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Record of Decision System (RODS)

MODERN SANITATION LANDFILL

Abstract

Site Name:  MODERN SANITATION LANDFILL
Address:  PROSPECT RD 
City & State:  LOWER WINDSOR TWP  PA  17404
County:  YORK
 
EPA ID:  PAD980539068
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-91/138
ROD Date:  06/28/1991
Operable Unit(s):  01
 
Media:  SOIL DEBRIS GROUND WATER
 
Contaminant:  VOCS, BENZENE, PCE, TCE, TOLUENE, XYLENES, METALS, LEAD
 
Abstract:  THE 83-ACRE MODERN SANITATION LANDFILL SITE IS AN ACTIVE LANDFILL IN THE TOWNSHIPS OF WINDSOR AND LOWER WINDSOR, YORK COUNTY, PENNSYLVANIA. LAND USE IN THE AREA IS PREDOMINANTLY AGRICULTURAL AND RESIDENTIAL, WITH NEARBY WOODLAND AREAS. THE SITE INCLUDES AN OLD, INACTIVE, UNLINED 66-ACRE LANDFILL AREA, WHICH IS THE SUBJECT OF THIS RECORD OF DECISION (ROD), AND AN ADJACENT ACTIVE 17-ACRE DOUBLE-LINED LANDFILL AREA TO THE NORTH. OTHER SITE FEATURES INCLUDE BORROW AREAS FOR LANDFILL SOIL COVER MATERIAL; GROUND WATER EXTRACTION SYSTEMS TO THE EAST, WEST, AND SOUTH OF THE LANDFILL; A WASTEWATER TREATMENT PLANT; A LANDFILL GAS-EXTRACTION SYSTEM; AND A LOW-PERMEABILITY FINAL COVER SYSTEM. SINCE THE EARLY 1940'S, MODERN TRASH REMOVAL HAS USED THE SITE FOR MUNICIPAL, AND NON-HAZARDOUS AND HAZARDOUS INDUSTRIAL WASTE STREAM DISPOSAL ACTIVITIES. INDUSTRIAL WASTE DISPOSED OF ONSITE INCLUDES INORGANIC PRODUCTION RESIDUES, PESTICIDE WASTE SLUDGE, PCB WASTES, AND OIL AND PAINT WASTE. IN 1977, A GROUND WATER INTERCEPTOR TRENCH WAS CONSTRUCTED TO COLLECT LEACHATE FROM THE WEST SIDE OF THE SITE. THE COLLECTED WATER CURRENTLY IS PUMPED TO THE ONSITE TREATMENT FACILITY. IN 1981, THE STATE DETECTED ONSITE GROUND WATER CONTAMINATION BY VOCS ON THE WESTERN SITE BORDER, AND IN 1983, DETERMINED THAT THE WESTERN INTERCEPTOR TRENCH SHOULD BE UPGRADED AND MODIFIED, AND THAT QUARTERLY SAMPLING OF MONITORING WELLS SHOULD BE IMPLEMENTED TO DETECT THE LEACHATE SEEPS AND THE PRESENCE OF LEACHATE CONSTITUENTS IN GROUND WATER. AS A RESULT, EXTRACTION WELLS TO AUGMENT THE WESTERN INTERCEPTOR TRENCH WERE INSTALLED. LEACHATE STUDIES IN 1985 ALSO IDENTIFIED ORGANIC CONTAMINATION IN THE EASTERN SITE AREA; AND, AS A RESULT, 13 EXTRACTION WELLS WERE INSTALLED ALONG THE EASTERN PERIMETER. FOUR SURFACE IMPOUNDMENTS WERE OPERATED ONSITE TO TREAT GROUND WATER AND LEACHATE COLLECTED BY THE INTERCEPTOR AND EXTRACTION WELLS. IN 1987, THE SURFACE IMPOUNDMENTS WERE CLEAN CLOSED, AND A REPLACEMENT TREATMENT FACILITY, WHICH INCLUDED METAL PRECIPITATION, FILTRATION, AND AIR STRIPPING, WAS CONSTRUCTED. IN ADDITION, AS OF 1990, 64 OF THE 66-ACRE UNLINED LANDFILL HAD BEEN COVERED WITH A LOW PERMEABILITY CAP. THIS ROD PROVIDES A FINAL REMEDY FOR THE SOURCE OF LEACHATE SEEPS AND GROUND WATER CONSTITUENTS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, DEBRIS, AND GROUND WATER ARE VOCS INCLUDING BENZENE, PCE, TCE, TOLUENE, AND XYLENES; AND METALS INCLUDING LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES COMPLETING THE LOW PERMEABILITY CAP AND FINAL COVER SYSTEM OVER THE 66-ACRE UNLINED LANDFILL; EXPANDING THE EXISTING GROUND WATER EXTRACTION SYSTEM ON BOTH THE EASTERN AND WESTERN SIDES OF THE SITE; MAINTAINING THE ONSITE WASTEWATER TREATMENT FACILITY THAT TREATS EXTRACTED GROUND WATER WITH PHYSICAL/CHEMICAL AND BIOLOGICAL TREATMENT, FOLLOWED BY FILTRATION AND AIR STRIPPING PRIOR TO DISCHARGE OF THE TREATED WASTEWATER ONSITE; MANAGING THE LANDFILL GAS COLLECTION SYSTEM; AND CONTINUING GROUND AND SURFACE WATER MONITORING. THE PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $18,078,000, WHICH INCLUDES AN ANNUAL O&M COST OF $1,175,000.

