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HomeMy WebLinkAboutSP-22-013 - Supplemental - 0000 Stonehedge Drive (8)TITLE SHEETC-1PROJECTLOCATIONGENERALLOCATION© Copyright 2022 Dubois & King Inc.PROFESSIONAL SEALENGINEERING · PLANNING ·MANAGEMENT · DEVELOPMENT6 GREEN TREE DRIVESO. BURLINGTON, VT 05403TEL: (802) 878-7661FAX: (866) 783-7101www.dubois-king.comBRANDON, VTRANDOLPH, VTSPRINGFIELD, VTBEDFORD, NHLACONIA, NHSOUTHBURLINGTON,VERMONTSHEET OF 7NOT FORCONSTRUCTIONPRELIMINARYPLANSSHEET NUMBER425766MAR. 2022PROJ. ENG.DRAWN BYCHECKED BYD&K ARCHIVE #D&K PROJECT #DATELDCLDCSHEET TITLESTONEHEDGEDRAINAGE SWALEBEGgneignreenialpgninntnemeganampdeveolemtn1 256254 256257258 259 260 260261 2 6 2262 264265265265265266266267267268269269270270271WETLAND BBUILDINGBUILDING© Copyright 2022 Dubois & King Inc.PROFESSIONAL SEALENGINEERING · PLANNING ·MANAGEMENT · DEVELOPMENT6 GREEN TREE DRIVESO. BURLINGTON, VT 05403TEL: (802) 878-7661FAX: (866) 783-7101www.dubois-king.comBRANDON, VTRANDOLPH, VTSPRINGFIELD, VTBEDFORD, NHLACONIA, NHSOUTHBURLINGTON,VERMONTSHEET OF 7NOT FORCONSTRUCTIONPRELIMINARYPLANSSHEET NUMBER425766MAR. 2022PROJ. ENG.DRAWN BYCHECKED BYD&K ARCHIVE #D&K PROJECT #DATELDCLDCSHEET TITLESTONEHEDGEDRAINAGE SWALEBEGSITE PLANC-33 DETAILSC-4©Copyright2022Dubois&KingInc.PROFESSIONALSEALENGINEERING•PLANNING•MANAGEMENT•DEVELOPMENT6GREENTREEDRIVESO.BURLINGTON,VT05403TEL:(802)878-7661FAX:(866)783-7101www.dubois-king.comBRANDON,VTRANDOLPH,VTSPRINGFIELD,VTBEDFORD,NHLACONIA,NHSOUTHBURLINGTON,VERMONTSHEETOF7NOTFORCONSTRUCTIONPRELIMINARYPLANSSHEETNUMBER425766MAR.2022PROJ.ENG.DRAWNBYCHECKEDBYD&KARCHIVE#D&KPROJECT#DATELDCLDCSHEETTITLESTONEHEDGEDRAINAGESWALEBEG4 WETLAND BBUILDINGBUILDING© Copyright 2022 Dubois & King Inc.PROFESSIONAL SEALENGINEERING · PLANNING ·MANAGEMENT · DEVELOPMENT6 GREEN TREE DRIVESO. BURLINGTON, VT 05403TEL: (802) 878-7661FAX: (866) 783-7101www.dubois-king.comBRANDON, VTRANDOLPH, VTSPRINGFIELD, VTBEDFORD, NHLACONIA, NHSOUTHBURLINGTON,VERMONTSHEET OF 7NOT FORCONSTRUCTIONPRELIMINARYPLANSSHEET NUMBER425766MAR. 2022PROJ. ENG.DRAWN BYCHECKED BYD&K ARCHIVE #D&K PROJECT #DATELDCLDCSHEET TITLESTONEHEDGEDRAINAGE SWALEBEGEROSIONCONTROL PLANC-5 256256254 2 5 4255256 256257257258 259 259260 260260 261 261 2 6 2262265265265266267268269270271 BUILDINGBUILDINGBUILDINGBUILDINGWE©Copyright2022Dubois&KingInc.PROFESSIONALSEALENGINEERING•PLANNING•MANAGEMENT•DEVELOPMENT6GREENTREEDRIVESO.BURLINGTON,VT05403TEL:(802)878-7661FAX:(866)783-7101www.dubois-king.comBRANDON,VTRANDOLPH,VTSPRINGFIELD,VTBEDFORD,NHLACONIA,NHSOUTHBURLINGTON,VERMONTSHEETOF7NOTFORCONSTRUCTIONPRELIMINARYPLANSSHEETNUMBER425766MAR.2022PROJ.ENG.DRAWNBYCHECKEDBYD&KARCHIVE#D&KPROJECT#DATELDCLDCSHEETTITLESTONEHEDGEDRAINAGESWALEBEG••WETLANDIMPACTPLANW-16 Memo To: South Burlington Development Review Board From: Christine Gingras, Public Works Project Manager CC: Marla Keene, Development Review Planner Date: March 8, 2022 Re: Stonehedge South Area Association Site Plan Application Stonehedge South Area Association proposes to redevelop a 321 LF stormwater swale to connect stormwater infrastructure in the neighborhood with a stormwater pond in Szymanski Park. When the adjacent condominiums were originally constructed, a drainage swale was installed between the K and L clusters. Since then, sediment deposition and growth of a thick root mat of giant reed have clogged the historic channel. Flow out of the neighborhood is currently impeded, resulting in flooding and safety (ice related) issues for residents in the L cluster. The City is proposing to restore positive drainage within the swale by performing maintenance to clear out accumulated material. As vegetation has grown up within this swale area, the City is proposing to rework the swale around mature trees. The proposed work would allow the swale to drain 6.9 acres of impervious surface from a total 34.9 acre drainage area located to the north of the proposed swale. Straddling two parcels, 78% of the project is on Stonehedge South Area Association property. The other 22% of the project is on the Szymanski Park parcel, owned by the City of South Burlington. The proposed project would have no impact on current uses, buildings, or impervious areas. Construction activities (project wide) will have the following impacts on class II wetlands: 8,115 SF of permanent ("other," non-fill) impact to wetland, 4968 SF of temporary impact to wetland, 440 SF of permanent impact to buffer (excavation/non-fill) and 1453 SF of temporary impact to buffer. On the Stonehedge parcel, the proposed project will permanently impact 6,330 SF of existing class II wetland and 