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Record of Decision System (RODS)

OCONOMOWOC ELECTROPLATING CO., INC.

Abstract

Site Name:  OCONOMOWOC ELECTROPLATING CO., INC.
Address:  W2573 OAK STREET 
City & State:  ASHIPPIN  WI  53003
County:  DODGE
 
EPA ID:  WID006100275
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-90/129
ROD Date:  09/20/1990
Operable Unit(s):  01
 
Media:  SOIL SEDIMENT DEBRIS SLUDGE GROUNDWATER SURFACE WATER
 
Contaminant:  VOCS, TCE, TOLUENE, XYLENE, METALS, CHROMIUM, LEAD
 
Abstract:  THE 10.5-ACRE OCONOMOWOC ELECTROPLATING SITE ENCOMPASSES A 5-ACRE ACTIVE ELECTROPLATING FACILITY AND 5 ACRES OF ADJACENT WETLANDS IN DODGE COUNTY, ASHIPPUN, WISCONSIN. THE OCONOMOWOC ELECTROPLATING COMPANY'S (OEC) FACILITY INCLUDES A MAIN BUILDING THAT HOUSES PROCESS LINES, A WASTEWATER TREATMENT BUILDING, TWO FORMERLY USED WASTEWATER TREATMENT LAGOONS, AND VARIOUS STORAGE TANK AND CONTAINER DEPOSIT AREAS. RECREATIONAL FACILITIES, AND RESIDENCES AND BUSINESS THAT USE GROUNDWATER FOR THEIR DRINKING WATER SUPPLY, ARE IN PROXIMITY TO THE OEC FACILITY. IN ADDITION, DAVY CREEK, A SMALL CREEK AND WARM WATER SPORT FISHERY, FLOWS THROUGH THE WETLANDS 500 FEET SOUTH OF THE SITE. ELECTROPLATING, FINISHING, AND DEGREASING PROCESSES PERFORMED SINCE 1957 AT THE OEC FACILITY PRODUCE A MULTI-SOURCE EFFLUENT STREAM CONTAMINATED WITH HEAVY METALS AND VOCS. THE EFFLUENT, AS WELL AS ACCIDENTAL SPILLS AND LEAKS AROUND THE PROPERTY, HAVE RESULTED IN WIDESPREAD SITE CONTAMINATION. PRIOR TO 1972, UNTREATED WASTEWATERS WERE DISCHARGED DIRECTLY INTO THE DAVY CREEK WETLANDS, AND EVEN AFTER THE CONSTRUCTION OF TWO TREATMENT LAGOONS, UNTREATED WASTES AND SLUDGES OVERFLOWED THE LAGOONS AND CONTINUED TO ACCUMULATE IN THE WETLANDS. LAGOON SLUDGE REMOVAL WAS INITIATED BY OEC IN 1979 BUT WAS NEVER COMPLETED, AND THEREFORE, DISCHARGE OF CONTAMINANTS, INCLUDING RCRA-LISTED HAZARDOUS WASTE (F006), CONTINUED INTO THE WETLANDS. AN ESTIMATED 10,000 SQUARE YARDS OF WETLANDS ARE CONTAMINATED WITH METALS AND CYANIDE. HAZARDOUS WASTE WAS ALSO FOUND IN BETWEEN THE WALLS AND FLOOR OF THE WASTEWATER TREATMENT BUILDING (WHERE IT WAS PLACED AS A SEALANT), LEAKING FROM WASTE CONTAINERS, AND SPILLED IN A NORTH PARKING LOT AREA. DUE TO ITS COMPLEXITY, THE SITE HAS BEEN DIVIDED INTO FOUR OPERABLE UNITS FOR REMEDIATION; THE SURFACE WATER, SLUDGE AND CONTAMINATED SOIL ASSOCIATED WITH THE TWO LAGOONS (OU ONE); ALL OTHER CONTAMINATED SOIL AROUND THE OEC FACILITY NOT ASSOCIATED WITH THE LAGOONS OR FOUND BENEATH THE MANUFACTURING BUILDING, INCLUDING A FILL AREA, A LOWLANDS AREA, THE DRAINAGE DITCHES AND THE PARKING LOT AREA (OU TWO); THE ASSOCIATED CONTAMINATED GROUNDWATER (OU THREE); AND THE HIGHLY CONTAMINATED SEDIMENTS IN THE DAVY CREEK WETLANDS AREA (OU FOUR). ALL REMEDIAL ACTIONS FOR THE OPERABLE UNITS ARE FINAL EXCEPT FOR OPERABLE UNIT FOUR, WHICH IS AN INTERIM ACTION. FUTHHER WETLAND INVESTIGATION WILL DELINEATE THE FINAL REMOVAL AREA. IN ADDITION, IF, AFTER FURTHER INVESTIGATION, THE BUILDING FOUNDATION AND UNDERLYING SOIL WILL NEED REMEDIATING, AN APPROPRIATE REMEDIAL ACTION WILL BE DEVELOPED TO ACCOMPANY THE WETLAND REMEDIAL ACTION. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, SEDIMENT, DEBRIS, SLUDGE, GROUNDWATER AND SURFACE WATER ARE VOCS INCLUDING TCE, TOULENE, AND XYLENE; AND METALS INCLUDING CHROMIUM AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES CLEAN CLOSING THE LAGOON BY EXCAVATING 650 CUBIC YARDS OF LAGOON SLUDGE AND SURROUNDING SOIL, FOLLOWED BY STABILIZATION AND OFFSITE DISPOSAL OF THE MATERIAL AND PUMPING 72,000 GALLONS OF CONTAMINATED LAGOON WATER (WHICH WILL BE HAULED OFFSITE AND TREATED) (OU ONE); EXCAVATING 700 CUBIC YARDS OF SOIL AND DEBRIS WITH OFFSITE TREATMENT AND DISPOSAL (OU TWO); ONSITE GROUNDWATER PUMPING AND TREATMENT USING FILTRATION, ION EXCHANGE, AIR STRIPPING, AND CARBON ADSORPTION, FOLLOWED BY ONSITE DISCHARGE TO SURFACE WATER (A TREATABILITY STUDY WILL BE CONDUCTED TO DETERMINE THE EFFECTIVENESS OF THE ION EXCHANGE AND TO DETERMINE THE DISPOSITION OF THE RESIN) (OU THREE); EXCAVATING 6.000 CUBIC YARDS OF CONTAMINATED SEDIMENTS FROM DAVY CREEK AND ADJACENT WETLANDS TO A DEPTH OF TWO FEET, FOLLOWED BY OFFSITE STABILIZATION, TREATMENT, AND DISPOSAL OF THE CONTAMINATED SEDIMENTS AND MONITORING OF THE AREA; AND PERFORMING ADDITIONAL BIOASSAY AND RISK ASSESSMENT WORK TO DETERMINE FINAL EXPOSURE LEVELS (OU FOUR). THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $7,576,196, WHICH INCLUDES AN ANNUAL O&M COST OF $90,569. THE PRESENT WORTH COSTS ASSOCIATED WITH EACH OF THE FOUR OPERABLE UNITS ARE $490,302 (OU ONE); $258,667 (OU TWO); $1,831,805 (OU THREE), WHICH INCLUDES AN ANNUAL O&M COST OF $90,569; AND $4,995,422 (OU FOUR).

