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HomeMy WebLinkAbout20200574 Excelsior Park SUP Engineering Report 2-7-20 The LA GROUP Landscape ArchitecLige ture�.Engineering P.C. People.Purpose.PCuee. 40 ng Saratoga Spring NYL° 12866Alleys p:518-587-8100 l`518-587-0180 Engineering www Water and Sanitary Sewer For EXCELSIOR PARK SPECIAL USE PERMIT EXCELSIOR AVENUE SARATOGA SPRINGS, NEW YORK Planning Board #18.056 Prepared For Excelsior Park LLC 563 North Broadway Saratoga Springs, NY 12866 Contact: John Witt Prepared By The LA Group, P.C. 40 Long Alley Saratoga Springs, New York 12866 1 /1 h/ f �4.f: / 1: ''4tZ November 9, 2017 , j j/ Revised February 7,2020 o�ii�ii i i i ii ///"o°o°o° iii,�,,.,<,.. Engineering Report Excelsior Park Special Use Permit Saratoga Springs, New York 2016046 L Introduction The application is for securing a Special Use Permit for 34.72 acres of land on Excelsior Avenue and Ormandy Lane. The development is commonly referred to as Excelsior Park. The Special Use Permit will include a mix of residential and commercial uses, including a hotel, spa, community center and swimming pool. Municipal water and sewer exist in Excelsior Avenue, Ormandy Lane, Whistler Court and Gibson Court within the boundary of the property. These utilities were constructed during phases one and two of the development. Water will be supplied for domestic and fire protection from the 8-inch main on Excelsior Avenue, Ormandy Avenue and Whistler Court which loops through the development and eventually connects to 12-inch mains owned by the City of Saratoga Springs. For sanitary sewer collection, new gravity sewer networks of pipes and manholes will connect to the existing 8-inch gravity sanitary sewer main in Excelsior Avenue. This existing main flows to a pump station that was designed and installed in phase one to serve the full development. The pump station is located at the intersection of Excelsior Avenue and Ormandy Drive and is owned and maintained by the City of Saratoga Springs. The pump station directs flows from the development through a 6-inch force main along Ormandy Drive to Excelsior Avenue and connects to an existing manhole at the intersection of Excelsior Avenue and Veterans Way. This manhole is owned by Saratoga County Sewer District No. 1. II. Project Description The remaining build-out covered by the Special Use Permit proposes to construct 10 three- bedroom townhouses, 39 two-bedroom townhouses, 24 one-bedroom townhouses, 4 three- bedroom apartment units, 43 two-bedroom apartment units, 38 one-bedroom apartment units, 22,100 square feet of commercial space, a community recreational facility with a swimming pool and a 60-room hotel that includes a 200-seat restaurant, banquet facility for 300 guests, spa and swimming pool. Twelve of the townhouses include a one-bedroom apartment that could be sub- let. Included in the proposal are 9 short-term or guest room rentals. A National Grid overhead electric power line support tower at the southwest corner of the site will need to be protected during construction. Proposed underground utilities will need to maintain a 50-foot minimum setback from the tower. National Grid prefers that water lines be placed outside their permanent easement. 