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Waste Site Cleanup & Reuse in New England
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 Bridgewater,  Massachusetts
 Bristol County, Plymouth County
 Street Address: First Street
 Zip Code: 02324

 EPA ID #: MAD079510780
 Site ID #: 0100585
 Site Aliases: Cannons Engineering Bridgewater, Superfund Site, Cannon Engineering Corporation (CEC)

 Site Responsibility: Federal, State, Potentially Responsible Parties

 Proposed Date 12/30/1982
 Final Date 09/08/1983

Site Description
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The Cannon Engineering Corporation (Bridgewater) site is situated on approximately 6 acres of land that is located between Route 24 and First Street in Bridgewater, Massachusetts. In 1974, Cannon developed the site to transport, store, and incinerate hazardous wastes. On-site structures included 21 storage tanks, three buildings, an office/warehouse and an incinerator. The operation was licensed in 1979 to store used motor oils and emulsions, solvents, lacquers, organic and inorganic chemicals, plating waste, clay and filter media containing chemicals, plating sludge solids, and pesticides. The facility had a license to operate from 1974 until 1980, when alleged waste mishandling and reporting violations prompted the Massachusetts Executive Office of Environmental Affairs to revoke their license. The facility was placed in receivership when its owners were found to be guilty of illegal storage and disposal. Operations ceased at the site in 1980; leaving behind approximately 700 drums and 155,000 gallons of hazardous liquid waste and sludge in bulk storage. The on-site soils, sediments, buildings, groundwater, and surface waters were contaminated with volatile organic compounds (VOC), polychlorinated biphenyls (PCB), polycyclic aromatic hydrocarbons (PAH), pesticides, and metals to varying degrees. The Cannon Bridgewater site is associated with three other Superfund sites: Tinkham Garage, Sylvester, and Cannon Engineering Plymouth Harbor. According to data from the 2010 U.S. Census, approximately 26,563 people live within the Town of Bridgewater. The land use surrounding the former Cannon Engineering Corporation site is mostly light industrial with some residential areas. The nearest residence is located 1/8 of a mile from the site. There are 13 homes within a 1-mile radius that depend on well water. The closest municipal drinking water well is located in Raynham, 1 mile from the site. The Bridgewater municipal Town wells are located 3 miles east of the site.

Threats and Contaminants
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Prior to remediation activities, the on-site air contained trace amounts of (VOC) including benzene and methylene chloride. Groundwater beneath the site also contained (VOC) including toluene, as well as heavy metals. Soil and sediments contained PAH, PCB, dioxin, and pesticides in addition to (VOC) and heavy metals. The surface water was polluted with heavy metals including high levels of iron, selenium, lead, manganese, and silver. Direct contact and accidental ingestion of contaminated materials would have posed a potential human health threat. Inhalation of (VOC) and contaminated fugitive dust were also potential health threats. Sensitive ecological areas are located near the site and include wetland areas to the south and Lake Nippenicket to the west.

Cleanup Approach
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The source control portion of the cleanup required fencing the entire Site to restrict access and direct exposure to contaminants during on-site cleanup and demolition activities. Cleanup actions included the on-site thermal aeration, (also known as thermal desorption) of upland area and wet area soils that were contaminated with volatile organic compounds (VOC), to protective cleanup levels after additional sampling activities and after off-site incineration of polychlorinated biphenyls (PCB) contaminated soils in excess of 9 parts per million (ppm).

The management of migration portion of the clean up included restricting the use of groundwater at the site by the use of a deed restriction/institutional controls, installing additional monitoring wells, and implementing a long term groundwater quality monitoring program to observe the presence, distribution and migration of contaminants, if any. The ROD stated that removal and treatment of contaminated soils would eliminate sources of further groundwater contamination and that the remediation of the low levels of contamination found in the groundwater will meet drinking water standards through monitored natural attenuation over 20 years.

