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MINUTES LEXINGTON CONSERVATION COMMISSION 5/9/00 PAGE 2 representative assured the DiLunas that all gas lines are located by Dig Safe before construction begins, that the project work is only in the median of the highways, and therefore they will not be impacted. It was moved, seconded and voted to close the hearing. The wetlands line delineated on the plans was not officially accepted. HEARING. 53 Ledeelawn Avenue. R. Heinwartner&A. Newmark, Addition 8.20 pm 201-467 Present: Amy Newmark and Robert Heingartner, applicants; John Noonan, representative from Noonan& McDowell; and Howard Van Vleck, architect. Mr. Heingartner said they need additional space for their family and home business. They have tried to minimize any intrusion into the brook area and they use only organic materials on their yard. This project has been approved by the Board of Appeals. The project is detailed in the NOI submitted for the project. Mr. Van Vleck distributed basement and first floor plans for the residence. John Noonan presented the plans. The proposed addition is located partially on an existing driveway and partially on existing lawn area within a stone path. Approximately 800 s.f. of Riverfront area will be altered, 200 s.f. of that area is new impervious cover. The entire lot is north of and within the inner riparian zone of the North Lexington Brook. The runoff that I currently drains from the driveway toward the brook will now be directed to a drywell. Mr. Noonan said that they will move the hay bale line closer to the construction area and further from the bank. There are no erosion problems on the property now The existing house is 36.7 feet from the wetlands; the proposed addition is 37.8 feet from the wetlands at the closest point. Therefore the degree of nonconformance has not been increased. The rate of runoff from the area will be decreased because the stormwater drainage system has been designed to mitigate not only the runoff from the new impervious surface, but also from the back half of the existing house. The_Commission isconcemed that_the area is entirely within the inner riparian zone. The applicant said the screen of trees at the top of the slope in the back yard will stay There will be access to the drainage facility if maintenance is ever required. The bottom of the drainage structure is at elevation 200 and the brook is at elevation 196. (Bebe Fallick arrived at 8 45 p.m.) Mrs. Miller read the Engineering report from Tom Hayes,the Commission's consultant, which stated that a soil test and percolation test in the general area of the drywells should be requested to determine seasonal high groundwater elevation and percolation rate of the soils. Letters from the neighbors in support of the project were read and will be kept on file. Mrs. Miller explained that while they may have personal feelings about projects,the Commissioners must make their decisions based on the State Wetland Act and the Town Wetlands By-Law only