1 Engineering Report Excelsior Park Special Use Permit Saratoga Springs, New York 2016046 III. Existing Water and Sanitary Sewer Utilities Municipal water service is currently provided by the City of Saratoga Springs. According to the Annual Drinking Water Quality Report for 2018, the water system serves approximately 28,000 people through 9,680 service connections. The total water produced in 2018 was 1,530,219,000 gallons. The city's daily average was 4,192,000 gallons. The highest single day consumption was 7,066,000 gallons on July 02, 2018. A 12-inch diameter water main located in Excelsior Avenue tees off to another 12-inch diameter water main located in Ormandy Lane. From the current end of Ormandy Lane, the 12-inch water main continues easterly toward the Adirondack Northway (I-87). This 12-inch water main was tapped for the first phase of the development creating an 8-inch diameter loop from the intersection of Excelsior Avenue and Ormandy Lane to the entrance of the former Federal Express facility on Excelsior Avenue. The first phase included fire hydrants spaced approximately 400 feet apart and several 6-inch water service laterals that were stubbed for future connections. In phases 2 and 2A, the existing 8-inch water main in Excelsior Avenue provided combined fire protection and domestic service laterals to the buildings. Combined fire protection and domestic waterlines were brought to the end of Whistler Court and Gibson Court. A fire hydrant was installed at the end of each branch line to provide fire protection and to allow periodic flushing of the lines. The branch lines are privately owned and maintained. Hydrant flow tests conducted between 1976 and 2014 indicate static pressures in the area of Excelsior Avenue of between 87 and 104 pounds per square inch (psi). During flow tests, hydrants running at approximately 1,200 gallons per minute caused the residual pressure at the test hydrant to drop less than 10 psi giving a theoretical available flow of approximately 4,600 gallons per minute at 20 pounds per square inch (psi). Refer to Attachment A for the Hydrant Fire Flow Test Summary provided by Northeast Fire Protection Systems, Inc. Municipal sanitary sewer service is available from the City of Saratoga Springs at the sanitary sewer main in Excelsior Avenue, Ormandy Lane and Whistler Court. These portions of the municipal collection system were installed as part of original Excelsior Park mixed use development in 2004 and subsequent phases of development. The sewer main runs south on Excelsior Avenue to a municipal pump station near the intersection of Ormandy Lane and Excelsior Avenue. Wastewater is conveyed by this lift station to the Saratoga County Sewer District No. 1 (SCSD) collector at the intersection of Excelsior Avenue and Veteran's Way, and then by gravity to the SCSD Lift Station No. 1 at the intersection of High Rock Avenue and Warren Street. Ultimately the wastewater flows for conveyance and treatment at SCSD's wastewater treatment plant in Mechanicville. 