PERFORMANCE STANDARDS OR GOALS; GROUND WATER CLEAN-UP GOALS ARE BASED ON STATE AND FEDERAL STANDARDS AND BACKGROUND CONTAMINANT LEVELS, WHICHEVER ARE LOWER. CHEMICAL-SPECIFIC GROUND WATER GOALS INCLUDE BENZENE 5 UG/L (MCL), PCE 5 UG/L (MCL), AND TCE 5 UG/L (PMCL).
 
Remedy:  MODERN LANDFILL IS LOCATED IN THE TOWNSHIPS OF WINDSOR AND LOWER WINDSOR, IN YORK COUNTY, PA, AND IS ADJACENT TO PROSPECT ROAD APPROXIMATELY ONE-HALF MILE SOUTH OF ROUTE 124. THE LANDFILL HAS BEEN USED CONTINUALLY FOR WASTE DISPOSAL SINCE THE EARLY 1940'S, AND IT HAS PRINCIPALLY ACCEPTED MUNICIPAL/RESIDUAL WASTES THROUGHOUT ITS HISTORY OF OPERATION. EVIDENCE EXISTS, HOWEVER, THAT SOME DISPOSAL OF HAZARDOUS SUBSTANCES HAS OCCURRED AT THIS SITE, THOUGH THE EXACT QUANTITIES, THE NATURE OF THESE SUBSTANCES, AND THE PARTICULAR LOCATIONS OF THEIR DISPOSAL ARE CURRENTLY UNKNOWN TO EPA. ACCORDING TO EXISTING RECORDS, SOME OF THESE WASTES HAVE BEEN REMOVED FROM THE SITE. IN RESPONSE TO PUBLIC HEALTH CONCERNS, MODERN TRASH REMOVAL OF YORK, INC., UNDER A 1987 ADMINISTRATIVE CONSENT ORDER AND AGREEMENT WITH THE PENNSYLVANIA DEPARTMENT OF ENVIRONMENTAL RESOURCES (PADER), CONDUCTED A REMEDIAL INVESTIGATION/FEASIBILITY STUDY (RI/FS) FOR THIS SITE. EARLY IN THE RI PROCESS, IT WAS DETERMINED THAT GROUNDWATER CONTAMINATION EMANATES FROM THE OLD, UNLINED PORTION OF THE LANDFILL. THIS UNLINED PORTION, WHICH IS CURRENTLY INACTIVE, IS PART OF WHAT IS REFERRED TO AS THE CERCLA SITE, BECAUSE IT IS THE SUBJECT OF EPA'S AND PADER'S REMEDIAL EFFORTS UNDER CERCLA. THE SELECTED REMEDY FOR THIS SITE ADDRESSES THE LONG-TERM THREATS PRESENT AT THE MODERN LANDFILL SITE.

THE PRINCIPAL COMPONENTS OF THE SELECTED REMEDY ARE AS FOLLOWS;
* CONTINUED OPERATION AND MAINTENANCE OF ALL PREVIOUS REMEDIAL ACTIONS CONDUCTED ONSITE, INCLUDING THE LANDFILL CAP, GROUNDWATER EXTRACTION SYSTEM, ONSITE WASTEWATER TREATMENT FACILITY, GAS EXTRACTION SYSTEM (FOR REMOVAL AND DESTRUCTION OF LANDFILL GENERATED METHANE GAS) AND GROUNDWATER AND SURFACE WATER MONITORING.
* COMPLETION OF THE LANDFILL CAP SYSTEM AND FINAL COVER FOR THE UNLINED 66-ACRE LANDFILL. * MAINTENANCE OF SITE FENCING AND ALL ACCESS RESTRICTIONS.
* THE ADDITION OF EXTRACTION WELLS TO THE EASTERN AND WESTERN EXTRACTION SYSTEMS TO PREVENT CONTAMINATED GROUNDWATER FROM BYPASSING THOSE SYSTEMS.
* THE COMPLETION OF ADDITIONAL MONITORING AND/OR EXTRACTION WELLS AS NEEDED TO ENSURE PROTECTIVENESS AND TO CONTROL GROUNDWATER FLOW, RESPECTIVELY.
* AS A GOAL, RESTORE CONTAMINATED GROUNDWATER TO BACKGROUND QUALITY.
 
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