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Record of Decision System (RODS)

TYSONS DUMP

Abstract

Site Name:  TYSONS DUMP
Address:  UNOBTAINABLE 
City & State:  UPPER MERION TWP  PA  19406
County:  MONTGOMERY
 
EPA ID:  PAD980692024
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-90/102
ROD Date:  09/28/1990
Operable Unit(s):  03
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, TOLUENE, XYLENES
 
Abstract:  THE 4-ACRE TYSON DUMP #1 SITE IS AN ABANDONED SEPTIC AND CHEMICAL WASTE DISPOSAL AREA IN UPPER MERION TOWNSHIP, MONTGOMERY COUNTY, PENNSYLVANIA. THE SITE CONSISTS OF A SERIES OF ABANDONED UNLINED LAGOONS IN A FORMER SANDSTONE QUARRY, AND IS BORDERED BY UNNAMED TRIBUTARIES TO THE SCHUYLKILL RIVER ON THE EAST AND WEST, AND A RAILROAD SWITCHING YARD TO THE NORTH. BEYOND THE RAILROAD YARD IS A FLOODPLAIN/WETLANDS AREA AND THE SCHUYLKILL RIVER, WHICH FLOWS SOUTHEAST TOWARD PHILADELPHIA. THE RIVER IS THE MAIN SOURCE OF DRINKING WATER IN THE AREA. BARBADOES ISLAND LIES IN THE CENTER OF THE RIVER IN THE SITE VICINITY AND IS USED AS AN ELECTRICAL SUBSTATION. FROM 1960 UNTIL 1973, THE PRIVATELY OWNED SITE WAS USED FOR THE DISPOSAL OF LIQUID SEPTIC TANK WASTES, SLUDGES, AND CHEMICAL WASTES THAT WERE HAULED ONSITE IN BULK TANK TRUCKS. IN 1973, THE STATE ORDERED THE SITE OWNER TO CLOSE THE FACILITY. IN 1983, EPA REQUIRED THAT IMMEDIATE REMOVAL MEASURES BE TAKEN, INCLUDING CONSTRUCTING A LEACHATE COLLECTION AND TREATMENT SYSTEM WITH DRAINAGE CONTROLS, COVERING THE SITE, AND IMPLEMENTING SITE ACCESS RESTRICTIONS. IN 1984, THE FIRST RECORD OF DECISION (ROD) FOR THE SITE WAS ISSUED FOR OPERABLE UNIT 1 (OU1), WHICH DOCUMENTED A REMEDY THAT INCLUDED EXCAVATION AND OFFSITE DISPOSAL OF LAGOON MATERIALS. IN 1988, A SECOND ROD WAS SIGNED, WHICH DOCUMENTED A REMEDY FOR TREATING THE GROUND WATER CONTAMINATION UNDER THE OFFSITE AREAS (OU2), INCLUDING THE RAILROAD YARD AND WETLANDS AREAS, USING STEAM STRIPPING FOLLOWED BY LIQUID-PHASE CARBON ADSORPTION AS A POLISHING STEP. THIS THIRD ROD ADDRESSES OU3, THE FURTHER REMEDIATION OF THE CONTAMINATED GROUND WATER THAT HAS MIGRATED UNDER THE SCHUYLKILL RIVER. ADDITIONAL GROUND WATER INVESTIGATIONS WILL BE CONDUCTED ON THE NORTH SIDE OF THE RIVER, AND BASED ON THE RESULTS, A FOURTH OPERABLE UNIT MAY BE IDENTIFIED. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING TOLUENE AND XYLENES.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES INSTALLING ADDITIONAL RECOVERY WELLS ON THE SOUTH BANK OF THE SCHUYLKILL RIVER AND ON BARBADOES ISLAND, FOLLOWED BY TREATING THE CONTAMINATED GROUND WATER AT THE EXISTING TREATMENT FACILITY ON THE SOUTH BANK OF THE RIVER; EXPANDING THE CAPACITY OF THE EXISTING TREATMENT FACILITY; INVESTIGATING HYDROGEOLOGIC CONDITIONS ON THE NORTH SIDE OF THE RIVER TO ASSESS ENVIRONMENTAL IMPACT AND THE NEED FOR ADDITIONAL RODS; AND IMPLEMENTING INSTITUTIONAL CONTROLS TO RESTRICT GROUND WATER USE. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $10,100,000, WHICH INCLUDES AN ANNUAL O&M COST OF $834,000 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS: DISCHARGE LIMITS FOR TREATED GROUND WATER WERE CALCULATED BY THE STATE BASED ON RISK FACTORS, DILUTION WITHIN THE RIVER, AND STATE AND FEDERAL STANDARDS. THESE LIMITS ARE TOLUENE 1.52 MG/L (BASED ON A CHRONIC WQC OF 0.33 MG/L) AND XYLENE 0.97 MG/L (BASED ON AN MCL OF 10.0 MG/L).
 
Remedy:  THIS REMEDY ADDRESSES CONTAINMENT AND REMEDIATION OF CONTAMINATED GROUND WATER BY REDUCING HE RISKS POSED BY THE SITE THROUGH ENGINEERING AND INSTITUTIONAL CONTROLS.

THE SELECTED REMEDY INCLUDES THE FOLLOWING MAJOR COMPONENTS:

* INSTALLATION OF SIX ADDITIONAL RECOVERY WELLS ON THE SOUTH BANK OF THE SCHUYLKILL RIVER, EXPANDING THE EXISTING INTERIM GROUND WATER RECOVERY SYSTEM FROM SEVEN RECOVERY WELLS TO THIRTEEN RECOVERY WELLS.
* INSTALLATION OF GROUND WATER RECOVERY WELLS ON BARBADOS ISLAND, UNLESS A MORE SUITABLE LOCATION FOR PUMPING GROUND WATER IS DETERMINED DURING THE DESIGN OF THIS REMEDY.
* CONSTRUCTION OF A PIPELINE, IF NECESSARY, BENEATH THE SCHUYLKILL RIVER TO TRANSPORT CONTAMINATED GROUND WATER, PUMPED FROM BARBADOS ISLAND, OR MORE SUITABLE LOCATIONS AS DETERMINED DURING DESIGN, TO THE EXISTING TREATMENT FACILITY LOCATED ON THE SOUTH BANK OF THE RIVER.
* INVESTIGATION OF HYDROGEOLOGICAL CONDITIONS ON THE NORTH SIDE OF THE SCHUYLKILL RIVER.
* OPERATION AND MAINTENANCE OF THE GROUND WATER RECOVERY SYSTEM AND GROUND WATER MONITORING, FOR 30 YEARS.
* INITIATION OF INSTITUTIONAL CONTROLS RESTRICTING GROUND WATER USE ON BARBADOS ISLAND AND ON THE NORTH SIDE OF THE RIVER WITHIN THE CONTAMINATED GROUNDWATER PLUME.
 
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