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Home My WebLink About2015-07-28 Stormwater Review DTO SP MOD Eggleston Environmental July 17,2015 North Andover Planning Board 1600 Osgood Street North Andover, MA 01845 Attn: K ristine,Cheetham, Town Planner RE: Stormwater Review West Mill Redevelopment—Revised Design Dear Ms. Cheetham and Board Members: Per your request, I have reviewed the July 2015 revised design for the West Mill Redevelopment Project at 4 High Street. Included in the materials I received and reviewed were the following: • Request to Amend Order of Conditions, West Mill Redevelopment Project, 4W High Street, prepared for RCG West Mill NA LLC by Horsley Witten Group, Inc. and dated July 2015. • West Mill Redevelopment Construction Plans, North Andover, MA (17 Sheets), prepared for RCG West Mill NA LLC by Horsley Witten Group, Inc. and dated July 2015. • Stormwater Analysis and Drainage Report, West Mill Redevelopment, 4W High Street, prepared for RCG LLC by Horsley Witten Group, Inc. and dated July 2015. • O&M Report, West Mill Redevelopment, 4W High Street, prepared for RCG LLC by Horsley Witten Group, Inc. and dated July 2015. 1 also discussed the revisions with several members of the Horsley Witten design team via telephone, and received a revised Drainage map and Sheet C-12 via email on 7/16/15. Both documents should be included in the Board's final record copy. My comments on the revised submittal are outlined below: 1. Overall, the design revisions are consistent with the previous "Low Impact" design approach, and the proposed redevelopment project complies with the Massachusetts Stormwater Standards to the maximum extent practicable. It also provides a net improvement over existing conditions with respect to stormwater management. 32 Old Framingham Rd Unit 29 Sudbury MA 01776 tel 508.259.1137 i West Mill Redevelopment, Revised Design 2 July 17, 2015 2. The removal of Building 37 clearly has a beneficial impact from the standpoint of stormwater management, resulting in a decrease in runoff volume and enhanced infiltration on the site. The Board should be aware, however, that the revised drainage system design for the West Mill project is sized only for the proposed development shown on the plan; any future development within the former footprint of Building 37 will need to incorporate appropriate drainage controls. 3. As discussed with Conservation Administer Jennifer Hughes, the removal of Building 37 would result in a decrease in the volume of flow to the existing detention basin, since the roof drainage from the building presently discharges directly to the basin. The basin is a regulated resource area under the Wetlands Protection Act. The loss of flow has been mitigated to some extent by the proposed grading in the Building 37 footprint, and the continued discharge of roof drainage from the mechanical building. The basin may also receive some of the increased groundwater recharge as a result of the conversion to a pervious surface. 4. Lastly, I note that while the rest of the plans indicate that the existing mechanical building is to remain, the Site Demolition and Erosion Control Plan (Sheet C-3) includes the building in the area to be demolished. This should be corrected. Once again, 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,North Andover Conservation Administrator f bg modMod.0MNI5 p,,Wed;07116I15typk K'Praytd001417 4077 RCG LLC-We st Vd Noah And-vDr-ingx-1407A I 4077ST.d+yg f CIA i K In OR Rx f pT' - 171 m 11 m IjJ a i m sr gp O � I a C e amQ � ✓ 4 &A 4of � n S&C BIAssa.Yn.as.lx. RCG\EST MILL PA LLC WEST MILL.REDEVELOPMENT Hsior,ey TMWW.Gu p�,In„. �e�iskns CONSTRUCTION PLANS M-f hams W h6b56)•.5 S Nvch MA p nr,.n� _ NORTH ANDOVER,MASSACHUSETFS PLAZA SECTION A-A Cheetham, Kristine From: Lisa Eggleston <Iisa@egglestonenvironmental.com> Sent: Friday,July 17, 2015 9:11 AM To: Jon Ford Cc: Seth Zeren; Kfoury, Eric; David Steinbergh; Hughes, Jennifer; Cheetham, Kristine Subject: Re:West mill center lot Thanks Jon, think I'm all. set. Lisa D. Eggleston, P.E. Eggleston Environmental 32 Old Framingham Rd, Unit #29 Sudbury, MA 01776 Tel 508.259.1137 From:Jon Ford < > Date:Thursday,July 16, 2015 at 2:45 PM To: Lisa Eggleston <I�sa e gl stonenvironmentalxom> Cc:Seth Zeren<szere,n�rc -�Ilcxom,>, Eric Kfoury<LKfg.1!ry@ L rn owngfriorthando�erco >, David Steinbergh <4dgstgejinhkL&h rcg-iGc corgi>,Jennifer Hughes<IbLi he wnofnorthaiidov,er.coin>, Kristine Cheetham <KCheetliaLn@townofnorthandover.coni> Subject: RE: West mill center lot Good afternoon Lisa, Following up on our discussion this morning, I have attached a revised sheet C-12.This sheet includes additional cross- sections to describe the bioretention and storage design in the center green space,The design has not changed, If this answers your questions,we can formally submit a stamped drawing to replace the previous sheet C-12. Please do not hesitate to contact me with any further questions, Thank you, Jon From: Lisa Eggleston [maiito:lisa(e lestonenvironrrIgfat 1,ggn Sent: Thursday, July 16, 2015 10:18 AM To: Seth Zeren; Eric Kfoury; Jon Ford; David Steinbergh; Jennifer Hughes; Kristine Cheetham Subject: Re: West mill center lot Jon (Et Seth), I am currently working on this review and have a couple of questions. Do you have a revised post-development drainage area map? The one in the stormwater report seems to be for the previous design and I'm having a hard time meshing it with the current model., particularly in the "center green" area. Also, what I'm looking at are the construction drawings, e.g. a whole new set of plans. I'm assuming that my rote is to review the modifications to the design, and not consistency overall, so could you help focus my attention on which plans actually have changes? Thanks, feet free to give me a call if its easier to talk through - I wil.t be in all morning. Lisa D. Eggleston, P.E. Eggleston Environmental 32 Old Framingham Rd, Unit #29 Sudbury, MA 01776 Tel 508.259.1137 From:Seth Zeren <seren rc ilc.com> Date:Wednesday,July 15, 2015 at 12:20 PM To: Lisa Eggleston Eric Kfoury corn>,Jon Ford <jfqEq@hMLg >, David Steinbergh Jennifer Hughes Kristine Cheetham <KCheethanl townofiiorthandover.com> Subject: West mill center lot Hello Lisa, Hope that you're doing well. Please let us know if you have any questions regarding our plan modification. As you know, we are hoping to get a quick turn around this week to allow this project to move forwarding August. Thanks again for your help, Seth 2