A former SDMP site transferred to
Following decontamination and close out surveys by the Engelhard, and confirmed by the AEC, in 1963, the licenses were terminated. From the early 1960's until facility closure in 1993, operations consisted of non-nuclear metal fabrication and finishing, using mostly silver and gold, resulting in waste generation (and soil contamination) that include: PCB's, cyanide, chromium, and acid/alkaline waste streams, solvents, pollution control dust, and metal hydroxide sludge. A smaller metal finishing business is currently operating at the site. In March 1986, EPA issued a RCRA 3007 letter to Engelhard requesting information about the Solid Waste Management Units (SWMUs) and releases of hazardous constituents to the environment. Engelhard responded in September 1986. Starting in 1987, as result of the RCRA 3007 letter, Engelhard voluntarily conducted three phases of environmental investigations to assess the impacts to the soil, surface water, groundwater, etc. from the release of the hazardous constituents to the environment. Some mitigating implementations include demolishing several on-site buildings, installation and operation of a 50 gallon/minute groundwater pump and treat system, and purchase and demolition of several private homes. In 1991, EPA prepared an RFA for the site which included a review of the state and local files, EPA Region 1 files, the 3007 letter response, and visual site inspections conducted on May 26, 1998 and March 25, 1991. In 1993, Engelhard and EPA signed a 3008(h) consent order to perform an RCRA Facility Investigation (RFI) and risk assessments, and implementation or four stabilization measures. The only outstanding stabilization measure is the removal, treatment, and/or capping of contaminated soils in the south side of the building - known as Area of Concern B (AOC B). In 1997, Engelhard submitted to EPA a Conceptual Design for the stabilization of contaminated soils in AOC B, which proposes to encapsulate - into an engineered cell - the low level metal and PCB-containing soils from AOC B and 7 into the AOC 7 (courtyard) area of the site. EPA accepted the Conceptual Design on September 30, 1997, and required the Final Design for AOC B/7 soils to now address RCRA, RSCA, and radiological soils in an integrated design approach. In 1998, the Massachusetts Radiation Control Program (MRCP) conditionally accepted the engineered cell concept. The condition of acceptance was that Engelhard demonstrate that groundwater either flowing off-site, or collected treated and discharged into adjoining
1. Site Identification
License No.: None
Docket No.: 070-00139 (old)
License Status: Terminated in 1962
Project Manager: J. Parrott
2. Site and Operations
A subsidiary of Engelhard Corporation called D.E. Makepeace was licensed by the AEC to use enriched
uranium for the fabrication of fuel elements from the late 1950's to the early 1960's. During this period, the
licensee was allowed to discharge uranium contaminated effluent to an onsite septic system and to incinerate
uranium contaminated solid waste on site. At license termination, only indoor areas were surveyed for release.
The outdoor contamination was not discovered until the site became subject to characterization for the
presence of hazardous wastes on site under RCRA. Because the contamination was from special nuclear
material, and.therefore not subject to regulation by RCRA, the EPA contacted the NRC in late 1991.
The site is currently operating but does not use licensable material. The majority of the approximately 10
hectare (25 acre) site is covered by buildings and parking lots. This site is adjacent to a small reservoir called
Turnpike Lake. Engelhard is in the process of shutting down this facility.
3. Radioactive Wastes
Very little data exists on the radioactive wastes at this site. Agamma survey was done by Engelhard in 1988on
the buildings that existed at the time that licensed activities took place, and also around the septic system and
pump house. Inside the buildings, maximum readings of 1.8x 1.8E-8 to 2.1E-8 C/kg (70 to 80 _R)/hr were found
in isolated areas. Sludge inside the unused septic tank also was found to be contaminated. Unverified preliminary
sampling in the area of the old septic system have yielded gross alpha values as high as 2.4 Bq (66 pCi)/g in
the soil and 48 Bq (1300 pCi)/l in the ground water. Areas of the site also are contaminated with heavy metals
and organic solvents, so the potential exists for mixed wastes.
4. Description of Radiological Hazard
Access is not controlled to indoor areas suspected of being radiologically contaminated. However, this contamination
is fixed and should be no hazard to plant workers.The suspected outdoor contaminated areas are under
pavement. Access to the old septic tank is possible through a manhole in the parking lot. The radiological
contamination detected so far is confined to the site. non-radiological hazardous waste has been detected in
onsite soil and in ground water and offsite ground water.
5. Financial Assurance/Viable Responsible Organization
Because no license exists for this site, compliance with financial assurance regulations does not apply. Engelhard
appears to be a financially viable company and seems willing to properly decommission this site. Engelhard
has received an administrative order from the EPA Region I RCRA office to characterize and remediate the
hazardous contamination associated with this site.
6. Status of Decommissioning Activities
On November 10, 1992,NRC staff participated in a public meeting in Plainville involving representatives of
EPA Region I, the Massachusetts Department of Environmental Protection (DEP), and Engelhard Corporation.
This meeting was held in conjunction with the release of the Public Involvement Plan prepared jointly by
DEP and EPA. The Public Involvement Plan is applied to sites as designated by DEP in response to community
interest in becoming involved in the remediation process.
NRC sent a letter to Engelhard on November 23, 1992, requesting that all samples taken for RCRA site
characterization be analyzed for gross alpha and gross beta, or isotopic uranium in areas where elevated gross
alpha readings have already been found. This letter also outlined the residual contamination criteria that
should be applied to the site soil as 1.113q(30pCi)/I total uranium,and 1.1Bq (30pCi)/I total uraniuminground
Engelhard is currently negotiating with EPA on the specifics of site characterization/remediation under the
RCRA order. So that the characterization/remediation of this site goes as efficiently as possible, NRC is
requesting that Engelhard combine its RCRA site characterization efforts with the site characterization
requested byNRC. However, if the EPARCRAorder processbecomes unreasonablydelayed in the negotiating
phase, NRC will require Engelhard to act independently on the NRC request.
Engelhard submitted a decommissioning plan for the building contamination on April 21, 1993.
7. Other Involved Parties
The EPARegion IRCRA office and Massachusetts DEP are involved at this site because of the hazardous waste
8. NRC/Licensee Actions and Schedule
• NRC approves building interior decommissioning plan May 1993
• Engelhard submits radiological site characterization plan concurrent October 1993
with RCRA site characterization plan
• NRC approves site characterization plan December 1993
• Engelhard submits site characterization data and decommissioning plan June 1994
• NRC apl_roves decommissioning plan September 1994
• Engeihard completes decommissioning, submits December 1994
verification survey data
• NRC performs confirmatory survey March 1995
• NRC releases site fl_r unrestricted use August 1995
Possibility for mixed waste at this site.