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Record of Decision System (RODS)

HUNTS DISPOSAL LANDFILL

Abstract

Site Name:  HUNTS DISPOSAL LANDFILL
Address:  CO LINE RD & FOLEY RD 
City & State:  CALEDONIA  WI  53108
County:  RACINE
 
EPA ID:  WID980511919
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-90/148
ROD Date:  09/29/1990
Operable Unit(s):  01
 
Media:  SOIL SEDIMENT DEBRIS GROUND WATER
 
Contaminant:  VOCS, BENZENE, TCE, XYLENES, ACIDS, METALS, ARSENIC, CHROMIUM
 
Abstract:  THE 84-ACRE HUNTS DISPOSAL SITE IS AN INACTIVE LANDFILL IN CALEDONIA TOWNSHIP, RACINE COUNTY, WISCONSIN. ONSITE FEATURES INCLUDE A 35-ACRE LANDFILL SURROUNDED BY WOODLANDS, WETLANDS, AGRICULTURAL AREAS, AND A LAKE. PART OF THE SITE THAT INCLUDES THE LANDFILL IS WITHIN THE 100-YEAR FLOODPLAIN OF THE ROOT RIVER. THE SITE OVERLIES A CONTAMINATED SURFICIAL SAND AND GRAVEL AQUIFER. PRIOR TO 1959, WHEN ONSITE LANDFILLING OPERATIONS BEGAN, THE SITE WAS A SAND AND GRAVEL PIT. BY 1961, MUNICIPAL AND INDUSTRIAL WASTES WERE DUMPED AND BURNED IN AN ONSITE OPEN PIT. APPROXIMATELY 620,000 CUBIC YARDS OF WASTE IS CURRENTLY LANDFILLED ONSITE WITH 168,000 CUBIC YARDS PRESENT BELOW THE WATER TABLE. SPECIFIC WASTES DISPOSED OF ONSITE INCLUDED WASTE NEWSPAPER INK, SPENT SOLVENTS, TANNERY WASTES, CHROMIC ACIDS, ARSENIC ACID, AND BERYLLIUM. BECAUSE STATE SITE INSPECTIONS REVEALED IMPROPER LANDFILLING PRACTICES, THE STATE ORDERED THE LANDFILL TO CLOSE IN 1974. EPA INVESTIGATIONS CONDUCTED IN 1984 AND 1988 CHARACTERIZED CONTAMINATED MEDIA AND DETERMINED THE EXTENT OF ONSITE CONTAMINATION. THE PRIMARY CONTAMINANT MIGRATION PATHWAY IS ONSITE GROUND WATER, WHICH IS CONTAMINATED BY WASTES LEACHING FROM THE ERODED LANDFILL CAP AND FROM WASTES BELOW THE WATER TABLE. THIS RECORD OF DECISION (ROD) ADDRESSES BOTH SOURCE CONTROL AND MANAGEMENT OF CONTAMINANT MIGRATION. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, SEDIMENT, DEBRIS, AND GROUND WATER ARE VOCS INCLUDING BENZENE, TCE, AND XYLENES; ACIDS; AND METALS INCLUDING ARSENIC AND CHROMIUM.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATING AND CONSOLIDATING 5,300 CUBIC YARDS OF ONSITE CONTAMINATED SOIL AND SEDIMENT FROM OUTSIDE THE LANDFILL AREA TO WITHIN THE LANDFILL, AND FILLING EXCAVATED AREAS WITH CLEAN SOIL; CONSTRUCTING A LEVEE TO PREVENT EROSION OF THE LANDFILL DURING FLOODS; CAPPING THE LANDFILL WITH A MULTI-LAYER CLAY AND SOIL COVER; INSTALLING AN ACTIVE LANDFILL GAS COLLECTION AND COMBUSTION SYSTEM; CONSTRUCTING A SLURRY WALL INTERSECTING THE CAP AND A SUBSURFACE CONFINING LAYER TO HYDRAULICALLY CONTAIN CONTAMINATED GROUND WATER; PUMPING AND OFFSITE TREATMENT OF GROUND WATER, FOLLOWED BY OFFSITE DISCHARGE; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING LAND AND GROUND WATER USE AND DEED RESTRICTIONS, AND SITE ACCESS RESTRICTIONS SUCH AS FENCING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $17,454,000, WHICH INCLUDES AN ANNUAL O&M COST OF $375,000.

PERFORMANCE STANDARDS OR GOALS: GROUND WATER CLEANUP LEVELS CHOSEN FOR THE SITE ARE STATE PREVENTIVE ACTION LIMITS (PALS), WHICH ARE EQUAL TO, OR MORE STRINGENT THAN FEDERAL MCLS. GROUND WATER CHEMICAL-SPECIFIC GOALS INCLUDE BENZENE 1 UG/L, TCE 0.18 UG/L, XYLENES 124 UG/L, ARSENIC 5 UG/L, AND CHROMIUM 5 UG/L. SPECIFIC CLEANUP STANDARDS FOR SOIL AND SEDIMENT HAVE NOT BEEN SET.
 
Remedy:  THIS REMEDIAL ACTION IS A SOURCE CONTROL ACTION FOR THE SITE. THIS ACTION ADDRESSES THE PRINCIPAL KNOWN THREATS AT THE SITE BY CONTAINMENT OF CONTAMINATED LANDFILL MATERIALS, SOILS AND GROUNDWATER. THE FUNCTION OF THE REMEDY IS TO SEAL OFF THE HUNT'S DISPOSAL LANDFILL AS A SOURCE OF CONTAMINATION AND REDUCE THE RISKS ASSOCIATED WITH EXPOSURE TO CONTAMINATED MATERIALS.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;

* INSTALLATION OF A FENCE AROUND THE LANDFILL SITE;
* CONSOLIDATION OF CONTAMINATED SOIL AND SEDIMENT ONTO THE LANDFILL;
* CONSTRUCTION OF A MULTILAYER LANDFILL CAP OVER THE LANDFILL AND CONSOLIDATED SOIL AND SEDIMENT IN COMPLIANCE WITH RESOURCE CONSERVATION AND RECOVERY ACT SUBTITLE D REQUIREMENTS;
* CONSTRUCTION OF A FULL SLURRY WALL AROUND THE SUBSURFACE PERIMETER OF THE LANDFILL; * PERFORMANCE OF GROUNDWATER GRADIENT CONTROL AND CONTAMINATED GROUNDWATER TREATMENT VIA EXTRACTION AND OFFSITE TREATMENT;
* CONSTRUCTION AND INSTALLATION OF AN ACTIVE LANDFILL GAS COLLECTION AND DESTRUCTION/TREATMENT SYSTEM;
* ENVIRONMENTAL MONITORING TO ASSURE PROTECTIVENESS AND EFFECTIVENESS OF THE REMEDY;
* INSTITUTIONAL CONTROLS GOVERNING GROUNDWATER USE AND DEVELOPMENT OF THE LANDFILL SITE;
* ADDITIONAL INVESTIGATION AND STUDY TO ASSIST IN DESIGN OF THE REMEDIAL ACTION; AND
* ADDITIONAL INVESTIGATION AND STUDY TO SUPPLEMENT REMEDIAL INVESTIGATION AND FEASIBILITY STUDY INFORMATION, INCLUDING POTENTIAL OFF-SITE GROUNDWATER CONTAMINATION AND THE NEED FOR ADDITIONAL REMEDIAL ACTIONS AT THE SITE.
 
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