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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:  Amendment
ROD ID:  EPA/AMD/R03-88/045
ROD Date:  03/31/1988
Operable Unit(s):  01
 
Media:  SOIL
 
Contaminant:  VOCS
 
Abstract:  TYSON'S DUMP, A 4-ACRE ABANDONED SEPTIC AND CHEMICAL WASTE DISPOSAL SITE, IS LOCATED IN UPPER MERION TOWNSHIP, MONTGOMERY COUNTY, PENNSYLVANIA. SEVERAL FORMERLY UNLINED LAGOONS WERE USED TO STORE VARIOUS INDUSTRIAL, MUNICIPAL, AND CHEMICAL WASTES. SPILLS AND OVERFLOWS REPORTEDLY OCCURRED DURING THE PERIOD OF OPERATION, THUS ALLOWING FOR THE DISPERSAL OF WASTES THROUGHOUT THE SITE. SURFACE WATER RUNOFF AND SEEPS CONTRIBUTED TO OFFSITE MIGRATION OF THE WASTES TOWARD THE SCHUYLKILL RIVER. THE SITE IS BORDERED ON TWO SIDES BY UNNAMED TRIBUTARIES TO THE RIVER. WHEN THE PENNSYLVANIA DEPARTMENT OF ENVIRONMENTAL RESOURCES (PADER) ORDERED TWO DUMPS CLOSED IN 1973, THE OWNER OF THE LAND, GENERAL DEVICES INC., REMOVED SOME PONDED WATER BUT DID NOT ARRANGE FOR THE REMOVAL OF CONTAMINATED SOILS. IMMEDIATE REMOVAL MEASURES WERE INITIATED IN JANUARY 1983, FOLLOWING AN ANONYMOUS CITIZEN COMPLAINT ABOUT CONDITIONS AT THE SITE. THESE MEASURES INCLUDED; CONSTRUCTION OF A LEACHATE COLLECTION AND TREATMENT SYSTEM; INSTALLATION OF DRAINAGE CONTROLS AND A SITE COVER; AND FENCING OF THE LAGOON AREA. IN DECEMBER 1984, EPA ISSUED AN OPERABLE UNIT ROD FOR THE ONSITE AREA. REMEDIAL ACTIONS SELECTED IN THE ROD INCLUDE: EXCAVATION AND OFFSITE DISPOSAL OF CONTAMINATED SOILS AND SEDIMENTS; AND UPGRADING THE EXISTING AIR STRIPS TO TREAT LEACHATE, SHALLOW GROUND WATER, AND SURFACE RUN-ON. EPA BEGAN THE REMEDIAL DESIGN PHASE FOR THIS SELECTED ALTERNATIVE IN JANUARY 1985. IN THE FALL OF 1985, CIBA-GEIGY CORPORATION (CGC) AGREED TO CONDUCT A FURTHER INVESTIGATION OF THE OFFSITE AREA. IN NOVEMBER 1986, CGC INITIATED AN ONSITE PILOT STUDY USING AN INNOVATIVE VACUUM EXTRACTION TECHNOLOGY PROCESS. IN JUNE AND JULY 1987, FOUR RESPONSIBLE PARTIES, CGC, SMITH-KLINE BECKMAN, WYETH LABORATORIES, AND ESSEX GROUP SUBMITTED AN ALTERNATIVE PROPOSAL TO EPA FOR THE FIRST OPERABLE UNIT CLEANUP. THIS PROPOSAL INCORPORATED THE RESULTS OF THE VACUUM EXTRACTION PROCESS FOR REMEDIATING LAGOON SOILS. IN SEPTEMBER 1987, AFTER CLOSE REVIEW OF THE TECHNOLOGY, EPA DECIDED TO RECOMMEND A ROD CHANGE TO INCLUDE VACUUM EXTRACTION. THIS NEW ALTERNATIVE WAS NOT AVAILABLE WHEN THE ORIGINAL FEASIBILITY STUDY WAS CONDUCTED PRIOR TO THE 1984 ROD. IN ADDITION, CGC'S INVESTIGATION DISCOVERED THAT MOST OF THE CONTAMINATION FROM THE LAGOON AREAS HAD MIGRATED INTO THE BEDROCK AND EXCAVATION WOULD NOT REMOVE ALL THE CONTAMINANTS FROM THE AREA UNDERLYING THE SITE. THE PRIMARY CONTAMINANTS OF CONCERN ARE VOCS. THE FOUR INDICATOR COMPOUNDS INCLUDE BENZENE, TRICHLOROETHENE, TETRACHLOROETHENE, AND 1,2,3-TRICHLOROPROPANE.


THE AMENDED REMEDIAL ACTION FOR THIS SITE INCLUDES: IN-SITU TREATMENT OF SOILS AND BEDROCK USING VACUUM EXTRACTION; TREATMENT OF THE VACUUM-EXTRACTED WATER USING THE ONSITE LEACHATE WATER TREATMENT SYSTEM; INSTALLATION OF A SOIL COVER FOLLOWING TREATMENT; AND GROUND WATER MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $10,200,000.
 
Remedy:  THE INNOVATIVE TECHNOLOGY REMEDIAL ACTION ALTERNATIVE CONSISTS OF THE FOLLOWING;

* REMEDIATION OF THE CONTAMINATED SOILS THROUGH THE USE OF AN INNOVATIVE TECHNOLOGY REMEDIAL ACTION OF VACUUM EXTRACTION, DOWN TO LEVELS DETERMINED BY THE AGENCY TO BE PROTECTIVE OF HUMAN HEALTH AND THE ENVIRONMENT.
 
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