Loading...
HomeMy WebLinkAboutConsultant Review - 1661 GREAT POND ROAD 7/2/2013 Tymon, Judy From: Lisa Eggleston <lisa@egglestonenvironmental.com> Sent: Tuesday,June 18, 2013 2:02 PM To: Tymon,Judy Cc: Hughes,Jennifer Subject: RE: 1665 GPR Hi Judy, I've reviewed the June 10th response from Andover Consultants on this project, and am satisfied that it addresses most of my previous comments. I do recommend that you include the owner's ongoing maintenance of the drainage Swale as a condition of approval, as well as the usual deed restrictions on the limit of work and the use of landscape chemicals within the watershed protection district. Let me know if you have any questions. Lisa D. Eggleston, P.E. Eggleston it I 32 Old Framingham Fid., Unit #29 Sudbury, MA 01776 tel 505.259.1137 fax 566.520.7540 Tisa0egglestonenvironmental.com From: Tymon, Judy [mailto:jtymonCaltownofnorthandover.com] Sent: Tuesday, June 18, 2013 12:55 PM To: Lisa Eggleston Subject: 1665 GPR Lisa, Do you have any further comments for 1665 GPR? I just reviewed their response and it looks like that have addressed all of the issues. Let me know. Thanks, Judy Judith M.Tymon Town Planner Town of North Andover 120 Main Street North Andover,MA 01845 Phone 978.688.9535 Fax 978.688.9542 Email itvmon@townofnorthandover.com Web www.TownofNorthAndover.com 1 1 East River Place andover S I Methuen, Massachusetts 01844 71 1 Tel. (978) 687-3828 Fax(978) 686-5100 www.andoverconsultants.com June 10, 2013 North Andover Planning Board Town Offices 1600 Osgood Street North Andover, MA 01845 RE: Special Permit-Watershed Permit 1665 Great Pond Road Dear Members of the Board: Enclosed please find attached: • 2 full sized copies of a plan titled"Site Plan Great Pond Road North Andover, Mass.", prepared by Andover Consultants, Inc, revision dated June 3, 2013. • 3 11"x 17"reduced copies of the plan noted above. • 5 copies of revision summary letter, dated June 10, 20123. The revisions were made in response to review comments by your consultant, Eggleston Environmental. Should you require any additional information, or have any questions concerning the project,please feel free to contact us. Sincerely, ANDOVER CONSULTANTS, INC. James S. Fairweather II, P.E. Project Engineer Enclosures cc Technical Training Foundation Trust Civil Engineers • Land Surveyors • Land Planners 1 East River Place 7andover Methuen, Massachusetts 01844 consultants Tel. (978) 687-3828 Inc. Fax (978) 686-5100 www,andoverconsultants.com June 10, 2013 North Andover Planning Board Town Offices 1600 Osgood Street North Andover, MA 01845 RE: Watershed Special Permit 1665 Great Pond 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 May 20, 2013. Five copies of the revised plan revision dated June 3, 2013 are attached. The plan was revised in response to the review comments are as noted below: Comment 1. The proposed development activity is located within Non-Disturbance and Non- Discharge Zones of the Watershed District. It is my understanding that this lot was created before October 24, 1994, hence the limitations of the General Zone of the Watershed Protection District regulations do not apply. As shown, the project includes clearing, grading and construction of a paved driveway and associated drainage structures within the Non-Disturbance Zone and construction of a new house within the Non-Discharge Zone. Regrading and vegetation removal are allowable in the Non-Disturbance Zone only by Special Permit. Construction of a new permanent structure within the Non-Disturbance Zone is also allowed only by Special Permit and only after a variance has been granted by the Zoning Board of Appeals. I believe that a driveway would be considered a permanent structure under the Town's Zoning Bylaw; therefore a variance from the ZBA is needed for this project. Response: A Special permit is required for the proposed work; however, a variance is not required for this project. The proposed dwelling is outside of the Non-Disturbance Zone and a driveway is not a structure, see Section 2-Definitions in the North Andover Zoning Bylaw (Section 2.68- Structure). Comment 2. The boundaries of these buffer zones are based on the horizontal setback from the edge of all wetland resource areas as defined by the Wetlands Protection Act and the North Andover Wetland Bylaw. It is not clear whether the wetland boundaries shown on the plan have been confirmed by the Conservation Commission, e.g. through an ANRAD or NOL Response: A Notice of Intent (NOI) was filed with the Conservation Commission in April 2013 (DEP File No 242-1595). As part of the filing Jennifer Hughes, Conservation Administrator, reviewed the wetland boundaries. Two wetland flags, numbers 15 and 30, were moved 5 feet uphill from their original position. The revised locations for these two flags are depicted on the revised plan. Civil Engineers * Land Surveyors 9 Land Planners andover consultants !no. Comment 