Response Action Status
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Initial Action In 1982, the Massachusetts Department of Environmental Protection (MassDep) removed 155,000 gallons of sludge and liquid wastes and approximately 700 drums and incinerated these materials off-site. In 1988, the EPA and the parties potentially responsible for site contamination removed and disposed of numerous hazardous materials that were abandoned at the site.

Entire Site The final remedy for the site was selected in 1988 and involved two cleanup phases: source control and restricting the migration of contaminants. Source control remedies included: fencing the area to restrict unauthorized access to contaminated soils that posed an unacceptable risk, treating certain contaminated soil on-site by heating to remove contaminants, burning PCB-contaminated soils off-site, installing a groundwater monitoring system, decontaminating and removing buildings and associated structures and tanks, sampling and treating other soils as necessary, and restoring wetlands that were disturbed during site cleanup. Key features of the migration control remedy included restricting the use of groundwater at the site through a deed restriction/institutional controls and installing additional groundwater monitoring wells to evaluate the movement of related contaminants. In 1990, under EPA and State oversight, cleanup activities were undertaken by the parties potentially responsible for site contamination. Four hundred tons of PCB-contaminated soil were incinerated off site; 11,330 tons of soils containing VOC's were treated on site; 1,200 tons of steel and 1,300 tons of concrete were shipped for recycling; 360 cubic yards of hazardous debris were sent to a federally-approved disposal facility; and 480 cubic yards of non-hazardous debris were shipped to a demolition materials landfill. These cleanup activities were completed in 1991 and the testing of debris from the demolished incinerator for dioxin and subsequent removal was also completed in 1991. The incinerator was shipped off site to an approved EPA-regulated disposal facility. Once the contaminated soil/source was removed, the groundwater began to cleanse itself through monitored natural attenuation. Long-term groundwater sampling and monitoring began in 1991 and continues. In September of 2008, year 18 of 20 of the long term sampling and monitoring was completed. Results indicate that groundwater leaving the site does not exceed Maximum Contaminant Levels (i.e., a federal drinking water standard). A Five Year Review of the clean up actions was completed in 1995, 2000, 2005 and 2010. Five Year Reviews are required under Superfund law to ensure that the clean up actions that were selected, continue to remain protective of human health and the environment. The 1995, 2000, 2005 and 2010 Five Year Reviews determined that all of the clean up actions provide an acceptable degree of protectiveness and therefore the clean up actions taken at the site remain protective of human health and the environment. The next Five Year Review will be completed in 2015. In 1996, a portion of the site was redeveloped for use by Osterman Propane Inc. for the storage and distribution of propane. Osterman Propane was previously located in downtown Bridgewater and the need for relocation came about as a result of the development of the Old Colony Railroad project. The Cannons site was determined to be suitable for this type of land use. A second lot of land, which is also part of the Superfund site, had a cellular communications tower constructed on it in 1998.

Enforcement HighlightsA 1989 Consent Decree required the potentially responsible parties to design the remedies and perform cleanup actions at the site.

Environmental Progress
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Construction of all cleanup remedies has been completed and only site groundwater contains contamination above the Maximum Contaminant Levels (MCLs). Cleanup activities have resulted in the removal of contaminated materials from the site, thereby greatly reducing the risk of exposure to hazardous substances at the former Cannon Engineering Corporation site. Cleanup activities have also reduced and limited the movement of contaminants off site. The long-term monitoring and evaluation of the groundwater will continue until groundwater cleanup goals (MCLs) have been met. As of September of 2010, the Responsible Parties performed and completed the 20th year of the the Long Term Monitoring Program.

Samples results indicate that all VOCs have met their respective MCLs. However, 7 out of 24 groundwater sample results did exceed the MCL for arsenic. The arsenic exceedences are isolated and confined to the site boundaries. It is likely that the arsenic exceedances are indicative of a reducing environment associated with chlorinated organics contamination. It is anticipated that the arsenic will become adsorbed and/or precipitate as the aquifer gradually returns to a more oxidized state, now that VOC concentrations have met MCLs. The 2010 Five Year Review recommended an additional round of groundwater sampling (for arsenic) be conducted prior to the next Five Year Review (2015).

