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Home My WebLink About20181099 Ballston Ave Townhouse project B&L comments 6-14-19 arton ogui__e_ June 14, 2019 Karl Donohue-Administrative assistant-Engineering City of Saratoga Springs 474 Broadway Saratoga Springs, New York 12866 Re: 96-110 Ballston Avenue Townhouse p 'ect Engineering Review File: 539.047.001 Dear Ms. Donahue • Barton & Loguidice, D.P.C. (B&L) has completed a review of the following reports and information for the Ballston Avenue Townhouse pject located at 96-116 Ballston Avenue as prepared by : Environmental Design Partnership, LLP (EDP): • Application for Sfte Plan Review with Application Checklists; • Full Environmental Assessment Form (FEAF), dated 11-16-2018, as prepared by Environmental Design Partnership, LLP (EDP); • Cost Estimate for Letter of Credit, dated November 2018; • Engineering General Engineers Narrative as prepared by EDP; • Stormwater Pollution Prevention Plan (SWPPP) dated November 2018; w Plan Set (11 Sheets) dated November 5,2019; • Site Plan Checklist; • Stormwater Management Narrative dated November 2018; • City of Saratoga Springs Water Agreement and Application, dated November 19, 2018; • City of Saratoga Springs Complete Streets Application, dated November 19, 2018. This review was 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. The cxper�o�n`�i��V�.~�JL. mAirline Drive^Suite 200^Albany,New York(zzo5chi Telephone:518-218-1801 •Facsimile:518-218-1805•www,BartonandLoguidice.com The power to sc Kari Donohue-Administrative AsCity of Saratoga Springs June 14 2019 Page 2 of 5 General and FEAF 1. Existing utilities are close by and able to be connected to. Confirm conditions at existing manhole, bench and steps to verify not in conflict with new incoming pipe from project 2. Add NYSDEC stormwater permit to question 2 of SEAF. 3. Fill in answers for D.1ivforsurface area of temporary impoundment; 4. Provide answer for question D.2.f.i to account for fuel combustion during construction; 5. Provide answer for question D.2 Provide answer for question D.2.f.i to account for fuel combustion during construction; 6. . Provide more complete answer for question D.2.n.i regarding lighting 7. Some unit costs in the cost estimate seem quite low. Examples are site clearing for $5,000 total, temporary construction entrance, topsoil and seeding and concrete sidewalk at $5 per square foot. Please clarify or revise. 8. In complete Streets checklist confirm if CDTA has been contacted for input to public transportation and facilities offered; 9. Confirm trucks can maneuver on proposed paved road; Water and Sanitary Sewer I. We request confirmation that the new fire sprinkler systems can get the required fire flow from the system per NFPA standards. Discuss internal plumbing connections to existing building briefly and show fire flow computations in Engineer's Report. Have hydrant flow tests taken place? 2. Where will a RPZ backflow preventer be located for this prject, inside each building? Factor in RPZ and all head losses for fire prevention calculations. 3. Engineers report discusses 1,000 GPM required by fire code for single family homes without a sprinkler system but does no 4. Engineers narrative discusses 8-inch sanitary and 3 manholes dedication to city but also discusses all site utilities would be private. Is a HOA proposed? Please revise and clarify. 5. Open existing sanitary sewer manhole and assess need to move internal steps if in close proximity to new pipe from the project. Kari g City of Saratoga Springs June 14 2019 Page 3 of 5 Stormwater Storm water Po//ution Prevention Plan (SWPPP) I. Sign-off on MS4 Acknowledgement form has not been signed yet. Please clarify. 2. Has sign-off letter from NYSSFIPO been received yet?This should be included in final SWPPP when received; 3. Include soil test pit data and infiltration test information including location map and discussion of assumed factor of safety for infiltration rate. What depth were infiltration tests done? Additional infiltration tests and test pits closer to the alley are required to confirm available infiltration rates and confirm groundwater conditions at these lowest site elevations. See plan sheet 3 comments. 4. Time of concentration values for SC 25, 85 and 95 seem very high at 230 minutes. Please revise and clarify. Plans 1. The plan set should include a site layout plan that provides locations and dimensions of planning data of front, side and rear setbacks, pavement centerline radius, curb radius, sidewalk locations and related data in our opinion. Where are park benches, pedestrian level lighting, all signage, bike racks and bus shelter discussed in complete streets document proposed? Did not see any on the plans, Sheet 3 of 11-Existings Conditions and Removals 1. Add site area in acres under square foot value since all other documents indicate acres for consistency. 2. Indicate depth and location of infiltration tests performed. We recommend additional infiltration tests closer to the rear property line by the alley at both ends be required since infiltration trenches and basin are proposed in that area to ensure soil perviousness that those practices depend on. Sheet4 of 11 Grading and Drainage 1. Label all stormwater practices proposed including limits of porous pavement, infiltration trenches 2. Show more spot elevations on sidewalk especially near sidewalk adjacent to drainage swales. 3. We recommend 1 or 2 of the four drywells adjacent to the Dorr property east of the site be relocated to one or two of the yard drain locations or near them to avoid ink4.1 Kari Donohue-Administrative Assistant-Engineering City of Saratoga S 'uga June 14 2019 Page 4 of 5 concentrating groundwater recharge near the slope and neighbors property. Infiltrate closer to the source. 4. Add light rip-rap apron at pipe discharge ends receiving infiltration trench's at small overflow basin. S. We recommend a drywell at the low point of the proposed road north of units 13/14 to ensure rapid dewatering during adverse conditions including cold weather/ice. Sheet S «f22Utility Pion 1. Label existing water main size in Ballston Avenue. 2. We recommend looping the water main to one on Finley Avenue since it stops just short of it. We would recommend discussing with city water department to seek their opinion for looping main and location/size of Finley Street water main. 3. Typical utility service detail indicates a 1-inch service. Is this of sufficient capacity for proposed sprinkler systems? Have required fire flow calculations been performed with local system data input to determine size of water lateral that considers the attached nature of the building development, classification and other pertinent factors? Sheet 6nf12Planting Plan 1. Will central infiltration basin be planted with more than grass? Recommend some bank plantings to add interest near sidewalk. Sheet 7 of 11 Eros/on and Sediment Control P/an I. Show construction entrance as 24' wide since single point of access seems to be proposed. 2. Include requirement for temporarily seeding soil stockpiles to limit potential for wind erosion in developed neighborhood. 3. Show all practices outlind in 0O1 including temporary sediment traps. 4. Extend silt fence along all of north east boundary with Dorr property. S. Supplement sequence of construction activity notes to include when porous pavement is allowed to be constructed knowing that stabilization of earthen surfaces with vegetation has concluded. Also add precautionary language for avoidance of equipment loads and other forms of compaction for pavement subgrade. Sheet 9nf12Road Profile and Details I. Suggest additional drywell at road low point. 2. How many porous practice signs are proposed and where? - 4g!_ Kari Donohue-Administrative Assistant-Engineering City of Saratoga Springs June 14 2019 Page 5 of 5 Sheet 11 of 11 Storm water Details I. Include the word washed in front of clean describing stone for infiltration trench and drywell details. 2. Confirm if filter fabric is intended for top and sides of drywells and not bottom of practice which may bind up over time. If you have any questions please contact us. Sincerely yours, BARTON & LOGUIDICE, D.P.C. „, Bradley D. Grant Senior Project Manager BDGitms Cc via e-mail-Kari Donohue