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Home My WebLink About10 Union St, Rt 6A, YAP MNL 20261008 Patrick Hutchinson Environmental Scientist 23-5141-0120 October 8, 2026 Yarmouth Conservation Commission Town Hall 1146 Route 28 South Yarmouth, MA 02664 Re: Notice of Exempt Gas Main Replacement Activities Union Street and Route 6A, Yarmouth Port, Massachusetts Dear Members of the Yarmouth Conservation Commission: Boston Gas Company respectfully submits this written notification of the intent to conduct exempt gas main replacement activities located in the roadway right-of-way (ROW) on Union Street and Route 6A in Yarmouth Port, Massachusetts. The proposed work consists of the relay of approximately 3,865 linear feet of four-inch subsurface coated steel gas main with six-inch plastic gas main from 10 Union Street to Route 6A eastward to the intersection of Route 6A and Hockanom Road. Portions of the proposed work will take place within Bordering Land Subject to Flooding, the 200-foot Riverfront Area to Whites Brook, and the 100-foot Buffer Zone to Bank and Bordering Vegetated Wetlands. The location of the project area is depicted on the Site Location Map included as Attachment A. The proposed work is considered to be exempt from the Massachusetts Wetlands Protection Act (MA WPA, M.G.L. c. 131 §40) in accordance with 310 CMR 10.02(2)(a)(2), as the work consists of “activities conducted to maintain, repair or replace, but not substantially change or enlarge an existing and lawfully located structure or facility used in the service of the public and used to provide electric, gas, water, sewer, telephone, telegraph and other communication services, provided said work utilizes the best practical measures to avoid or minimize impacts to wetland resource areas outside the footprint of said structure or facility.” The Town of Yarmouth Wetlands Protection Bylaw (Chapter 143, Section 1.02(3b)) provides a similar exemption. This letter is intended to serve as a written notice of exempt work. In general, the gas main activities will entail the excavation of an approximately two -foot wide trench for safe installation. The trench bottom will be excavated and graded such that the pipe will be supported for its entire length on undisturbed bottom at a depth of approximately three feet below surface grade. The trench will be excavated within the existing impervious surface of Union Street and Route 6A, with the precise location of the gas line to be determined in the field so that existing utilities can be avoided . Upon installation of the replacement line, the trench will be backfilled and restored in -kind. No direct impacts to wetland resource areas are anticipated as a result of this project. This work is primarily within the existing paved roadway. Best Management Practices (BMPs) will be implemented as needed. Attachment B of this submittal includes details of standard erosion control measures that have been used in past projects of similar scope. Following the completion of construction activities, disturbed areas will be restored in-kind. - 2 - Please refer to the attached Site Location Map for the project location. Should you have any questions regarding this notification or require any additional information, please do not hesitate to contact me at (774) 384-5221 or my agent, Maria Johnsenberg, Project Manager with Tighe & Bond, at (508) 304-6343 or via email at MJohnsenberg@tighebond.com. Thank you in advance for your attention to this matter. Respectfully, Patrick Hutchinson Environmental Scientist National Grid 170 Data Drive, Waltham, MA 02451 Attachments: A – Site Location Map B – National Grid Best Management Practice Details Attachment A A Created by:Created for: THIS DOCUMENT IS INTENDED FOR GENERAL PLANNING & INFORMATION PURPOSES ONLY. ALL MEASUREMENTS & LOCATIONS ARE APPROXIMATE. File Location: G:\GIS\MA\SiteLocus\Yarmouth\NGridRoute6APipeRelay_N5141\NGridRoute6APipeRelay_N5141.aprx\Fig1_Topo_Route6A_UnionStGasPipeline Date Saved: 9/30/2026 10:43 AM Index Map Ü 1 inch = 1,000 feet 0 500 1,000 Feet Based on USGS National Map Topo Basemap. Contour Interval Equals 10 Feet. Figure 1 Site Location Route 6A and Union Street Yarmouth, Massachusetts UTILITY MAINTENANCE - GAS PIPELINE REPLACEMENT,SITE LOCATIONSITE LOCATION Gas Pipeline Replacement Attachment B A ENVIRONMENTAL GUIDANCE Date Doc. No.EG-303NE 02/20/18 SUBJECT Access, Maintenance and Construction Best Management Practices Reference EP No. 3 - Natural Resource Protection (Chapter 6) Rev. No. 4 SEC-1 WEED FREE BALE BARRIER BMP DETAIL BMP PICTURE Page: 7-1 ENVIRONMENTAL GUIDANCE Date Doc. No.EG-303NE 02/20/18 SUBJECT Access, Maintenance and Construction Best Management Practices Reference EP No. 3 - Natural Resource Protection (Chapter 6) Rev. No. 4 SEC-2 SEDIMENT CONTROL FENCE BMP DETAIL BMP PICTURE Page: 7-2 ENVIRONMENTAL GUIDANCE Date Doc. No.EG-303NE 02/20/18 SUBJECT Access, Maintenance and Construction Best Management Practices Reference EP No. 3 - Natural Resource Protection (Chapter 6) Rev. No. 4 SEC-3 SILT FENCE / WEED FREE BARRIER BMP DETAIL BMP PICTURE Page: 7-3 ENVIRONMENTAL GUIDANCE Date Doc. No.EG-303NE 02/20/18 SUBJECT Access, Maintenance and Construction Best Management Practices Reference EP No. 3 - Natural Resource Protection (Chapter 6) Rev. No. 4 SEC-4 SILT SOXX * BMP DETAIL BMP PICTURE Page: 7-4 1 2 3 ENVIRONMENTAL GUIDANCE Date Doc. No.EG-303NE 02/20/18 SUBJECT Access, Maintenance and Construction Best Management Practices Reference EP No. 3 - Natural Resource Protection (Chapter 6) Rev. No. 4 SEC-5 STRAW WATTLE * (1 OF 2) BMP DETAIL Page: 7-5 ENVIRONMENTAL GUIDANCE Date Doc. No.EG-303NE 02/20/18 SUBJECT Access, Maintenance and Construction Best Management Practices Reference EP No. 3 - Natural Resource Protection (Chapter 6) Rev. No. 4 SEC-5 STRAW WATTLE * (2 OF 2) BMP PICTURE Page: 7-6 ENVIRONMENTAL GUIDANCE Date Doc. No.EG-303NE 02/20/18 SUBJECT Access, Maintenance and Construction Best Management Practices Reference EP No. 3 - Natural Resource Protection (Chapter 6) Rev. No. 4 AA-20 SILT SACK * BMP DETAIL BMP PICTURE Page: 7-48