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Home My WebLink AboutSP-18-57 - Supplemental - 1200 Airport Drive (15)1 Marla Keene From:Gendron, Christopher <Chris.Gendron@stantec.com> Sent:Tuesday, January 8, 2019 9:33 AM To:Dave Wheeler Cc:Larry Lackey (llackey@btv.aero); Marla Keene; Harris, Polly; Leinwohl, Jon Subject:RE: SP-18-57 Runway Expansion - stormwater Hi Dave, In addition to the information I sent out last week below is a summary explaining how the NOTEII Apron is meeting the South Burlington LDRs. The NOTEII Apron, located just North of the Main Terminal, currently drains to an existing infiltration system associated with a Underground Injection Control (UIC) permit. This system is currently gravity fed. Due to updated permit conditions associated with our UIC permits, we’re relocating this runoff to a newer system installed in 2016 that uses pump stations to inject stormwater runoff into the ground. Stormwater Runoff from this area will flow into a trench drain, into a hydrodynamic separator, diverted to a large storage tank and pumped into a system of perforated pipes sized to inject up to the 1 year design storm (2.1”). Larger storm events will overflow a weir and discharge to the north outfall to an unnamed tributary of the Winooski River. If you have any additional questions about this, please don’t hesitate to reach out. Thanks, Christopher Gendron, PE Project Manager, Civil Engineering Direct: 802 497-6402 Cell: 802 917-3117 Chris.Gendron@stantec.com Stantec 55 Green Mountain Drive South Burlington VT 05403-7824 To help protect your privacy, Microsoft Office prevented automatic download of this picture from the Internet.Stantec The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately. From: Gendron, Christopher Sent: Monday, December 24, 2018 11:01 AM To: 'dwheeler@sburl.com' <dwheeler@sburl.com> Cc: Larry Lackey (llackey@btv.aero) <llackey@btv.aero>; Marla Keene <mkeene@sburl.com>; Harris, Polly <Polly.Harris@stantec.com>; Leinwohl, Jon <jon.leinwohl@stantec.com> Subject: RE: SP‐18‐57 Runway Expansion ‐ stormwater Good Morning Dave, Hope all is well, its been a while! We’re still putting the final touches on our Stormwater Permit Amendment that I was planning on sending along but we’re still short a few of the plans required under the new rules. In lieu of that, I’ve provided the specific information requested 2 below. See the attached. Please don’t hesitate to reach out if you have any questions. I’ll be available by phone this week and available for a meeting next week if you would like. Thanks and happy Holidays! Christopher Gendron, PE Project Manager, Civil Engineering Direct: 802 497-6402 Cell: 802 917-3117 Chris.Gendron@stantec.com Stantec 55 Green Mountain Drive South Burlington VT 05403-7824 To help protect your privacy, Microsoft Office prevented automatic download of this picture from the Internet.Stantec The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately. From: Leinwohl, Jon Sent: Friday, December 7, 2018 2:57 PM To: Gendron, Christopher <Chris.Gendron@stantec.com> Cc: Larry Lackey (llackey@btv.aero) <llackey@btv.aero>; Marla Keene <mkeene@sburl.com>; Harris, Polly <Polly.Harris@stantec.com> Subject: FW: SP‐18‐57 Runway Expansion ‐ stormwater Chris, Would you please provide responses to Dave Wheeler’s comments below? As noted in Marla Keen’s email, we can coordinate directly with Dave, but be sure Marla, Larry Lackey, and I are included on correspondence to ensure the records are complete. Thanks, Jon Jon Leinwohl P.E. Associate, Transportation Direct: 802 497-6410 Mobile: 802 324-8626 Fax: 802 864-0165 jon.leinwohl@stantec.com Stantec To help protect your privacy, Microsoft Office prevented automatic download of this picture from the Internet.Stantec The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately. From: Marla Keene <mkeene@sburl.com> Sent: Friday, December 07, 2018 2:47 PM To: Leinwohl, Jon <jon.leinwohl@stantec.com> Subject: SP‐18‐57 Runway Expansion ‐ stormwater Hi Jon, 3 I’ve received a request for more information from Dave Wheeler, our assistant stormwater superintendent on your runway expansion application. Are those two “catch basin” icons on sheet SK‐503 actually runway markings? Please provide the following: ‐ Updated drainage areas for each stormwater treatment practice. ‐ Updated calculations for each stormwater treatment practice indicating sufficient capacity for revised drainage areas. ‐ Confirm all new or redeveloped impervious area is provided with treatment in accordance with the City’s LDRs. ‐ A brief narrative might help as well. If you need to reach out to Dave directly, that’s fine, but please copy me on all correspondence for recordkeeping purposes. Thank you, 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.