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Record of Decision System (RODS)

HELEVA LANDFILL

Abstract

Site Name:  HELEVA LANDFILL
Address:  GARAGE HILL ST 
City & State:  NORTH WHITEHALL TWP  PA  18037
County:  LEHIGH
 
EPA ID:  PAD980537716
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Amendment
ROD ID:  EPA/AMD/R03-91/124
ROD Date:  09/30/1991
Operable Unit(s):  01
 
Media:  GROUND WATER
 
Contaminant:  VOCS, BENZENE, PCE, TCE, TOLUENE, XYLENES
 
Abstract:  5-ACRE HELEVA LANDFILL SITE IS A FORMER SANITARY LANDFILL IN NORTH WHITEHALL TOWNSHIP, LEHIGH COUNTY, PENNSYLVANIA. LAND USE IN THE AREA IS PREDOMINANTLY RURAL WITH SCATTERED RESIDENCES. THE ESTIMATED 150 PEOPLE WHO RESIDE WITHIN ONE-QUARTER MILE OF THE SITE USED THE GROUND WATER UNDERLYING THE SITE AS THEIR DRINKING WATER SUPPLY PRIOR TO 1986. FROM 1967 TO 1981, THE HELEVA LANDFILL ACCEPTED MUNICIPAL AND INDUSTRIAL WASTES, WHICH INCLUDED LARGE VOLUMES OF LIQUID TCE. AS A RESULT OF HELEVA'S DENIED REQUESTS FOR SOLID WASTE PERMITS AND REFUSAL TO IMPLEMENT A STATE ORDERED BIOSTIMULATION PROJECT, THE STATE CLOSED THE LANDFILL IN 1981. A NUMBER OF SUBSEQUENT STATE INVESTIGATIONS REVEALED GROUND WATER CONTAMINATION BY VOCS, OTHER ORGANICS, AND DNAPLS AT LEVELS THAT EXCEEDED STATE AND FEDERAL GROUND WATER LIMITS. A 1985 RECORD OF DECISION (ROD) ADDRESSED ONSITE GROUND WATER CONTAMINATION AND PROVIDED FOR EXTENDING AN EXISTING WATER MAIN; CAPPING THE ENTIRE LANDFILL; CONSTRUCTING SURFACE WATER DIVERSIONS AND GAS VENTING SYSTEMS; CONSTRUCTING AN ONSITE GROUND WATER TREATMENT FACILITY; ESTABLISHING A PUMPING AND TREATING SYSTEM FOR THE CONTAMINATED NEARGRADIENT GROUND WATER; AND GROUND WATER SAMPLING AND MONITORING. CONSTRUCTION OF ALL OF THESE MAJOR REMEDIAL ACTIVITIES HAS BEEN COMPLETED EXCEPT FOR THE GROUND WATER EXTRACTION AND TREATMENT COMPONENT. THIS ROD AMENDS THE GROUND WATER COMPONENT BASED ON DATA FROM THE 1989 PREDESIGN STUDY WHICH DETERMINED THAT COLLECTION OF DOWNGRADIENT GROUND WATER IS TECHNICALLY FEASIBLE. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING BENZENE, PCE, TCE, TOLUENE, AND XYLENES.

THE AMENDED REMEDIAL ACTION FOR THIS SITE INCLUDES CONTINUING WITH THE SELECTED REMEDY FROM THE PREVIOUS ROD AND REPLACING THE GROUND WATER PORTION WITH EXTRACTING NEAR GRADIENT GROUND WATER TO CONTAIN THE HIGHLY CONTAMINATED DISSOLVED PLUME IMMEDIATELY IN THE VICINITY OF DNAPL CONTAMINATION IN THE GROUND WATER; PUMPING AND ONSITE TREATMENT OF THE DOWNGRADIENT PORTION OF THE AQUIFER, AND DISCHARGING THE TREATED GROUND WATER ONSITE TO SURFACE WATER. THE ESTIMATED PRESENT WORTH COST FOR THIS AMENDED REMEDIAL ACTION IS $40,950,000, WHICH INCLUDES AN ANNUAL O&M COST OF $1,848,000 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS; DOWNGRADIENT GROUND WATER WILL BE REMEDIATED TO STATE BACKGROUND LEVELS INCLUDING BENZENE 0.2 UG/L, PCE 0.03 UG/L, TCE 0.03 UG/L, AND TOLUENE 0.2 UG/L. THE STATE AND FEDERAL ARARS FOR REMEDIATION OF NEARGRADIENT GROUND WATER TO BACKGROUND LEVELS AND MCLS WILL BE WAIVED DUE TO TECHNICAL IMPRACTICABILITY.
 
Remedy:  THE REMEDIAL ACTION SELECTED IN THE 1985 ROD CONSISTS OF;
* EXTENDING AN EXISTING WATER MAIN FROM IRONTON TO ORMROD
* CAPPING THE ENTIRE 25-ACRE LANDFILL ACCORDING TO RESOURCE CONSERVATION AND RECOVERY ACT (RCRA) STANDARDS
* CONSTRUCTING SURFACE WATER DIVERSION AND GAS VENTING SYSTEMS
* CONDUCTING A PREDESIGN STUDY TO DELINEATE FULLY THE SOURCE OF CONTAMINATION AND DETERMINE SINKHOLE ACTIVITY
* PUMPING AND TREATING OF THE NEARGRADIENT GROUND WATER TO REDUCE THE SOURCE OF GROUND WATER CONTAMINATION
* CONSTRUCTING APPROPRIATE GROUND WATER TREATMENT FACILITIES SO THAT THE TREATED GROUND WATER MAY BE DISCHARGED TO NEARBY COPLAY CREEK.

DESCRIPTION OF THE AMENDED SELECTED REMEDY THE ORIGINAL SELECTED REMEDY REMAINS THE SAME EXCEPT FOR THE GROUND WATER PUMP AND TREATMENT COMPONENT, WHICH IS AMENDED AS FOLLOWS;PUMP AND TREAT BOTH THE NEARGRADIENT GROUND WATER TO CONTAIN THE DISSOLVED PLUME ASSOCIATED WITH CONTAMINANTS IN THE FORM OF DENSE NON-AQUEOUS PHASE LIQUIDS (DNAPLS), AND THE DOWNGRADIENT GROUND WATER TO RESTORE THAT PORTION OF THE AQUIFER TO USEABILITY.
 
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