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HomeMy WebLinkAbout20190299 Saratoga Golf and Polo Engineers Response 7-21-19 la The LA GROUP L.41dscwp Arrhitocitkre a Enqintleraril ',,. i e 06 July 31, 2019 49 .g Ms. Susan Barden, AICP 49 1 City Principal Planner City of Saratoga Springs 474 Broadway Saratoga Springs, NY 12866 RE: Saratoga Golf and Polo Club Expansion of Member Facilities Dear Ms. Barden: The LA Group is in receipt of comments from the Chazen Companies, dated July 24, 2019. The following are responses to the comments. Comment 43: The expansion/reclamation of the existing wet pond designated SMP-3 as a P2 variant must comply with the requirements of the SWM design manual(aquatic benches,slopes) water depth, plantings, etc.)Please update the plans and the SWPPP accordingly. The applicant has responded that benches are not required for ponds with less than 4-foot depth. However, the following requirements of the SWM design manual for pocket ponds have not been addressed: a. A document titled "Frequently Asked Questions About Technical Requirements of the SPDES General Permit(GP-02-02)for Storm water Discharges from Construction Activities"issued by DEC in 2004 addresses wet pond depth. The FAQ indicates that the Design Manual requires a minimum 4-6 foot depth for pretreatment and micropools to prevent scouring, and further indicates that the permanent pool does not have a minimum depth requirement but that depths should be no le5s than 3'-4'or the pond will function more like a wetland and should follow wetland design criteria. We note that pretreatment is provided by a bioretention area rather than a forebay„ but it does not appear that the minimum depth requirement for the micropool has been met. The micropool depth and required benches should be provided, or a letter from DEC indicating that the depth and geometry of the pond is acceptable as designed. b. Pocket ponds must interact with groundwater to maintain a permanent pool. Please submit soil testing results that indicate the depth to groundwater within the footprint of the pond and confirm that groundwater is higher than the bottom of the pond. c.A landscaping plan which indicates how aquatic and terrestrial areas will be vegetatively stabilized and established must be provided for all ponds. Aquatic vegetation is essential to the pond design as this is the component Response 43: a. Per discussions with NYSDEC a 3.5deep permanent pool is acceptable. See attached correspondence with DEC. b. The pond currently maintains water at all times and has been confirmed by City of • Saratoga Springs staff. • c. Landscape plan has been revised to include plantings around the aquatic area of the pond. • Sincerely, i i ,1 Brett C. 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I !I, Pi ,:r i .rii 2Ile 10 iE . • . g- l!fv§' f /10 . !g L'15r IN Lt, 12 gi lig, .i..4 !,(c!'--14i B IP 'FIT,i1 sti ' % f f ,b!gY1 2lil !;. 1§ 181 ';-_-== 1 li '-i-W it !,t xli gl Illig ai 15 -', Plf11'-'11S t 10 M; ria 2 * ' 811/2019 Zimbra Zimbrai jenniferimerriman@saratoga-springs.org .„, RE: Stormwater Pond Depth From David J Gasper (DEC) <davidigasper©dec.ny.gov> Wed, Jul 31, 2019 02:16 PM Subject : RE: Stormwater Pond Depth 1 attachment To : Douglas Heller <dheller@thelagroup.com> Doug, Based on the language in FAQ 44 in the "Frequently Asked Questions About Technical Requirements" (2cd to last sentence) and the design criteria/recommendations included in the other states Design Manuals, we feel the proposed 3.5 ft permanent pool pond depth for the proposed Pocket Pond is acceptable. We are in the early stages of a Design Manual update and will plan on clarifying the design criteria to address this issue. Once the Design Manual update is complete, we will also update the FAQ. Let us know if you have any questions. From: Douglas Heller<dheller@thelagroup.com> Sent: Wednesday, July 31, 2019 1:47 PM To: Gasper, David J (DEC) <david.gasper@dec.ny.gov> Subject: Stormwater Pond Depth - - - CliCk 01? 1.411(5:frarl? 0/77a115_, Dave, We have been requested by a IDE to clarify requirements on pond depths for Pocket Ponds. The question is regarding depth of the permanent pool in the basin, not the forebay. We are proposing a Pocket Pond which will have a permanent pool depth of 3.5'. Based on existing site conditions the pond will interact with groundwater and the permanent pool depth will be maintained. The NYSSMDM does not specify a minimum depth, but the FAQ does reference a 3-4' depth. Also reviewing other states requirements (Minnesota, Georgia, Massachusetts, and New Hampshire) for wet ponds a minimum depth of 3' is recommended. The TDE has asked if we can clarify with NYSDEC if a 3.5' permanent pond depth in a Pocket Pond meets the NYSSMDM requirements. Thanks. Douglas Helier, P.E. Associate Principal/Civil Engineer The LA GROUP Landscape Architecture and Engineering,P.C. People. Purpose, Plate. 40 Long Alley Saratoga Springs.NY 12866 518/587-8100,x231 hftps://m.saratoga-springs.org/h/printmessage?id=89668&part=38az=ArnericaiNew_York 1.2 8/1/2019 Zimbra 51g/587-0180 dheller©thejagroup,com http: m..thelagroup.cool Twitter Facebook Linkedin Unknown <text/Mini> 8 KB https://m.saratoga-springs.org/h/printmessage?id=89668&part=3&tz=America/New_York 2/2