county:Warren) Nassau Reynolds Channel,west Suffolk Beaverdam Creek and tribs Westchester Blind Brook,Upper,and tribs Genesee Black Creek,Upper,and minor tribs Nassau Silver Lake,Lofts Pond Suffolk Big/Little Fresh Ponds Westchester Lake Lincolndale Genesee Tonawanda Creek,Middle,Main Stem Nassau Wooem ere Channel Suffolk Fresh Pond Westchester Lake Meahaugh Genesee Oak Orchard Creek,Upper,and tribs Niagara Hyde Park Lake Suffolk Great South Bay.East Wyoming Java Lake Genesee Bowen Brook and bibs Niagara Lake Ontario Shoreline,Western Suffolk Great South Bay.Middle Wyoming Silver Lake Genesee BigelowkCreek,Crkand tribs Niagara Ballo oltz,Nil Creeks and tribs Note:The list above identifies those waters from the final New York State"2014 Section 303(d)List of Genesee Black Middle,and minortribs OneidaodBallon,Nail () Genesee LeRoy Reservoir Onondaga Ley Creek and tribs Impaired Waters Requiring a TMDL/Other Strategy',dated January 2015,that are impaired by silt, Greene Schoharie Reservoir Onondaga Onondaga Creek,Lower and tribs sediment or nutrients. 53 54 APPENDIX F LIST OF NYS DEC REGIONAL OFFICES Region COVERING THE DIVISION OF DIVISION OF WATER FOLLOWING ENVIRONMENTAL (DOW) COUNTIES: PERMITS(DEP) PERMIT ADMINISTRATORS WATER(SPDES) PROGRAM NASSAU AND SUFFOLK 50 CIRCLE ROAD 50 CIRCLE ROAD STONY BROOK,NY 11790 STONY BROOK,NY 11790-3409 TEL(631)444-0365 TEL(631)444-0405 2 BRONX KINGS,NEWYORK, i HUNTERS POINT PLAZA, 1 HUNTERS POINT PLAZA, QUEENS aeo RICHMOND 474021 ST ST. 474021ST ST. LONG ISLAND CITY,NY 11101-5407 LONG ISLAND CITY,NY 11101-5407 TEL(718)482-4997 TEL(718)482-4933 3 Durc HESS,ORANGE,PUTNAM, 21 SOUTH PUTT CORNERS ROAD 100 HILLSIDE AVENUE,SUITE 1W ROCKLAND,SULLIVAN,ULSTER NEWPALTZ,NY 12561-1696 WHITE PLAINS,NY 10603 AND WESTCHESTER TEL(845)258-3059 TEL 1914)428-2505 4 ALBANY,CoLUIaiA, 1150 NORTH WESTCOTT ROAD 1130 NORTH WESTCOTT ROAD DELAWARE,GREENE, SCHENECTADY,NY 12308-2014 SCHENECTADY,NY 12308-2014 MOeTGoIERY,OTSEGO, TEL(518)357-2069 TEL(518)357-2045 RENSSELAER,SCHENECTADY AND SCHOHARIE 5 CLINTON,ESSEX,FRANKLIN, 1115 STATE ROUTE 86,P0 BOX 296 232 GOLF COURSE ROAD FULTON,HAMILTON, RAY BROOK,NY 12977-0296 WARRENSBURG,NY 12885-1172 SARATOGA,WARREN AND TEL(518)897-1234 TEL(518)623-1200 WASHINGTON 6 HERKIMER,JEFFERSON, STATE OFFICE BUILDING STATE OFFICE BUILDING LEWIS,ONEIDA AND 317 WASHINGTON STREET 207 GENESEE STREET ST.LAWRENCE WATERTOWN,NY 13601-3787 UTICA,NY 13501-2885 TEL 1315)785-2245 TEL 1315)793-2554 7 BROOME,CAYUGA, 615 ERIE BLVD.WEST 615 ERIE BLVD.WEST CHENANGO,CORTLAND, SYRACUSE,NY 13204-2400 SYRACUSE,NY 13204-2400 MADISON,ONONDAGA, TEL 1315)428-7438 TEL 1315)428-7500 OSWEGO,TIOGA AND TOMPKINS 8 CHEMUNG,GENESEE, 6274 EAST AVON-LIMA ROAD 6274 EAST AVON-LIMA RD. LIVINGSTON,MONROE, AVON,NY 14414-9519 AVON,NY 14414-9519 ONTARIO,ORLEANS, TEL(585)228-2466 TEL(585)228-2466 SCHUYLER,SENECA, STEUBEN,WAYNE AND YATES 9 ALLEGANY, 270 MICHIGAN AVENUE 270 MICHIGAN AVE. CATTARAUGUS, BUFFALO,NY 14203-2999 BUFFALO,NY 14203-2999 CHAUTAUQUA,ERIE, TEL(716)851-7165 TEL(716)851-7070 NIAGARA AND WYOMING 55 Appendix G Historic Preservation/Endangered Species Documentation 10/7/2019 Cultural Resource Information System(CRIS) ruts R. s HOME SUBMIT SEARCH COMMUNICATE , e 1 Utll 1 4„ Y s\ petithe w dL La{k1To1} �. alk C. """"L 0 150 300ft ra % Ne) https://cris.parks.ny.gov 1/1 <NEWYORK Parks, Recreation, STATE OF ORTUNITY and Historic Preservation ANDREW M. CUOMO ERIK KULLESEID Governor Commissioner November 25, 2019 Mrs. Jennifer Geraghty Hartgen Archeological Associates 1744 Washington Avenue Ext Rensselaer, NY 12144 Re: DEC Skidmore College Fitness and Tennis Center City of Saratoga Springs, Saratoga County, NY 19PR07574 Dear Mrs. Geraghty: Thank you for requesting the comments of the Division for Historic Preservation of the Office of Parks, Recreation and Historic Preservation (OPRHP). We have reviewed the submitted project information in accordance with the New York State Historic Preservation Act of 1980 (Section 14.09 of the New York Parks, Recreation and Historic Preservation Law). These comments are those of the OPRHP and relate only to Historic/Cultural resources. They do not include potential environmental impacts to New York State Parkland that may be involved in or near your project. Such impacts must be considered as part of the environmental review of the project pursuant to the State Environmental Quality Review Act (New York Environmental Conservation Law Article 8) and its implementing regulations (6 NYCRR Part 617). We note that the project boundary partially overlaps the Broadway Historic District Expansion building district (09140.001531; 93NR00472). Based on the project details, our Technical Services Unit does not have any concerns with impacts to this National Register listed historic resource. We are in receipt of the archaeology survey report (Phase I Archeological Investigation, Skidmore College Fitness and Tennis Center, Skidmore College, 815 North Broadway, City of Saratoga Springs, Saratoga County, New York) by Hartgen Archeological Associates, Inc. and dated October 2019. The survey did not identify any archaeological sites within the project's Area of Potential Effects (APE), and the OPRHP concurs with the recommendation that additional archaeological investigation is not warranted. Based on this review, it is the OPRHP's opinion that this project will have No Adverse Impact on archaeological and/or historic resources listed in or eligible for the New York State and National Registers of Historic Places. If you have any questions, please do not hesitate to contact me at 518.268.2185 or andrew.farry@parks.ny.gov. Sincerely, � a Andrew Farry, Ph.D. Scientist/Archaeology cc: Bradley Russell, Hartgen; Donald McPherson, LA Group Division for Historic Preservation P.O. 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