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MINUTES LEXINGTON CONSERVATION COMMISSION 4/25/00 PAGE 3 In response to questions from the Commission, Mr. James pointed to the test pit detail shown on the plan which indicated that silty soil was found on the lot which might clog the infiltrator system over time. Therefore, this soil will be removed and replaced with one that will work with the system better. The grade around the new house will be raised about 1 '/2 to 2 feet to accommodate an acceptable depth for the installation of the infiltrator system. In response to the Commission's concern regarding the impact of runoff from the lot, Mr. James explained that there is a retaining wall on the right side to protect the neighbor and the left side will to the back of the lot. The roof runoff will be collected in the leaching pit and the rate of runoff reduced because of the collection of runoff from the additional 400 s.f. Snow will be plowed to either side of the driveway The Commission noted that the lawn goes all the way back to the wetland line, and suggested a protective vegetative buffer of at least 25 feet be established. Gregg Moore said with respect to planning for a vegetated border,the vegetation at the base of the stone wall was 50/50 wetland/upland plants. The buffer vegetation would be upland plants. The Commission confirmed there are no objections to the present location or use of the gazebo which will be in the 25-foot buffer planting area. Mr. James confirmed that the driveway width was proposed to accommodate parking a car without blocking the entrance to the garage. Mrs. Miller read the Engineering report which finds the leaching system was designed with acceptable engineering practice and the engineer concurs with the methods and results. Comments from the audience followed. Steve Barbera, neighbor at 28 Columbus Street, stated he gets water in his basement now He would like to be sure that he is not impacted by more water. The abutters were concerned about the pipe, installed by the Town, which is no longer effective in draining the depression. Mrs. Miller assured him that the Engineer's report confirms there will be no increase in flooding due to this project. The Commission will explore restoration of the drainage with DPW Ms. Berges,the seller of the property, said the lot is currently very wet because of the weather, but that it is usually dry and completely dries out in the summer. T+was_moved,_secondedand voted_to_close_the_hearing_ Post Office Fines - Caleb Warner, who will no longer continue as an Associate Member because he is moving out of Lexington, asked who would be taking his place as the Water Department liaison. There should be representation from the Town at the meeting to be held May 2 for the Drumlin Farm project that will be financed with the fines from the postal service. He will try to find someone from the Five Fields area to replace him. He will turn over his files to the Office. Wright Farm Property - Mr. Wolk announced there will be walk of the property on Sunday, April 30, at 10 a.m. L