2 Engineering Report Excelsior Park Special Use Permit Saratoga Springs, New York 2016046 IV. Projected Water and Wastewater Flows The table below provides information on the anticipated wastewater flow rates for the entire development: Description Use Rate Total Use (gpd) Existing Condition: Hotel 103 rooms 110 gpd/ea3 11,330 Condominiums-3 BR 30 units 330 gpd/ea3 9,900 Townhouses- 3 BR 18 units 330 gpd/ea3 5,940 Apartments 156 bedrooms 110 gpd/ea3 17.160 Existing Sub-total 44,330 Proposed Condition: Hotel 60 rooms' 110 gpd/ea3 6,600 Restaurant 200 seats' 35 gpd/seat 7,000 Banquet Facility 300 seats' 10 gpd/seat 3,000 Hotel Pool 60 users' 10 gpd/ea2 600 Hotel Spa 60 users' 20 gpd/ea2 1,200 Community Pool 240 users' 10 gpd/ea2 2,400 Community Recreation 160 users' 20 gpd/ea2 3,200 Commercial/Retail 22,100 sf' 0.1 gpd/sf 2,210 Apartments- 1 Bedroom 38 units' 110 gpd/ea3 4,180 Apartments-2 Bedrooms 43 units' 220 gpd/ea3 9,460 Apartments- 3 Bedrooms 4 units' 330 gpd/ea3 1,320 Townhouses- 1 Bedroom 24 units' 110 gpd/ea3 2,640 Townhouses-2 Bedrooms 39 units' 220 gpd/ea3 8,580 Townhouses- 3 Bedrooms 10 units' 330 gpd/ea3 3,300 Short-term Guest Rentals 9 rooms' 110 gpd/ea3 990 Proposed Sub-total 56,680 Grand Total 101,010 1. Room counts,floor areas, restaurant seats,pool users, etc. are estimated based on provided data. 2. From Table B-3,NYSDEC 2014 Design Standards for Wastewater Treatment Systems. 3. From Table 1,NYSDOH Design Standards for Individual Wastewater Treatment Systems. Average daily flow for wastewater is estimated to be 70 gallons per minute (gpm) based on a 24- hour day. Estimated peak hourly flow is 260 gpm (3.71 x average). 3 Engineering Report Excelsior Park Special Use Permit Saratoga Springs, New York 2016046 Average daily demand for water is estimated to be approximately equal to the wastewater flow or 70 gpm. Peak hourly demand is estimated to be approximately equal to the peak hourly wastewater flow or 260 gpm. Peak instantaneous demand is calculated at 1,250 gallons per minute (gpm)based on hotel use of 2 gpm per room, restaurant use of 1 gpm per seat, commercial/retail use of 0.6 gpm per 100 sf, community recreation and swimming pool use of 0.6 gpm per user and residential use based on 293 condos, townhouses and apartments at 1.2 gpm per residence. For the purposes of input into the City of Saratoga Springs water model, we offer the following estimated water demands for the project: • Average Day Demand is 70 gallons per minute (GPM) over the 24-hour period. • Max Day Demand is 140 gallons per minute (GPM)based on twice the average. • Peak Hourly Flow is 260 gallons per minute (GPM)based on 3.71 times the average. • Fire Flow Demand is 1,000 gallons per minute (GPM)per ISO guidelines. V. Proposed Water and Wastewater Utilities Proposed Water Utilities To service the project, the existing 8-inch water mains in Excelsior Avenue and Whistler Court and the existing 12-inch water main in Ormandy Lane will provide combined fire protection and domestic service laterals to the proposed buildings. Most of the new buildings will be served directly from the existing water mains from either stubbed existing service laterals or new services. Two minor water main branches will provide individual water services to the townhouse units. The branch lines will be privately owned and maintained. The water services proposed for the residential buildings are 3/4-inches in diameter. Each privately owned townhouse