343 SF of associated buffer. Construction will include excavation of the ditch in wetland, a temporary construction stabilization pad in the buffer, and tracked equipment access from Stonehedge Drive and turn-around space in the wetland and buffer. Required excavation and removal of approximately 253 yards of fill on the Stonehedge parcel is estimated. This material will be hauled offsite. Impacts to wetland and buffer are required in order to restore the historic flow pattern, allowing stormwater from the culverts outleting on the south side of Stonehedge Drive to drain to the stormwater treatment pond below. Avoidance of wetland impact to construct the swale is not feasible, since the problem is localized to the area between the culvert outlets and stormwater pond below. Alignment of the proposed swale was set to limit impact on existing trees and plants to the greatest extent possible. As avoidance could not be achieved for the project, the minimization criteria was utilized instead. The proposed swale is the minimum size necessary to restore positive drainage, with an average cross-sectional depth of 1 foot. This will enable positive drainage without having a major impact on the subsurface hydrology of the site. The hydrology of the wetland is primarily associated with landscape-scale groundwater discharge from the hill above. Restoration of the wetland will be accomplished by the planting of a wetland seed mix over the disturbed area, and the swale is expected to return to a functioning wetland as vegetation establishes. The State of Vermont Department of Environmental Conservation and Army Core of Engineers have both issued permits for this project. We are submitting this project to the South Burlington DRB for review as a site plan application due to the proposed class II wetland impacts and the amount of fill that will be removed and relocated on site. Included with this application, please find final project plans, a copy of the ACOE wetland permit, VT ANR wetland permit, 1983 Site and Utilities Plan for Stonehedge Condos Cluster L, 2018 Record Drawings for the stormwater treatment pond in Szymanski Park, and Stonehedge abutters list. If you have any questions, please contact me at (802) 658–7961 x6111 or cgingras@southburlingtonvt.gov. VERMONT AGENCY OF NATURAL RESOURCES DEPARTMENT OF ENVIRONMENTAL CONSERVATION INDIVIDUAL WETLAND PERMIT MAJOR AMENDMENT In the matter of: City of South Burlington, c/o Tom DiPietro 104 Landfill Road South Burlington, VT 05403 Stonehedge Drive, South Burlington File #: 2007-469.04 DEC ID #: EJ14-0071 Date of Amendment: November 22, 2021 Decision: Amended The Vermont Agency of Natural Resources (Agency) received a request dated June 17, 2021 from City of South Burlington, c/o Tom DiPietro (permittee) seeking an amendment to an Individual Wetland Permit for a project involving activities in a wetland and associated buffer zone located in South Burlington, Vermont. This amendment is for the construction of a stormwater swale in association with an existing detention basin permitted under 2007-469.02, with additional impacts to 13,083 square feet of wetland and 1,497 square feet of buffer zone. Total impacts for the project are 31,579 square feet of wetland and 35,892 square feet of buffer zone. The Permittee will purchase mitigation credits for the Vermont in-lieu fee program, administered by Ducks Unlimited, Inc. for Vermont, as compensation for unavoidable impacts which would result from Project execution. The credit amounts are to be calculated based on 30,949 square feet of wetland impacts and are to be paid prior to construction commencement. DocuSign Envelope ID: 67B4B7F5-A3A9-416D-AEE8-EF54FE570BA9 2 of 2 City of South Burlington, c/o Tom DiPietro 2007-469.04 The Agency of Natural Resources finds that the proposed amendment will not result in an undue adverse effect to any of the functions provided by the Class Two wetland or the adjacent 50-foot buffer zone located at Stonehedge Drive, South Burlington, Vermont. Other than the revisions described in this amendment, all other aspects of this project, such as the expiration date or reporting requirements, shall be carried out consistent with the original proposal and conditions listed in Vermont Wetlands Individual Permit 2007-469.04. Peter Walke, Commissioner Department of Environmental Conservation by: ________________________________ Laura Lapierre, Program Manager Wetlands Program Watershed Management Division Dated at Montpelier, Vermont this twenty-second day of November 2021 PW/LVPL/TH DocuSign Envelope ID: 67B4B7F5-A3A9-416D-AEE8-EF54FE570BA9