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HomeMy WebLinkAbout2012-05-01 Planning Board Supplemental Materials (30) Eggleston Environmental 32 Old Framingham Rd Unit 29 Sudbury MA 01776 tel 508.259.1137 fax 866.820.7840 April 12, 2012 North Andover Planning Board 1600 Osgood Street North Andover, MA 01845 Attn: Judy Tymon, Town Planner RE: Watershed Special Permit Review 358 Dale Street Dear Ms. Tymon and Board Members: I am writing this letter in follow-up to my March 20, 2012 review letter on the above- referenced project. Since that time I have received and reviewed the March 29, 2012 response from ESS, including plan revisions dated March 27, 2012. The revised plan satisfactorily addresses the issues identified in my March 20th letter with respect to the drainage design, and several items can be addressed as conditions of approval. I do note that the limit of work shown on the plan encroaches further into the existing tree line in the Non-Disturbance Zone than may be necessary to accommodate grading. A proposed landscape plan for the property should be provided to the Planning Board, since landscape maintenance can be a source of pollutants within the Watershed Protection District. (Much of the project area is also outside of Conservation Commission jurisdiction). As indicated in my previous comments, the lawn area on the site should be kept to a minimum and native vegetation should be planted to minimize the need for fertilizer and watering. In order to preserve the infiltration capacity of the porous asphalt driveway and provide stormwater management during construction, I also recommend that the sequencing plan developed by the UNH Stormwater Center be utilized. This would entail installing the driveway subbase with a two-inch overfill at the outset of construction, then removing the overfill (and the sediment and fines trapped within it) once the site is stabilized. The subbase should then be inspected for compaction and infiltrative capacity and, if necessary, scarified to the depth required prior to placement of the porous asphalt layer. Once again, I appreciate the opportunity to assist the North Andover Planning Board with the review of this project, and hope that this information is suitable for your needs. Please feel free to contact me if you or the applicants have any questions regarding the issues addressed herein. Sincerely, EGGLESTON ENVIRONMENTAL Lisa D. Eggleston, P.E.