unit will be metered separately. A fire hydrant will be installed on the Ormandy Lane water main east of the Excelsior Avenue intersection. Needed Fire Flow (NFF) calculations using the ISO Guide for Determination of Needed Fire Flow are presented in Attachment B. The calculation shows a NFF of 750 gallons per minute. This calculation is for a non-sprinklered building. For a building protected by an automatic fire sprinkler system, the ISO states: "The NFF for residential occupancies (such as apartment buildings, lodgings and rooming houses, board and care facilities, hotels, motels and dormitories) protected by an automatic fire sprinkler system installed in accordance with the general criteria of 4 Engineering Report Excelsior Park Special Use Permit Saratoga Springs, New York 2016046 NFPA 13R, Standard for the Installation of Sprinkler Systems in Residential Occupancies up to and including Four-Stories in Height, is the demand at the base of the automatic sprinkler riser". "The minimum NFF is 1,000 gpm at 20 psi for a duration of 2 hours". Using the minimum given by ISO, the NFF for this facility is 1,000 gpm. The hydrant flow test data indicates approximately 4,600 gpm at 20 psi. Based on this information, there is adequate fire protection water supply available at the site. Connections and appurtenances, including tapping sleeves and valves, mechanical joints, tees, isolation valves, fire hydrants, thrust blocks, trenching, bedding, service connections, as well as testing and disinfection will all be specified in accordance with City of Saratoga Springs standards. The applicant will offer the water system to the City of Saratoga Springs for ownership and maintenance. If accepted, utility easements will be provided as required. Proposed Wastewater Utilities Sanitary service will be provided by using existing sewer lateral stubs, installing new 6-inch PVC gravity sewer laterals and installing new 8-inch PVC gravity sewer mains and manholes. The new lines will be installed at a slope to provide adequate cleansing velocity in the pipe. Manholes,pipe, trenching, bedding, service connections, and testing will be specified in accordance with City of Saratoga Springs and Saratoga County Sewer District minimum standards. The applicant will offer the sanitary sewer system to the City of Saratoga Springs for ownership and maintenance. If accepted, utility easements will be provided as required. Existing Pump Station Capacity The City Engineer will be contacted to verify if their system has adequate capacity to accommodate the project's sanitary flow. In addition, the pump station operator is looking into any concerns the City may have with the operation of the existing pump station. The pump station was originally designed to handle design flows of 110,540 gpd. Peak hourly flow which the pump station was designed for is estimated at: (110,540 gpd/ 1,440 minutes per day) x 3.88 peaking factor =297.8 gpm. We will round up to 300 gpm for this analysis. 