2021-01-04-CONCOM-min - Laserfiche WebLink

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Alex Dohan—Aye Ruth Ladd—Aye David Langseth—Aye Holly Samuels —Aye Phil Hamilton—Aye 8:21 PM (1:44:55 for LexMedia Recording) ViewPoint Cloud Permit# NOI-20-32, DEP#201-1203 Notice of Intent, 72 Grassland Street Applicant: Venkat Mannem Project: Construct an addition to a single-family dwelling and wooden deck, within the 100-foot buffer zone. Erosion controls and stormwater management are proposed, and wetland and Buffer Zone restoration to improve existing site conditions. Previous Meeting Date: 12/14/2020 Supplemental Documentation: — "StreamStats Report for 72 Grassland Street, Lexington, MA";prepared 12/14/2020 — "Drainage Plan", prepared by Gala Simon Associates, Inc., signed by Alberto M. Gala, P.E Civil No. 36434; dated 11/3/2020 and revised through 12/29/20 — "Engineering Drainage Calculations for 72 Grassland Street",prepared by Gala Simon Associates, Inc., signed by Alberto M. Gala, dated 11/3/2020 and revised through 12/28/20 Mr. Richard Kirby, LEC Environmental and Al Gala, Project Engineer, presented to the Commission the revised plans and stormwater report. Mr. Kirby stated that they added a 5 foot crawl space (elevation 209.94) as opposed to a full foundation, and that a small area will need to be created for the utilities in the basement. He also stated that the top of the peat is being used as the estimated seasonal high groundwater table and that the infiltration system remains unchanged. The size of the infiltration system in the front of the house has increased to incorporate the runoff of the entire existing dwelling, porous pavers will be put in place of the existing driveway, and mitigation efforts have increased rather substantially. Mr. Gala added that all the impervious surfaces are proposed to be infiltrated, and they are trying to keep the drainage system above the groundwater, especially in the rear. Questions from the Commission: — Referring to the retaining wall and replication area, is everything behind or North of the retaining wall or is there some other delineation between the usable lawn and wetland replication? — Neighbors are concerned about flooding. Has there been any update on lowering the elevation? — Where is the wall? Responses from the Applicant: — The replication area comes within a couple feet of the retaining wall. There is a small area of what could be lawn between the wall and the Feno markers.