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Record of Decision System (RODS)

STRASBURG LANDFILL

Abstract

Site Name:  STRASBURG LANDFILL
Address:  STRASBURG ROAD 
City & State:  NEWLIN TOWNSHIP  PA  19320
County:  CHESTER
 
EPA ID:  PAD000441337
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-89/074
ROD Date:  06/29/1989
Operable Unit(s):  02
 
Media:  GROUNDWATER LEACHATE
 
Contaminant:  VOCS, BENZENE, TCE, TOLUENE, XYLENES
 
Abstract:  THE STRASBURG LANDFILL SITE IS A 22-ACRE FACILITY IN WESTERN NEWLIN TOWNSHIP, CHESTER COUNTY, PENNSYLVANIA. THE SURROUNDING AREA INCLUDES FARMLAND AND 200 HOMES WITHIN ONE MILE OF THE SITE. TWO CREEKS, BRANDYWINE AND BRIAR RUN, FLOW WITHIN 0.5 MILE OF THE SITE'S WESTERN, SOUTHERN, AND EASTERN BORDERS AND RECEIVE SURFACE DRAINAGE. A MAJOR AQUIFER UNDERLYING THE LANDFILL PROVIDES DRINKING WATER VIA PRIVATE WELLS TO ALL LOCAL RESIDENCES. THESE PRIVATE WELLS ARE AS CLOSE AS 720 FEET TO THE LANDFILL. IN THE SPRING OF 1979 SITE OWNERS BEGAN ACCEPTING INDUSTRIAL WASTES AND HEAVY METALS WHICH, BY YEAR'S END, INCLUDED MORE THAN 1,000 YD3 OF POLYVINYL CHLORIDE WASTES, 2,052 YD3 OF INDUSTRIAL WASTES AND SLUDGE, AND 35,000 GALLONS OF HEAVY METAL SLUDGE. IN DECEMBER 1979 THE STATE CLAIMED THAT INDUSTRIAL WASTES FROM THE LANDFILL CAUSED EXCESSIVE SILTATION OF BRIAR RUN CREEK, AND EIGHT MONTHS LATER THE STATE PROHIBITED THE SITE OWNERS FROM RECEIVING ANY ADDITIONAL INDUSTRIAL WASTES. IN 1980 SAMPLING REVEALED VOC CONTAMINATION IN THE GROUND WATER AND BY APRIL 1983 LEACHATE SEEPED AT A RATE OF SEVERAL GALLONS PER MINUTE FROM THE SOUTHEASTERN PORTION OF THE LANDFILL. AFTER CHARGING THE SITE OWNERS WITH OPERATING VIOLATIONS AND SUBSEQUENTLY SUSPENDING THEIR OPERATING PERMIT, THE STATE ORDERED THE LANDFILL TO BE CLOSED. AS PART OF THE CLOSURE PLAN, LEACHATE WAS COLLECTED AND STORED IN 5,000 GALLON TANKS, AND THE LANDFILL WAS REGRADED AND COVERED. THE LEACHATE IS CURRENTLY TRANSPORTED DAILY TO AN OFFSITE TREATMENT FACILITY. ADDITIONALLY, SURFACE WATER RUNOFF WAS DIRECTED TOWARD A SEDIMENT POND WHICH DISCHARGED DIRECTLY INTO BRIAR RUN CREEK. PROPOSED CORRECTIVE MEASURES, HOWEVER, WERE NEVER COMPLETELY IMPLEMENTED. SEVERAL SEEPAGE AREAS HAVE SINCE BEEN OBSERVED NEAR THE LANDFILL. ONE LARGE SEEPAGE AREA IS NEAR THE SOUTHEASTERN CORNER OF THE LANDFILL. LIQUID FROM THE SEEP ULTIMATELY FLOWS INTO A SEDIMENT POND NEAR THE EASTERN EDGE OF THE LANDFILL WHICH DRAINS VIA A DRAINAGE CHANNEL TOWARDS BRIAR RUN CREEK. DURING HEAVY RAINFALLS THE SEDIMENT POND OVERFLOWS INTO BRIAR RUN CREEK. THE STATE HAS PERFORMED ANALYSES OF SEEP WATER FROM BRIAR RUN CREEK AND OF LEACHATE FROM A MANHOLE NEAR THE SEDIMENT POND AND HAS MONITORED GROUND WATER FOR VOCS. THREE RESIDENTIAL DRINKING WATER WELLS CONTAIN MULTIPLE ORGANIC COMPOUNDS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SEDIMENT POND AND GROUND WATER ARE VOCS INCLUDING TCE AND BENZENE, AND OTHER ORGANICS INCLUDING TOLUENE AND XYLENES.


THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES LEACHATE COLLECTION, USING AN INTERCEPTOR DRAIN, AND OFFSITE TREATMENT; AND PROVISION OF AN ALTERNATE WATER SUPPLY TO AFFECTED RESIDENCES BY INSTALLING POINT-OF-USE ACTIVATED CARBON TREATMENT SYSTEMS AT RESIDENCES WITH CONTAMINATED GROUND WATER ABOVE LEVELS OF CONCERN. THE ESTIMATED CAPITAL COST FOR THE REMEDIAL ACTION IS $42,850, WITH ESTIMATED ANNUAL O&M COSTS OF $4,500. COSTS ARE BASED ON AN ESTIMATE OF THREE RESIDENCES REQUIRING AN ALTERNATE WATER SUPPLY.
 
Remedy:  THE SELECTED REMEDIAL ACTION ALTERNATIVES (RAA) FOR THE ON-SITE LEACHATE SEEP AND FOR THE OFF-SITE CONTAMINATED RESIDENTIAL WELLS ARE DESCRIBED BELOW.

LEACHATE SEEP

THE SELECTED REMEDY FOR THE LEACHATE SEEP INVOLVES COLLECTING THE LEACHATE AND TREATING IT OFF-SITE. THE COMPONENTS OF THIS REMEDY ARE SUMMARIZED AS FOLLOWS;

EXCAVATE A DITCH BELOW THE LEACHATE SEEP APPROXIMATELY 25 FEET LONG, 5 FEET WIDE, AND 2 FEET DEEP;
INSTALL INTERCEPTOR DRAIN IN THE EXCAVATED DITCH;
CONNECT THE INTERCEPTOR DRAIN TO THE EXISTING LEACHATE COLLECTION AND STORAGE TANK SYSTEM, WITH A 4-INCH DIAMETER SOLID PVC PIPE, THROUGH THE EXISTING LEACHATE COLLECTION SYSTEM MANHOLE; AND CONTINUE CURRENT DISPOSAL ARRANGEMENTS, INCLUDING THE TRANSPORT OF LEACHATE TO A RCRA AUTHORIZED TREATMENT FACILITY.

CONTAMINATED WATER SUPPLY

THE SELECTED REMEDY FOR THE OFF SITE CONTAMINATED RESIDENTIAL WELLS INVOLVES THE INSTALLATION OF ACTIVATED CARBON TREATMENT SYSTEMS AT RESIDENCES WITH CONTAMINATED WATER ABOVE LEVELS OF CONCERN.

SUMMARY OF RISK AND RATIONALE FOR SELECTION OF ALTERNATIVES A TYPICAL AND A REASONABLE WORST-CASE SCENARIO WAS EVALUATED IN THE PUBLIC HEALTH EVALUATION FOR THE STRASBURG LANDFILL SITE. THE AVERAGE CONCENTRATIONS OF GROUNDWATER CONTAMINANTS FOUND IN THE RESIDENTIAL WELLS WERE USED IN THE TYPICAL EXPOSURE SCENARIO. THE MAXIMUM CONCENTRATION FOUND IN ANY OF THE RESIDENTIAL WELLS WAS USED TO REPRESENT A WORST CASE SCENARIO.

UNDER THE TYPICAL EXPOSURE SCENARIO, NO ADVERSE NON-CARCINOGENIC HEALTH EFFECTS WOULD BE EXPECTED. HOWEVER, THE CARCINOGENIC RISK IS CALCULATED TO BE ABOUT 1 IN 2,400 OR 400 TIMES GREATER THAN THE 1 X 10(-6) (ONE IN A MILLION) LIFETIME CANCER LEVEL PROPOSED BY THE EPA. UNDER THE REASONABLE WORST-CASE SCENARIO, NON-CARCINOGENIC ADVERSE EFFECTS MAY BE POSSIBLE. THE CARCINOGENIC RISK IS CALCULATED TO BE ABOUT 1 IN 1,350 OR 700 TIMES GREATER THAN THE EPA 1 X 10(-6) PROPOSED RISK LEVEL.

THE LEACHATE SEEP CONTROL ALTERNATIVE, TO COLLECT AND PIPE THE LEACHATE TO THE EXISTING COLLECTION AND STORAGE SYSTEM, WAS SELECTED BECAUSE IT MEETS ESTABLISHED REMEDIAL ACTION OBJECTIVES WITH REGARD TO HUMAN HEALTH AND THE ENVIRONMENT. THE COMPONENTS OF THIS ALTERNATIVE ARE WELL DEMONSTRATED AND REPRESENT A RELIABLE AND COST EFFECTIVE METHOD FOR LEACHATE SEEP COLLECTION AND DISPOSAL.

THE POINT-OF USE ACTIVATED CARBON TREATMENT ALTERNATIVE WAS SELECTED BECAUSE THE ALTERNATIVE MEETS ESTABLISHED REMEDIAL ACTION OBJECTIVES BY PROVIDING AN EFFECTIVE, RELIABLE TREATMENT METHOD TO REDUCE POTENTIAL HUMAN HEALTH RISKS FROM INGESTION, INHALATION AND DERMAL ADSORPTION OF CONTAMINATED GROUNDWATER. THE TREATMENT UNITS ARE COMMERCIALLY AVAILABLE AND CAN BE INSTALLED IN A SHORT TIME.
 
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