3. The Plan should also show 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 and 200 foot lateral distance from the upper boundary of the bank of a tributary or associated surface water body. Response: Although not required by the special permit bylaw, the additional boundaries have been depicted on the revised plan. The entire lot is essentially within 400 feet of Lake Cochichewick and about half(eastern) of the lot is within the 200 foot boundary to the wetland bordering an associated water body, Rae's Pond. We have also added the 325 foot Non-Discharge Zone from Lake Cochichewick. The 325 foot zone from the adjacent wetland is well off the lot. Comment 4. The Plan should show the proposed edge of vegetation clearing/limit of work. While much of the proposed development area is already cleared, the creation of any new lawn or landscaped area should be limited to that which is absolutely necessary and 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 Planning Board may also want to request a planting or landscape plan for the property. Response: The limit of work along the easterly side of the site is defined by the proposed hay bale line. The remaining limit of the work, along the westerly side, including demolition of the existing garage, has been added to define the work area. The use of native vegetation can be conditioned in the permit. Comment S.As with similar projects permitted within the Watershed Protection District, both the limits of approved clearing and the Board's standard restriction on lawn care products should be permanently recorded on the deed to the property. Response: Noted, the limits of the work are now depicted for the Board's review. Comment 6. The narrative indicates that roof runoff from the proposed house will be directed onto lawn areas for infiltration; however it is not clear from the plan how this is to be accomplished. Response: Runoff from the roof will fall directly on lawn areas in the event that no gutters are installed. If gutters are installed, the leaders can be easily directed to the lawn areas per standard practice. Comment 7. The plan calls for driveway runoff to drain to a stone trench along the northern edge of the driveway, which in turn drains to a 60 ft flat swale at the base of the driveway (within the 100 ft buffer zone). The plan also calls for a 8-in overflow pipe from the swale under the driveway, discharging toward Great Pond Road. It is not clear why this overflow pipe is needed, as the trench and swale should be designed to handle all of the runoff from the proposed driveway. Response: There was a drafting error in the initial submittal which improperly indicated east to west flow from the culvert and an overflow diversion. However, the culvert is not intended to be an overflow. The driveway culvert is intended to slope west to east to drain the west side of the driveway without runoff from this area running over the new driveway. The revised invert data for the culvert is depicted on the revised plan. andover consultants j inc. Comment 8. Given its nearly 10 percent grade, I recommend adding check dams in the stone trench to slow the rate of flow and promote infiltration. Response: Check dams have been added as recommended. 6 inch wide by 3 inch high washed pea stone check dams have been added to the driveway swale spaced every 40 feet. Comment 9. A design detail for the proposed swale is needed. Given its proximity to wetland resource areas and the town's water supply the swale should be designed to maximize water quality treatment and promote infiltration, e.g. incorporating a bioretention area with an overflow Swale. Response: The swale is approximately 64 feet long, 2 feet wide with a flat slope. Additional crushed stone, 2 feet wide by 10" deep has been added to the invert of the swale. Also, washed pea stone check dams spaced every 20 feet have been incorporated to enhance treatment and promote additional infiltrative capacity. Comment 10. Ongoing maintenance and preservation of the proposed stormwater management structures should be addressed. Response: Maintenance of the stone trench will generally consist of occasionally sweeping of the driveway, as needed, to remove winter sanding. Leaves, grass clippings and other yard debris will need to be removed by raking, also as needed. 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. f James S. Fairweather Il, P.E. Project Engineer Enclosures cc Eggleston Environmental Technical Training Eggleston Environmental May 20, 2013 North Andover Planning Board 1600 Osgood Street North Andover, MA 01845 Attn: Judy Tymon, Town Planner RE: Stormwater Review 1665 Great Pond Road WSP Dear Ms. Tymon and Board Members: Per your request, I have conducted a technical review of the March 28, 2013 Watershed Special Permit Application packet submitted by Andover Consultants, Inc. for the above- referenced project. Included in the materials I received and reviewed were the following: ■ Watershed Special Permit Application, 1665 Great Pond Rd Lot B, Technical Training Foundation Trust, Petitioner, prepared by Andover Consultants, Inc. and dated March 28, 2013. ■ Site Plan, Great Pond Road, prepared for Technical Training Foundation Trust by Andover Consultants Inc. and dated March 28, 2013. 