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Home My WebLink AboutMODIFICATION Correspondence COMMUNITY AND ECONOMIC DEVELOPMENT DIVISION Building Conservation Health Planning Stevens Cstato Zoning October 17, 2019 Thomas Hodgson P.O. Box 50 Tewksbury, MA 01876 Dear Mr. Hodgson, Upon review of the Plan entitled "Site Plan for 1975 Salem Street(Lot 1),"prepared for Livingstone Development Corp,, dated October 16, 2019, The Staff Planner identified the following inconsistencies associated with the Site Plan for Special Permit for Lots 1-3 Salem Street dated October 3, 2016, revised to August 20, 2017: • The plan depicts a modification to the foundation size and shape to the building erected at 1995 Salem Street. • A new sedimentation control barrier and foundation drain are shown on the Plan. All work at the site roust stop and the following information must be submitted and reviewed by Planning: • A revised plan showing the limit of work, the as-built site grading and all impervious surfaces should be added to the Plan. • The project engineer should prepare a letter that details the plan modifications, • After construction Stormwater calculations The site plan and stormwater calculations require Stormwater Peer Review. Please do not hesitate to contact me at(978) 688-9535with any questions. Regards, Monica Gregoire, Staff Planner 120 Main Street,North Andover,Massachusetts 01845 Phone: 978.688.9535 fax: 978,688,9542 www.noriliandoverma.gov 146 Dascomb Road Andover,MA 01810 978.794,1792 TheEnglneeringoorp.00m TEC Create I Design l innovate The Engineering Corp Ms. Monica Gregoire December 13, 2019 Staff Planner Town of North Andover 120 Main Street North Andover, MA 01845 Re: 1995 Salem Street—Civil Peer Review Dear Ms. Gregoire, On behalf of the Town of North Andover, TEC, Inc. reviewed documents as part of the civil engineering peer review for the proposed development located at 1995 Salem Street in North Andover, MA. Christiansen & Sergi submitted the following documents on behalf of Livingstone Development Corp, which TEC reviewed for conformance with the approved drawings and generally accepted industry standards: • Site plans entitled "Site Plan for Special Permit for Lots 1-3 Salem Street" prepared by Christiansen & Sergi dated October 3, 2015, last revised August 20, 2017; • Interim As-built Plan for 1995 Salem Street, prepared by Christiansen & Sergi, dated October 29, 2019 • Cover letter, prepared by The Morin-Cameron Group, dated October 31, 2019; In addition to review of the documents and plans, TEC performed a field visit to the project site on Wednesday, November 27, 2019, to review current site conditions. At the time of the site visit, the Contractor had been given a "stop work" order by the Town. Upon completion of the visit, TEC has compiled the following comments for your consideration: 1. As indicated on the Interim As-built plan, it appears that the Contractor disregarded the approved limit of work. Areas outside the limit of work have been cleared and planted with loam & seed. 2. TEC concurs with CSI that the infiltration stone was installed with additional stone, approximately 25 feet longer than the approved site plan. 3, TEC concurs with CSI that the house was constructed with a different, larger footprint than shown on the approved plan. 4. Based on review of the approved site plan, and the interim as-built, the driveway has been constructed wider than the approved plan, resulting in additional impervious area. CSI should provide additional calculations to prove that the stormwater system can handle the additional impervious area. 5. The edge of the driveway where the infiltration stone has been constructed has a 1-2' drop between the infiltration stone and the rock wall. Based on the approved site plan, the grading should slope in the other direction. IlljT,ITII IIIDO CS\Letters\1995 Salem Street_,Peer c e ® o review.docx 1995 Salem StreetTEC Peer review TheEngh;eednrgCarp December 13, 2019 Page 2 of 2 6. TEC recommends that the Town of North Andover retain a consultant to provide construction observations on a weekly basis for the remainder of construction. TEC can provide additional observations, if requested. Please do not hesitate to contact me directly if you have any questions concerning our peer review at 978-794-1792.Thank you for your consideration. Sincerely, TEC, Inc. "The Engineering Corporation" Peter F. Ellison, PE Director of Strategic Land Planning T:\T0758\Docs\Letters\1995 Salem Street Peer review.docx Engineering To morrow's Solutions Today. I The Morin-Camerion 0 .....-m . -. -__WE ,jimmm January 8, 2020 Monica Gregoire Staff planner North Andover planning Department 120 Main Street North Andover, MA 01845 RE: 1995 Salem Street Dear Ms. Gregoire: We have received a review letter from TEC, dated December 13, 2019, regarding the above-mentioned property and we offer the following responses: 1. No response needed. 2. No response needed. 3. No response needed. 4. The area of the driveway shown on the Interim As-built plan shows the limit of the gravel base for the driveway in place at the time of the "Stop Work" order. The actual paved driveway will be smaller than the gravel base and will be consistent with what was approved on the design plan. The remaining gravel base outside of the pavement will be filled, foamed and seeded, The walkway shown on the as-built is also shown as the width of the gravel base and will be much smaller than the base. At this point in the construction phase, we feel performing drainage calculations is not necessary as the final pavement and walkway have not been installed. 