2021-11-22-CONCOM-min - Laserfiche WebLink

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Mr. Richard Kirby, LEC Environmental, and Mr. Michael Novak, project engineer, presented to the Commission. Mr. Novak stated that there is a net reduction of 795 square feet of impervious surface and that no infiltration is being proposed and best management practices (BMP) are available. Questions and Comments from the Commission: Can you confirm where the property boundary is? Trench drains are notorious for becoming clogged over time. Is it possible to make the trench drain slightly lower than the corner of the bluestone pool deck so it becomes obvious to the property owner when it needs to be cleaned out? What kind of grading modifications, if any, need to be done for the addition at the northwest corner of the house? Is the storage volume of the grass depression part of what is needed in order to meet the performance standards, or is it purely to slow down the velocity of the water coming out of the trench drain? Is the applicant willing to continue some of the invasive management and restoration beyond the property line to the north? Make sure the proposed addition is being calculated correctly and according to the performance standards, and that the existing surfaces are being considered as open space in good condition and not taken credit for in the runoff calculations. Responses from the Representative: The driveway and retaining wall extend over the property boundary. Those were present when the property was purchased. Mr. Novak does not think much grading will need to be done at all. He will check on the architectural drawings to confirm if there is an egress proposed. The storage volume of the grass depression will help to slow down the velocity of the water coming out of the trench drain. There is landscape debris and piles present beyond the property line and a row of eastern hemlock that was recently cut. The area beyond this lacks significant vegetation and LEC is not sure how realistic an invasive management plan would be in the long term because it is such an open area. Will double check the calculations and present at the next meeting. On a motion by Mr. Langseth and seconded by Ms. Dohan, the Commission voted 6-0 by roll Record of vote as follows: Kevin Beuttell Aye Alex Dohan Aye Ruth Ladd Aye David Langseth Aye Holly Samuels Aye Phil Hamilton Aye 6