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PUBLIC NOTICE: Brownfields Remedial Action Plan

Public Notice of
Brownfields Remedial Action Plan
Former Synergy Site
Lower Cul-de-Sac Place, Claremont, New Hampshire

The New Hampshire Department of Environmental Services (NHDES) has received a Removal Action Work Plan and a Removal Action Work Plan - Response to Comments (collectively referred to as the Remedial Action Plan (“RAP”)) for the Former Synergy Site located at Lower Cul-de-Sac Place, adjacent to the Sugar River, in Claremont, New Hampshire.  These documents were prepared as a requirement of the state’s Brownfields Covenant Program (RSA 147-F).

The Former Synergy site was also known as the Claremont Former Manufactured Gas Plant (MGP).  According to consultant reports, the Claremont MGP was built in 1859 to provide illuminating gas for the Monadnock Mills complex.    Gas manufacturing operations ceased in the mid to late 1940’s and the plant was converted for natural gas storage and distribution.  

Previous environmental investigations identified soils on the site and sediment in the Sugar River that were impacted with MGP residual byproducts primarily in the form of coal tar.  MGP-related constituents associated with coal tar include benzene, ethylbenzene, toluene and xylene (BTEX), and several polycyclic aromatic hydrocarbons (PAHs).  The RAP that is the subject of this Notice includes the following remedial activities:1) demolition of site structures; 2) the removal of soil containing coal tar; 3) removal of sediment in a portion of the Sugar River containing coal tar; 4) in-situ stabilization of soils in the former tail race; 5) the recordation of Activity and Use Restrictions (AURs) to prevent future exposure to impacted soil remaining on the property; and 6) long-term groundwater monitoring pursuant to a groundwater management permit.  To date, all of these activities have been implemented with the exception of recording the AURs.  Groundwater monitoring was initiated in 2017 and will continue in accordance with Groundwater Management Permit GWP-199601023-C-001.

The RAP documents can be accessed on the DES OneStop Data and Information website using the following two links:

The RAP can also be viewed in person at the City of Claremont, Department of Planning and Development, 14 North Street, Claremont, New Hampshire.

Questions or comments concerning the RAP should be directed to Mr. Michael McCluskey, P.E., Department of Environmental Services, Waste Management Division, 29 Hazen Drive, Concord, New Hampshire 03302-0095; Tel. No. (603) 271-2183; Fax (603) 271-2181; E-mail: michael.mccluskey@des.nh.gov.  The comment period will end January 3, 2019.