5 Engineering Report Excelsior Park Special Use Permit Saratoga Springs, New York 2016046 Total existing phase lsanitary flows are estimated to be 21,230 gpd which is approximately 20% of the full build-out design flow. Adding the phase 2 and phase 2A projected flows of 23,100 gpd to the existing estimated flows of 21,230 gpd gives a total of 44,330 gpd after completion of phase 2A. This is approximately 40% of the full build-out design flow. At full build-out, sanitary flows are estimated to be 101,010 gpd which is 970 gpd more than the original design and within a reasonable margin of error considering the broad nature of these flow estimates. Peak hourly flow after completion of the full build-out is estimated to be 260 gpm using a peaking factor of 3.71. The original pump station was designed based on a peak hourly flow of approximately 300 gpm. The pumps that were originally installed (Flygt CP3127 submersible with 484 impellers) discharge at a rate of approximately 300 gpm at a total dynamic head of 48 feet. This rate will provide a force main cleansing velocity of 3.4 feet per second. Pending verification from the City that the existing pump station is operating as originally designed; the additional daily and peak flows generated with the full build-out of Excelsior Park will be within an acceptable range for the municipal pump station. Notes 4. From Table 1,Appendix 75-A Wastewater Treatment Standards-Residential Onsite Systems (110 gallons per day per bedroom) 5. From Figure 1, GLUMRB Recommended Standards for Wastewater Facilities Q=(18+P'/2) ÷(4 +P'/2) where P=population in thousands 3. From Table XXl, Community Water Systems Source Book,Ameen. Attachments Attachment A Hydrant Flow Test Data Attachment B Needed Fire Flow (NFF) Calculations Attachment C Water Demand Calculations Attachment D Sanitary Sewer Use Calculations 6 ATTACHMENT A HYDRANT FLOW TEST DATA 2 O0. CO Lr)J � 4,. O 4 O "cf. � L N W }- Q • a o ac°i o CO rn C) rn o COCV co co cNv CO rn CO O a d• Q N (D Nin N (7 (O r T1- in 'w • U- m Lrn a�, rnm0)C) • � O o O O Q O Z U) I- 2 0 a Co I-0 uu) co co CO 4 ~' H u.r J r NLt-.) 1.0 u7 in CD Ln Q N N Ni N N N N N( r, LL z o LL N N N N8CO CA i- a) OSS 0 O O C a) (0 N W Q O N_ N r Cr)CO a .zr t rf (D CO N N Q r a0 C3>- 0 SC C GL U w Z Z Z W CC zn_ 0 (.7 cLi � N I- (D Q d (D I.L Z o W o N r22 z H w z < Q o cc rx o YUQwNct Q (JU' Z Z © (t3} 0,5 Q L J W W w W W W (t3} Ud ¢ Q Q Q Q Q 0000000000 000000000 _ _ _ _ _ _ _ U � _J _J JJ W W W W w W LU W W w O 0 (..) 0 o U 0 U U X X XXX X X XXX W W W w W W W W W W ATTACHMENT B NEEDED FIRE FLOW(NFF) CALCULATIONS PREPARED BY: D. Desjardins DATE 09/20/17 CHECKED BY: DATE The LPA GROUP SUBJECT: Excelsior Park SUP - ISO NFF Calculations Landscape Architecture®.Engineering P PROJECT NUMBER: 2016046 SHEET 1 OF 1 Assumptions: Building is 2 stories with basement. Wood frame construction. Residential townhomes. Largest townhouse unit is 24'x 40'or 960 SF. Nonsprinklered building. References: 1. Insurance Services Office (ISO) Guide for Determination of Needed Fire Flow Edition 06-2014 Needed Fire Flow Formula: NFF; =(CI)(0I)[1.0 + (X+ P)1] where: NFF =the needed fire flow in gallons per minute C; = a factor related to the type of construction and effective area O; = a factor related to the type of occupancy X = a factor related to the exposure hazard of adjacent buildings P = a factor related to the communication hazard with adjacent buildings CONSTRUCTION TYPE Construction Class 1 (wood frame construction) Construction