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 Wetlands Protection Act and Regulations, and the North Andover Wetlands Bylaw. It is my understanding that either a Notice of Intent (NOI) application or an Abbreviated Notice of Resource Area Delineation (ANRAD) has been or will be filed with the Conservation Commission for this project. My review is aimed at assisting both the Planning Board and the Conservation Commission in their respective reviews of the project. The proposed project entails the construction of a single family home and driveway on a mostly vacant lot. The lot is wholly within North Andover's Watershed Protection District, and portions of the lot are also within the buffer zone of regulated wetlands. My comments on the proposed plan are outlined below: 1. The proposed development activity is located within Non-Disturbance and Non- Discharge Zones of the Watershed District. It is my understanding that this lot was created before October 24, 1994, hence the limitations of the General Zone of the Watershed Protection District regulations do not apply. As shown, the project includes clearing, grading and construction of a paved driveway and associated 32 Old Framingham Rd Unit 29 Sudbury AAA 01776 tel 508.259.1137 fax 866.820.7840 1665 Great Pond Rd WSP, Stormwater Review 2 May 20, 2013 drainage structures within the Non-Disturbance Zone and construction of a new house within the Non-Discharge Zone. Regrading and vegetation removal are allowable in the Non-Disturbance Zone only by Special Permit. Construction of a new permanent structure within the Non-Disturbance Zone is also allowed only by Special Permit and only after a variance has been granted by the Zoning Board of Appeals. I believe that a driveway would be considered a permanent structure under the Town's Zoning Bylaw;therefore a variance from the ZBA is needed for this project. 2. The boundaries of these buffer zones are based on the horizontal setback from the edge of all wetland resource areas as defined by the Wetlands Protection Act and the North Andover Wetland Bylaw. It is not clear whether the wetland boundaries shown on the plan have been confirmed by the Conservation Commission, e.g. through an ANRAD or NOL 3. The Plan should also show 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 the land area within a 400 foot lateral distance from the upper boundary of the bank of a Class A surface water source and 200 foot lateral distance from the upper boundary of the bank of a tributary or associated surface water body. 4. The Plan should show the proposed edge of vegetation clearing/limit of work. While much of the proposed development area is already cleared, the creation of any new lawn or landscaped area should be limited to that which is absolutely necessary and 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 Planning Board may also want to request a planting or landscape plan for the property. 5. As with similar projects permitted within the Watershed Protection District, both the limits of approved clearing and the Board's standard restriction on lawn care products should be permanently recorded on the deed to the property. 6. The narrative indicates that roof runoff from the proposed house will be directed onto lawn areas for infiltration; however it is not clear from the plan how this is to be accomplished. 7. The plan calls for driveway runoff to drain to a stone trench along the northern edge of the driveway, which in turn drains to a 60-ft flat swale at the base of the driveway (within the 100-ft buffer zone). The plan also calls for a 8-in overflow pipe from the swale under the driveway, discharging toward Great Pond Road. It is not clear why this overflow pipe is needed, as the trench and swale should be designed to handle all of the runoff from the proposed driveway. 1665 Great Pond Rd WSP, Stormwater Review 3 May 20, 2013 8. Given its nearly 10 percent grade, I recommend adding check dams in the stone trench to slow the rate of flow and promote infiltration. 9. A design detail for the proposed swale is needed. Given its proximity to wetland resource areas and the town's water supply the swale should be designed to maximize water quality treatment and promote infiltration, e.g. incorporating a bioretention area with an overflow Swale. 10. Ongoing maintenance and preservation of the proposed Stormwater management structures should be addressed. I appreciate the opportunity to assist the North Andover Planning Board and Conservation Commission 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