2018-09-04-CONCOM-min - Laserfiche WebLink

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TOWN OF LEXINGTON, MASSACHUSETTS CONSERVATION COMMISSION DRAFT MINUTES Tuesday, September 4, 2018 6:30 P.M. Parker Room, Town Office Building 1625 Massachusetts Ave Chair Phil Hamilton opened the meeting at 6:30 pm in the Parker Room of the Town Office Building. Commissioners Present: Chair—Phil Hamilton, Alex Dohan, Duke Bitsko, Kevin Beuttell, and Ruth Ladd Others present: Karen Mullins, Conservation Administrator and Jennifer Gingras, Administrative Clerk 6:30 pm NEW BUSINESS/PENDING MATTERS • Request for Insignificant Plan Change, Fire Station, 45 Bedford St., DEP 201-1097, BL 1054, Revise plan to remove vehicle wash stormwater runoff connection to wastewater system as required by engineering Presenter: Kevin C. McGarry, Senior Civil Engineer, Fuss & O'Neill, Inc. Mr. McGarry stated that at the August 6, 2018 meeting, he had presented several changes to the Commission, such as a water and oil separator. The Commission asked him to look into installing a separator on the line. They looked into it but found that the separator isn't designed to handle high flows. Because of this, they are now proposing to replace the separator with a catch basin and pump. The trap hood will be replaced with a baffle. The floatable liquids will get trapped on top and water will be forced to flow out into the sediment flow bay and into a retention system. Overall, it will provide an additional level of pre-treatment. Mr. Beuttell asked Mr. McGarry what needs to be done from an O&M standpoint(nothing yet, it will be inspected the same way as a catch basin with a deep pump would be). Mr. Beuttell stated that in his opinion, as long as it's clarified to when it's inspected and cleaned out, it's a reasonable change. Mr. Hamilton stated that they can state that in the conditions.