Site Name: CANNON ENGINEERING CORP. (CEC)
EPA ID: MAD079510780 EPA Region: 01 Metro Statistical Area: 1200
FIRST ST, BRIDGEWATER, MA 02324
Operable Unit:
ROD ID: EPA/ROD/R01-88/031 ROD Date: 03/31/88
Contaminant: ORGANICS, PAH, PCBS, VOCS, BENZENE, TCE, VINYL CHLORIDE
Keys: AERATION, ARARS, BENZENE, CLEAN AIR ACT, CLEAN WATER ACT, DEBRIS, DECONTAMINATION, DEED RESTRICTION, DIRECT CONTACT, EXCAVATION, FLOOD PLAIN, GROUND WATER, GROUND WATER MONITORING, INCINERATION, INSTITUTIONAL CONTROLS, MCLS, OFFSITE DISPOSAL, OFFSITE TREATMENT, ONSITE TREATMENT, ORGANICS, PAHS, PCBS, SOIL, RCRA, SAFE DRINKING WATER ACT, STATE CRITERIA, TCE, TOXIC SUBSTANCES CONTROL ACT, TREATMENT TECHNOLOGY, VOCS, WETLANDS
Abstract:
THE CANNON ENGINEERING CORPORATION (CEC) FACILITY IS LOCATED IN A SMALL INDUSTRIAL PARK IN THE WESTERN PART OF THE TOWN OF BRIDGEWATER, PLYMOUTH COUNTY, MASSACHUSETTS. THE FOUR-ACRE SITE IS BORDERED BY INDUSTRIAL DEVELOPMENTS TO THE NORTH AND EAST AND A WOODED LOWLAND TO THE SOUTH AND WEST. A WETLAND AREA LIES SOUTH AND WEST OF THE SITE. CEC, WHICH HAS OWNED THE PROPERTY SINCE 1974, HANDLED, STORED, AND INCINERATED CHEMICAL WASTE ONSITE FROM 1974 TO 1980. EPA CONDUCTED SITE INVESTIGATIONS BETWEEN 1980 AND 1982, AND IN OCTOBER 1982, MASSACHUSETTS CONTRACTED FOR THE REMOVAL OF SLUDGE AND LIQUID WASTE FROM ONSITE TANKS AND DRUMS. IN JANUARY 1988, EPA PROVIDED FOR THE REMOVAL AND DISPOSAL OF NUMEROUS HAZARDOUS MATERIALS ABANDONED AT THE SITE. THIS REMEDIAL ACTION ADDRESSES THREE DISCRETE AREAS OF SOIL AND SEDIMENT CONTAMINATION LOCATED IN THE NORTHWESTERN AND SOUTHERN PORTIONS OF THE SITE, AND THE BUILDINGS, TANKS, AND OTHER CONTAMINATED STRUCTURES ONSITE. THE VOLUME OF CONTAMINATED SOIL IS ESTIMATED TO BE 325 YD3. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER, SOIL, AND DEBRIS ARE VOCS INCLUDING BENZENE, TCE, AND VINYL CHLORIDE, AND OTHER ORGANICS INCLUDING PCBS AND PAHS. THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES: ACCESS RESTRICTIONS; EXCAVATION AND ONSITE TREATMENT OF VOC-CONTAMINATED SOIL BY THERMAL AERATION, AND EXCAVATION AND OFFSITE TREATMENT OF PCB-CONTAMINATED SOIL BY INCINERATION; DECONTAMINATION, REMOVAL, AND DISPOSAL OF CONTAMINATED BUILDINGS, TANKS, AND STRUCTURES; ADDITIONAL SOIL SAMPLING TO ASSESS EFFECTIVENESS; GROUND WATER MONITORING AND IMPLEMENTATION OF A WATER QUALITY MONITORING PROGRAM TO ASSESS NATURAL ATTENUATION OF CONTAMINANTS; AND INSTITUTIONAL CONTROLS TO RESTRICT ONSITE GROUND WATER USE. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS BETWEEN $3,400,000, AND $4,505,000 WITH PRESENT WORTH O&M OF $700,000.
Remedy:
THE SELECTED REMEDY FOR THE CANNONS ENGINEERING CORPORATION (CEC) SITE INCLUDES BOTH A SOURCE CONTROL AND MANAGEMENT OF MIGRATION COMPONENT TO OBTAIN A COMPREHENSIVE APPROACH FOR SITE REMEDIATION. IN SUMMARY, THE REMEDY PROVIDES FENCING THE AREA TO RESTRICT ACCESS TO SOILS, TREATING CERTAIN CONTAMINATED SOILS ON SITE BY THERMAL AERATION AND TREATING PCB CONTAMINATED SOILS OFF SITE BY INCINERATION, AND INSTALLING A GROUNDWATER MONITORING SYSTEM. IN ADDITION, BUILDINGS AND TANKS ON SITE WILL BE REMOVED AND SOILS UNDER THOSE STRUCTURES, ALONG WITH OTHER SOIL LOCATIONS, WILL BE SAMPLED. ANY CONTAMINATED SOILS REQUIRING TREATMENT BASED ON A THREAT TO HUMAN HEALTH AND THE ENVIRONMENT WILL BE TREATED BY ONE OF THE SELECTED SOIL TREATMENT TECHNOLOGIES. SOURCE CONTROL THE SOURCE CONTROL REMEDIAL MEASURES INCLUDE:
FENCING -
* A CHAIN LINK FENCE WILL BE CONSTRUCTED AROUND THE PERIMETER OF THE SITE TO RESTRICT ACCESS. WARNING SIGNS WILL BE POSTED AT 100 FOOT INTERVALS ALONG THE FENCE AND AT THE ENTRANCE GATE. THE CURRENT LOCKS ON THE BUILDING WILL BE INSPECTED TO INSURE THEIR INTEGRITY AND ANY LOCKS IN DETERIORATING CONDITION WILL BE REPLACED.
