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HomeMy WebLinkAbout2013-09-17 Planning Board Supplemental Materials (113) Eggleston Environmental 32 Old Framingham Rd Unit 29 Sudbury MA 01776 tel 508.259.1137 fax 866.820.7840 July 22, 2013 North Andover Planning Board 1600 Osgood Street North Andover, MA 01845 Attn: Judy Tymon, Town Planner RE: Stormwater Review Great Pond Rd, Map 35, Lot 4 (Dehullu) Dear Ms. Tymon and Board Members: Per your request, I have conducted a technical review of the May, 2013 Watershed Special Permit Application packet submitted by Dehullu Homes for the above-referenced project. Included in the materials I received and reviewed were the following:  Watershed Special Permit Application, Map 35, Lot 4, Stephen Dehullu, Petitioner.  Variance and Watershed Special Permit Site Plan (1 sheet), Assessor’s Map 35, Parcel 4, prepared for Applicant Steve Dehullu by William G. Holt, PLS, RS, SE and dated August 12, 2012. My primary focus in this technical review is on the overall stormwater management approach and design concepts used in the project, as well as its compliance with the Town of North Andover’s zoning requirements for Watershed Protection Districts, the Massachusetts Department of Environmental Protection (DEP) Stormwater Management Standards and Regulations, and the North Andover Wetlands Bylaw. It is my understanding that a Notice of Intent (NOI) application for the project has been or will be filed concurrently with the Conservation Commission, and that an application for a variance has been filed with the Zoning Board of Appeals. My review is aimed at assisting all three town boards in their respective reviews of the project. The proposed project entails the construction of a single family home on an undeveloped lot on the north side of Great Pond Road, portions of which are in the Watershed Protection District as well as within the buffer zone of Lake Cochichewick and a locally jurisdictional wetland. The project is entirely within the Zone A for the Lake Cochichewick public water supply, defined by the Massachusetts Drinking Water Regulations (310 CMR 22.02) as including the land area within a 400 foot lateral distance from the upper boundary of the bank of a Class A surface water source. The lot is presently wooded and undeveloped. Drainage from the property is in a southwesterly direction, toward the isolated vegetated wetland and Lake Cochichewick. Dehullu, Map 35 Lot 4, Stormwater Review 2 July 22, 2013 The proposed project entails construction of a single family home with an attached garage and deck, driveway, utilities and lawn, all of which is shown on the plan as being within the Non-Disturbance Zone of the Watershed Protection District. A portion of the lawn and driveway are also shown on the plan as being within the 100-ft Conservation Zone. My comments on the proposed plan are outlined below: 1. According to the plan, the subject property was created prior to October 24, 1994, therefore the provisions in the Zoning Bylaw related to the Conservation Zone do not apply. 2. The boundary of the Non-Disturbance Zone should include the 100-ft setback from the locally jurisdictional wetland. 3. The project calls for construction of a new permanent structure within the Non- Disturbance Zone which, according to Section 4.136(4)(C) of the Zoning Bylaw, is an allowable use only by Special Permit and only after a variance has been granted by the Zoning Board of Appeals. In an apparent incongruity, Section 4.136(4)(f) of the Bylaw calls for any special permit for a new permanent structure to require that such a structure be constructed outside the Non- Disturbance Buffer Zone. 4. The project also entails a change in topography or grade and vegetation removal within the Non-Disturbance Zone; both of these activities are allowable only by Special Permit. 5. Per the Special Permit Requirements of the Watershed Protection District, a written certification by a Professional Engineer or qualified hydrologist or hydrogeologist is needed, stating that there will not be any significant degradation of the quality or quantity of water in or entering Lake Cochichewick. 6. The application also requires proof that there is no reasonable alternative outside of the Non-Disturbance Zone for the proposed activities, this was not included in the application materials I received. 7. The project proposes to use infiltration to manage stormwater runoff from the project, however it is not clear whether the soils on site are suitable for infiltration as no soils data was included with the application. 8. Design details are needed for the proposed stormwater management structures and erosion controls. The plan refers to a detail on Sheet 3 but only Sheet 1 of 1 was filed. 9. It is not clear from the proposed grading that the driveway will drain to the infiltraton trench. Dehullu, Map 35 Lot 4, Stormwater Review 3 July 22, 2013 10. The proposed utility lines should be run under the driveway to the maximum extent possible in order to minimize the area of vegetation clearing, particularly in the area closest to the lake. 11. The plan calls for the use of native vegetation where possible. As with other projects in the Watershed Protection District the Planning Board may want to request a Landscape Plan. 12. Both the limits of approved clearing and the restriction on lawn care products should be permanently recorded on the deed to the property. The total impervious area allowed within the Non-Disturbance Zone should also be permanently restricted. 13. Architectural plans for the proposed house were not included in the application packet. It should be noted that runoff from metal roofs (or roofing elements) cannot be infiltrated in a Zone A. 14. Ongoing maintenance of the proposed stormwater management structures should be addressed. 15. A Construction Sequence aimed at minimizing the total area and duration of soil disturbance should be provided. I appreciate the opportunity to assist the North Andover Planning Board, Conservation Commission, and Zoning Board of Appeals 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. C: Jennifer Hughes, Conservation Coordinator