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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/R03-89/065
ROD Date:  11/30/1988
Operable Unit(s):  02
 
Media:  SEDIMENTS SURFACE WATER
 
Contaminant:  METALS, ARSENIC, CHROMIUM, LEAD
 
Abstract:  THE WILDCAT LANDFILL IS LOCATED 2.5 MILES SOUTHEAST OF DOVER, IN KENT COUNTY, DELAWARE. A 2.7-ACRE POND, FORMED BY THE LANDFILL BLOCKING NATURAL DRAINAGE FROM UPLAND AREAS, IS LOCATED ALONG THE NORTHWESTERN BORDER OF THE SITE. THE POND AND THE LANDFILL ARE LOCATED ALONG THE WEST BANK OF THE ST. JONES RIVER AND ARE BORDERED TO THE NORTH AND EAST BY THE RIVER AND ASSOCIATED MARSHLANDS, AND TO THE SOUTH AND WEST BY RESIDENTIAL AND COMMERCIAL DEVELOPMENT. PORTIONS OF THE SITE LIE WITHIN THE 100-YEAR FLOODPLAIN OF THE ST. JONES RIVER. THE LANDFILL WAS ADDRESSED IN THE FIRST OPERABLE UNIT RECORD OF DECISION SIGNED IN JUNE 1988. THIS OPERABLE UNIT DETAILS THE SELECTION OF A REMEDIAL ALTERNATIVE WHICH ADDRESSES THE LARGELY ENVIRONMENTAL CONCERNS THE LANDFILL POSES TO THE POND AND ASSOCIATED BIOTA. THE LANDFILL WAS OPERATED AS A STATE-PERMITTED SANITARY LANDFILL BETWEEN 1962 AND 1973, ACCEPTING BOTH MUNICIPAL AND INDUSTRIAL WASTES. INDUSTRIAL WASTES SUSPECTED TO HAVE BEEN DISPOSED OF ONSITE INCLUDE LATEX WASTE AND PAINT SLUDGES. DURING ITS 11 YEARS OF OPERATION, THE FACILITY ROUTINELY VIOLATED OPERATING AND OTHER PERMITS ISSUED BY THE REGULATORY AGENCIES. IN AUGUST 1973 THE FACILITY WAS ORDERED CLOSED BY THE STATE AND THE SITE OWNERS WERE REQUIRED TO COVER THE SITE WITH SOIL AND VEGETATION. EPA BEGAN INVESTIGATING THE SITE IN 1982. SURFACE WATER AND SEDIMENTS IN THE POND WERE CONTAMINATED BY INORGANIC CONSTITUENTS LEACHING FROM THE LANDFILL. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SEDIMENTS AND SURFACE WATER IN THE POND ARE METALS INCLUDING ARSENIC, CHROMIUM AND LEAD.


THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES DRAINING, FILLING, AND REVEGETATING THE POND AREA CONSISTENT WITH THE LANDFILL COVER SELECTED IN THE PREVIOUS ROD; CONSTRUCTING A NEW POND ELSEWHERE ON THE SITE; IMPLEMENTING INSTITUTIONAL CONTROLS FOR LAND USE RESTRICTIONS; AND GROUND WATER MONITORING UPGRADIENT OF THE NEW POND. POND WATER WILL BE DISCHARGED TO ST. JONES RIVER, TO THE NORTH OF THE SITE.
 
Remedy:  THIS OPERABLE UNIT CONSISTS OF THE POND LOCATED ADJACENT TO THE LANDFILL AND IT IS THE SECOND OF TWO OPERABLE UNITS FOR THE SITE. THE FIRST OPERABLE UNIT RECORD OF DECISION (ROD) WAS ISSUED ON JUNE 29, 1988. IT ADDRESSED THE SOURCE OF CONTAMINATION BYELIMINATING THE EXISTING DIRECT CONTACT RISKS POSED BY THE LANDFILL CONTENTS. THE FIRST ROD ALSO ADDRESSED THE LEACHATE SEEPS ADJACENT TO THE POND AS PART OF THE SELECTED REMEDY. THE REMEDY SELECTION FOR THE POND IS BASED UPON THE REMEDY SELECTED FOR THE LANDFILL AND UPON AN ADDITIONAL STUDY BY THE U.S. FISH AND WILDLIFE SERVICE.

THE MAJOR COMPONENTS OF THE SELECTED POND REMEDY INCLUDE:

* DRAINING AND COVERING THE POND WITH SOIL. THIS WORK WILL BE DONE CONCURRENTLY WITH COVERING THE LEACHATE SEEPS AS DETAILED IN THE JUNE 29, 1988, ROD;
* TESTING AND DISCHARGE OF POND WATER TO THE ST. JONES RIVER;
* SLOPE AND VEGETATIVE STABILIZATION OF THE POND FILL SURFACE;
* DEVELOPMENT OF A NEW POND AND ASSOCIATED HABITAT IN ACCORDANCE WITH THE DESIGN SPECIFICATIONS AND SUCCESSSTANDARDS DEVELOPED BY THE APPROPRIATE STATE AND FEDERAL NATURAL RESOURCE AGENCY REPRESENTATIVES. THIS REPLACEMENT POND AND HABITAT WOULD BE DESIGNED TO HAVE HABITAT VALUES EQUAL TO OR GREATER THAN THE POND THAT IS TO BE COVERED;
* CONSTRUCTION OF A MONITORING WELL UPGRADIENT OF THE NEW POND CONSISTENT WITH THE MONITOR WELLS REQUIRED IN THE JUNE 29, 1988, ROD;
* MONITORING OF THE GROUND WATER AT THE NEWLY CONSTRUCTED WELL. DETECTION OF CONTAMINANTS IN THIS WELL WOULD TRIGGER AN ASSESSMENT OF THE SITUATION TO DETERMINE IF ANY ACTIONS ARE NECESSARY TO PROTECT THE REPLACEMENT POND AND HABITAT; AND
* DEVELOPMENT OF ADMINISTRATIVE RESTRICTIONS AT AND ADJACENT TO THE NEWLY CREATED POND AND AT THE AREA OF THE FILLED POND.
 
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