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Record of Decision System (RODS)

OSBORNE LANDFILL

Abstract

Site Name:  OSBORNE LANDFILL
Address:  0.5 MILES E OF TOWN 
City & State:  GROVE CITY  PA  16127
County:  MERCER
 
EPA ID:  PAD980712673
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-90/099
ROD Date:  09/28/1990
Operable Unit(s):  01
 
Media:  SEDIMENT GROUNDWATER
 
Contaminant:  VOCS, BENZENE, TCE, OTHER ORGANICS, PCBS, PAHS, METALS, ARSENIC, CHROMIUM, LEAD
 
Abstract:  THE 15-ACRE OSBORNE LANDFILL SITE IS AN INACTIVE ABANDONED COAL STRIP MINE IN PINE TOWNSHIP, MERCER COUNTY, PENNSYLVANIA. THE SITE IS IN A SEMI-RURAL AREA WITH A LARGE NATURAL POND, WOODLANDS, AND WETLANDS BORDERING THE SITE TO THE WEST. THE SHALLOW CLARION AQUIFER IS PRESENT EAST OF THE STRIP MINE HIGHWALL. THE PORTION OF THE AQUIFER THAT FORMERLY OVERLAID THE SITE WAS EXCAVATED DURING STRIPPING ACTIVITIES. AFTER THE MINE WAS ABANDONED, THE STRIP MINE PIT FILLED WITH GROUND WATER. FROM THE LATE 1950S TO 1978, CONTAMINATED SPENT FOUNDRY SAND AND OTHER INDUSTRIAL AND MUNICIPAL WASTES WERE DISPOSED OF INTO THE PIT. OTHER WASTES INCLUDING TRASH AND DRUMS CONTAINING SOLVENTS, WASTEWATER, AND COOLANTS, WERE DISPOSED OF ONSITE, GRADUALLY FILLING THE STRIP MINE AND DISPLACING THE WATER. THE SITE HOLDS AN ESTIMATED 233,000 CUBIC YARDS OF FILL MATERIAL. IN 1983, COOPER INDUSTRIES, AN OPERATOR OF THE SITE, REMOVED APPROXIMATELY 600 DRUMS OF WASTE AND 45 CUBIC YARDS OF SOIL FROM THE SITE AND INSTALLED A FENCE TO RESTRICT SITE ACCESS. EPA HAS DIVIDED THE REMEDIAL ACTION INTO FIVE OPERABLE UNITS. OPERABLE UNIT 2 (OU2), WHICH ADDRESSES CONTAMINATED WETLAND SEDIMENT, AND OU5, WHICH ADDRESSES THE CONTAMINATED HOMEWOOD AQUIFER WILL BE IMPLEMENTED IN A SUBSEQUENT RECORD OF DECISION (ROD). THIS ROD ADDRESSES THE REMAINING THREE OPERABLE UNITS. OU1 ADDRESSES SOLID WASTE FILL MATERIAL INCLUDING FOUNDRY SAND AND OTHER ONSITE POND SEDIMENTS, OU3 ADDRESSES LEACHATE ASSOCIATED WITH THE ONSITE WATER TABLE, AND OU4 ADDRESSES THE CLARION AQUIFER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING SEDIMENT AND GROUND WATER ARE VOCS INCLUDING BENZENE AND TCE; OTHER ORGANICS INCLUDING PCBS AND PAHS; AND METALS INCLUDING ARSENIC, CHROMIUM, AND LEAD.


