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HomeMy WebLinkAbout10/13/2020 - HWG Review Letter - - 1450 Osgood Street %�. Horsley Wiften Group 0 SUStainable, Ehvirownental Solutions 112 W'at r `tr t-61 Floor-Boston,MBA 02109 .......... 5 -2 1 ho,r 1 ten October 13, 2020 Ms. Amy Maxner, Conservation Administrator Conservation Commission Town of North Andover 120 Main Street North Andover, Massachusetts 01845 Ref: 1600 Osgood Street North Andover, Massachusetts DEP File No. 242-1766 Dear Ms. Maxner and Commissioners: The Horsley Witten Group, Inc. (HW) has reviewed the stormwater management design for the proposed development at 1600 Osgood Street on behalf of the North Andover Planning Board. HW has provided the Planning Board with four peer review letters dated September 10, 2019, October 10, 2019, September 14, 2020, and September 21, 2020. The following documents are the most recently reviewed by HW: • Stormwater Management Report for Proposed Redevelopment, 1600 Osgood Street, North Andover, Massachusetts, prepared by Langan Engineering & Environmental Services, Inc., dated August 2019 and revised September 2020 (502 pages). • Memorandum to Jean Enright, from Casey Raczkowski (Langan), regarding Stormwater Peer Review, dated September 16, 2020. (8 pages). • Permit Site Plans — North Andover, Massachusetts, Proposed Redevelopment for Hillwood Enterprises, L.P. and 1600 Osgood Street, LLC., Distribution Facility, 1600 Osgood Street, prepared by Langan Engineering & Environmental Services, Inc., last revised September 16, 2020 (146 sheets). Stormwater Management Review It is HW's opinion that the Applicant has designed the stormwater management system for the proposed development at 1600 Osgood Street in compliance with the Massachusetts Stormwater Management Standards (MSWMS) as listed in the Massachusetts Stormwater Handbook dated February 2008. The stormwater management has been designed in compliance with the North Andover Stormwater Management and Erosion Control Regulations adopted February 5, 2011, and the North Andover Stormwater Management and Erosion Control Bylaw. The Applicant has adequately addressed HW's comments raised during the peer review process. The Applicant has provided documentation to verify that the proposed development will not discharge untreated stormwater which may cause erosion in wetlands of the Commonwealth per MSWMS #1 and has documented that the post-development runoff will not exceed pre- Town of North Andover October 13, 2020 Page 2 of 2 development runoff offsite in compliance with MSWMS #2. Furthermore, the Applicant has provided adequate recharge per MSWMS #3 and has managed the water quality in compliance with MSWMS #4. The Applicant has also met the requirements of MSWMS Standards 5, 6, 7, 8, 9, and 10 as applicable. HW understands that a downgradient culvert exists that is located beneath the MBTA rail on an abutting property. It is HW's experience that when an Applicant meets the MSWMS and therefore is not increasing runoff to a downgradient structure it is not the Applicant's responsibility to maintain the downgradient culvert. It is the Applicant's responsibility to maintain its own property including routine sweeping, cleaning of debris, and regular inspection as well as maintenance of the stormwater practices located within its property boundaries. HW has not inspected the culvert on the abutting property. It is HW's belief that the structural integrity of the culvert will be or has been reviewed by the MBTA as is the MBTA's standard protocol. Please contact Janet Bernardo at 508-833-6600 or at jbernardo@horsleywitten.com if you have any questions regarding these comments. Sincerely, HORSLEY WITTEN GROUP, INC. F Janet Carter Bernardo, P.E. Senior Project Manager CC: North Andover Planning Board , . r i . . .I . L �t .1011w �l1 .w" . . � � l..d i ll a t] i .',, I 1