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Record of Decision System (RODS)

KEYSTONE SANITATION LANDFILL

Abstract

Site Name:  KEYSTONE SANITATION LANDFILL
Address:  RD #1 
City & State:  UNION TOWNSHIP  PA  17331
County:  ADAMS
 
EPA ID:  PAD054142781
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-90/101
ROD Date:  09/30/1990
Operable Unit(s):  01
 
Media:  SOIL GROUNDWATER
 
Contaminant:  VOCS, METALS, CHROMIUM, LEAD, BENZENE, PCE, TCE, OTHER ORGANICS, ACIDS, PHENOLS
 
Abstract:  THE 40-ACRE KEYSTONE SANITATION LANDFILL SITE, AN INACTIVE, PRIVATELY OWNED LANDFILL, IS IN UNION TOWNSHIP, ADAMS COUNTY, PENNSYLVANIA. SURROUNDING LAND USE IS PRIMARILY AGRICULTURAL WITH SCATTERED RESIDENCES. FROM 1966 TO 1990, THE UNLINED LANDFILL ACCEPTED HOUSEHOLD AND MUNICIPAL WASTES AS WELL AS INDUSTRIAL AND CONSTRUCTION DEBRIS, INCLUDING PHOSPHORUS-CONTAMINATED SAND, POTATO SLUDGE, RESIN SLUDGE, INCINERATION ASH, AND DRIED LATEX PAINT. THE VOLUME OF NON-HOMOGENEOUS WASTE AT THE SITE CURRENTLY IS 1.7 MILLION CUBIC YARDS. IN 1982, STATE INVESTIGATIONS REVEALED ONSITE GROUND WATER CONTAMINATION AND A CONTAMINATED ONSITE RESIDENTIAL WELL ATTRIBUTABLE TO LEACHATE FROM THE LANDFILL CONTENTS. IN 1984, EPA FOUND LOW-LEVEL CONTAMINATION IN NEARBY RESIDENTIAL WELLS. AS A RESULT OF THE GROUND WATER CONTAMINATION, EPA ORDERED KEYSTONE TO INSTALL AN ONSITE SPRAY IRRIGATION SYSTEM AND A LEACHATE COLLECTION SYSTEM TO PREVENT MIGRATION OF CONTAMINANTS OFFSITE. THIS RECORD OF DECISION (ROD) ADDRESSES OPERABLE UNIT 1 (OU1), THE CONTAINMENT OF ONSITE SOURCE AREA AND REMEDIATION OF ONSITE CONTAMINATED GROUND WATER. A SUBSEQUENT ROD WILL ADDRESS OFFSITE GROUND WATER CONTAMINATION IN MONITORING AND RESIDENTIAL WELLS (OU2). THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL AND GROUND WATER ARE VOCS INCLUDING BENZENE, PCE, TCE, VINYL CHLORIDE; OTHER ORGANICS INCLUDING ACIDS, AND PHENOLS; AND METALS INCLUDING CHROMIUM AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATING APPROXIMATELY 4,150 CUBIC YARDS OF CONTAMINATED SURFACE SOIL WITH CONSOLIDATION OF THE SOIL IN THE LANDFILL; PLACING A CAP ON THE LANDFILL AND SUBSEQUENT REVEGETATION; INSTALLING AN ACTIVE GAS EXTRACTION SYSTEM TO COLLECT GASES EMITTED FROM THE LANDFILL; PUMPING AND TREATMENT OF GROUND WATER USING EQUALIZATION, FLOCCULATION/PRECIPITATION, FILTRATION, ION EXCHANGE, AIR STRIPPING, AND FILTER PRESS TECHNOLOGIES, FOLLOWED BY OFFSITE DISPOSAL OF ANY SLUDGE PRODUCED BY THESE PROCESSES; DISCHARGING TREATED WATER ONSITE TO A SURFACE STREAM; MONITORING GROUND WATER, SURFACE WATER, AND SEDIMENT; INSTALLING AN IN-HOME WATER TREATMENT SYSTEM FOR THE ONSITE RESIDENT; AND IMPLEMENTING SITE ACCESS RESTRICTIONS AND INSTITUTIONAL CONTROLS, INCLUDING DEED, LAND USE, AND GROUND WATER RESTRICTIONS. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $9,156,950, WHICH INCLUDES AN ANNUAL O&M COST OF $217,000 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS: NO CHEMICAL-SPECIFIC CLEANUP GOALS WERE STATED IN THE ROD. FOR CARCINOGENIC COMPOUNDS, CLEANUP GOALS WERE ESTABLISHED TO REDUCE THE EXCESS LIFETIME CANCER RISK TO (10-4) TO (10-6). FOR NON-CARCINOGENIC COMPOUNDS, THE GOAL IS A HAZARD INDEX (HI) EQUAL TO 1 OR LESS. INDIVIDUAL GROUND WATER REMEDIATION STANDARDS ARE BASED ON THE MORE STRINGENT OF SDWA MCLS OR NON-ZERO MCLGS, OR STATE BACKGROUND LEVELS. IF THESE LEVELS CANNOT BE MET, THE ROD WILL BE AMENDED.
 
Remedy:  THE SELECTED REMEDY ADDRESSES THE PRINCIPAL THREAT POSED BY THE SITE FROM THE INGESTION OF GROUNDWATER BY REDUCING THE RISKS TO HUMAN HEALTH AND ENVIRONMENT THROUGH THE USE OF GROUNDWATER EXTRACTION AND TREATMENT AND THE INSTALLATION OF AN IMPERMEABLE CAP. IT DOES NOT PROVIDE TREATMENT OF THE WASTE, AS IT HAS BEEN FOUND TO BE IMPRACTICABLE. THIS REMEDY WILL PREVENT CONTINUED INFILTRATION FROM THE WASTES TO THE GROUNDWATER AND REDUCE THE CONCENTRATION AND PLUME OF GROUNDWATER CONTAMINATION. A SECOND OPERABLE UNIT WILL ADDRESS OFFSITE CONTAMINATION. ENGINEERING AND INSTITUTIONAL CONTROLS ARE USED TO EFFECT THIS REMEDIATION THROUGH THE FOLLOWING COMPONENTS;

* INSTALLATION AND MAINTENANCE OF AN IMPERMEABLE CAP AND GAS COLLECTION SYSTEM OVER A 40-ACRE SITE
* INSTALLATION AND MAINTENANCE OF GROUNDWATER EXTRACTION WELLS AND TREATMENT PLANT TO REDUCE THE CONCENTRATIONS OF VOLATILE ORGANIC COMPOUNDS AND METALS IN THE GROUNDWATER
* INSTALLATION AND MAINTENANCE OF A FENCE AROUND THE SITE
* MONITORING OF THE GROUNDWATER IN MONITORING AND RESIDENTIAL WELLS
* MONITORING OF THE SURFACE WATER AND SEDIMENTS
* PROVISION OF A POINT-OF-USE TREATMENT SYSTEM TO ONSITE RESIDENTS
* INITIATION OF DEED RESTRICTIONS REGARDING PRESENT AND FUTURE SITE ACTIVITIES INCLUDING LIMITATIONS ON CONSTRUCTION AND AQUIFER USE.

THIS SITE WILL HAVE A SECOND OPERABLE UNIT TO FURTHER STUDY THE GROUNDWATER CONTAMINATION IN THE OFFSITE MONITORING AND RESIDENTIAL WELLS.
 
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