SOIL TREATMENT -
* THE VOC CONTAMINATED SOIL WILL BE EXCAVATED AND TREATED ON SITE IN A THERMAL SOIL AERATION FACILITY. PCB-CONTAMINATED SOILS WILL BE EXCAVATED AND TREATED AT AN OFF-SITE INCINERATION FACILITY.
* VOC CONTAMINATED SOIL WILL BE EXCAVATED FROM THE WET AREA, A DISCRETE AREA OF CONTAMINATION LOCATED IN THE SOUTHERN PORTION OF THE SITE. THIS AREA IS SURROUNDED BY A BERM TO THE SOUTH AND THE UPLAND AREA TO THE NORTH WITH THE WATER TABLE NEAR THE SURFACE OF THE SOIL. THE MAJORITY OF THE WET AREA IS PROPOSED FOR REMEDIATION BASED ON SAMPLING DATA, SITE TOPOGRAPHY, AND CONTAMINANT TRANSPORT CONSIDERATIONS. THE EXCAVATED SOILS WILL BE TREATED ON SITE BY THERMAL AERATION TO REDUCE LEVELS OF CONTAMINATION TO LEVELS THAT ARE PROTECTIVE.
* PCB CONTAMINATED SOIL WILL BE EXCAVATED FROM A DISCRETE PORTION OF THE WET AREA AND A DISCRETE PORTION OF THE UPLAND AREA. THESE SOILS WILL BE TREATED OFF SITE BY INCINERATION.
* IMPLEMENTATION OF THESE MEASURES WILL RESULT IN THE DISTURBANCE AND TEMPORARY LOSS OF AREAS CLASSIFIED AS WETLANDS. THE UNAVOIDABLE IMPACTS TO THESE RESOURCE AREAS WILL BE MITIGATED TO THE MAXIMUM EXTENT POSSIBLE AND FOLLOWING SUCH ACTIVITIES, A WETLAND RESTORATION PROGRAM WILL BE IMPLEMENTED.
* ADDITIONALLY, ANY SOIL THAT IS IDENTIFIED DURING IMPLEMENTATION OF THE REMEDY BY THE SOIL SAMPLING PROGRAM AND DETERMINED TO NEED REMEDIATION, BASED ON POTENTIAL RISKS POSED TO HUMAN HEALTH OR THE ENVIRONMENT, WILL BE TREATED BY ONE OF THE ABOVE MENTIONED SOIL TREATMENT TECHNOLOGIES. DECONTAMINATION AND REMOVAL OF BUILDINGS AND ASSOCIATED STRUCTURES:
* SEVERAL BUILDINGS, TANKS AND STRUCTURES WILL BE DECONTAMINATED AND REMOVED FROM THE SITE.
SAMPLING -
* FOLLOWING OR CONCURRENT WITH THE BUILDING AND STRUCTURE REMOVAL, A SAMPLING PROGRAM WILL BE IMPLEMENTED TO FULLY CHARACTERIZE THE NATURE AND DISTRIBUTION OF THE CONTAMINATION PRESENT IN THE SOIL AND IN THE VICINITY OF SITE STRUCTURES.
MANAGEMENT OF MIGRATION -
* THE MANAGEMENT OF MIGRATION PORTION OF THE REMEDY INVOLVES RESTRICTING THE USE OF GROUNDWATER AT THE SITE, INSTALLING ADDITIONAL GROUNDWATER MONITORING WELLS, AND IMPLEMENTING A WATER QUALITY MONITORING PROGRAM TO OBSERVE THE PRESENCE, DISTRIBUTION AND MIGRATION OF CONTAMINANTS, IF ANY. REMOVAL AND TREATMENT OF CONTAMINATED SOILS WILL ELIMINATE SOURCES OF FURTHER GROUNDWATER CONTAMINATION. REMEDIATION OF THE LOW LEVELS OF CONTAMINATION FOUND IN THE GROUNDWATER TO MEET DRINKING WATER STANDARDS WILL OCCUR NATURALLY OVER TIME.
COST -
* THE TOTAL PRESENT WORTH COST OF THE PREFERRED ALTERNATIVE IS ESTIMATED TO BE APPROXIMATELY 3.4 MILLION DOLLARS. THIS ESTIMATE INCLUDES THE CAPITAL COST OF THE FENCING, SAMPLING, AND THE SOIL TREATMENT OF APPROXIMATELY 2.7 MILLION DOLLARS AND THE PRESENT WORTH COST OF THE WATER QUALITY MONITORING SYSTEM OF APPROXIMATELY 0.7 MILLION DOLLARS.