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20190467 Station Lane Apts B&L Comments 6-24-19 anon oguiclice J June 24, 2019 Kari Donohue-Administrative assistant-Engineering City of Saratoga Springs 474 Broadway Saratoga Springs, New York 12866 Re: Station Lane project Engineering Review File: 539.051.001 Dear Ms. Donahue Barton & Loguidice, D.P.C. (B&L) has completed a review of the following reports and information for the Station Lane Apartments prepared by : Lansing Engineering, PC: • Revised Letter Report dated May 9, 2019; • November 1, 2018 Planning Board Minutes; • Stormwater Pollution Prevention Plan (SWPPP) dated May 7, 2019; • Plan Set (17 Sheets) dated May 7, 2019. 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. General 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 1. We note change in residential units proposed from 27 at November 1, 2018 planning Board meeting minutes to 29 units consisting of a twelve unit building, an 11 unit building and a 6 unit building. All units would be 3 story; 2. Please submit copy of NYSDEC wetland permit; 3. It remains to be determined what mitigation will be required for the existing sewage pump station adjacent to the project on Station Lane. Needs include provision of a generator and other improvements related to ability to reliably serve this project and others proposed nearby that would be tributary to this station; p The ex eriencetolisteri. 10 Airline Drive•Suite 200•Albany,New York 12205 The ower to SOV Telephone:518-218-1801•Facsimile:518-218-1805•www.BartonandLoguidice.com p MI Kari Donohue-Administrative Assistant-Engineering City of Saratoga Springs June 24, 2019 Page 2 of 5 4. There was a comment regarding the under-developed proposed Civic space in the middle of the project. Walks, sculpture and 2 park benches are proposed. Confirm City stance on newly proposed features; 5. Confirm trucks can maneuver on proposed paved road. Show Garbage truck movements on plan that confirm ability to turn around without needing a parking space that may not be available.; 6. Are buildings slab on grade with no basement or crawl spaces? Water and Sanitary Sewer 1. 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. Hydrant flow tests are included in the report that indicate over 1600 GPM at West Avenue/Church intersection but no elevation is given at that location. The calculations show a fire demand of 1500 GPM for the 1,800 SF fire-flow calculation area. Please elaborate what zone, presumably in each building, this pertains to. Can the required fire flow demand be furnished through 4-inch water services, pressure reduction by backflow preventer and accounting for all pressure losses? Please add a brief section to the report discussing service sizing, pressure losses and available pressure and capacity at third floor sprinkler heads. 2. Where will a RPZ backflow preventer be located for this project, inside each building? Factor in RPZ and all head losses for fire prevention calculations. 3. How many 1 and 2 bedroom units are proposed? 2.5 residents per unit are used for the demand calculations and sewer flow generation values. Open existing sanitary sewer manhole and assess need to move internal steps if in close proximity to new pipe from the project; 4. How will existing wastewater be conveyed/stored when the three sewer laterals are connected to the existing system? Provide notes on the plans that accommodate existing sewer flows and continuance of service for the train station and other users. Stormwater Storm water Pollution Prevention Plan (SWPPP) 1. Please provide a soil map that delineates the extent of the Deerfield and Wareham soils. Is there any appreciable portion of the site outside of wetlands where infiltration is possible in the Deerfield Loamy Fine Sand? If of significant size it could impact the value of S for RRv calculation. MI Kari Donohue-Administrative Assistant-Engineering City of Saratoga Springs June 24, 2019 Page 3 of 5 2. Add a brief section that describes the ability of the existing culvert size, condition and ability to receive site drainage and not increase drainage concerns downstream. 3. What green infrastructure practices are proposed? Storage and treatment seem to come via commercial non-green practices; 4. Provide calculations matching the treatment system capacities versus peak flow rate to the proposed units to ensure adequate capacity that considers this peak rate. It is our experience that a 1.15-inch storm in Hydrocad does not match the water quality volume. Typically increasing the 90% storm to around 1.7—inches results in a similar volume to WQv and its real peak inflow rate the units must have capacity for. What is the individual capacities for each treatment unit and its associated factor of safety in treating the peak inflow associated with the WQv event? 