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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/R03-88/068
ROD Date:  09/30/1988
Operable Unit(s):  02
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, ORGANICS
 
Abstract:  THE TYSON'S DUMP SITE IS LOCATED IN UPPER MERION TOWNSHIP, MONTGOMERY COUNTY, PENNSYLVANIA. THE SITE IS AN ABANDONED SEPTIC AND CHEMICAL WASTE DISPOSAL FACILITY ON A FOUR-ACRE PLOT BORDERED ON THE EAST AND WEST BY UNNAMED TRIBUTARIES OF THE SCHUYLKILL RIVER. DURING ITS PERIOD OF OPERATION FROM 1962 TO 1970, SEVERAL FORMERLY UNLINED LAGOONS WERE USED TO DISPOSE OF VARIOUS INDUSTRIAL, MUNICIPAL AND CHEMICAL WASTES. SPILLS AND OVERFLOWS REPORTEDLY OCCURRED, DISPENSING CONTAMINANTS THROUGHOUT THE SITE. SURFACE WATER RUNOFF AND SEEPS CONTRIBUTED TO OFFSITE MIGRATION OF WASTES TOWARD THE SCHUYLKILL RIVER. IN 1973 THE STATE ORDERED THE ORIGINAL ONSITE DISPOSAL FACILITY CLOSED. AS PART OF THE CLOSURE, THE WASTE LAGOONS WERE EMPTIED, BACKFILLED, AND VEGETATED, AND THE CONTENTS TRANSPORTED OFFSITE. AN EPA INVESTIGATION OF THE SITE IN 1983 RESULTED IN FURTHER REMEDIAL MEASURES INCLUDING THE CONSTRUCTION OF A LEACHATE COLLECTION AND TREATMENT SYSTEM, DRAINAGE CONTROLS, A COVER OVER THE SITE, AND A FENCE AROUND THE LAGOON AREA. A ROD FOR THE ON-SITE AREA WAS ISSUED IN DECEMBER 1984. THIS ROD WAS AMENDED IN MARCH 1988 AND INCORPORATED THE USE OF VACUUM EXTRACTION TO REMOVE CONTAMINATION FROM SOILS AND BEDROCK UNDERLYING THE ON-SITE AREA. FURTHER INVESTIGATIONS OF THE OFF-SITE AREA OF THE SITE INDICATED A NEED FOR REMEDIAL ACTION. SUBSEQUENTLY, THE OFF-SITE AREA WAS DIVIDED UP INTO FIVE OPERABLE UNITS. THIS ROD ADDRESSES THE DEEP AQUIFER OPERABLE UNIT ONLY. CONTAMINATION IS BELIEVED TO BE MIGRATING TOWARDS AND WITHIN THE DEEP AQUIFER IN THE FORM OF DENSE NON-AQUEOUS PHASE LIQUIDS. INVESTIGATIONS REVEALED THAT AMBIENT SITE CONDITIONS FOR THE OTHER FOUR OPERABLE UNITS REPRESENTED AN ACCEPTABLE LEVEL OF RISK, AND SO REMEDIATION WAS CONSIDERED UNNECESSARY. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING 1,2,3-TRICHLOROPROPANE, TOTAL XYLENES, AND TOLUENE; AND OTHER ORGANICS.


THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES PUMPING AND TREATMENT OF CONTAMINATED GROUND WATER FROM THE BEDROCK AQUIFER USING AIR STRIPPING WITH VAPOR-PHASE CARBON (VPC) FOR TREATMENT OF GASEOUS EMISSIONS AND, IF NECESSARY, GRANULAR ACTIVATED CARBON (GAC) POLISHING OF AIR STRIPPED WATER WITH DISCHARGE OF TREATED WATER TO RIVER; OFFSITE INCINERATION OF ORGANIC-PHASE CONDENSATE PRODUCED FROM STEAM REGENERATION OF VAPOR-PHASE CARBON BEDS; AND GROUND WATER MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $6,170,000 WITH ANNUAL O&M COSTS OF $424,300, OR $6,910,000 AND $509,900 RESPECTIVELY, IF GAC POLISHING IS IMPLEMENTED.
 
Remedy:  THE SELECTED REMEDY INCLUDES INTERCEPTION AND TREATMENT OF CONTAMINATED GROUNDWATER FROM THE BEDROCK AQUIFER THROUGH A SERIES OF PUMPING WELLS TO BE LOCATED ALONG THE SOUTH BANK OF THE SCHUYLKILL RIVER. MOST OF THE CONTAMINANTS ARE BEING ADDRESSED BY THE ONGOING VACUUM EXTRACTION REMEDIAL ACTION, HOWEVER, INTERCEPTING GROUNDWATER FROM THE BEDROCK AQUIFER WILL MINIMIZE GROUND-WATER DISCHARGE FROM THE CONTAMINATED AREA INTO THE RIVER. THE RECOVERED GROUNDWATER WILL BE TREATED BY AIR STRIPPING WITH VAPOR-PHASE CARBON (VPC) FOR OFF-GAS TREATMENT. THE ORGANIC-PHASE CONDENSATE FROM STEAM REGENERATION OF THE CARBON BEDS WOULD BE SENT OFF-SITE FOR DESTRUCTION VIA INCINERATION. THIS SELECTED SITE REMEDY ATTEMPTS TO ENSURE COMPLIANCE WITH ALL ARARS, BUT AT A MINIMUM WILL BE CONSISTENT TO THE EXTENT PRACTICABLE, WITH THOSE SPECIFIED HEREIN.
 
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