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HomeMy WebLinkAbout2016-04-05 Stormwater Response Comments I East River Place andover Methuei), Massacln setts 01844 consultants T)i . Tel, (978) 687-3828nc VZ Fax (978) 686-5100 www.andovercoi-isultar)ts.corri February 10, 2016 North Andover Planning Board Town Offices 1600 Osgood Street North Andover, MA 01845 RE: Watershed Special Permit 1,665 Great Pond Road Technical Training Foundation Trust Dear Ms. Enright and Members of the Board, The following are responses to comments from Eggleston Environmental dated January 5, 2016 for the above referenced project. Eggleston Environmental comments are listed below in italic type, with Andover Consultant's response following immediately below in bold type. 1. The Watershed Protection Zones shown on the plan appear to be based only on setbacks fi-om Lake Cochichewick. Rea's Pond to the east of the property is a tributary wetland within the Watershed Protection District and may also have protection zones that extend onto the property. As the lot was created prior to October 24, 1994, the Non-Disturbance Buffer Zone extends from the edge of the wetlands within the Watershed Protection District (WPD) 100 feet, as measured from the boundary of Rea's Pond, this does not extend onto the property. As all proposed work is currently within the Non-Discharge Buffer Zone of Lake Cochichewick (as shown on the site plan), any such setback from Rea's Pond is irrelevant. 2. The proposed project is an allowable use under Section 4.136 (3)(c) of the Zoning Bylaw. However, since the proposed new house would not be in the same footprint as the existing structure, it is unclear whether it would be considered replacement of all existing permanent structure or construction of a new permanent structure under the Bylaw. Construction q1'a new permanent structure requires a varianceftoin the Board qfAppeals, The applicant has been granted a variance from the Board of Appeals at their February 9,2016 meeting. P3 1 Al2.3AJXSW 62 IWO 1602� 10_EgJeVt Responw to Cwaarftdoc C'MI Engineen,,.-, * 1-and Surveyors * Land Planners andover constfltaints \ i In C, 3. It should be clarified whether the "edge of water" shown on the plan represents the annual mean high water mark of Lake Cochichewick as is required under Section 4.136(4)(c) of the Bylaw. Likewise, the edge of all wetland resource areas within 400feet of the property (including Rea Pond) needs to be confirmed by the Conservation Commission. The edge of water for Lake Cochichewick and the wetlands associated with Reals Pond were previously reviewed by Jennifer Hughes as part of a Notice of Intent filed for the abutting property in April of 2013 (DEP File No 242-1595). 4. The alternatives analysis should address why the proposed new structure needs to be located approximately 12feet closer to the lake than the existing house. The proposed dwelling was moved closer to the lake to comply with the zoning bylaw's minimum required side setback of 30 feet. As previously stated, the proposed dwelling location was approved by the Board of Appeals at their February 9, 2016 meeting. S. Section 4.136(3)(c) of*the Bylaw calls for all construction in the Watershed Protection District to comply with Best Management Practices (BMPs) for erosion, siltation, and stormwater control to protect the lake and groundwater resources. Section 4.136(4)(g) requires that, within the Non-Disturbance and .Non- Discharge Zones any runoff front impervious surfaces be recharged onsite or, where recharge is infeasible, other BMPs be employed. As shown on the plan, however, the proposed project does not provide any groundwater recharge or stormwater BMPs other than temporary erosion controls. Particularly since an entirely new structure is proposed, it should be feasible to direct the roof runoff into drip trenches or dtywells, with any overflows directed onto pervious surfaces. It may also be possible to grade the reconstructed portion of the driveway to drain toward a bioretention area or infiltration trench, or at least onto pervious areas, rather than directly downslope toward the lake cis it currently does. Section 4.136(4)(g) of the Bylaw, referenced above, states "Within the Non- Disturbance Zone and Non Discharge Buffer Zone, any runoff from impervious surfaces shall, to the extent possible, be recharged on site and diverted towards areas covered with vegetation for surface infiltration." As currently designed, all new, impervious surfaces shown on the site plan are diverted towards areas covered in vegetation for surface infiltration as required by the Section 4.136(4)(g). However, to further encourage the recharge of stormwater within the WPD, the site plan has been revised to show runoff from the roof diverted towards a subsurface recharge trench sized to capture Y2" of roof runoff volume. 