The first, second, third and fourth Five Year Remedy Reviews of the clean up actions were completed in 1995, 2000, 2005 and 2010, respectively. All of the Reviews determined that the past clean up actions still remain protective of human health and the environment. The next Five Year Review is scheduled to be completed in 2015.

Current Site Status
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In 2001, a Notice of Violation (of the Consent Decree) was sent to the property owner and a lessee of the other parcel that makes up the Superfund site, concerning violations of the institutional controls by the construction of a cellular telecommunication tower. As of September 2010, the potentially responsible parties completed the 20th year of the long term groundwater sampling at the site. In October 2012, the Massachusetts Department of Environmental Protection (MassDEP) completed a new groundwater use and value determination, specific to the Cannons Engineering site. MassDEP determined that the groundwater beneath the site is no longer considered potable for drinking water because the groundwater at the site is no longer considered a drinking water aquifer. Therefore the requirement to reach MCLs is no longer applicable nor relevant. Furthermore, in 2013, a site specific cumulative risk assessment was performed using the last three year of sampling data from 2008, 2009 and 2010. The results of this assessment determined that potential risks for both human health and the environment were all well within EPA’s acceptable risk range. Therefore in 2013, EPA with concurrence from MassDEP, delisted the site from the National Priorities List (NPL). The next (fifth) Five Year Remedy Review is scheduled to be completed by the end of September of 2015.

Site Photos
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SDMS 507219

SDMS 507220

Links to Other Site Information
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Disclaimer Instructions about PDF

Newsletters & Press Releases:
Press Releases about this project (if any)  

Federal Register Notices:
Final NPL Listing  
Final NPL Deletion  

Administrative Records:
Index only: Record of Decision (ROD), March 31, 1988 (696 KB)  
Index only: Explanation of Significant Differences (ESD), June 5, 2013 (580 KB)  

Reports and Studies:
Five Year Review Report, June 29, 1995 (2205KB)  
Second Five Year Review Report, September 28, 2000 (1367KB)  
Site Reuse Profile, August 2005 (122 KB)  
Third Five Year Review Report, September 23, 2005 (6.7 MB)  
Fourth Five Year Review Report, September 22, 2010 (5.04 MB)  
Final Close Out Report (FCOR), June 13, 2013 (589 KB)  
Fifth Five Year Review Report, September 22, 2015  

Decision Documents:
View Records of Decision (RODS) on-line (EPA HQ)  
Institutional Controls at this Site  

Other Links:
NPL Site Narrative at Listing:  
Site Progress Profile  
Federal Register Notice of Deletion (NOD) from the National Priorities List (NPL), July 26, 2013 (91.5 KB)  
Federal Register Notice of Intent to Delete (NOID), July 26, 2013 (69.1 KB)  

Site Repositories
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Bridgewater Public Library, 15 South Street, Bridgewater, MA 02324

OSRR Records and Information Center, 1st Floor, 5 Post Office Square, Suite 100 (HSC), Boston, MA 02109-3912 (617) 918-1440

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EPA Remedial Project Manager: Derrick Golden
Address: US Environmental Protection Agency
5 Post Office Square, Suite 100
Mail Code OSRR07-4
Boston, MA 02109-1367
Phone #: 617-918-1448
E-Mail Address: golden.derrick@epa.gov

EPA Community Involvement Coordinator: Rudy Brown
Address: US Environmental Protection Agency
5 Post Office Square, Suite 100
Mail Code ORA01-1
Boston, MA 02109-1367
Phone #: 618-918-1031
E-Mail Address: brown.rudy@epa.gov

State Agency Contact: Jay Naparstek
Address: Massachusetts Department of Environmental Protection
One Winter Street
Boston, MA 02108
Phone #: 617-292-5697
E-Mail Address: jay.naparstek@state.ma.us


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Last updated on Tuesday, November 3rd, 2015
URL: http://www.epa.gov/region1/superfund/sites/cannon