THE SELECTED REMEDIAL ACTION FOR THIS SITE IS COMPRISED OF THREE OPERABLE UNITS. THE PRIMARY REMEDY FOR OU1 INCLUDES CONSTRUCTING A SLURRY WALL BARRIER AROUND THE PERIMETER OF THE FILL, CONSTRUCTING A CLAY CAP OVER THE FILL MATERIAL, GROUND WATER PUMPING AND TREATMENT USING EQUALIZATION, PH ADJUSTMENT, CHEMICAL PRECIPITATION, CLARIFICATION, SAND FILTRATION, AND CARBON ADSORPTION, FOLLOWED BY INJECTION INTO THE ONSITE MINE PIT; OFFSITE DISPOSAL OF GROUND WATER TREATMENT RESIDUES; GROUND WATER MONITORING; AND IMPLEMENTING INSTITUTIONAL CONTROLS INCLUDING DEED RESTRICTIONS. A CONTINGENCY REMEDY FOR OU1 WILL BE IMPLEMENTED IF PERFORMANCE STANDARDS CANNOT BE MET DURING THE PRE-DESIGN STAGE OF REMEDY IMPLEMENTATION AND INCLUDES REGRADING THE SITE, EXCAVATING AND PLACING SOLID WASTE IN A RCRA SUBTITLE C ONSITE LANDFILL; LONG-TERM GROUND WATER MONITORING; AND IMPLEMENTING INSTITUTIONAL CONTROLS. IF THE PRIMARY REMEDY FOR OU1 IS IMPLEMENTED, NO ADDITIONAL ACTION, OTHER THAN THE PRIMARY OU3 REMEDY OF GROUND WATER MONITORING, IS NECESSARY FOR OU3. IF THE CONTINGENCY REMEDY FOR OU1 IS IMPLEMENTED, THE CONTINGENCY REMEDY FOR OU3 ALSO MUST BE IMPLEMENTED. THE CONTINGENCY REMEDY FOR OU3 INCLUDES DEWATERING THE SITE DURING EXCAVATION; ISOLATING THE FILL AREA FROM THE ONSITE MINE POOLS; TREATING THE GROUND WATER USING EQUALIZATION, CLARIFICATION, AND SAND FILTRATION FOR SOLIDS REMOVAL, AND CARBON ADSORPTION FOR ORGANICS REMOVAL, FOLLOWED BY ONSITE DISCHARGE; AND GROUND WATER MONITORING. THE SELECTED REMEDY FOR OU4 INCLUDES PUMPING AND TREATMENT OF GROUND WATER IN THE CLARION FORMATION USING AIR STRIPPING, ONSITE AIR EMISSIONS TREATMENT, ONSITE INJECTION OF TREATED GROUND WATER, AND GROUND WATER MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THE PRIMARY REMEDIES IS $18,681,000 WITH AN ANNUAL O&M COST OF $904,000 FOR 30 YEARS. IF THE CONTINGENCY REMEDIES ARE IMPLEMENTED, THE ESTIMATED PRESENT WORTH COST IS $17,811,000 WITH AN ANNUAL O&M COST OF $940,000 FOR 30 YEARS.


PERFORMANCE STANDARDS OR GOALS; THE SELECTED SOURCE REMEDY WILL NOT REDUCE THE CURRENT LEVEL OF CONTAMINATION IN THE FILL AREA, BUT WILL MAINTAIN AN AVERAGE PCB CONCENTRATION LEVEL OF 23 MG/KG. EPA'S PCB SPILL CLEANUP POLICY FOR A REDUCED ACCESS AREA IS MET BY THIS ALTERNATIVE. GROUND WATER CONTAMINANTS WILL BE REMEDIATED TO THE FOLLOWING BACKGROUND LEVELS; TCE 0.2 UG/L, BENZENE 0.2 UG/L, PCBS 1 UG/L, CHROMIUM 50 UG/L, LEAD 15 UG/L, AND ARSENIC 22 UG/L. IF ANY GROUND WATER CONTAMINANTS EXCEED SDWA MCLS OR MCLGS, THE REMEDY WILL CONTINUE UNTIL THESE GOALS ARE MET.
 
Remedy:  FIVE OPERABLE UNITS WERE IDENTIFIED AT THE OSBORNE LANDFILL SITE IN THE FEASIBILITY STUDY. THESE OPERABLE UNITS (OU) INCLUDE;
* THE SOLID WASTE FILL MATERIAL (OU1)
* WETLAND SEDIMENTS (OU2) - DECISION DEFERRED
* THE ONSITE WATER TABLE (OU3)
* THE CLARION FORMATION (OU4)
* THE HOMEWOOD FORMATION (OU5) - DECISION DEFERRED

EPA IS DEFERRING SELECTION OF A REMEDY FOR OPERABLE UNITS TWO AND FIVE, AND WILL ADDRESS THESE OPERABLE UNITS IN A SUBSEQUENT ROD. THE MAJOR COMPONENTS OF EACH REMEDY ARE DISCUSSED BELOW;

OPERABLE UNIT ONE - FILL MATERIAL

PRIMARY ALTERNATIVE; SLURRY WALL/PUMP AND TREAT ALTERNATIVE (S12). THIS ALTERNATIVE CONSISTS OF CONSTRUCTION OF A SLURRY WALL BARRIER AROUND THE PERIMETER OF THE FILL. WATER WILL BE PUMPED OUT OF THIS CONTAINMENT AND TREATED TO PRODUCE A NEGATIVE PRESSURE, EFFECTIVELY TRAPPING THE FILL CONTAMINANTS AND REMOVING THE THREAT TO GROUND WATER FROM FOUNDRY SANDS CONTAMINATED WITH POLYCHLORINATED BIPHENYLS (PCBS), SOLVENTS, METALS AND POLYAROMATIC HYDROCARBONS (PAHS).

