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HomeMy WebLinkAboutCorrespondence - 107 CAMPION ROAD 7/15/2014 Eggleston Environmental July I5,20l4 � North Andover Planning Board l6O0 Osgood Street North Andover,YvD\ O\045 Attn: <�udQo11�vanco r)�rootorof(�ononzuuiiv[}�vc�opou�ut . , ' � RE: Watershed Special Permit lO? Campion Road � Dear Mr. E3clluvonos and Board Msoubocn: In follow-up in my June 17, 2014 ononnneu1a on the above-referenced project, l have received the June 23, 2014 moapouos letter and the July 9' 2014 revised plan and � calculations submitted by James Fairweather, P.E . of Andover Consultants Inc. Based ou the recent soil b:ato and runoff calculations, Mr. Fairweather has satisfactorily / demonstrated that the three proposed rain gardens would adequately mitigate projected increases in the vn}uzuo or rate of runoff from the site resulting from the proposed development. Per the analysis, roof runoff from the proposed building should be directed onto pervious surfaces or infiltrated via u drip trench oz dry wells; it should not bcpiped directly to the rain garden. As outlined in my previous comments, the Board should consider requiring a covenant on the property (n ouaurm that future property ovvouro maintain the rain gardens and do not regrade or otherwise alter their functionality as stormwater management structures. While Mr. Fainwem1hcc`a response letter ynAgcmb; that the cuiu gardens are solely for the bnuoOt of the subject property, l would argue that they also perform an important function in � pcm/:utiog erosion on dovvugradieut properties and protecting the water quality of Lake � Cocbiohsvvick. ] also recommend that the conditions outlined ionzyprevious couzozcutu � / #6 and #7 be incorporated in any approvals issued for the project. Since the project wiK not be subject to the K5pA Construction (]oopru\ Permit, the Conservation Commission may want to address erosion &s osdicoeo1 control requirements in its (}cdez of Conditions � � as well. Once again, Iappreciate the opportunity to assist the North Andover Planning Board with � the review ufthis project, and hope that this information is suitable for your needs. Please feel free to contact zooif you or the applicants have any questions. Sincerely, EGGLE8T0N ENVIRONMENTAL Lisa D. Eggleston,P.E. C' J�m��rRu»h�o Couoon/a1�on�oon]�uu1m . Hughes, � 32 Old Framingham Rd Unit J9 Sudbury MA 01776 te( 5O8.259.1137 r. June 23, 2014 North Andover Planning Board Town Offices 1600 Osgood Street North Andover, MA 01845 RE: Watershed Special Permit 107 Campion Road Ladies and Gentlemen: We are in receipt of review comments made by your consultant, Ms. Lisa Eggleston, P.E., for the project captioned above, contained in her letter to the North Andover Planning Board dated June 17, 2014. Five copies of the revised plan revision dated June 19, 2014 are attached. The plan was revised in response to some of the review comments as noted below: Comment 1. The entire project site is located within the Watershed Protection District (WPD). It is my understanding that the lot was created prior to Oct. 24, 1994 and is therefore not subject to the "Conservation Zone" requirements of the Watershed Protection District regulations, however this should be confirmed In addition, the Non Disturbance Zone should be shown on the plan as j extending 100 feet from the edge of all wetland resource areas within the watershed district and the Non-Discharge Zone should be shown to include all of the area within 325 feet of the edge of all wetland resource areas within the watershed district. The proposed uses are allowed by Special Permit within these zones, however the construction of a new permanent structure within the Non- Disturbance Zone also requires a variance from the Zoning Board of Appeals. The Special Permit Requirements also call for proof that there is no reasonable alternative outside of the Non- Disturbance and/or Non-Discharge Zones for any proposed discharge, structure or activity to occur. Response: The lot was created in 1985 by a subdivision approved by the North Andover Planning Board on March 26, 1985 and recorded at the Essex North registry of Deeds as Plan No. 9887. The 1.00 foot Non-Disturbance Zone coincides with the 100 foot buffer zone and the notation revised accordingly. The 325 Non-Discharge offset from the wetland extends beyond the property limits;the entire lot is within this zone. The applicant was granted a variance by the North Andover Zoning Board of Appeals on May 13, 2014 for the proposed dwelling in the non-disturb zone under Petition No. 2014-004. Comment 2. The Project Description states that the rain garden areas are proposed to compensate for the filling of the wetland, however no calculations have been submitted to demonstrate this The rain gardens should not only provide sufficient storage to compensate for the filling of the wetland, but also for the increase in impervious surface associated with the development Of the site. Based on the evidence of soil erosion I Observed on the slope downgradient of the site (just upgradient