Record of Decision System (RODS)
|Site Name:||HUNTERSTOWN ROAD|
|City & State:||STRABAN TOWNSHIP PA 17325|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Media:||Soil, Sediment, Debris, SW|
|Abstract:||The 22-acre Hunterstown Road site is an inactive waste disposal area located 1.5 miles northeast of Gettysburg in Straban Township, Adams County, Pennsylvania. Land use in the area is predominantly semi-rural, with some farmlands and residences adjacent to the site. The West Stream, Middle Stream, and East Stream are three unnamed tributaries that flow along portions of the site. Nearby residents use both ground water andthe public water supply as their drinking water sources. Site features include a lagoon, two drum burial areas, cornfield area, stressed vegetation area, borrow area, and widespread surface waste. Site contamination has resulted from improper disposal of waste from a septic tank cleaning operation. In 1975, the State investigated the site in response to a complaint from the County that Westinghouse Elevator Manufacturing Plant, located in Gettysburg, deposited drums containing waste onsite. In 1984, results of EPA investigations required Westinghouse to provide a temporary potable water supply to affected households and to remove all sludge and liquid materials from the lagoon. As a result, Westinghouse removed drums from the borrow area, lagoon, and the embankment, and removed sludge material from the lagoon. Following another site investigation in 1986, EPA required Westinghouse to remove two piles of bulk asbestos from the borrow area. In 1987, Westinghouse installed a fence around the lagoon, borrow area, and eastern portion of the south cornfield; installed dikes around the lower half of the lagoon and around the stressed vegetation area; applied lime to the lagoon and stressed vegetation area covered the lagoon with mulch; covered the stressed vegetation area with mulch and plastic sheeting; regraded the southwest corner of the lagoon; installed a silt barrier on the fence; removed contaminated debris from the East Stream channel; and removed a culvert and reshaped the channel in the East Stream. In 1988 and 1989, Westinghouse removed a large number of buried drums. In 1990, with EPA and State approval, Westinghouse treated ponded water from the two drum burial areas onsite using an air stripper and discharged the treated water onsite to surface water. The excavations then were lined and backfilled with clean fill, and the disturbed stream segments were restored to preexisting conditions, as feasible, and reseeded. The remaining principal threat at the site is a result of contaminated DNAPLs and surface soil migrating into the water table. This ROD addresses a final site remedy for the contaminated ground water plumes, lagoon area, stressed vegetation area, north and south cornfields, borrow area, East and Middle Streams, and the wetlands. The primary contaminants of concern affecting the soil, sediment, debris, and surface water are VOCs, including TCE; and metals, including chromium and lead. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating approximately 1,200 yd of contaminated soil from the lagoon area to a depth of two feet to remove soil with high levels of metals; separating and treating the soil offsite using incineration with offsite disposal of soil containing volatiles above RCRA LDRs or offsite stabilization and disposal of soil containing volatiles below RCRA LDRs; excavating and treating offsite approximately 5,100 yd of contaminated soil and debris from the stressed vegetation area using stabilization to remove metals, followed by offsite disposal of the treated residuals; placing a soil cover over the north and south cornfields and the borrow area to prevent contact with the remaining onsite contaminants and reseeding the area; backfilling and placing soil covers over all onsite excavated areas; dredging and treating sediment from the East and Middle Streams offsite using stabilization, followed by offsite disposal of residuals; restoring streams impacted by sediment removal; constructing artificial wetlands in an uncontaminated area onsite to replace permanently destroyed wetlands; extracting and treating onsite contaminated ground water to a depth of 800 feet using air stripping to remove VOCs, followed by onsite discharge of the treated water, treating air emissions using catalytic oxidation to destroy vinyl chloride and other VOCs; conducting TCLP testing and removing offsite any remaining soil that is classified as a RCRA hazardous waste; monitoring ground water and surface water; and implementing institutional controls, including deed andground water use restrictions. The estimated present worth cost of this remedial action is $9,008,000, which includes an estimated annual O&M cost of $78,470 for 30 years. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil, sediment, and debris excavation and cleanup goals were not provided, but are based on RCRA LDRs and State standards. Chemical-specific ground water cleanup goals are based on EPA Practical Quantitation Limits. Ground water must be remediated to background levels. An ARAR waiver will be issued for ground water contaminated with DNAPLs at a depth greater than 800 feet on the basis of technical impracticability. INSTITUTIONAL CONTROLS: Deed restrictions will be implemented onsite to prevent any use of ground water until EPA and the State determine that it has reached cleanup levels and to protect the integrity of the soil covers.|
Fred Shealer, the owner of a septic tank cleaning business, disposed of hazardous wastes and wastes containing hazardous substances obtained from several companies, on his property during the 1970's and early 1980's. This ROD addresses ground water, surface water, soil, and sediment contamination at the Site. The ground water at the Site and in nearby residential wells is contaminated above health based levels. Soils and sediments have also been contaminated above health based levels and the ecology of a stream at the Site has been damaged by Site contaminants. The Selected Remedy will address the Principal Threats at the Site which are Dense NonAqueous Phase Liquids (DNAPLs) in fractured bedrock, and the high levels of metals contamination in soils and sediments. The selected remedy for this Site addresses the long term threats present at the Hunterstown Road Site.
The selected remedy is a final ROD, the scope and role of which addresses all Site problems and principle threats at the Site to the maximumextent possible. The selected remedy includes the following components:
* Extraction wells to capture all ground water above a depth of 800 feet contaminated with Volatile Organic Hydrocarbons (VOCs).
* Treatment of contaminated ground water by air stripping followed by destruction of contaminants in the air stream using catalytic oxidation.
* Discharge of the treated water to an on-Site stream in compliance with NPDES limits.
* Deed restrictions prohibiting the use of wells on the Shealer property.
* Ground water monitoring, including identification and installation of monitoring wells in the regional ground water discharge area from the Site and residential well sampling.
Soils / Sediments
* LAGOON AND STRESSED VEGETATION AREAS - Excavation and offSite treatment of two feet of soil, backfill excavation and installation of a one foot deep soil cover.
* CORNFIELDS AND BORROW AREAS - Installation of a one foot deep soil cover over a geotextile and subsequent revegetation to prevent contact with contaminated soils.
* DRUM BURIAL AREAS - No additional action (Previous Removal Action Completed)
* EXTENDED SOIL COVER - Soil cover extended over contaminated soils between Lagoon Area, Stressed Vegetation Area and East Stream.
* EAST and WEST STREAM CONTAMINATED SEDIMENTS - Excavation and off-Site treatment and disposal.
* Fencing around soil covers and landscaping along fencing to minimize the visual impact on the community.
* No Current Action - The Selected Remedial Actions for other media will reduce contaminant levels in streams by preventing migration of contaminants via surface water runoff and ground water discharge.
* Replace Wetlands Permanently Damaged by Remedial Action and Restore Impacted Wetlands Areas.
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