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Record of Decision System (RODS)

NORWOOD PCBS

Abstract

Site Name:  NORWOOD PCBS
Address:  NEAR RTE 1 & DEAN STREET 
City & State:  NORWOOD  MA  02062
County:  NORFOLK
 
EPA ID:  MAD980670566
EPA Region:  01
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R01-89/043
ROD Date:  09/29/1989
Operable Unit(s):  01
 
Media:  VOCS PCE TCE PAHS PCBS PHENOLS
 
Contaminant:  SOIL, SEDIMENT, GROUNDWATER
 
Abstract:  THE 26-ACRE NORWOOD PCBS SITE CONSISTS OF SEVERAL INDUSTRIAL AND COMMERCIAL PROPERTIES, PARKING AREAS, AND VACANT LOTS IN NORWOOD, NORFOLK COUNTY, MASSACHUSETTS. SIGNIFICANT SITE FEATURES INCLUDE THE GRANT GEAR PROPERTY TO THE NORTH, AN OFFICE PARK COMPLEX WHICH EXTENDS ALONG THE WESTERN PORTION OF THE SITE, AND RESIDENTIAL AREAS WHICH BORDER THE SITE TO THE WEST AND NORTH. MEADOW BROOK, WHICH DISCHARGES TO THE NEPONSET RIVER, AND AN ASSOCIATED WOODED WETLANDS AREA MAKE UP THE NORTH SITE BOUNDARY. FOUR PILES OF SEDIMENT SLUDGE, PREVIOUSLY DREDGED FROM THE STREAM, ARE LOCATED ON THE SOUTH BANK OF THE BROOK. SITE CONTAMINATION ORIGINATED FROM DISPOSAL PRACTICES OF PREVIOUS BUSINESSES, PRIMARILY ELECTRICAL EQUIPMENT MANUFACTURING, THAT OPERATED FROM THE BUILDING NOW OWNED BY GRANT GEAR REALTY TRUST. IN APRIL 1983 THE STATE RESPONDED TO A CITIZEN REPORT OF PREVIOUS INDUSTRIAL WASTE DUMPING AT THE SITE AND TOOK SURFICIAL SOIL AND SEDIMENT SAMPLES WHICH CONFIRMED PCB CONTAMINATION. IN JUNE 1983 EPA REMOVED 500 TONS OF PCB- CONTAMINATED SOIL FROM THE OFFICE PARK COMPLEX AND GRANT GEAR PROPERTIES AND DISPOSED OF IT OFFSITE. THE STATE IMPLEMENTED AN INTERIM REMEDIAL MEASURE IN 1986 TO LIMIT ACCESS TO AREAS WITH HIGH SURFACE CONTAMINATION ON THE GRANT GEAR PROPERTY BY CONSTRUCTING A 1.5-ACRE CAP. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING SOIL, SEDIMENT, GROUND WATER, AND BUILDING SURFACES ARE VOCS INCLUDING TCE AND PCE; OTHER ORGANICS INCLUDING PCBS, PAHS, AND PHENOLS; AND METALS.

THE SELECTED SOURCE CONTROL REMEDIAL MEASURES INCLUDE EXCAVATION, SOLVENT EXTRACTION, AND ONSITE DISPOSAL OF APPROXIMATELY 31,000 CUBIC YARDS OF UNSATURATED SOIL AND DREDGE PILE SEDIMENT AND APPROXIMATELY 3,000 CUBIC YARDS OF MEADOW BROOK SEDIMENT FOLLOWED BY INSTALLING A SOIL COVER OVER THE TREATED SOIL; OFFSITE INCINERATION AND DISPOSAL OF EXTRACTED OILS CONTAINING PCBS; FLUSHING AND CLEANSING PORTIONS OF THE GRANT GEAR DRAINAGE SYSTEM; CLEANING AND SEALING ROOF SURFACES, AND DECONTAMINATING MACHINERY, EQUIPMENT, AND FLOOR SURFACES IN THE GRANT GEAR BUILDING WHICH EXCEED TSCA CLEANUP LEVELS; GROUND WATER COLLECTION IN A BARRIER DRAIN TRENCH WITH ONSITE TREATMENT BY CARBON ADSORPTION FOR PCBS, AIR STRIPPING FOR VOCS REMOVAL, AND PRECIPITATION/FILTRATION FOR METALS REMOVAL; WETLANDS RESTORATION; LONG TERM ENVIRONMENTAL MONITORING OF GROUND WATER, SOIL, SEDIMENT AND BUILDING SURFACES; AND INSTITUTIONAL CONTROLS RESTRICTING GROUND WATER AND LAND USE. THE ESTIMATED PRESENT WORTH COST FOR THIS SELECTED REMEDY IS $16,100,000, WHICH INCLUDES ANNUAL O&M COSTS FOR UP TO 10 YEARS.
 
