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20190428 Cherry St/Marvin Alley Condos Engineering Response 7-19-18 Barton tilL :]gguidice July l8, ZOl8 Timothy Wales, P.E., City Engineer City of Saratoga Spring5 474 Broadway Saratoga Springs, New York 12186 Re: 18 Cherry Street/38 Marvin Alley Townhouse P 'ect Engineering Review File: 539.045.001 Dear Mr. Wales: Barton & Loguidice, D.P.C. (B&L) has completed a review of the following reports and information for the 18 Cherry Street P 'ect located at 18 Cheery Street and Marvin Alley proposed by Anthony Maney. Application for Site Plan Review; • Full Environmental Assessment Form (FEAF) undated and unsigned; • Cost Estimate for Letter of Credit dated June 7, 2018; • Engineering Report for Water and Sanitary Sewer dated June 6, 2018 as prepared by Cedarwood Engineering Services; • Stormwater Pollution Prevention Plan (SWPPP) dated June 7, 2018 as prepared by Studio A, Landscape Architecture, DPC; w Plan Set (17 Sheets) dated June 17, 2018 as prepared by Studio A, Landscape Architecture, DPC; * Narrative as prepared by Studio A, Landscape Architecture, DPC, undated; e City of Saratoga Springs Complete Streets Checklist; • New Water Service Agreement and Application. This reviewwas conducted on behalf of the City of Saratoga Springs. The above referenced documents and information were reviewed only with respect to our scope outlined in our task order/proposal. Th experience to listen The powerto 10 Airline Suite 200_4lbany,NY 12205 Office:518-218-1801 Fax:513-218-1805" BartonanciLogoiclice.corn solve q) Timothy WalesP.E, City Engineer City of Saratoga Springs July 19, 2018 &Li Page 2 General 1. Has the p 'ectreceivedanycorrespondencefromnorcoordinatedwvithNYSSHPOin regard to the existing NYS Heritage areas or nearby historic district? 2. The Utility-As Built plan sheet included in the water and sewer report prepared by Thompson Fleming dated April 15, 2016 showed an 18' wide strip to be conveyed to the City of Saratoga Springs but is not reflected on the survey or plans? Please confirm this conveyance occurred and revise plans if it exists. Does this effect setback distance required or covered by variance? 3. City Zoning Board conditions no accessory structures are allowed for this project. See cover sheet. 4. Provide stamped plans including survey. Water and Sanitary Sewer 1. Add statement that existing system can provide sufficient quantity and flow rate for sprinkler systems from existing system without fire pumping to boost pressure. Existing system has 6-inch pipe in the area but suspect it is sufficient for sprinkler system flows. Are standpipe/hose stations proposed within buildings? Indicate anticipated fire flow capacity for new dead end hydrant on Marvin Alley. Confirm fire protection systems and water system capacity meets NYS Insurance Services Office standards. 2. Where will a backflow preventer be located for this project, inside the individual buildings? Factor in RPZ and all head losses for fire prevention calculations and top floor pressures. S. Add a calculation of available pressure at the top floor shower heads at 6' above finished floor. Pressure is anticipated to be adequate. Needs to be 35-40 psi minimum. 4. Assume individual water services will be metered individually. Provide brief discussion in report on where meters would be located and intended reading system consistent with city standards. Label typical meter requirements on the plans. Stormwater Storm water Pollution Prevention Plan (SWPPP)/storm water modeling 1. We suggest the use of the NYSDEC Stormwater Practice worksheets to aide with stormwater calculations for bio-retention basins with standard default factors. 2. Bio-retention areas are called various labels including bio-infiltration. There is no real infiltration proposed on this site although did not see an underdrain for the rain garden in back of lot 14. The soils are a mix of native and imported fill soils with some debris in zAaL-vo"u\Ioz\1mz17Aoz'/c7z'18zs'ogz7'gyD5C4o541*7ux/5*\oo0-15*\999\/y4/*o5\MFirstonnmentur_7_1a_/mch="yst(Io . .� Timothy Wales, P.E, City Engineer >(� - City of Saratoga Springs ^ --� July 19, 2018 1 = Page 3 it (construction demo materials). For consistency it should be called what it is-bio- retention practice. 3. Their cross section of this only shows 12-inches of planting soil and needs to be 15' deep as a minimum. 4. The hydrocad modeling uses 50% void ratio for the bio-retention volume above its underdrain and is overstated. The stone around the underdrain is approx. 40% void ratio while the soil above it (p|antingso]|) 1saround2Q9Gvoidsandshou(d be changed. The extra depth needed might offset this somewhat. Same concern for the rain garden modeling. This rain garden practice should be under-drained. 5. Is there an underdrain proposed for the rain garden near lot 14? There should be to avoid impacting adjacent basement and connected to conveyance system. 6. WQv=899 CF but calculations are a little unclear how this was reduced from 1350 cf. 7. A few inconsistencies in the discussion part as porous pavement was dismissed but the new driveways will utilize them. Include porous pavement in SWPPP as well as NYSDEC worksheets for sizing. These should be sufficient given the small area tributary to them. 8. Page 23, section 3 lists dry swales but do not believe they are proposed. There are vegetated swales. Confirm and remove this reference. 9. In maintenance section state specific practices for site maintenance and list them. Inspections, re-mulching, debris removal, vacuuming porous pavennent,,—etc' 10. Add in statement that upon completion and one year after to perform site inspection with city of Saratoga Springs staff to identify any needed corrective measures and/or maintenance. 