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Home My WebLink AboutSD-21-19 - Supplemental - 0600 Spear Street (24)1 Marla Keene From:Dave Wheeler Sent:Wednesday, July 7, 2021 2:41 PM To:Marla Keene Subject:RE: SD-21-19 600 Spear St Preliminary Plat - technical review Marla, The Stormwater Section has reviewed the “600 Spear Street FJT, LLC – Preliminary Plans” prepared by Trudell Consulting Engineers, dated May 14, 2021. We would like to offer the following comments: 1. On sheet C‐100, Construction Notes for Contractor & Client/Owner, Note 8 Construction Observation: There is disclaimer language that indicates the owner has not retained TCE to complete detailed inspections during construction or to provide exhaustive or continuous project review. Has the owner retained TCE to provide any services during construction? There are a variety of requirements included elsewhere in the plan that call for the engineer to approve test results and inspect installation, such as the liners under the bioretention systems and the bioretention soil testing, among others. 2. Are the rain guardian devices depicted properly on the plans? They are shown square grates on the plans, but the detail on sheet C8‐402 shows them protruding from the curb line. The concern is that the rain guardian could take up an additional 3’‐8” x 4’‐1” space within the already limited footprint provided for these bioretention areas. 3. Looking at Sheet C3‐03, there are 8” pipes located either 3’ or 4’ below the surface of the bioretention areas. These pipes appear to be different than the 6” underdrains depicted in the Bioretention Areas detail on sheet C8‐401, however, based on their depth, they appear to land within the bioretention cross‐section. Has this been considered/accounted for? a. Also, on the bioretention area detail: i. What size stone is being proposed within the 12” thick stone layer? ii. Was a peastone layer considered in‐lieu of the filter fabric between the bioretention soil and stone? iii. For the biorentetion soil testing, are you requiring the Morgan Method or the Modified Morgan Method? 4. Has §12.03(E) of the City’s LDRs been considered for this site? a. Please provide information on the impact to downstream infrastructure during the 25‐year storm. b. Please provide information on the ability of the proposed Stormwater Diversion pipe’s capacity to convey the 25‐year storm from the upstream drainage area. c. Please provide information on the ability of all proposed drainage structures to be able to convey the 25‐year storm event on site. 5. Are footing drains proposed for buildings? If so, where will they tie‐in? 6. On Sheet C5‐01, if silt fence is being proposed as the primary sediment control practice, it should follow the Vermont Standards and Specifications for Erosion Prevention & Sediment Control, most recently updated in February of 2020. Part 5, Silt Fence notes that the maximum drainage area for overland flow to a silt fence shall not exceed ¼ acre per 100 feet of fence. Silt fence should also be depicted with j‐hooks at the end to capture sediment. 7. Please provide the HydroCAD file for review. Thank you for the opportunity to comment, Dave 2 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. From: Marla Keene <mkeene@sburl.com> Sent: Friday, June 25, 2021 4:14 PM To: Justin Rabidoux <jrabidoux@sburl.com>; Terry Francis <tfrancis@sburl.com>; Tom Dipietro <tdipietro@sburl.com>; Craig Lambert <clambert@sburl.com>; Jay Nadeau <jay.nadeau@champlainwater.org>; Shawn Burke <sburke@SouthBurlingtonPolice.org> Subject: SD‐21‐19 600 Spear St Preliminary Plat ‐ technical review Hi everyone, This preliminary plat application will be reviewed by the DRB on July 20. Due to the City Hall move, I’ll unfortunately be publishing this staff report early as well, so please provide comments by July 7. Project Description Preliminary plat application #SD‐21‐19 of 600 Spear FJT, LLC for a planned unit development on an existing 8.66 acre lot developed with 7,000 sf storage building and single family home. The planned unit development consists of one 6.68 acre lot containing 32 dwelling units in four‐family buildings, a 1.24 acre lot containing the storage building and existing single family home proposed to be converted to a duplex, and a third lot containing proposed city streets, 600 Spear Street. A separate application for final plat will be submitted if this preliminary plat application is approved, and the minutiae will be finalized at that time. Just a reminder, comments you provide are inserted directly into the staff report for the project, so please frame your response for public consumption. \\192.168.9.13\apps\USERS\Planning & Zoning\Development Review Board\Applications\2021\SD‐21‐19_600 Spear_VonTurkovich_PP_2021‐07‐20 Thanks, Marla Keene, PE Development Review Planner City of South Burlington 575 Dorset Street 3 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.