Remedy:  THE SELECTED REMEDIAL ACTION FOR THE NORWOOD PCB SITE CONSISTS OF SOURCE CONTROL AND MANAGEMENT OF MIGRATION COMPONENTS. SOURCE CONTROL REMEDIAL MEASURES INCLUDE;
* EXCAVATION, TREATMENT BY SOLVENT EXTRACTION AND ON-SITE DISPOSAL OF APPROXIMATELY 28,500 CUBIC YARDS OF SOILS, DREDGE PILE MATERIALS AND MEADOW BROOK SEDIMENTS CONTAMINATED AT LEVELS EXCEEDING SPECIFIED SOIL AND SEDIMENT CLEANUP GOALS. OFF-SITE INCINERATION OF THE OIL EXTRACT FROM THE SOLVENT EXTRACTION PROCESS. A SOIL COVER WILL BE PLACED OVER THE DISPOSAL AREAS FOR TREATED SOILS. ON-SITE INCINERATION IS THE CONTINGENCY REMEDY FOR THE TREATMENT OF SOILS AND SEDIMENTS;
* FLUSHING AND CLEANING OF THE GRANT GEAR ROOF SURFACES AND DRAINAGE SYSTEM. TO THE EXTENT THAT THIS ACTIVITY WILL NOT SATISFY SPECIFIED ACTION LEVELS, THE ROOF WILL BE ENCAPSULATED AND THE DRAINAGE SYSTEM CONTAINED, AND REPLACED.
* DECONTAMINATION BY SOLVENT WASHING OF EQUIPMENT, MACHINERY AND FLOOR SURFACES WITHIN THE GRANT GEAR BUILDING.

THE MANAGEMENT OF MIGRATION MEASURES INCLUDE;
* BARRIER DRAIN TRENCH TO COLLECT CONTAMINATED ON-SITE OVERBURDEN AND SHALLOW BEDROCK GROUNDWATER. AN EXTRACTION SYSTEM CONSISTING CONCEPTUALLY OF NINE SHALLOW EXTRACTION WELLS IS THE CONTINGENCY REMEDY; AND
* GROUNDWATER TREATMENT CONSISTING OF CARBON ADSORPTION FOR PCBS REMOVAL, AIR STRIPPING FOR VOCS REMOVAL AND PRECIPITATION FILTRATION FOR METALS REMOVAL; GROUNDWATER TREATMENT WILL CONTINUE UNTIL SPECIFIED GROUNDWATER CLEANUP LEVELS ARE ACHIEVED.

ADDITIONAL MEASURES INCLUDE;
* WETLAND RESTORATION/ENHANCEMENT OF ON-SITE WETLAND AREAS ADVERSELY IMPACTED BY REMEDIAL ACTION AND ANCILLARY ACTIVITIES;
* LONG-TERM ENVIRONMENTAL MONITORING OF ON-SITE GROUNDWATER, SOILS, SEDIMENTS AND SURFACES WITHIN THE GRANT GEAR BUILDING; AND
* INSTITUTIONAL CONTROLS TO PREVENT THE USE OF GROUNDWATER IN THE ZONE OF CONTAMINATION AS A DRINKING WATER SOURCE AND TO PREVENT DISTURBANCE OF CONTAMINATED UNTREATED SUBSURFACE SOILS WITHIN THE GRANT GEAR PROPERTY, SEDIMENTS WITHIN THE GRANT GEAR DRAINAGE SYSTEM AND SOILS UNDER PAVEMENT IN AREAS OUTSIDE GRANT GEAR.
* THE ESTIMATED PRESENT WORTH COST FOR THE SELECTED REMEDY, INCLUDING BOTH SOURCE CONTROL AND MANAGEMENT OF MIGRATION IS $16,100,000. THE ESTIMATE INCLUDES CAPITAL COSTS AS WELL AS CONSTRUCTION AND OPERATION AND MAINTENANCE COSTS.
 
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