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Home My WebLink AboutSD-21-19 - Supplemental - 0600 Spear Street (25)1 Marla Keene From:Dave Wheeler Sent:Friday, March 25, 2022 9:37 AM To:Tom Dipietro; Marla Keene; Adam Cate Subject:RE: SD-21-19 600 Spear St - technical review Hi Marla, The Stormwater Section has reviewed the 600 Spear Street Narrative provided by Trudell Consulting Engineers, dated May 14, 2021 and most recently updated on 3 18, 2022. We would like to offer the following comments: 1. 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. 2. It is assumed that basements are not being proposed and there are no footing drains for buildings. 3. The Snow Storage callout is generic and utilizes a “typical” notation. The applicant should revise the plans to show all snow storage locations. 4. Confirm if the drainage areas for the stormwater treatment practices are correct. As shown, the drainage areas do not cover the entire stormwater treatment practice. Please update to show actual full drainage area – “permitted” vs. “non-permitted” impervious can be shown with hatching within the drainage area as necessary. 5. The contours on the site are very flat and susceptible to puddling. Consider including spot point elevations at breaks between drainage areas to ensure accurate drainage areas and positive drainage. 6. The very south-east corner of pavement within the project: Provide spot point elevation to ensure that runoff flows to CB or treatment practice and not offsite. Include curbing as needed. 7. In general, confirm there are no utility conflicts. In particular, the crossing of the storm drain, gravity sewer and sewer forcemain adjacent to SMH 2. 8. Sheet C8-401: Top of Mulch Elevations and Underdrain Elevations appear to be incorrect, as they differ from the plan sheets by approximately 90 feet in elevation. 9. Sheet C8-401: Bioretention Area Detail: a. What size stone is being proposed within the 12” thick stone layer? b. Was a peastone layer considered in-lieu of the filter fabric between the bioretention soil and stone? c. For the biorentetion soil testing, are you requiring the Morgan Method or the Modified Morgan Method? 10. Sheet C8-402: This sheet includes details for a Rain Guardian and Filterra system. Are these systems being proposed for this project? 11. LA1-01: There are a number of tree planting proposed right on or adjacent to utilities including: 2 a. 1 ‘NS’ on the inlet pipe to Stormwater Treatment Area 2. b. 2 ‘UA’ and 2 ‘AF’ on the gas line running north-south on the east side of the proposed road, c. A ‘NS’ and a ‘GT’ on the forcemain, as it leaves the pump station and before the first bend. d. It is understood that the site is very tight, but there are some large trees with trunks proposed within 5’- 6’ feet of the buildings. Thank you for the opportunity to comment, 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. From: Tom Dipietro <tdipietro@sburl.com> Sent: Thursday, March 24, 2022 3:45 PM To: Marla Keene <mkeene@sburl.com>; Dave Wheeler <dwheeler@sburl.com>; Adam Cate <acate@sburl.com> Subject: RE: SD-21-19 600 Spear St - technical review Marla, Below are my comments on the proposed 600 Spear St project:  Provide a detail for the RRFB’s at the Spear street crossing so that DPW can confirm that the proposed equipment is compatible with other equipment installed in the City. This work will require a ROW permit from DPW.  The crosswalk at Spear Street shall be illuminated by a street light. Provide fixture details along with photometrics for this ped crossing.  Stormwater treatment areas (including grading) shall be removed from any proposed future City ROW.  The City shall be offered an Irrevocable Offer of Dedication for the proposed new city street. The City may not choose to exercise this Offer until such time that the street connects to future public streets. As presently constituted just within this development, the streets serve more as an internal drive than a city street that exists for the good of the general public.  Based on the plans submitted, it appears as if the applicant’s intent is for the wastewater pump station and force main to remain private. If this infrastructure is to be considered for future public ownership the pump station location will need to be revised to facilitate future connections and maintenance. The force main is currently proposed to run through a solar field, which would be problematic if repairs are necessary. The wastewater force main discharge point is proposed on the east side of the interstate at the end of the City’s ROW for Oakwood Drive. Has the applicant coordinated with the State of Vermont regarding the proposed location of the force main? This proposed manhole on Oakwood Drive is the point at which the City would assume responsibility for this infrastructure. In order to install this manhole the applicant will need to obtain a ROW permit from the DPW.  Evaluate the proposed location of the gravity sewer system. Can it be situated to facilitate future connections within the proposed new City street? 3  Evaluate the layout of the stormwater drainage system that is proposed. Are sufficient storm drains provided to collect and convey stormwater runoff from the proposed City street? A storm drains is located in the middle of an intersection in vehicle tire tracks instead of placed along the curb. There are potentially conflicts with UG lines. Insufficient drainage and excessive puddling would be a reason that the City does not accept this road in the future.  The sidewalks running north – south along the proposed “new city street” shall be extended to the northerly property lines  The water line running north-south along the proposed “new city street” shall be extended to the northerly property line.  All pavement markings on sections of street proposed to be public shall meet the VTrans spec for durable markings, Section 646.07, of the VTrans 2018 Standards.  Provide civil details.  Have the applicant confirm the material and width of all proposed sidewalk/path. It appears that the sidewalks in the proposed new City street are of varying size. Thank you for the opportunity to comment. -Tom Thomas J. DiPietro Jr. Director of Public Works City of South Burlington 104 Landfill Road South Burlington, VT 05403 Phone: (802) 658-7961 x6101 Email: tdipietro@sburl.com Web Site: www.sburlstormwater.com Twitter: @SBPubWorks From: Marla Keene <mkeene@sburl.com> Sent: Wednesday, March 23, 2022 2:29 PM To: Dave Wheeler <dwheeler@sburl.com>; Tom Dipietro <tdipietro@sburl.com>; Adam Cate <acate@sburl.com> Subject: SD-21-19 600 Spear St - technical review Hi Dave, Tom, Adam, I’m sending this out for a limited technical review to just the three of you. This application was originally heard back in July, everyone reviewed it, and then they made pretty major changes but the essential flavor of the development is unchanged. I only received their revised materials last Friday, and unfortunately forgot to send them to you until just now. I’m working on cleaning up the project folder so give me like 30 minutes before you start opening things, but could you provide preliminary comments by Thursday of this week? They’ll be back in for final plat so we can look at fine details then. I have a hard deadline of 11AM Friday for finishing my report since I’ll be heading out for a few days at that time. \\city-adserver\apps\USERS\Planning & Zoning\Development Review Board\Applications\2021\SD-21-19_600 Spear_VonTurkovich_PP_2021-07-20 4 Marla Keene, PE Development Review Planner City of South Burlington 180 Market 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.