type coefficient (F) = 1.5 (Chapter 2, Reference 1) Effective area (A) = 1,440 SF (960 +960/2) (50% of each additional floor) C = 18F x A112 C = 1,024.58 gpm C = 1,000 gpm (rounded to nearest 250 gpm) OCCUPANCY TYPE Residential (townhomes) Occupancy combustibility class C-2 (Limited Combustibility) Occupancy Factor(0) = 0.85 (Chapter 3, Reference 1) EXPOSURES AND COMMUNICATION Exposure Factor (X) = none (Chapter 4, Reference 1, exception for habitational and sprinklered) Exposure and Communication Factor (X + P) = 0.00 CALCULATION NFF = (C)(0)(1+(X+P)) NFF = 850.00 gpm NFF = 750 gpm (rounded to nearest 250 gpm) G:\Proj-2016\2016046_Excelsior_Special_Use_Permit\2016046Engineering_Data\00Water\2016046 ISO NFF Worksheet ATTACHMENT C WATER DEMAND CALCULATIONS EXCELSIOR PARK SPECIAL USE PERMIT 2/7/2020 SARATOGA SPRINGS, NY CALCULATIONS FOR FULL BUILD-OUT WATER DEMANE DETERMINE DAILY AVERAGE AND PEAK HOURLY DEMANE EXISTING CONDITION: HOTEL: NO. OF ROOMS 103 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) * Qa = 11,330 GPD CONDOMINIUMS: NO. OF 3-BR UNITS 30 EA DESIGN FLOW = 330 GPD/EA (NYSDEC) * Qb = 9, 900 GPD APARTMENTS: NO. OF BEDROOMS 156 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) * Qc = 17, 160 GPD TOWNHOUSES: NO. OF 3-BR UNITS 18 EA DESIGN FLOW = 330 GPD/EA (NYSDEC) * Qd = 5, 940 GPD EXISTING SUBTOTAL 44,330 GPD (Qa thru Qd) PROPOSED DEVELOPMENT: HOTEL: NO. OF ROOMS 60 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) * Qe = 6, 600 GPD RESTAURANT: NO. OF SEATS 200 EA DESIGN FLOW = 35 GPD/EA (NYSDEC) * Qf = 7,000 GPD BANQUET (WEDDING) : NO. OF SEATS 300 EA DESIGN FLOW = 10 GPD/EA (NYSDEC) * Qg = 3,000 GPD HOTEL POOL: NO. OF USERS 60 EA (1 PER ROOM) DESIGN FLOW = 10 GPD/EA (NYSDEC) * Qh = 600 GPD 1 Attachment C EXCELSIOR PARK SPECIAL USE PERMIT 2/7/2020 SARATOGA SPRINGS, NY HOTEL SPA: NO. OF USERS 60 EA (1 PER ROOM) DESIGN FLOW = 20 GPD/EA (NYSDEC) * Qi = 1,200 GPD COMMUNITY POOL: NO. OF USERS 240 EA (80 USERS x 3) DESIGN FLOW = 10 GPD/EA (NYSDEC) * Qj = 2,400 GPD COMMUNITY RECREATION: NO. OF USERS 160 EA (1/2 PER DWELLING) DESIGN FLOW = 20 GPD/EA (NYSDEC) * Qk = 3,200 GPD COMMERCIAL/RETAIL: BUILDING AREA 22, 100 SF DESIGN FLOW = 0.1 GPD/SF (NYSDEC) * Q1 = 2,210 GPD APARTMENTS: NO. OF 1-BR UNITS 38 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) * Qm1 = 4, 180 GPD NO. OF 2-BR UNITS 43 EA DESIGN FLOW = 220 GPD/EA (NYSDEC) * Qm2 = 9,460 GPD NO. OF 3-BR UNITS 4 EA DESIGN FLOW = 330 GPD/EA (NYSDEC) * Qm3 = 1,320 GPD TOWNHOUSES: NO. OF 1-BR UNITS 24 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) * Qn1 = 2, 640 GPD NO. OF 2-BR UNITS 39 EA DESIGN FLOW = 220 GPD/EA (NYSDEC) * Qn2 = 8,580 GPD NO. OF 3-BR UNITS 10 EA DESIGN FLOW = 330 GPD/EA (NYSDEC) * Qn3 = 3,300 GPD SHORT-TERM GUEST RENTALS: NO. OF ROOMS 9 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) * Qo = 990 GPD PROPOSED SUBTOTAL 56, 680 GPD (Qe thru Qo) GRAND TOTAL 101,010 GPD (Qa thru Qo) 2 Attachment C EXCELSIOR PARK SPECIAL USE PERMIT 2/7/2020 SARATOGA SPRINGS, NY AVG. DAILY DAMAND, Qav = 70 GPM (24 HRS) MAX. DAILY DAMAND, Qmax = 140 GPM (TWICE THE AVG. ) POPULATION 1,350 EA (10-STATE STDS. PAGE PEAKING FACTOR, Qp/Qav 3.71 10-5, FIG. 1, BASED ON PEAK HOURLY FLOW, Qp = 260.2 GPM 75 GPD/PERSON) * NYSDEC 