5. The Station Lane drainage piping proposed is noted to be a flat slope over almost 400' with 4' deep sumps. This is also noted to be turned over to the City for ownership and maintenance. This is an area of concern as discussed earlier. Plans Sheet 1 of 17-Cover Sheet 1. Please clarify the meaning and intent of note 7 under accessible route notes regarding 36-inch clear width. Sheet 2 of 17-Survey 1. The northerly end of the site has a finger of access to McGee Road and two storm sewers are at least partially shown. Where do these pipes start and end and are they conveying the source of stormwater to the culvert on Harbor Lane just east of the project? Label sizes of all pipes; 2. Label size of existing Station Lane storm culvert that will receive runoff from project. . Sheet 3 of 17 Existing Conditions & Demolition Plan 1. Label existing water main size in Station Lane; 2. Label all existing culvert sizes, see above; 3. In the southeast corner of the site there appears to be a wetland upstream of the Station Lane Culvert. Is this a state or federal wetland? Please label accordingly. Sheet 4 of 17-Layout and Materials Plan 1. The proposed guiderail along Station Lane proposed sidewalk is on the ditch side and offers no pedestrian protection from vehicular traffic. The south side of the road has a MI Kari Donohue-Administrative Assistant-Engineering City of Saratoga Springs June 24, 2019 Page 4 of 5 curb and thus protected. Can the guiderail go between the edge of the road and the sidewalk? Sheet 5 of 17-Utilities and Plan 1. Label all roof leaders and indicate size; 2. The proposed storm drainage piping at the proposed bump-out for ons-street parking is approximately 400' long of 18-inch pipe at a 0.00% (flat) grade. This will likely result in sediment build-up of this likely oversized pipe and undue maintenance needs over its life. It appears the constraint is the presence of wetlands and the 100' buffer zone but can likely be overcome by conveying it farther at a positive grade towards the existing culvert, perhaps to the south side or in the buffer zone on the north side. $' deep sumps are noted but concern is within pipelines and lack of cleansing velocity to transport sediments. Please clarify workable options. 3. Where does retaining wall at 11-unit building end at its southerly end. Is it along part of the foundation wall? 4. Show elevations of sanitary sewer laterals at buildings that provide adequate cover. . Sheet 7 of 17- Erosion & Sediment Control Plan 1. Fully encircle sediment trap area and soil stockpile north of 6 unit building. Sheet 8 of 17-Landscaping Plan 1. Suggest additional groundcover or low plantings for parking islands with parking island tree and one where nothing is shown to add color an, texture and interest. If fully mulched these di9fficult to mow areas could be reduced. 2. Suggest additional groundcover or low plantings at civic area and west end of 11 unit building. Sheet 9 of 17-Lighting Plan 1. Show grounding rod on streetlight detail; 2. Suggest moving rear wall building mounted light east towards door or provide another light near door; 3. Suggest a light in the rear of 6 unit building. Sheet 14 of 17-Misc. Site Details (2 of 2) 1. Is rough sawn cedar siding for dumpster enclosure amenable to City of Saratoga Springs. There is no mention of coating/paint and question its longevity even with cedar. 2. Metal Beam guiderail is shown near edge of pavement but without sidewalk, see previous comments on guiderail protection of pedestrians. MI Kari Donohue-Administrative Assistant-Engineering City of Saratoga Springs June 24, 2019 Page 5 of 5 3. Will there be underdrain(s) for the retaining wall? If so show route and inverts on the plans. Sheet 15 and 16 of 17-Stormwater Management Basin Details 1. Label all materials and depths of fill materials under, alongside and over stormwater chambers; 2. It seems the entire chamber is enveloped in an impermeable liner. We assume the term infiltration in the detail referring to "surrounding the subsurface infiltration system is a term not associated with its design intent for this project. Please clarify; 3. Provide sub-base depth and material notes for foundation for treatment units; 4. Provide notes, dimensions and materials of construction for anti-seep collar on the detail. If you have any questions please contact us. Sincerely yours, BARTON & LOGUIDICE, D.P.C. Bradley D. Grant Senior Project Manager BDG/tms Cc via e-mail-Kari Donohue