PERFORMANCE STANDARDS OR GOALS; THE LAGOON SOIL EXCAVATION LEVELS FOR THE OEC SITE OU ONE WILL ATTAIN BACKGROUND LEVELS CONSISTENT WITH STATE AND FEDERAL (RCRA) CLEAN CLOSURE LEVELS; EXCAVATION OF OU TWO SOIL WILL ATTAIN A 10-6 CUMULATIVE CARCINOGENIC RISK AND A CUMULATIVE HI LESS THAN 1 FOR NONCARCINOGENS. GROUNDWATER TREATMENT (OU THREE) WILL ATTAIN FEDERAL AND STATE GROUNDWATER CLEANUP STANDARDS AND ARE BASED ON STATE PREVENTATIVE ACTION LIMITS (PALS). CHEMICAL-SPECIFIC GROUNDWATER GOALS INCLUDES CHROMIUM 5.0 UG/L (PAL); AND TCE 0.18 (PAL). CLEANUP LEVELS FOR DAVY CREEK AND ADJACENT WETLANDS HAVE NOT BEEN DETERMINED.
 
Remedy:  THIS ROD ADDRESSES FOUR OPERABLE UNITS, OR DISCRETE ACTIONS AT THE SITE. THE SELECTED REMEDIES ARE FINAL REMEDIES FOR THE FIRST THREE OPERABLE UNITS, AND WILL ADDRESS THE PRINCIPAL THREATS AT THE SITE-THE GROUNDWATER CONTAMINANT PLUME AND ITS SOURCE ( I.E., CONTAMINATED SOILS AND SLUDGE LAGOONS). THE SELECTED REMEDY FOR THE FOURTH OPERABLE UNIT IS AN INTERIM REMEDY AND WILL ADDRESS CONTAMINATION IN DAVY CREEK AND THE WETLANDS.

THE SELECTED REMEDY CONSISTS OF THE FOLLOWING COMPONENTS;

* CLEAN CLOSE THE RCRA SUBTITLE C LAGOONS BY EXCAVATION OF APPROXIMATELY 650 CUBIC YARDS OF LAGOON SLUDGE AND SURROUNDING SOILS TO BE TREATED AND DISPOSED OF AT AN OFF-SITE RCRA SUBTITLE C FACILITY. TREATMENT OF 72,000 GALLONS OF CONTAMINATED LAGOON WATER AT A GROUNDWATER TREATMENT SYSTEM INSTALLED ON SITE;
* EXCAVATION OF APPROXIMATELY 700 CUBIC YARDS OF CONTAMINATED SOIL AND DEBRIS AT THE SITE. THE CONTAMINATED SOIL WILL BE TREATED AND DISPOSED OF AT AN OFF SITE RCRA SUBTITLE C DISPOSAL FACILITY;
* EXTRACTION OF THE GROUNDWATER CONTAMINANT PLUME TO STATE GROUNDWATER QUALITY STANDARDS WITH SUBSEQUENT TREATMENT. THE TREATED WATER SHALL BE DISCHARGED INTO THE ADJACENT DAVY CREEK IN COMPLIANCE WITH THE SUBSTANTIVE REQUIREMENTS OF THE WISCONSIN POLLUTANT DISCHARGE ELIMINATION SYSTEM (WPDES);
* EXCAVATION OF APPROXIMATELY 6,000 CUBIC YARDS OF CONTAMINATED WETLAND AND DAVY CREEK SEDIMENT TO BE TREATED AND DISPOSED OF AT A RCRA SUBTITLE C DISPOSAL FACILITY. ADDITIONAL MONITORING OF DAVY CREEK AND THE WETLAND WILL BE PERFORMED AFTER THE REMEDIATION TO DETERMINE THE EFFECTIVENESS OF THE REMEDY.
 
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