2014 DESIGN STANDARDS TABLE B-3 "Typical Per-Unit Loading Rates' 3 Attachment C EXCELSIOR PARK SPECIAL USE PERMIT 2/7/2020 SARATOGA SPRINGS, NY DETERMINE INSTANTANEOUS DEMAND HOTELS: NO. OF ROOMS 163 EA DESIGN FLOW = 2 GPM/UNIT (AMEEN TABLE XV) ** Qa = 326 GPM RESTAURANT: NO. OF SEATS 200 EA DESIGN FLOW = 1 GPM/SEAT (AMEEN TABLE XV) ** Qb = 200 GPM COMMERCIAL/RETAIL: BUILDING AREA 22, 100 SF DESIGN FLOW = 0.6 GPM/100 SF (AMEEN TABLE XV) ** Qc = 133 GPM COMMUNITY RECREATION: NO. OF USERS 160 EA DESIGN FLOW = 0.6 GPM/MEMBER (AMEEN TABLE XV) ** Qd = 96 GPM COMMUNITY POOL: NO. OF USERS 240 EA DESIGN FLOW = 0.6 GPM/MEMBER (AMEEN TABLE XV) ** Qe = 144 GPM RESIDENTIAL: NO. OF RESIDENCES 293 EA INSTANTANEOUS DEMAND = 1.2 GPM/RESIDENCE*** Qf = 352 GPM TOTAL INSTANTANEOUS 1,250 GPM (Qa thru Qf) ** AMEEN TABLE XV "Instantaneous Water Demands for Commercial Areas" *** AMEEN TABLE XIV "Instantaneous Water Demands for Residential Areas" 4 Attachment C ATTACHMENT D SANITARY SEWER USE CALCULATIONS EXCELSIOR PARK SPECIAL USE PERMIT 1/13/2020 SARATOGA SPRINGS, NY CALCULATIONS FOR SANITARY SEWAGE CAPACITY DETERMINE DAILY AVERAGE AND PEAK HOURLY FLOWS EXISTING CONDITION: HOTEL: NO. OF ROOMS 103 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) Qa = 11, 330 GPD CONDOMINIUMS: NO. OF 3-BR UNITS 30 EA DESIGN FLOW = 330 GPD/EA (NYSDEC) Qb = 9, 900 GPD APARTMENTS: NO. OF BEDROOMS 156 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) Qc = 17, 160 GPD TOWNHOUSES: NO. OF 3-BR UNITS 18 EA DESIGN FLOW = 330 GPD/EA (NYSDEC) Qd = 5, 940 GPD EXISTING SUBTOTAL 44, 330 GPD (Qa thru Qd) PROPOSED DEVELOPMENT: HOTEL: NO. OF ROOMS 60 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) Qe = 6, 600 GPD RESTAURANT: NO. OF SEATS 200 EA DESIGN FLOW = 35 GPD/EA (NYSDEC) Qf = 7,000 GPD BANQUET (WEDDING) : NO. OF SEATS 300 EA DESIGN FLOW = 10 GPD/EA (NYSDEC) Qg = 3,000 GPD HOTEL POOL: NO. OF USERS 60 EA (1 PER ROOM) DESIGN FLOW = 10 GPD/EA (NYSDEC) Qh = 600 GPD 1 Attachment D EXCELSIOR PARK SPECIAL USE PERMIT 1/13/2020 SARATOGA SPRINGS, NY HOTEL SPA: NO. OF USERS 60 EA (1 PER ROOM) DESIGN FLOW = 20 GPD/EA (NYSDEC) Qi = 1,200 GPD COMMUNITY POOL: NO. OF USERS 240 EA (80 USERS x 3) DESIGN FLOW = 10 GPD/EA (NYSDEC) Qj = 2,400 GPD COMMUNITY RECREATION: NO. OF USERS 160 EA (1/2 PER DWELLING) DESIGN FLOW = 20 GPD/EA (NYSDEC) Qk = 3,200 GPD COMMERCIAL/RETAIL: BUILDING AREA 22, 100 SF DESIGN FLOW = 0.1 GPD/SF (NYSDEC) Q1 = 2,210 GPD APARTMENTS: NO. OF 1-BR UNITS 38 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) * Qm1 = 4, 180 GPD NO. OF 2-BR UNITS 43 EA DESIGN FLOW = 220 GPD/EA (NYSDEC) * Qm2 = 9,460 GPD NO. OF 3-BR UNITS 4 EA DESIGN FLOW = 330 GPD/EA (NYSDEC) * Qm3 = 1,320 GPD TOWNHOUSES: NO. OF 1-BR UNITS 24 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) * Qn1 = 2, 640 GPD NO. OF 2-BR UNITS 39 EA DESIGN FLOW = 220 GPD/EA (NYSDEC) * Qn2 = 8,580 GPD NO. OF 3-BR UNITS 10 EA DESIGN FLOW = 330 GPD/EA (NYSDEC) * Qn3 = 3,300 GPD SHORT-TERM GUEST RENTALS: NO. OF ROOMS 9 EA DESIGN FLOW = 110 GPD/EA (NYSDEC) Qo = 990 GPD PROPOSED SUBTOTAL 56, 680 GPD (Qe thru Qo) 2 Attachment D EXCELSIOR PARK SPECIAL USE PERMIT 1/13/2020 SARATOGA SPRINGS, NY GRAND TOTAL 101,010 GPD (Qa thru Qo) MAX. DAILY FLOW, Q = 110,540 GPD (Original