6. 1 note that a portion of the existing driveway and a retaining wall are located on the abutting property to the west of the project site, and there is a lawn area that appears to be associated with the existing home that extends onto the abutting property to the east. It should be confirmed that no work is proposed on either of these abutting properties. PAIZ12-321AXSW 624MO16 02. to Car"mk.cW. andover Mc. The existing driveway area and retaining wall noted above have existed for more than 30 years. The proposed site plan does not propose any work on abutting properties. 7. The plan should clearly indicate all structures and impervious stufaces to be removed from the site and should identify all proposed suiJaces (including vegetation) within the limit of work. The "Existing Conditions" portion of the plan has been updated to aid in identifying features that will be removed as part of the proposed site development. As an existing dwelling and mowed lawn currently exist on the lot, any lawn area disturbed as part of the development will be replaced in kind. 8. As with similar projects in the Watershed Protection District, the creation of new lawn area be limited to that which is absolutely necessary, and any new landscaping should be constructed in such a manner as to minimize the maintenance that is required, e.g. the soil should be well aerated, it should have a minimum of 6-inches of topsoil and, where possible, native vegetation should be planted to 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 phosphorusproducts. 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. The applicant agrees to restrictions that are consistent with similar projects within the WPD. A note has been added to the plan to specify that "The use of fertilizers and other landscape chemicals on the site should be limited to organic, slow-release and low-phosphorus products" 9. 1 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 ofpolycyclic aromatic hydrocarbons (PAI-Is) to storinwater runoff . The applicant agrees that coal tar-based pavement sealants will not be used as part of the development. 10. It should be confirmed that the proposed house design does not call for any copper or other architectural metal. Runoff from metal roofs (or roofing elements) cannot be infiltrated in a Zone A and should be prohibited within the Watershed Protection District to prevent the leaching of toxic heavy metals into the water supply. The proposed house design does not call for any copper or other architectural metal. 11. The proposed project will entail less than an acre of land disturbance and will not require coverage under the EPA Construction General Permit. The Planning Board may therefore want to require that the applicant or site contractor submit an erosion control plan prior to any site disturbance. At a minitnum, a construction schedule aimed at minimizing the total P MZ17-37AXSVOk 62-IM16-02- io FqqOMW-ReWA to C�U d� andover consuRants h1c. area and duration of soil disturbance/stockpiling should be provided. Given the slope and proximity to the lake, I also suggest that silt fence be used in addition to the proposed staked hay bales (or with straw wattles) to prevent erosion and sedimentation. Prior to construction, the contractor can supply the Board with a Construction Schedule as suggested. Sincerely, ANDOVER CONSULTANTS, INC. Dennis A. Griecci, P.E., LEER AP Senior Project Engineer Enclosure Cc Technical Training Foundation Trust Eggleston Environmental PAI Al 2-32%oVot 62-1901 r,02. 10 E, 2125/2016` Town of North Andover Mail-1665 Great Pond Road-Revised Plan NOR COVER Massac hu� Jean Enright <jenright@northandoverma.gov> gym,,..,. 1665 Great Pond Road - Revised [plan 1 message Dennis Griecci <dgriecci@andoverconsultants.com> Thu, Feb 25, 2016 at 8:25 AM To: Jendght@northandoverma.gov Cc: Lisa Eggleston <lisa@egglestonenvironmental.com> Jean. The attached plan has been revised based on minor comments from Lisa's email on 2/22/16 and the phone conversation you and I had yesterday. The revised plans addressing the following: ® A roof drain has been added showing the front gutter connected to, and draining to, the sub surface system in the rear of the dwelling. ® The grades on the proposed driveway overlay have been adjusted to show that stormwater runoff from this area is to be directed towards the yard area. O Per Table 2 of Section 4.136 (lots created prior to 