Transportation « Energy Land Development

803 Summer Street Boston, MA 02127 Sent Via Email Tel: 617-896-4300 October 22, 2020 www.bscgroup.com Christian Klein, Chair Arlington Zoning Board of Appeals 51 Grove Street Arlington, MA 02476

RE: Thorndike Place Wetland Delineation

Chairman Klein:

In response to comments provided by the Arlington Conservation Commission and BETA Group, BSC Group wetland scientists have conducted a site visit on October 15, 2020 to re- evaluate the wetland delineation initially completed in January 2020. With the initial delineation completed in winter conditions, a few wetland flags were adjusted based on growing season conditions. The following information is included as attachments to this letter:

e Wetland Delineation Memorandum dated October 19, 2020 e MassDEP Bordering Vegetated Wetland Delineation Field Data Forms (5) e Existing Environmental Resources Plan revised October 22, 2020

This information is also being transmitted electronically to the Conservation Commission and BETA Group. We also want to extend our offer to walk the site with BETA Group when the review the delineation. Please me call at 781-710-7280 or email me at jhession@bscgroup.com if you have any questions or require additional information.

Very truly yours, BSC Group, Inc.

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John Hession, P.E. cavincers Director of Land Development Environmental cc: zba@town.arlington.ma.us Scientists Richard Vallarelli, ZBA

Emily Sullivan, Conservation Custom Software

Susan Chapnick, Conservation Commission Developers Jenny Raitt, Planning and Community Development Landscape

Marta Nover and Todd Undzis, BETA Architects

Stephanie Kiefer, Smolak & Vaughan

Gwen Noyes and Arthur Klipfel, Arlington Land Realty Planners