2000-09-19-CONCOM-min.pdf - Laserfiche WebLink

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MINUTES LEXINGTON CONSERVATION COMMISSION SEPTEMBER 19, 2000 Commissioners present: Bebe Fallick, Lisa Baci, Duke Bitsko, Philip Hamilton, and Joyce Miller. Absent: Angela Frick and Dick Wolk. Others present: Marilyn Nordby and Linda Gaudet. Chairman Miller called the meeting to order at 7:50 p.m. in Room G-15, Town Office Building. High School Drainage Plan - 201-438 At a previous meeting Dan Vallee stated that the installation of the entire drainage system cannot be completed for two years because of project phasing. He reviewed a temporary drainage plan to mitigate stormwater runoff from the new pavement installed on the Waltham Street side of the parking lot. An orifice on the existing pipe will reduce the speed of stormwater outflow through the pipe. Overflow or backup will be directed to a detention pond which will serve as a temporary storage area. A 10x20 by 6" deep spillway filled with crushed stone between CB 257 and the storage pond is also proposed. The contractor does not plan to install curbing along the access driveways until next spring. The Commission required that the curbing must be installed by April and they approved the proposed temporary solution pending the Town Engineer's approval. The installation of the 11-inch orifice and surface storage area should be completed no later than October 31, 2000 The Commission requested that a plan and a work schedule with specifics be submitted to the Office. It was moved, seconded and voted(Ms. Baci abstained)to approve as a field change the proposed interim stormwater mitigation system as stated above, and to require that the curb along the road south of building A be installed by April 15, 2001 HEARING, 32 LINCOLN STREET J Rhodin,Addition - 201-476 Present: Mac McDowell,Noonan& McDowell, Jeffrey Rhodin, applicant. Others are listed in the file. Mr McDowell presented a plan for the construction of an addition, garage and driveway to an existing home at 32 Lincoln Street. The addition is located 80 feet from the Bordering Vegetated Wetland. The wetlands were flagged on 5/8/00 by LEC and the report is on file. Runoff from the yard and roof will be directed to an infiltration and leaching trench to mitigate an increase in stormwater runoff during all storm events. A test pit was dug to determine the soils information. Mrs. Miller read the engineering report which finds that the design was prepared using standard and accepted engineering practice and concurs with the engineer's methods and conclusions. In response to questions from the Commission Mr. Rhodin said that the wetlands line has not changed much from his previous submittal. The infiltrator trench, constructed in 1993, will