2017-06-12-CONCOM-min - Laserfiche WebLink

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TOWN OF LEXINGTON, MASSACHUSETTS CONSERVATION COMMISSION MINUTES Monday June 12, 2017 6:30 P.M. Parker Room, Town Office Building 1625 Massachusetts Ave Chair Philip Hamilton opened the meeting at 6:30pm in the Parker Room Commissioners Present: Phil Hamilton, Alex Dohan, Kevin Beuttell, Duke Bitsko, Dick Wolk, David Langseth Others present: Karen Mullins, Conservation Administrator and Casey Hagerty, Conservation Department Assistant 6:30pm Request for Insignificant Plan Change at 60 Hartwell Ave, DEP 201-1005, BL 962 Steve Wiehe, Weston and Sampson Mr. Wiehe explained to the Commission that he has submitted the hydrologic information regarding the gutter system. He stated that the gutters were able to carry about the 25 year storm down to the level spreader. Questions and comments from the Commission: The commission asked whether enlarging the pipes would be able to increase the size of the storm the gutters would be able to handle. Mt. Wiehe explained that you would have to significantly increase the size of the gutters, by up to five feet, to accommodate larger storms. The commission asked for clarification regarding the size of the storm that they level spreader could handle. Mr. Wiehe explained that the level spreader can accommodate up to the 25 year storm, but the gutters cannot carry the 25 year storm to the level spreader. The commission discussed whether they initially approved this gutter design if it could not accommodate even the 25 year storm. Mr. Wiehe stated that the solar panel designer was responsible for adding in these features. The commission stated that their biggest concern is erosion on the site. They have requested that the applicant do a thorough study into what areas of the site will be susceptible to erosion and evaluate what can be done on the site to prevent it. The applicant agreed to this. Motion to approve the insignificant plan change on the conditions that the applicant provide an analysis of the water flow made by Mr. Langseth and seconded by Mr. Beuttell. Vote: 6-0 in favor. Request for Insignificant Plan Change at Concord Ave Sidewalk, DEP 201-930, BL 890