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Home My WebLink AboutSD-22-03 - Supplemental - 1170 1180 Dorset Street (27)1 Marla Keene From:Dave Wheeler Sent:Friday, March 4, 2022 4:16 PM To:Marla Keene Cc:Christine Gingras Subject:RE: SD-22-03_1170 1180 Dorset St - technical review Hi Marla, The Stormwater Section has reviewed the “Park Road Commons” site plan prepared by O’Leary-Burke Civil Associates, PLC, dated 1/20/22. We would like to offer the following comments: 1. The project proposes to create greater than 1 acre of impervious area and disturb greater than 1 acre of land. It will therefore require a stormwater permit and construction permit from the Vermont DEC Stormwater Division. The applicant should acquire these permits before starting construction. 2. As the project proposes to create more than one-half acre or more of impervious surface, the project is subject to the requirements of section 12.03 of the LDRs. 3. In a future application, the applicant should ensure that the following are submitted: a. Type, material, size, elevation data, and specifications for all proposed collection systems, culverts, and treatment practices b. Results of infiltration testing completed using methods identified in the VSMM. c. Brief written description of proposed stormwater treatment and management techniques d. Maintenance plan for treatment practices 4. In the HydroCAD for the WQv storm, it looks like only a small portion of the rain event is infiltrated in the infiltration basin, while the majority discharges through the control structure to a downstream gravel wetland. Could the bottom elevation of the infiltration basin be lowered in order to provide for more storage and infiltrate a larger amount of the water quality storm event? 5. In the HydroCAD file provided, it appears that the 1” outlet orifice is located 2 feet below the top of storage of the gravel wetland – it also appears that the 1” orifice may be located in the outlet structure of the dry pond. The gravel wetland portion of the treatment practice should contain its own low flow orifice in order to allow the WQv to filter through the stone media over 24 hours. The outlet configuration should arranged so that there is a permanent pool of water within the voids of the stone. 6. The applicant should submit a more detailed site plan. The submitted plan does not have enough detail to verify feasibility. Does the western sub-basin also flow to the gravel wetland on the east side of the property? How will runoff from the roofs of unit 13 and 14 be conveyed to the gravel wetland? 7. In a future application, the applicant should submit a downstream analysis for the 25-year storm event in accordance with the City’s Land Development Regulations. Thanks, Dave Cell (802) 734-1102 Notice - Under Vermont’s Public Records Act, all e-mail, e-mail attachments as well as paper copies of documents received or prepared for use in matters concerning City business, concerning a City official or staff, or containing information relating to City business are likely to be regarded as public records which may be inspected by any person upon request, unless otherwise made confidential by law. If you have received this message in error, please notify us immediately by return email. Thank you for your cooperation. 2 From: Marla Keene <mkeene@sburl.com> Sent: Monday, February 28, 2022 7:23 PM To: Terry Francis <tfrancis@sburl.com>; Tom Dipietro <tdipietro@sburl.com>; Dave Wheeler <dwheeler@sburl.com>; Jay Nadeau <jay.nadeau@champlainwater.org>; Adam Cate <acate@sburl.com>; Craig Lambert <clambert@sburl.com> Subject: SD-22-03_1170 1180 Dorset St - technical review Hi everyone, This application will be reviewed by the Board at the March 15 DRB hearing. This project involves construction of 2 private roads teeing into a somewhat hilly public road. We’ve already reviewed the sketch plan, so this should look at least somewhat familiar. Please provide comments by this Friday 3/4. Just a reminder, comments you provide are inserted directly into the staff report for the project, so please frame your response for public consumption. Project Description Preliminary plat application #SD-22-03 of Rivers Edge Building Development, LLC for the 3.6 acre “Park Road Area” phase of a previously approved master plan for a 450-acre Golf Course and 354-unit residential development. The planned unit development consists of consolidating three existing lots for the purpose of constructing fourteen dwelling units in two-family homes on two private roads, 1170 & 1180 Dorset Street. \\192.168.9.13\\apps\USERS\Planning & Zoning\Development Review Board\Applications\2022\SD-22-03_1170 1180 Dorset St_Park Rd Commons_PP_2022-03-15 Thanks, Marla Keene, PE Development Review Planner City of South Burlington 575 Dorset Street South Burlington, VT 05403 (802) 846-4106 www.southburlingtonvt.gov Notice - Under Vermont’s Public Records Act, all e-mail, e-mail attachments as well as paper copies of documents received or prepared for use in matters concerning City business, concerning a City official or staff, or containing information relating to City business are likely to be regarded as public records which may be inspected by any person upon request, unless otherwise made confidential by law. If you have received this message in error, please notify us immediately by return email. Thank you for your cooperation.