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Record of Decision System (RODS)

CHARLES-GEORGE RECLAMATION TRUST LANDFILL

Abstract

Site Name:  CHARLES-GEORGE RECLAMATION TRUST LANDFILL
Address:  CORNER DUNSTABLE & CUMMINGS RD 
City & State:  TYNGSBOROUGH  MA  01879
County:  MIDDLESEX
 
EPA ID:  MAD003809266
EPA Region:  01
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R01-88/029
ROD Date:  09/29/1988
Operable Unit(s):  03, 04
 
Media:  AIR GROUNDWATER SEDIMENTS
 
Contaminant:  METALS, ARSENIC, ORGANICS, PAHS, VOCS, BENZENE, TCE
 
Abstract:  THE CHARLES GEORGE LANDFILL (CGL) SITE IS LOCATED APPROXIMATELY ONE MILE SOUTHWEST OF THE TOWN OF TYNGSBOROUGH, MASSACHUSETTS. THE 70-ACRE SITE IS BOUNDED BY FLINT POND MARSH (WETLAND AREA) AND FLINT POND TO THE EAST, DUNSTABLE BROOK TO THE WEST, AND THE CANNONGATE CONDOMINIUM COMPLEX TO THE SOUTHEAST. LAND USE IN THE VICINITY OF THE SITE IS PREDOMINANTLY RURAL AND RESIDENTIAL BUT ALSO INCLUDES SOME LIGHT INDUSTRY AND SEASONAL LIVESTOCK GRAZING. THE LANDFILL CONTAINS MUNICIPAL WASTE DISPOSED OF ONSITE FROM THE MID-1950S UNTIL THE LANDFILL CLOSED IN 1983 BY ORDER OF THE MASSACHUSETTS ATTORNEY GENERAL. HAZARDOUS INDUSTRIAL WASTE WAS ALSO DISPOSED OF PRIMARILY IN THE WESTERN AREA OF THE SITE FROM 1973 UNTIL AT LEAST 1976. THE SITE CAME TO THE ATTENTION OF THE MASSACHUSETTS DEPARTMENT OF ENVIRONMENTAL QUALITY ENGINEERING (DEQE) WHEN THE DEEP BEDROCK WELLS IN USE BY THE CANNONGATE CONDOMINIUM COMPLEX BECAME CONTAMINATED WITH VOCS. THE DEQE ORDERED THE WELLS CLOSED IN 1982. EPA CONDUCTED GROUND WATER MONITORING IN 1981 AND 1982, AND ALSO UNDERTOOK EMERGENCY REMOVAL ACTIONS BEGINNING IN AUGUST 1983 AND CONTINUING THROUGH MARCH 1984. PRESENTLY THE SITE HAS A THIN SOIL COVER, 2 SURFACE WATER AND LEACHATE LAGOONS, 2 LEACHATE COLLECTION SYSTEMS, 1 RECIRCULATING PUMP STATION, AND 12 SHALLOW GAS VENTS. CONSTRUCTION OF A FULL SYNTHETIC LANDFILL CAP WAS ADDRESSED IN A PREVIOUS ROD AND SHOULD BEGIN IN EARLY 1989. THIS ROD ENCOMPASSES THE THIRD AND FOURTH OPERABLE UNITS AND FOCUSES ON THE CONTROL AND CLEANUP OF CONTAMINANTS THAT HAVE SPREAD OR ARE SPREADING FROM THE SITE, INCLUDING THE TREATMENT OF LEACHATE COLLECTED AS PART OF THE CAP SYSTEM. INVESTIGATIONS HAVE IDENTIFIED CONTAMINATED GROUND WATER IN OVERBURDEN, SHALLOW BEDROCK, AND DEEP BEDROCK ZONES. IN ADDITION, AN ESTIMATED 500 YD(3) OF SEDIMENTS REQUIRE REMEDIATION, AND VENT EMISSIONS FROM THE LANDFILL ARE CONTAMINATED WITH A WIDE ARRAY OF VOCS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER, SEDIMENTS AND AIR, ARE VOCS INCLUDING BENZENE AND TCE, ORGANICS INCLUDING PAHS, AND METALS INCLUDING ARSENIC.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES; EXTRACTION AND TREATMENT OF SHALLOW GROUND WATER PLUMES AND LEACHATE COLLECTED FROM THE LANDFILL CAP SYSTEM USING BIOLOGICAL TREATMENT, METALS PRECIPITATION AND CARBON ADSORPTION WITH ONSITE DISCHARGE OF THE TREATED WATER INTO THE AQUIFER OR OFFSITE DISCHARGE INTO NEARBY SURFACE WATER; COLLECTION AND INCINERATION OF LANDFILL VENT GAS EMISSIONS; EXCAVATION AND SOLIDIFICATION OF APPROXIMATELY 500 YD(3) OF CONTAMINATED DUNSTABLE BROOK SEDIMENTS AND PLACEMENT BENEATH THE PHASE II LANDFILL CAP; AND GROUND WATER MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $11,320,000 WHICH INCLUDES O&M COSTS OF $601,000.
 
Remedy:  THE SELECTED REMEDIES FOR THE PHASE III CLEANUP AT THE CHARLES GEORGE SITE REPRESENT THE REMAINING CLEANUP MEASURES ANTICIPATED TO BE NECESSARY. THESE PHASE III REMEDIAL ACTIONS CONSIST OF:
1. EXTRACTION OF CONTAMINATED SOUTHWESTERN AND EASTERN SHALLOW GROUNDWATER PLUMES, AND COMBINED BIOLOGICAL-BASED TREATMENT OF THE EXTRACTED GROUNDWATER WITH LEACHATE COLLECTED FROM THE LANDFILL CAP SYSTEM;
2. DEEP BEDROCK GROUNDWATER AND RESIDENTIAL WELL MONITORING;
3. COLLECTION AND INCINERATION OF LANDFILL VENT GAS EMISSIONS; AND
4. EXCAVATION AND SOLIDIFICATION OF APPROXIMATELY 500 CUBIC YARDS OF CONTAMINATED DUNSTABLE BROOK SEDIMENTS. THE SOLIDIFIED SEDIMENTS WILL BE PLACED ON THE EXISTING CHARLES GEORGE LANDFILL FOR CAPPING AS PART OF THE PHASE II, SOURCE CONTROL REMEDY FOR THE SITE.

THE ESTIMATED PRESENT WORTH COSTS FOR THESE REMEDIES, INCLUDING DESIGN, CONSTRUCTION, AND OPERATING COSTS, AND ASSUMING THIRTY YEARS FOR REMEDIATION, ARE $8,800,000, $1,301,000, $1,034,000 AND $79,000, RESPECTIVELY. THE TOTAL ESTIMATED PRESENT WORTH COST FOR THE PHASE III REMEDIES IS $11,320,000.
 
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