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engineering comments THE 1Ihan North Country Office 375 Bay Road,Queensbury, NY 12804 P: (518)812-0513 F: (518)812-2205 COMPANIES www.chazencompanies.com Prrod t0 bc E'1)lvI: -'e l)lv;J d Engineers Hudson Valley Office (845)454-3980 Land Surveyors Capital District Office (518)273-0055 Planners Environmental Professionals Landscape Architects --� E'MA1 ED f February 05,2016 Mr. Craig Brown Zoning Administrator and Code Compliance Officer Town of Queensbury 742 Bay Road Queensbury, New York 12804 Delivered via email only:CraigB@queensbury.net Re: Jay Salmon—Cameron's Deli Town of Queensbury, Warren County, New York Chazen Project#91600.10 Queensbury Ref#SP60-2016 Dear Mr. Brown: The Chazen Companies (Chazen) has received a submission package from your office for the above referenced project. The applicant intends to construct a delicatessen on a 1.35 acre parcel. Submitted information includes the following: • Site Plans and Details prepared by Nace Engineering, PC,January 15,2016; • Stormwater Pollution Prevention Plan prepared by Nace Engineering, PC,dated January 2016; • Architecture Plans by JFM Architect,dated January 14, 2016; • Site Plan Review Application and Project Narrative; e, • Warren County Deed information, and; • Street lamp information; Your office has requested that we limit our review to the design of stormwater system as it relates to compliance to local, state or relevant codes and regulations. Based upon our review, Chazen offers the following comments for the Town's consideration: Stormwater Management& Erosion and Sediment Control: 1. The project proposes to disturb over 1 acre of land and requires the preparation of a Stormwater Pollution Prevention Plan (SWPPP) in accordance with GP-0-15-002 that includes erosion and sediment controls as well as post construction stormwater management practices. A Stormwater Pollution Prevention Plan (SWPPP) has been provided. Comments relating to the Stormwater Management Report and SWPPP are offered below. Chazen Engineering,Land Surveying&Landscape Architecture Co.,D.P.C. Chazen Environmental Services,Inc. The Chazen Companies, Inc. Town of Queensbury Jay Salmon—Cameron's Deli February 05,2016 Page 2 2. It does not appear that an NOI was provided with the SWPPP; the Applicant shall provide a completed NOI with the next submission. 3. It does not appear that the contractors/subcontractors certification statement is included in the SWPPP. Part III.A.6 of the General Permit describes the contractor/subcontractor certification requirements,which the Applicant shall include in the SWPPP. 4. The Stormwater Control Facility Easement and Maintenance Agreement appear to reference the wrong facility owner(Concord Pools);the Applicant to revise. 5. The Applicant shall revise bullet 2 of the Stormwater Control Facility Easement and Maintenance Agreement to include the subsurface infiltration beds. 6. It does not appear that all of the Required SWPPP Contents as detailed in Part 111.13 of the General Permit are provided in the SWPPP. For instance,the required contents described in Part III.B.2.c(i), (iii), (iv), and III.B.2.f do not appear to be provided. These sections refer to the pre- development model and results, which do not appear to be provided and an operations and maintenance plan that includes inspection and maintenance schedules and actions to ensure continuous and effective operation of each post-construction stormwater management practices. 7. The subsurface infiltration bed detail does not appear to depict an observation well or, in general, a means of inspecting and/or maintaining the facilities. The Applicant shall include the manufacturer's maintenance and inspection procedures in the SWPPP and in the subsurface infiltration bed detail. 8. Section 6.3.6 of the NYS SMDM states that "Infiltration practices shall never serve as a sediment control device during site construction phase." The erosion plan (SP-5) depicts temporary sediment basins within infiltration areas 1,2, and 3P. Per Section 6.3.6,the Applicant shall revise the design so sediment control practices are not located within infiltration practices. 9. The Developed Conditions HydroCAD model does not provide distinct inflow value depths, which indicates that the time span of 0-20 hours may not be sufficient. Although this may not affect the results the Applicant shall revise the time span such that the full effects of each storm are realized. 10. Section 6.3.3 of the NYS SMDM states that if the infiltration rate for the underlying soils is greater than 5.00 inches per hour, 100% of the WQv shall be pre-treated prior to entry into an infiltration facility. It does not appear that WQv calculations and pre-treatment calculations were provided in the SWPPP. It is difficult to discern from the site plan where the pre-treatment facilities/features are located.The Applicant shall provide WQv calculations per the NYS SMDM. The Applicant shall revise the design to provide 100%WQv pre-treatment per the NYS SMDM. 11. The proposed grading at the northern entrance of the site on Dix Avenue (N.Y.S. Route 32) slopes generally towards Dix Avenue and as such stormwater may sheet flow onto Dix Avenue. Since Dix Avenue/NYS Route 32 is a NYSDOT road, a highway work permit will be required to construct the entrance. Typically NYSDOT requires that stormwater runoff generated from the R:\9\91600-91699\91600.00-Town of Queensbury\91600.10-SP60-2016-Jay Salmon\ENG\REVIEW\91600.10-lay Salmon_2016-02-05_11.docx Town of Queensbury Jay Salmon—Cameron's Deli February 05,2016 Page 3 site be managed on site, and not be allowed to drain to the road. As such, it is requested that the Applicant coordinate with NYSDOT and confirm the final grading at this location. 12. It does not appear that the SWPPP includes information and determinations regarding endangered or threatened species as well as archeological sensitive areas. It appears that the EAF states the proposed action is located in an archeological sensitive area. The Applicant shall provide the town with any documentation regarding the above determinations and incorporate the same into the SWPPP pursuant to sections Part I.F.4 and I.F.8 of the SPDES General Permit. 13. The Applicant shall depict the stabilized construction entrance on the erosion and sediment control plan; it appears that only a callout is depicted on the plans. 14. Section 6.3.1 of the NYS SMDM states that, "Infiltration practices cannot be placed in locations that cause water problems to downgradient properties. Infiltration trenches and basins shall be setback 25 feet downgradient from structures and septic systems. Dry wells shall be separated a minimum of 10 feet from structures."The infiltration trench located at the southwest corner of the site is within 12 feet of the septic system. The subsurface infiltration beds near the garage are located within 15 feet of the building.The Applicant shall revise the design to conform to the separation requirements of the NYS SMDM. In the event the Planning Board or Town staff have any questions or require additional information, please do not hesitate to contact me at(518)824-1926. Sincerely, —ws Sean M. Doty, P.E., LEED AP,CMS4S Principal Manager, Municipal Engineering Services cc: Sunny Sweet,Town Planning Office Administrator(via email) Laura Moore,Town Land Use Planner(via e-mail) File R:\9\91600-91699\91600.00-Town of Queensbury 91600.10-SP60-2016-Jay Salmon\ENG\REVIEW\91600.10-lay Salmon_2016-02-05_L1.docx