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Record of Decision System (RODS)

WILDCAT LANDFILL

Abstract

Site Name:  WILDCAT LANDFILL
Address:  LEBANON RD 
City & State:  DOVER  DE  19901
County:  KENT
 
EPA ID:  DED980704951
EPA Region:  03
 
NPL Status:  Deleted from the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-88/052
ROD Date:  06/29/1988
Operable Unit(s):  01
 
Media:  GROUNDWATER SOIL
 
Contaminant:  METALS, ARSENIC, LEAD, ORGANICS, PCBS, VOCS, BENZENE
 
Abstract:  THE WILDCAT LANDFILL SITE IS LOCATED 2.5 MILES SOUTHEAST OF DOVER IN KENT COUNTY, DELAWARE. THE 44-ACRE SITE IS BORDERED TO THE NORTH AND EAST BY THE ST. JONES RIVER AND ITS ASSOCIATED WETLANDS, AND TO THE SOUTH AND WEST BY RESIDENTIAL AND COMMERCIAL DEVELOPMENT. A POND, CREATED BY CONSTRUCTION OF THE LANDFILL, IS LOCATED DIRECTLY ADJACENT TO THE SITE ALONG THE NORTHWESTERN EDGE. THE POND IS THE SUBJECT OF A SECOND OPERABLE UNIT FOR THE SITE. PORTIONS OF THE SITE LIE WITHIN THE 100-YEAR FLOODPLAIN OF THE ST. JONES RIVER. THE SITE WAS OPERATED AS A PERMITTED SANITARY LANDFILL BETWEEN 1962 AND 1973, ACCEPTING BOTH MUNICIPAL AND INDUSTRIAL WASTES. INDUSTRIAL WASTES SUSPECTED TO HAVE BEEN DISPOSED OF INCLUDE LATEX WASTE AND PAINT SLUDGES. THROUGHOUT ITS IL YEARS OF OPERATION, THE FACILITY ROUTINELY VIOLATED OPERATING AND OTHER PERMITS ISSUED BY REGULATING AGENCIES. EPA BEGAN INVESTIGATING THE SITE IN 1982. TYPICAL WASTES ENCOUNTERED AT THE SITE INCLUDED MUNICIPAL REFUSE LATEX IN STRIPS AND SHEETS; SCATTERED CRUSHED, EMPTY, OR INTACT DRUMS; AND MANUFACTURED PLASTIC ITEMS. MUCH OF THE WASTE IS LOCATED ON LOW-LYING WETLAND SEDIMENTS; HOWEVER, THE AREA TO THE SOUTHWEST WAS EXCAVATED AND BACKFILLED WITH WASTES. CONSEQUENTLY, IN THAT AREA OF THE LANDFILL, WASTES ARE IN DIRECT CONTACT WITH THE SURFICIAL SAND AQUIFER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND GROUND WATER ARE VOCS INCLUDING BENZENE, OTHER ORGANICS INCLUDING PCBS, AND METALS INCLUDING ARSENIC AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES: GRADING, INSTALLATION OF A SOIL COVER, AND REVEGETATION OF ONSITE DIRECT CONTACT RISK AREAS; REMOVAL AND OFFSITE DISPOSAL OF DRUMS CONTAINING WASTES BY LANDFILLING (IF NOT HAZARDOUS) OR INCINERATION (IF HAZARDOUS); REPLACEMENT OF TWO DOMESTIC WELLS ADJACENT TO THE SITE; INSTITUTIONAL CONTROLS INCLUDING WELL AND LAND USE RESTRICTIONS; AND GROUNDWATER MONITORING THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS
 
Remedy:  THIS OPERABLE UNIT, CONSISTING OF THE LANDFILL AND CERTAIN ADJACENT AREAS EXCEPT THE POND, IS THE FIRST OF TWO FOR THE SITE. THE FIRST OPERABLE UNIT ADDRESSES THE SOURCE OF CONTAMINATION BY ELIMINATING THE EXISTING DIRECT CONTACT RISKS POSED ON THE LANDFILL. THIS FIRST OPERABLE UNIT ALSO ADDRESSES THE POTENTIAL ONSITE AND OFFSITE DIRECT CONTACT RISKS POSED BY CONTAMINATED GROUND WATERS. THE SECOND OPERABLE UNIT WILL INVOLVE CONTINUED STUDY AND REMEDIATION OF THE POND DIRECTLY ADJACENT TO THE LANDFILL.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY FOR THIS OPERABLE UNIT INCLUDE:

-- INSTITUTIONAL RESTRICTIONS ON ALL WATER WELL INSTALLATIONS ON THE SITE;
-- INSTITUTIONAL RESTRICTIONS ON ALL SHALLOW AQUIFER WATER WELL INSTALLATIONS IN AREAS ADJACENT TO THE SITE WHICH HAVE BEEN IDENTIFIED AS AT SOME POTENTIAL RISK;
-- GRADING, SOIL COVER, AND REVEGETATION OF AREAS ONSITE WHERE DIRECT CONTACT RISKS HAVE BEEN IDENTIFIED. THIS WILL BE DONE IN ACCORDANCE WITH THE DELAWARE SOLID WASTE DISPOSAL REGULATION, AUGUST 1974;
-- REMOVAL AND OFFSITE DISPOSAL OF DRUMS CONTAINING WASTES AND DRUM CONTENTS EITHER BY LANDFILLING (IF NOT HAZARDOUS) OR INCINERATION AT A PERMITTED INCINERATOR (IF HAZARDOUS);
-- REPLACEMENT OF TWO DOMESTIC WELLS ADJACENT TO THE SITE WHICH HAVE BEEN IDENTIFIED AS BEING POTENTIALLY AT SOME RISK FROM THE SITE;
-- INSTITUTIONAL RESTRICTIONS ON COMMERCIAL AND RESIDENTIAL BUILDING DEVELOPMENT ON THE SITE;
-- INSTALLATION OF MONITORING WELLS ADJACENT TO TIDBURY CREEK TO MONITOR THE QUALITY OF GROUND WATER DISCHARGES;
-- GROUNDWATER MONITORING TO ENSURE THE EFFECTIVENESS OF THE REMEDIAL ACTION;
 
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