5. We have discussed this comment with the reviewer and have agreed that a small portion along the left side of the infiltration stone will need to be filled to ensure the stormwater runoff will reach the infiltration stone as designed. 6. The majority of the site work is complete for the site. The only remaining items are to install the driveway,walkway, and foaming and seeding along the driveway and walkway. We feel it is not necessary to have a weekly inspection of the site since the remaining items are minor and Involve little or not additional earth disturbance. In our opinion, one inspection during the work and one after would be adequate. Please do not hesitate to contact our office with any questions or comments. Very truly yours J es T. Melvin, P.E. CIVIL ENGINEERS a LAND SURVEYORS ENVIRONMENTAL CONSULTANTS ® LAND USE PLANNERS 160 Summer Street, Haverhill, MA 01830 978.373.0310 Providing Professional Services Since 1978 www.morincameron.com The M6rin-Cameron October 31, 2019 Monica Gregoire Staff Planner North Andover Planning Department 120 Main Street North Andover, MA 01845 RE: 1995 Salem Street Dear Ms. Gregoire: We have received you letter dated October 18, 2019,regarding the above-mentioned property. We have performed an interim as-built and offer the following response: 1, An Interim As-built plan has been provided. The limit of work, site grading and impervious surfaces are shown. As you know, the site was under construction at the time of the stop work order and therefore some items are still incomplete. The walkway has not been installed and the driveway has not been paved. 2. The following modifications were made to the site: a. A different house footprint was built. b. The approved dwelling was designed as a garage under, however the as-built dwelling has an attached garage. c. The infiltration stone along the left side of the driveway was extended an additional 26'. d. A foundation drain was installed. e. The Limit of Work line in front of the dwelling is different from the approved Limit of Work. 3. At this point of the site construction, it would not be accurate to provide after construction stormwater calculations as most of the impervious surfaces on the lot are not in place. We have calculated the area of the approved house footprint and compared that to the as-built footprint, A covered porch was also built. The area of the as-built dwelling and porch is 134 s.f. larger than the proposed dwelling. The applicant extended the infiltration stone along the left side of the driveway an additional 26'. The additional storage provided by the infiltration stone provides an additional 187.2 c.f, of stormwater storage. The additional storage volume would handle runoff from an additional 261 s.f. under a 100yr storm event. In our opinion, the additional infiltration stone provided is capable of accepting, storing and infiltrating runoff from the increased impervious area. Very truly yours es T. Melvin, P.E. CIVIL ENGINEERS . LAND SURVEYORS . ENVIRONMENTAL CONSULTANTS ® LAND USE PLANNERS 160 Summer Street, Haverhill, MA 01830 978.373.0310 Providing Professional Services Since 1978 www.j*norincameron.com I The M6rin-Cameron pE i October 31, 2019 Amy Maxner Conservation Agent North Andover Conservation Department 120 Main Street North Andover, MA 01845 RE: 1995 Salem Street Dear Ms. Maxner: We have received you letter dated October 29, 2019, regarding the above-mentioned property. We have performed an interim as-built and offer the following response: 1. The approved limit of Work and the as-built Limit of Work are shown on the Interim As-built Plan. 2. An Interim As-built plan has been provided. The limit of work, site grading and impervious surfaces are shown. As you know,the site was under construction at the time of the stop work order and therefore some items are still incomplete. The walkway has not been installed and the driveway has not been paved. 3. The as-built detention pond and infiltration stone have been shown on the interim as-built. 4. At this point of the site construction, it would not be accurate to provide post-construction stormwater calculations as most of the impervious surfaces on the lot are not in place. We have calculated the area of the approved house footprint and compared that to the as-built footprint, A covered porch was also built. The area of the as-built dwelling and porch is 134 s.f. larger than the proposed dwelling. The applicant extended the Infiltration stone along the left side of the driveway an additional 26'. The additional storage provided by the infiltration stone provides an additional 187.2 0. of stormwater storage. The additional storage volume would handle runoff from an additional 261 s.f. under a 100yr storm event. In our opinion, the additional infiltration stone provided is capable of accepting, storing and infiltrating runoff from the increased impervious area. 5. Erosion control blankets were not installed. The site was graded in a way that reduced the slopes in the area where the erosion control blankets were proposed. The site is currently stabilized with vegetation. 6. The following modifications were made to the site; a. A different house footprint was built. b. The approved dwelling was designed as a garage under, however the as-built dwelling has an attached garage. c. The infiltration stone along the left side of the driveway was extended an additional 55'. d. A foundation drain was installed. e. The limit of Work line in front of the dwelling is different from the approved limit of Work. Very truly yours mes T. Melvin, P.E. CIVIL ENGINEERS • LAND SURVEYORS • ENVIRONMENTAL CONSULTANTS tl LAND USE PLANNERS 160 Summer Street, Haverhill, MA 01830 978,373.0310 Providing Professional Services Since 1978 www.morincameron.com