10/24/1994) there is a 325' Non-Discharge and 100' Non-Disturbance setback from the wetlands associated with Rea's Pond. The 325' setback has been added to the plan, the 100' setback does not reach the property. Also attached is a memo we used to determine the mean high water of Rea's Pond along with field confirmation. If you have any questions about the attachments please do not hesitate to call or email. If you could also please let me know how many hard copies you will need I can bring them to the hearing next week. Thank you, Dennis 112 -2/2-5/2016 Town of North Andover Mail 1665 Great Pond Road-Revised Plan Dennis A. Griecci, P.E., LEE® AP Senior Project Engineer/Associate Andover Consultants, Inc. Civil Engineers I Land Surveyors I Land Planners 1 East River Place Methuen, MA 0 1844 Phone:(978)687-3828 1 Fax:(978)686-5100 dgriecci@andoverconsultants.com www.andoverconsultants,com 2 attachments aw% Great Pond Road—Rev-2016-02-24.pdf 533K Lake Cochichewick—Water Elevation.pdf 32K https.-,Ilmail.google.com/mail/Ld0/?u'i=28dk=7c2eff6265&view=pt&search=inbox&th=1 53189b4eObe4bff&siml=153189b4eDbe4bff 212 andover 1 East River Place consultants Methuen, Massachusetts 01844 Tel. (978) 687-3828 inc. Fax (978) 686-6100 www.andoverconsultants.corn E c March 10, 2016 North.Andover Planning Board Town Offices 1600 Osgood Street North Andover, MA 01845 t t RE: Watershed Special Permit � i 1665 Great Pond Road Technical Training Foundation Trust Response to Conservation ConnnAssion Memorandum x Dear Ms. Enright and Members of the Board, The following is a response to Jennifer Hugh's memorandum dated February 25, 2016 for the above referenced site. Ms, Hughes' genera comments are Iisted below in italic type, with Andover Consultant's response following immediately below in bold type. Please see Ms, Hughes' zneano for her complete comments. t 1. It is likely that Bank and BVW associated with the lake are higher than the edge of water } shown. { Norse Environmental Services Inc visited the site on March 8, 2016 for resource area delineation along the Lake in front of lot before the Board. His memo elated March 8, 2016 was sent to Jean Enright for distribution to Town departments. in summary, g Norse determined that no wetland vegetation or wetland soil exists between the Lake and the Great Pond Road. 9 Per 310 CMR10.54(2)(1) "The upper boundary of a Bank is the first observable break in slope or the mean annual flood level, whichever is lower". In this case, the mean � annual flood level is lower (elevation. 113.67), which would then be used to determine the "Bank" of the Lake. As such, in the inost recently revised plan, dated March 10, 2016 annual mean high water was :also labeled as "Bank". 2. The 3.25' .Non Discharge Buffer Zone fi oin the edge of the wetlandslRea's Pond is an approximate distance and it does not accurately reflect the varied delineation of the BVIf and is more of an arch associated with the wetland. ` E P.117423?'.6�stlr162[5521F6II3 '. 16.F� +4xae aCmm.Xf,Av '.. Civil Engineers e Land Surveyors o Land Planners � andover ;'3��cnns�kas�ts 1 inc. The 325` Non-Discharge Buffer Zone setback is an accurate setback from the field surveyed location of the wetland flags associated with Rea`s Pond. As the offset from the wetlands grows, the parallel line representing that offset would appear more and more arched,which is the case in this instance. If you have any questions concerning the above information, or require anything further, please feel free to contact me at your convenience. r t B Sincerely, .A.NDOVER CONSULTANTS, INC. Dennis A. Griecci,P.E., LEED AP Senior Project Engineer "s Enclosure Cc € Technical Training Foundation Trust s E S� ES Y T i i 3 I. E c i P.F12SYJZdraYA62S9i70�641 '., !0-F�.�+s��Sa tarct�tsds [s NORSE ENVIRONMENTAL SERVICES, INC. 92 Middlesex Road, Unit 4 '40 Tyngsboro, MA 01879 TEL. (978) 649-9932 • FAX(978) 649-7582 Website: www.norseenviron meet aLcom March 8, 2016 Andover Consultants I East River Place Methuen, Ma. 01844 Re: #1665 Great Pond Road North Andover Sirs; I performed a site visit for resource area delineation on the above site on this date. Across the street from the existing dwelling is Lake Cochichiwick, This is a large lake used as a water supply for the Town of North Andover. The lake itself is a resource area, Land Under Water Bodies as defined in 310 CMR 10.56(2) with associated Banks as defined in 310 CMR 10.54(2). The bank is well defined, as it is a two to three foot drop from the ground elevation to the pond elevation. Between the bank and the road, there is no wetland vegetation or wetland soil. Sincerely, Steven Eriksen