Of the cul-de-sac at the end of Bonny Lane), no increase in overland flow from this site should be allowed. Comment 8. It appears that the proposed project will entail the disturbance of more than one acre of land, hence it is subject to EPA's NPDES Construction General Permit (CGP) and will require filing for coverage under the CGP and the preparation and implementation of a Stormwater Pollution Prevention Plan (SWPPP) prior to construction. The SWPPP should be prepared in conjunction with the site contractor and should include a construction sequence aimed at minimizing the duration of exposure of unstabilized soils on the project site. The Planning Board and/or Conservation Commission may want to request documentation of coverage under the CGP and a copy of the SWPPP and/or monitoring reports. Response: The entire lot contains one acre. Portions of the lot will remain undisturbed such that less than an acre of the lot will be disturbed. Conservatively assuming that the entire lot uphill of the hay bales is disturbed, approximately 40,900± sf or 0.94± acres will be disturbed. As such, an NPDES CGP is not required for this project. Should you have any comments or require any additional information concerning the revisions above, or have any additional questions, feel free to contact us. Sincerely, ANDOVER CONSULTANTS, INC. James S. Fairweather Il, P.E. Project Engineer Enclosures cc Eggleston Environmental Dimitrios Saragas .w Eggleston Environmental June 17, 2014 North Andover Planning Board 1600 Osgood Street North Andover,MA 01845 Attn: Curt Bellevance,Director of Community Development RE: Watershed Special Permit 107 Campion Road Dear Mr. Bellevance and Board Members: Per your request, I have reviewed the May 14, 2014 Application packet for the above- referenced project, as well as more recent site plans forwarded to me by Jean Enright and Jennifer Hughes. Included in the materials I received and reviewed were the following: • Special Permit — Watershed Permit Application, 107 Campion Road, Dimitrios Saragas, Petitioner. • Watershed Special Permit project description, 107 Campion Road, prepared for Dimitrios Saragas, by Andover Consultants Inc and dated May 14, 2014. • Site Plan, 107 Campion Road, prepared by Andover Consultants Inc. and dated March 3, 2014 with revisions through June 16,2014. • Landscaping Plan, 107 Campion Road,prepared by Andover Consultants Inc. and dated June 9, 2014 I also conducted a brief site visit on May 23, 2014 to observe existing drainage patterns. 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 and Site Plan Review and the North Andover Wetlands Bylaw. It is my understanding that the project has been or will be filed concurrently with the Conservation Commission. My review is aimed at assisting both boards in their respective reviews of the project. The proposed project is a single-family home on a presently undeveloped lot. The lot is heavily vegetated and includes an existing isolated wetland which, based on discussions with the Conservation Coordinator, appears to be perched on a layer of poorly draining soils. Existing drainage on the site follows the relatively steep topography of the site and flows overland in a westerly direction, toward Lake Coebichewick. It appears that drainage from a portion of Campion Road also drains across the site in the same direction. 32 Old Framingham Rd Unit 29 Sudbury MA 01776 tel 508.259.1137 107 Campion Road 3 June 17, 2014 minimize the need for fertilizer and watering. The use of fertilizers and other landscape chemicals on the site should be limited to organic, slow-release and low-phosphorus products. Also consistent with recently permitted projects within the District, both the limits of approved clearing and the restriction on lawn care products should be permanently recorded on the deed to the property. 7. I also recommend that the use of coal tar-based pavement sealants be prohibited on the property, as they have been determined to contribute high levels of polycyclic aromatic hydrocarbons (PAHs) to stormwater runoff. Likewise, the use of copper on the building exterior should be prohibited within the Watershed Protection District to prevent the leaching of this toxic heavy metal into the water supply. 8. It appears that the proposed project will entail the disturbance of more than one acre of land; hence it is subject to EPA's NPDES Construction General Permit (CGP) and will require filing for coverage under the CGP and the preparation and implementation of a Stormwater Pollution Prevention Plan (SWPPP) prior to construction. The SWPPP should be prepared in conjunction with the site contractor and should include a construction sequence aimed at minimizing the duration of exposure of unstabilized soils on the project site. The Planning Board and/or Conservation Commission may want to request documentation of coverage under the CGP and a copy of the SWPPP and/or monitoring reports. 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, EGGLEMN ENVIRONMENTAL Lisa D. Eggleston, P.E. C: Jennifer Hughes, Conservation Coordinator