2021-09-27-CONCOM-min - Laserfiche WebLink

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Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 8:20 PM Amendment to Order of Conditions: 18 Blueberry Lane ViewPoint Cloud Permit#AOOC-21-9, DEP#201-1199, CNOI-20-29 Applicant/Property Owner: 18 Blueberry Lane, LLC Project: slight modifications to the basement and first floor elevations; increasing the roof area; adding 50 square feet of additional impervious surface associated with planter walls (front facade) and landings (rear facade); and enlarging one of two infiltration systems to accommodate a 25- gallon per minute sump pump discharge. The enlargement of this system will result in the removal of three eastern white pine trees located outside the 100-foot Buffer Zone Documentation Submitted: — Letter Describing Requested Amendments and attachments; From: Richard Kirby, LEC; To: Lexington Conservation Commission; Re: Request for Amended Order of Conditions; Date: 9/7/2021; — Stormwater Analysis; Prepared, stamped and signed by: Frederick W. Russell, PE; Date: 10/23/2020 and revised 9/l/2021; — Site Plan; Prepared, stamped and signed by: Frederick W. Russell, PE; Scale: 1"=30' and as noted not to scale; Date: 10/23/2020 and revised on 9/l/2021; Mr. Rich Kirby, wetlands scientist, and Mr. Fred Russell,project engineer,presented the proposed amendments to the Commission. Questions from the Commission: — How did you calculate the design on the sump pump? — How did the infiltration system expand? Responses from the Representative: — The sump pump calculation is based on a 24-hour period, with the pump running for 24 hours cycling on and off. A hydrograph is provided. — The infiltration system was lengthened and widened slightly. On a motion by Mr. Beuttell and seconded by Mr. Langseth, the Commission voted 6-0 by roll call vote to close the hearing. Record of vote as follows: Kevin Beuttell —Aye Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye