2016-05-31-CONCOM-min - Laserfiche WebLink

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TOWN OF LEXINGTON, MASSACHUSETTS CONSERVATION COMMISSION MINUTES Monday May 31, 2016 6:30 P.M. Parker Room, Town Office Building 1625 Massachusetts Ave Chair Phil Hamilton opened the meeting at 6:34 pm in the Parker Room of the Town Office Building Commissioners Present: Dick Wolk, Phil Hamilton, Joyce Miller, Duke Bitsko, Alex Dohan, Kevin Beuttell Others Present: Karen Mullins, Conservation Administrator and Casey Hagerty, Conservation Department Assistant 6:34pm Update on Enforcement Order: Bina Farm/John Carroll, 55/31 Allen Street Bill Dailey- Attorney, Rich Kirby- LEC Environmental, Ashley Tyson and Frank Postma- Mr. Kirby explained that they submitted a plan at the previous meeting regarding the stream restoration. He stated that a piezometer was installed and the results were consistent with test pit data. The stream will be fed by ground water and surface water. The stream will then feed the wetland area. David Langseth arrived at 6:39pm Mr. Postma explained that they split the property into four watershed areas. Ms. Tyson went on to explain each watershed area in detail as well as the design points for each area and the BMPs. Ms. Tyson explained to the commission that a pipe will be removed to daylight a stream and a constructed stormwater wetland will be connected to the replicated wetland. There will also be an infiltration trench on the property; the soil samples show that this area will work for infiltration. Ms. Tyson added that an erosion control plan is in place and details were provided for each BMP. Questions and comments from the commission: The commission asked for more clarification regarding the replicated wetland. Mr. Postma explained that stormwater wetland and replicated wetland will essentially be the same. The stormwater wetland would be separated from the replicated wetland by a small grate-like object that will allow water to flow freely between the two areas, but will allow for the stormwater wetland to be cleaned out as needed according to the stormwater management guidelines.