Design) AVG. DAILY FLOW, Qav = 70 GPM (24 HRS) POPULATION 1, 350 EA (10-STATE STDS. PAGE PEAKING FACTOR, Qp/Qav 3.71 10-5, FIG. 1, BASED ON 75 GPD/PERSON) PEAK HOURLY FLOW, Qp = 260.2 GPM 3 Attachment D EXCELSIOR PARK SPECIAL USE PERMIT 1/13/2020 SARATOGA SPRINGS, NY WET WELL SIZING CALCULATIONS MINIMUM VOLUME: TWO MINUTE PUMP RUN TIME WITH 2 MIN FM VELOCITY > 2.0 FPS 175 GPM 350 GAL OR THREE MINUTE MINIMUM REST BETWEEN 3 MIN PUMP STARTS AT PEAK FLOW 260 GPM 781 GAL MAXIMUM VOLUME: THIRTY MINUTE DETENTION TIME AT 30 MIN AVERAGE INFLOW 70 GPM 2103 GAL WET WELL INSIDE DIAMETER = 6 FT NO. OF PUMP STARTS PER DAY = 260. 1 GALLONS PER PUMP START = 425 HEIGHT BETWEEN ON-OFF LEVEL WITH 6 FT. DIA. WET WELL : 425 GAL/START/ 211.5 GAL/VLF = 2.01 FT HEAD LOSS CALCULATIONS TOTAL MINOR LOSSES: EQUIV EQUIV. QTY DESCRIPTION SIZE LNGTH LENGTH (IN) (LF) (LF) 1 GATE VALVE 4 2.40 2.40 1 CHECK VALVE 4 31.00 31.00 1 TEE (THROUGH) 4 2.20 2.20 0 TEE (SIDE) 4 10.00 0.00 4 90 DEG. ELBOW 4 4.80 19.20 4 45 DEG. ELBOW 4 2.90 11.60 0 22.5 DEG. ELBOW 4 2.00 0.00 0 11.25 DEG. ELBOW 4 1.00 0.00 1 COUPLING/UNION 4 0.50 0.50 SUB-TOTAL 66.90 PIPE FRICTION LOSSES: 6 - INCH HDPE DR-11 PIPE 2,373 TOTAL PIPE LENGTH 2, 440 SAY 2,440 LF 4 Attachment D EXCELSIOR PARK SPECIAL USE PERMIT 1/13/2020 SARATOGA SPRINGS, NY SYSTEM HEAD LOSS TABLE PIPE SIZE (I.D. )= 6 IN. "C" = 120 "C" = 100 FLOW STC HEAD FR HEAD FR HEAD T.D.H. T.D.H. (GPM) (FT. ) * (FT. ) ** (FT) *** (FT) ** (FT) *** 0 28.0 0.0 0.0 28.0 28.0 100 28.0 3.0 4.2 31.0 32.2 200 28.0 10.8 15.2 38.8 43.2 300 28.0 22.9 32.1 50.9 60.1 400 28.0 39.0 54.6 67.0 82.6 500 28.0 58.9 82.6 86.9 110. 6 600 28.0 82.6 115.7 110. 6 143.7 700 28.0 109.8 153. 9 137.8 181. 9 800 28.0 140. 6 197.0 168. 6 225.0 900 28.0 174.8 244. 9 202.8 272. 9 1000 28.0 212.4 297. 6 240.4 325. 6 1100 28.0 253.4 355.0 281.4 383.0 1200 28.0 297. 6 417. 1 325. 6 445. 1 *DISCHARGE ELEVATION = 280 +/- (HIGH POINT) PUMP ELEVATION = 252 +/- ** BASED ON "C" = 120 & 6 " I.D. HDPE DR-11 PIPE *** BASED ON "C" = 100 & 6 " I.D. HDPE DR-11 PIPE USE FLYGT SUBMERSIBLE SEWAGE PUMP, MODEL NO. NP 3102 MT, 5 HP, THREE PHASE, 460 VAC, 60 HZ. , 1745 RPM. PROGRAM THE VFD TO OPERATE THE PUMP AT 55HZ. PUMP DELIVERY : 300 GPM @ TDH= 48 FT. NOTE: FLYGT SYSTEM SPECIFIED PER SARATOGA CO. SEWER DISTRICT STANDARDS. 5 Attachment D EXCELSIOR PARK SPECIAL USE PERMIT 1/13/2020 SARATOGA SPRINGS, NY CHECK TOTAL TIME BETWEEN PUMP STARTS AT AVG. FLOW: t = V/ (D-Qav) + V/Qav where: t = (TOTAL TIME BTWN STARTS, MIN. ) V = 425 GAL (VOLUME BTWN "OFF AND ON") Qav = 70.1 GPM (AVG. DAILY FLOW) D = 300 GPM (PUMP DELIVERY) t = 7.9 MIN. < 30 MIN. ? CHECK MINIMUM PUMP RUN TIME AT PEAK INFLOW: t = V/ (D-Qp) where: t = (PUMP RUN TIME, MIN. ) V = 425 GAL (VOLUME BTWN "OFF AND ON") Qp = 260.2 GPM (PEAK INFLOW) D = 300 GPM (PUMP DELIVERY) t = 10.7 MIN. >/= 2 MIN. ? CHECK VELOCITY IN FORCE MAIN: Velocity = (D/A) /448.8 GPM where: A = 0.20 SF (PIPE X-SECT AREA) D = 300 GPM (PUMP DELIVERY) Velocity = 3.4 FPS > 2.0 FPS ? 6 Attachment D SYSTEM VS. PUMP CURVE 160.0 140.0 — SYSTEM CURVE C=100 120.0 - -M—SYSTEM CURVE C=120 --PUMP CURVE(1 PUMP) 100.0 --PUMP CURVE(2 PUMPS) — I o 80.0 LL ii. 60.0 V 40.0 ,,i 20.0 0.0 0 100 200 300 400 500 600 700 FLOW(GPM) Flygt Pump Model CP 3127 MT ATTACHMENT D