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Record of Decision System (RODS)

COKER'S SANITATION SERVICE LANDFILLS

Abstract

Site Name:  COKER'S SANITATION SERVICE LANDFILLS
Address:  COUNTY RTE 152 
City & State:  CHESWOLD  DE  19936
County:  KENT
 
EPA ID:  DED980704860
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-90/096
ROD Date:  09/28/1990
Operable Unit(s):  01
 
Media:  SOIL SLUDGE
 
Contaminant:  VOCS, BENZENE, METALS
 
Abstract:  THE COKER'S SANITATION SERVICE LANDFILLS SITE IS COMPRISED OF TWO INACTIVE LANDFILLS, THE 10-ACRE LANDFILL #1 AND THE 15-ACRE LANDFILL #2, LOCATED APPROXIMATELY 0.5 MILE APART FROM EACH OTHER, IN KENT COUNTY, DELAWARE. LANDFILL #1 IS BORDERED TO THE NORTH BY A FORESTED WETLAND THAT INCLUDES A SHALLOW STREAM KNOWN AS THE WILLIS BRANCH OF THE LEPISC RIVER. LAND USE IN THE AREA IS PRIMARILY AGRICULTURAL AND RESIDENTIAL. EACH LANDFILL CONTAINS APPROXIMATELY 45,000 CUBIC YARDS OF LATEX SLUDGE WASTE IN ADDITION TO THE CONTAMINATED SOIL/WASTE. FROM 1969 TO 1977, LATEX RUBBER WASTE SLUDGE WAS DISPOSED OF ON LANDFILL #1 INTO UNLINED TRENCHES, WHICH WERE TOPPED OFF WITH LOCAL SOIL WHEN NEARLY FILLED WITH SLUDGE. FROM 1976 TO 1980, LATEX SLUDGE WAS ALSO DISPOSED OF INTO LINED TRENCHES AT LANDFILL #2. THE LANDFILL OPERATING PERMIT REQUIRED A LEACHATE COLLECTION AND TREATMENT SYSTEM AND A GROUND WATER MONITORING SYSTEM TO BE INSTALLED. SUBSEQUENTLY, THE LATEX SLUDGE WASTE IN BOTH LANDFILLS GRADUALLY SETTLED AND COMPACTED REDUCING PERMEABILITY AND MINIMIZING THE AMOUNT OF LEACHATE FROM THE SITE. EXCESS LEVELS OF STYRENE AND ETHYLBENZENE WERE FOUND IN THE WASTE TRENCHES OF BOTH LANDFILLS AND IN THE LEACHATE COLLECTION SYSTEM OF LANDFILL #2. THIS RECORD OF DECISION (ROD) ADDRESSES CONTAMINATION IN BOTH LANDFILLS AND IN THE LEACHATE COLLECTION SYSTEM AT LANDFILL #2. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND SLUDGE AT THE SITE ARE VOCS INCLUDING BENZENE, AND METALS.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES COVERING THE SEEPS AT LANDFILL #1; BACKFILLING DEPRESSED AREAS OF LANDFILL #2 AND SEALING THE LANDFILL #2 LEACHATE COLLECTION SYSTEM; MONITORING GROUND AND/OR SURFACE WATER; AND IMPLEMENTING SITE ACCESS RESTRICTIONS AND INSTITUTIONAL CONTROLS INCLUDING DEED RESTRICTIONS ON LAND USE. THE ESTIMATED TOTAL COST FOR THIS REMEDIAL ACTION IS $653,000, WITH TOTAL O&M COSTS OF $527,257.

PERFORMANCE STANDARDS OR GOALS; CHEMICAL-SPECIFIC GOALS ARE NOT APPLICABLE, SINCE THIS REMEDIAL ACTION USES NO TREATMENT TECHNOLOGIES. THE REMEDIAL ACTIVITIES WILL REDUCE THE CANCER RISK LEVEL TO LESS THAN (10-6), AND THE HAZARD INDEX TO LESS THAN 1.0.
 
Remedy:  THE SELECTED REMEDY ADDRESSES THE PRINCIPAL THREATS POSED BY THE CONDITIONS AT THE SITE BY REDUCING THE POTENTIAL FOR HUMAN EXPOSURE TO WASTES REMAINING AT THE SITE. THE MAJOR COMPONENTS OF THE SELECTED REMEDY ARE AS FOLLOWS;

* DEED RESTRICTIONS WILL BE PLACED ON BOTH LANDFILL PROPERTIES.
* THE ENTIRE WASTE DISPOSAL AREAS OF BOTH LANDFILLS WILL BE ENCLOSED BY A CHAIN-LINK SECURITY FENCE WITH A LOCKED GATE TO RESTRICT THE ACCESS OF UNAUTHORIZED PERSONS AND EQUIPMENT ONTO THE LANDFILLS.
* APPROPRIATE WARNING SIGNS WILL BE PLACED ALONG THE FENCE.
* COVER MATERIAL WILL BE PLACED ALONG THE NORTHERN SLOPE OF LANDFILL #1 TO ELIMINATE EXPOSURE TO LEACHATE SEEPS.
* AREAS OF LANDFILL #2 WHICH HAVE SUBSIDED DUE TO UNEVEN SETTLING OF WASTE WILL BE BACKFILLED TO GRADE AND SEEDED.
* LEACHATE COLLECTION WELLS AT LANDFILL #2 WILL BE SEALED WITH GROUT TO REDUCE THE POTENTIAL FOR DIRECT CONTACT WITH LEACHATE.
* GROUND WATER WILL BE SAMPLED SEMI-ANNUALLY AT BOTH LANDFILLS.
* THE LANDFILLS WILL BE INSPECTED SEMI-ANNUALLY DURING GROUND WATER SAMPLING EVENTS.
* SURFACE WATER MONITORING WILL BE CONDUCTED AT THE WILLIS BRANCH ADJACENT TO LANDFILL #1 AT THE SAME TIME AS GROUND WATER MONITORING FOR A PERIOD OF NO LESS THAN FIVE YEARS.
* A SITE REVIEW WILL BE CONDUCTED AT LEAST EVERY FIVE YEARS AS REQUIRED UNDER SECTION 121(C) OF CERCLA, 42 USC S9621(C).
 
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