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Record of Decision System (RODS)

DELAWARE SAND & GRAVEL LANDFILL

Abstract

Site Name:  DELAWARE SAND & GRAVEL LANDFILL
Address:  229 GRANTHAM LANE 
City & State:  NEW CASTLE  DE  19720
County:  NEW CASTLE
 
EPA ID:  DED000605972
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-88/048
ROD Date:  04/22/1988
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  METALS, ORGANICS, VOCS
 
Abstract:  THE DELAWARE SAND & GRAVEL (DS&G) SITE IS A 27-ACRE INACTIVE INDUSTRIAL WASTE LANDFILL LOCATED IN NEW CASTLE COUNTY, DELAWARE. IT IS BORDERED BY ARMY CREEK TO THE WEST, ARMY CREEK AND WETLANDS TO THE NORTH, RESIDENTIAL AND BUSINESS FACILITIES TO THE EAST, AND AN ABANDONED SAND AND GRAVEL QUARRY TO THE SOUTH. ALSO TO THE WEST DIRECTLY ACROSS ARMY CREEK IS THE ARMY CREEK LANDFILL NPL SITE. RESIDENCES ARE LOCATED APPROXIMATELY 30 FEET FROM THE LANDFILL AND A RESIDENTIAL DEVELOPMENT IS LOCATED APPROXIMATELY 0.5 MILES SOUTH AND SOUTHWEST OF THE SITE. UNDERLYING THE LANDFILL IS THE POTOMAC AQUIFER, WHICH IS ACCESSED ABOUT 1.25 MILES SOUTH OF THE SITE AND USED AS A PUBLIC WATER SOURCE. THE DS&G SITE CONSISTS OF FOUR DISPOSAL AREAS, REFERRED TO AS THE DRUM DISPOSAL, INERT DISPOSAL, RIDGE, AND GRANTHAM SOUTH AREAS. BETWEEN 1968 AND 1976 THE SITE ACCEPTED HOUSEHOLD AND CONSTRUCTION WASTES AND APPROXIMATELY 7,000 DRUMS CONTAINING LIQUIDS AND SLUDGES FROM PERFUME, PLASTICS, PAINT, AND PETROLEUM REFINING PROCESSES. IN 1971, INVESTIGATIONS REVEALED GROUND WATER CONTAMINATION EMANATING FROM THE ARMY CREEK AND DS&G LANDFILLS. IN 1976, THE DELAWARE DEPARTMENT OF NATURAL RESOURCES AND ENVIRONMENTAL CONTROL ISSUED AN ENFORCEMENT ACTION REQUIRING DS&G TO DISCONTINUE DISPOSAL ACTIVITIES. A GROUND WATER RECOVERY SYSTEM WAS INSTALLED TO PREVENT CONTAMINATED WATER FROM REACHING THE NEARBY PRIVATE WELLFIELD, WHICH CONTINUES TO OPERATE. INVESTIGATIONS WERE CONDUCTED TO CHARACTERIZE THE SOURCE AND EXTENT OF CONTAMINATION FROM BOTH SITES, AND IN 1984 EPA INITIATED AN EMERGENCY REMOVAL ACTION AT THE DS&G SITE TO REMOVE APPROXIMATELY 600 DRUMS FROM THE DRUM DISPOSAL AREA. AN ESTIMATED 535,000 CUBIC YARDS OF WASTE MATERIAL ARE LOCATED ONSITE. WASTES IDENTIFIED IN THE DRUM DISPOSAL AREA INCLUDE SUBSURFACE SOIL AND DEBRIS CONTAMINATED WITH PCBS, ORGANIC LIQUIDS, AND INORGANIC SOLIDS. THE DRUM DISPOSAL AREA IS BELIEVED TO BE THE MAJOR SOURCE OF ORGANIC GROUND WATER CONTAMINATION. THE RIDGE AREA CONSISTS OF CONTAMINATED SURFICIAL SOIL, AND DRUMS, STORAGE TANKS AND DEBRIS SCATTERED ON THE SURFACE. THE INERT DISPOSAL AREA CONTAINS VARIOUS DOMESTIC WASTE, CARS, TRUCKS AND STORAGE TANKS SCATTERED ON THE SURFACE. THE GRANTHAM SOUTH AREA IS BELIEVED TO CONTAIN SURFICIAL INERT WASTE AS WELL AS DEPOSITED CHEMICAL WASTES. TWO HOT SPOTS OR ORGANIC CONTAMINATION WERE IDENTIFIED IN THIS AREA. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND GROUND WATER ARE VOCS INCLUDING BENZENE, TOLUENE, AND XYLENES, OTHER ORGANICS INCLUDING PCBS, PAHS, AND PHENOLS, AND METALS INCLUDING CHROMIUM AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES: EXCAVATION AND ONSITE MOBILE INCINERATION OF APPROXIMATELY 36,000 TONS OF CONTAMINATED SOIL AND WASTES FROM THE DRUM DISPOSAL AND RIDGE AREAS, WITH ON-OR OFFSITE DISPOSAL OF RESIDUAL ASH AND GRADING AND REVEGETATION OF EXCAVATED AREAS; REMOVAL AND OFFSITE DISPOSAL OF ALL SURFACE DEBRIS MATERIAL FROM THE INERT AREA, FOLLOWED BY CAPPING; CONSTRUCTION OF A RCRA CAP OVER THE GRANTHAM SOUTH AREA; GROUND WATER PUMP AND TREATMENT WITH DISCHARGE TO ARMY CREEK; AND GROUND WATER MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $24,944,000.
 
Remedy:  THE REMEDY SELECTED ADDRESSES THE SOURCES OF CONTAMINATION BY REMEDIATION OF ON-SITE WASTES AND CONTAMINATED SOILS AS WELL AS ADDRESSING REMEDIATION OF THE GROUNDWATER CONTAMINATION PLUME.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;

* EXCAVATE WASTES AND CONTAMINATED SOIL FROM THE DRUM DISPOSAL AND RIDGE AREA AND TREAT THE WASTES AND CONTAMINATED SOIL BY ON-SITE INCINERATION TO ALLEVIATE THE DIRECT CONTACT THREAT AND LEACHATE GENERATION FROM THE MAJOR CONTAMINATION SOURCES ON THE SITE.
* CAPPING OF THE GRANTHAM SOUTH AREA IN ORDER TO ALLEVIATE DIRECT CONTACT THREAT AND POTENTIAL LEACHATE GENERATION.
* DEBRIS REMOVAL AND CAPPING THE INERT DISPOSAL AREA TO ALLEVIATE POTENTIAL DIRECT CONTACT THREAT AND TO MEET STATE OF DELAWARE SOLID WASTE REGULATIONS.
* CONTINUE RECOVERY OF CONTAMINATED GROUNDWATER TO ELIMINATE POTENTIAL GROUNDWATER INGESTION RISK.
* IMPLEMENTATION OF TREATMENT OF RECOVERED CONTAMINATED GROUNDWATER PRIOR TO DISCHARGE TO ARMY CREEK.
 
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