THE MAJOR COMPONENTS OF THIS ALTERNATIVE INCLUDE;
* RUN-ON AND RUN-OFF CONTROL SYSTEMS INCLUDING A CLAY CAP, ONSITE DRAINAGE AND EROSION CONTROLS
* GROUPING AND BULKHEAD INSTALLATION TO SEAL OPENINGS OR CRACKS LINKING THE FILL TO THE MINE POOL
* CONSTRUCTION OF A SLURRY WALL AROUND THE PERIMETER OF THE FILL AREA AND INSTALLATION OF A CLAY CAP AND REVEGETATION
* INSTALLATION AND OPERATION OF EXTRACTION WELLS, TREATMENT OF THE EXTRACTED WATER AND SUBSEQUENT INJECTION INTO THE ONSITE MINE POOL
* INSTITUTIONAL CONTROLS AND GROUND WATER MONITORING.

CONTINGENCY ALTERNATIVE; RCRA SUBTITLE C LANDFILL ALTERNATIVE (S5) EXCAVATION AND PLACEMENT OF THE SOLID WASTES IN AN ONSITE LANDFILL WILL REMOVE THE THREAT TO GROUND WATER FROM FOUNDRY SANDS CONTAMINATED WITH PCBS, SOLVENTS, METALS, AND CARCINOGENIC PAHS.

THE MAJOR COMPONENTS OF THIS ALTERNATIVE INCLUDE;
* RUN-ON CONTROLS AND RUN-OFF CONTROL SYSTEMS INCLUDING A CAP, ON-SITE DRAINAGE AND EROSION CONTROLS
* EXCAVATION OF APPROXIMATELY 233,000 CUBIC YARDS OF FILL AND PLACEMENT OF THIS WASTE IN A RCRA SUBTITLE C ONSITE LANDFILL
* REGRADING AND REVEGETATION OF THE SITE AREA AND
* INSTITUTIONAL CONTROLS.

OPERABLE UNIT THREE - ON-SITE WATER TABLE

PRIMARY ALTERNATIVE IF THE SLURRY WALL IMPLEMENTATION IS EFFECTIVE, NO ADDITIONAL ACTION WILL BE REQUIRED FOR THE ONSITE WATER TABLE. CONTINGENCY ALTERNATIVE; COLLECTION AND TREATMENT OF ONSITE WATER TABLE ALTERNATIVE (GO3) THIS ALTERNATIVE MUST BE SELECTED IF THE CONTINGENCY ALTERNATIVE FOR OU1(S5 - RCRA SUBTITLE C LANDFILL) IS IMPLEMENTED.

THE MAJOR COMPONENTS OF THIS ALTERNATIVE INCLUDE;
* COLLECTION (OR DEWATERING OF THE FILL) OF THE WATER REMOVED DURING EXCAVATION ACTIVITIES
* CHEMICAL AND PHYSICAL TREATMENT OF COLLECTED GROUND WATER AND SUBSEQUENT ONSITE INJECTION INTO THE MINE POOL
* GROUNDWATER MONITORING.

OPERABLE UNIT FOUR - CLARION AQUIFER

SELECTED ALTERNATIVE; EXTRACTION, PHYSICAL TREATMENT, AND ONSITE INJECTION ALTERNATIVE (GC3) THIS ALTERNATIVE WILL REDUCE THE LEVEL OF VINYL CHLORIDE CONTAMINATION IN THE CLARION FORMATION AND REDUCE POTENTIAL HUMAN HEALTH RISKS ASSOCIATED WITH THE USE OF THIS AQUIFER.

THE MAJOR COMPONENTS OF THIS ALTERNATIVE INCLUDE;
* CONSTRUCTION OF EXTRACTION WELLS IN THE CLARION FORMATION
* PUMPING OF GROUND WATER FOR ONSITE REMOVAL OF CONTAMINANTS BY AIR STRIPPING OF VOLATILE ORGANIC HYDROCARBONS
* INJECTION OF TREATED GROUND WATER ONSITE INTO THE MINE POOL
* GROUNDWATER MONITORING.
 
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