11. Modeling for bio-retention practices as pond structures require revisions. Only the underdrain is listed as an outlet yet there are three. The first is the planting soil infiltration which should be routed to the underdrain as primary outlet. The third is the overflow riser 6: above the bottom of the practice also routed to the discharge pipe. Peak elevations are anticipated to be higher than stated due to the permeability limits of the planting soil which is covered when using the NYSDEC calculation sheets. 12. Revise N[}| as required from revised calculations. zAez~vu lt\ozzu8z17Aoz'/C7/-*uzs'ugz7'9yD5o*o54147m\z541ono'154zng915*1*o5uusrstcommentur_7_1x_Iocu,ny St(ID Timothy Wales, P.E., City Engineer fi City of Saratoga Springs 40,1.4 July 19, 2018 Page 4 13. Complete NOI as there are questions un-answered. 14. Provide operations and maintenance manual as a separate appendix in SWPPP. Cost Estimate 1. Costs for miscellaneous demo/fence should be around $3,000 instead of$1,000. 2. Unit price for 8" storm sewer is low and closer to SHIM installed. 3. Striping asphalt onsite will cost more than $75 and closer to $400 to mobilize, do work, provide materials and demobilize. 4. Landscaping installation costs for trees and shrubs seem very low and could be increased by 50%to be more realistic. 5. Apply onsite factor of 0.25 for onsite work and 100%for offsite work to determine letter of credit amount. Plans C-000 1. See general note regarding zoning Board conditions. S-099 1. Confirm if 18' wide conveyance occurred and was properly filed. Revise survey plan if this occurred. See General comments. C-100 1. Indicate means of abandoning existing sanitary sewer. Pipe and manholes should be removed or filled with flowable fill in our opinion. 2. Add installation of construction entrance in note 4 under site preparation and demolition notes. 3. We note all shrubbery and trees along south property line abutting Saratoga Teleworks is proposed to be removed. Is nothing salvageable? We recommend delaying removal of this screening until construction is imminent for 2 unit building 4. Indicate demolition activities must comply with all federal, state and local regulations including OSHA CFR 29. C-102 1. Is there a bridge proposed over Bio-Retention Area #1 (BR 1) represented by a shaded rectangle? Provide labels, details and elevation of deck and bottom members. Assume all of the bridge is above high water level during 100 year storm event at BR 1? ZAL-Vault\ID2\18217AD2-1C71-4823-8927-99D5C4054147\0\1541000-1541999\1541405\DLTirst Comment ltr 7_18_18 Chem,St(ID 1541405).docx ^ Tlrnothy \�a/es P.E., City Engineer � ~ 111 City of Saratoga Springs July 19, 2018 ' �U Page 5 2. Provide symbol for porous pavement driveways on Marvin alley 3. Label rain garden south of 14 and 16 Cherry street properties. 4. Label retaining wall and include top and bottom of wall elevations. Where does 4" gutter drain go through wall system? Beneath footing, through it? Provide sleeve if through wall system and adjust footing design to accommodate if necessary. If beneath consider ductile iron pipe. [-1C8 1. Has there been an assessment of existing conditions for the basement plumbing for No. 16 Cherry Street to know changing sewer plumbing can provide greater than minimum slopes to discharge to new proposed connection? 2. Please verify intended size of water service pipes and revise detail which calls out %-inch services. We recommend mechanical tapping tees over fused saddles to the new HDPE water main. 3. Add retainer glands to dead-end valve on Marvin alley to protect valve from blowing off if extended in future, 4. Are transition fittings proposed able to withstand tendency for HDPE to creep under temperature changes in the ground? Verify with manufacturer. We understand both ends are restrained but it is the joint at the coupling becoming looser that is the concern. C-1O4 1. Reference detail for rigid foam insulation type and thickness and ensure material is rated for underground service. [-1O6 1. Revise water service detail to reflect 1-1/2" copper services proposed and show how HDPE main is tapped with tapping sleeves. Recommend avoiding fused taps. Tapping sleeve will allow more threads engagement for larger services to a six" main. 2. Is valve box to surface proposed or is valve buried as mentioned on sheet C-107? Without access to valve is preferable to avoid pressurizing this dead end. Notate on blow-up. {-208 I. Add construction site entrance 24' minimum width to detail. If one entrance is provided the width must be 24-foot. z:\n/.vault\zcu\1 uz17Aco 1cr/-+m2s-m9z7'99osc4o54147u0\1 o41000-/51z9y9\1 5414osoLos/un Comment 8_18 Cherry St(ID Timothy Wales, P.E., City En 'neer !Et City of Saratoga Springs41)7 July 19, 2018 (' ' ��N Page 6 C-109 1. Recommend upsizing to 3" caliper for the sugar maples (ACS) to avoid "whip" size of 2: caliper and have an older tree perhaps past early stages of survival and stresses. 2. Coordinate street tree locations with the new streetlights. Flag locations and seek city staff approval before planting. C^.1/D I. Specify geo-textile non-woven product for porous pavement. Mirafi 160n is recommended. 2. Specify porous pavement products proposed instead of generic top and base/binder courses. c-ill 1. Bio-retention area detail does not have enough planting soil. NYSDEC details indicate 2.5'4 feet of planting soil mix. Increase 12" layer to 2.5' minimum. Z. Increase size of underdrain to 6" to increase resistance to freezing. 3. Indicate a freeboard elevation of basin to be above 100 year peak elevation to contain runoff within practice. 12-inches of freeboard would be desirable. 4. Specify filter fabric. [-212 1. increase diameter of cast in place concrete collar around 4" pipe to at least 10-I2". If you have any questions, please feel free to contact our office. Sincerely, BARTON & U]GU|0CE, D.P.C. AS\n4eilii "L„.„,r Bradley D. Grant Senior Prject Manager BDG/ 'f z:\az.vuumnzzxoz17Aoz'1c71-4oz3-8gz7-9go»C4o5414rm\1541ono 1s4zs9915^wo50or/nmco"me" u,_7_18_18chen-y St(ID