2007-09-11-CONCOM-min - Laserfiche WebLink

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MINUTES — LEXINGTON CONSERVATION COMMMISSION September 11, 2007 Commissioners present: Joyce Miller, Stew Kennedy, Dick Wolk, Angela Frick, Phil Hamilton, Duke Bitsko, David Langseth (7:40 pm) Others present: Karen Mullins, Administrator; Adam Bossi, Assistant Administrator; Louise Vinci, Department Clerk Joyce Miller, Chair, opened the meeting at 7:30 p.m. in room G -15, Town Office Building. 7:40 p.m. Continued Hearing: 177 Grove Street, DEP# 201 -705, BL 662; M/L 0087000005 Present for the applicant /homeowner: Steve Eriksen Steve Eriksen presented a brief overview of changes made to the plan since the last time this project was brought before the commission. The revised changes included the omission of foundation drains and adding a waterproof membrane coating to the foundation. Ms. Miller read the independent engineering review from Tutela Engineering Associates into record. Comments from the commission followed: Phil Hamilton asked if houses would have a basement or slab foundation. Mr. Erikson answered that they would have basements. Dick Wolk asked about expanded wetland area proposed in applicant's August 14 document, and would like to know the purpose of the enhancement. Administrator Mullins answered that the enhancement was something that may have come up at a site visit or during a planning board hearing, she was not sure if the proposed enhancement would become a wetland due to the hydrology of the soil and was concerned because the vegetated upland buffer would be destroyed in trying to create the wetland. Stew Kennedy noted the plan showed the grading on driveway from Dewey Road but no grading on driveway from Grove Street. Mr. Eriksen answered that the grade on the Grove Street driveway would not change from present grade. Mr. Kennedy asked what the driveway would be made of and if it would cause an increase in runoff toward the abutting properties. Mr. Eriksen replied the driveway would be repaved but would not cause more runoff because it was already impervious and part of the driveway would be removed. David Langseth inquired if the possibility of installing infiltration systems for foundation drain like the ones installed for roof runoff had been explored. Mr. Eriksen replied that it would make the installation of the infiltration units larger, cumbersome, difficult and expensive so they were decided against. Mr. Langseth asked how the new owners should handle the resulting water issues if the foundation waterproofing should fail. Mr. Eriksen replied that the contractor guaranteed the waterproofing. The contractor would use a membrane on the outside as well as under the foundation footings. Duke Bitsko asked if separate erosion and sediment control plan were submitted. Mr. Page 1 of 5