Record of Decision System (RODS)
|Site Name:||MALVERN TCE|
|Address:||258 N PHOENIXVILLE PK|
|City & State:||MALVERN PA 19355|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Media:||Debris, Groundwater, Other, Sediment, Soil, Surface Water|
|Contaminant:||Base Neutral Acids, Dioxins/Dibenzofurans, Inorganics, Metals, PAH, Pesticides, VOC|
Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.
The Malvern TCE Superfund site is located in Chester County, Pennsylvania. The site is owned and operated by Chemclene Corporation (Chemclene), which presently sells hydraulic oil and industrial cleaning solvents. The site encompasses approximately five acres, and includes a Main Plant Area connected to a Former Disposal Area by a narrow meadow corridor. A Transcontinental natural gas pipeline right-of-way extends along the southern boundary of the site, with residential areas and areas with natural forestation and vegetation bordering the property to the west, north and east.
Existing facilities at the main plant include a former distillation building, a storage building which has collapsed, a concrete pad area, an open garage, and seven above-ground storage tanks. One 8,000-gallon tank contains hydrogen peroxide and the other six are currently empty. From 1952 until 1992, Chemclene sold and reclaimed industrial cleaning solvents including trichloroethene (TCE), 1,1,1-Trichloroethane (1,1,1-TCA), perchloroethylene (PCE), and methylene chloride (MEC). These solvents were used by local industries for degreasing metal parts and other cleaning purposes. Chemclene used a distillation process to remove impurities from the chlorinated solvents. The distilled solvents were then returned to customers for reuse.
Prior to 1976, Chemclene reportedly buried drums containing the still bottom sludges from the distillation process in the Former Disposal Area and Mounded Area, approximately 1,900 feet southwest of the main plant. The Former Disposal Area consists of two unlined earthen pits, each approximately 30 feet by 50 feet by 15 feet deep. This area is currently secured by an 8-foot high chain link fence. The Mounded Area, located on the western edge of the Former Disposal Area, is approximately 8 feet wide by 150 long.
In the spring of 1980, TCE was detected in groundwater from several wells in the vicinity of the Chemclene facility. At this time, Chemclene began sampling domestic wells in the immediate vicinity of the property. Analytical results revealed contamination of the underlying aquifer with chlorinated ethenes and related compounds. The contaminated home wells were located south of the Former Disposal Area, with several located in the Hillbrook Circle residential development. Chemclene furnished activated carbon filter units to 20 residential wells within the Hillbrook Circle Development and conducted periodic sampling of home wells in accordance with its Domestic Well Management Plan until November 1994. In February 1995, the Environmental Protection Agency (EPA) assumed control of maintenance activities of the carbon filter units and periodic sampling of the home wells. In August 1995, several of the filter systems were upgraded by EPA. In addition to the installation of carbon filters, Chemclene conducted removal actions following the detection of soil and groundwater contamination in 1980. Debris and approximately 300 drums were removed from the Former Disposal Area excavations. Soils underlying the Former Disposal Area were excavated to a depth of 15 feet and transported for disposal at a Resource Conservation and Recovery Act (RCRA) permitted disposal facility. Additional drums were removed from the Mounded Area in late 1990; however, contaminated soil was left in place.
Four underground storage tanks (USTs) were removed from the main plant in 1986. Soil samples collected from below the excavation grade of the tanks exhibited elevated concentrations of TCE, PCE, and 1,1,1-TCA. In addition, elevated levels of volatile organic contaminants (VOCs) were detected in soil gas samples collected outside the distillation building in the Main Plant Area.
Chemclene entered into a Corrective Action Order with EPA in 1987. A RCRA Facilities Investigation (RFI) Work Plan was approved for the site in 1989. In July 1992, Chemclene withdrew its RCRA Part B Application as a treatment and storage facility, and stopped accepting waste solvents for reclamation. Chemclene continues to operate a hauling operation and sells hydraulic fluid, raw TCE, and hydrogen peroxide from the site. Chemclene failed to complete the RFI and implement interim corrective measures. As a result, EPA began considering the site under the Superfund remedial program in November 1993. EPA conducted a Remedial Investigation (RI) which was completed in January 1997. The Feasibility Study (FS) was completed in June 1997. A Record of Decision (ROD) was issued in November 1997.
The selected remedy for the Malvern TCE site consists of five alternatives. The Environmental Protection Agency (EPA) selected Alternative WS-G-3a, Public Water Supply to prevent contact with groundwater contamination at residences affected or potentially affected by the site. A source of potable water shall be provided year round to residents by extending the existing waterline to the area of concern in the vicinity of the site.
EPA selected Alternative MPA-S-3, Capping to prevent direct contact with contaminated soils in the Main Plant Area and to reduce the potential for continued migration of these contaminants to the groundwater. The Main Plant Area shall be capped with a final cover and an Operations & Maintenance (O&M) program shall be implemented to maintain the integrity of the cap for a period of 30 years. The existing quonset hut structure has collapsed and is no longer acting as a cap to the soils beneath it. Therefore, it shall be decontaminated and removed. The former Underground Storage Tanks (USTs) previously excavated, and currently located on property adjacent to Chemclene, shall be decontaminated and properly disposed of or reused. The area occupied by the Main Building shall serve as a cap, and the Main Building shall be closed.
EPA selected Alternative MPA-G-6, Groundwater Collection, Treatment of Source Area, and Discharge to restore the site groundwater to beneficial use through removal and treatment of contaminated groundwater. This alternative includes extraction and treatment of groundwater via air stripping followed by carbon adsorption or U/V oxidation and subsequent reinjection of treated water to the aquifer. The performance of the extraction and treatment system shall be monitored through the use of monitoring wells, and institutional controls shall be enacted.
For the Disposal Area/Mounded Area soils, EPA selected Alternative FDA-S-4, Excavation, Off-Site Thermal Treatment, Disposal at a Hazardous Waste Landfill to reducethe potential for continued migration of contaminants in these soils to the groundwater. For the Former Disposal Area/Mounded Area Groundwater, EPA selected Alternative FDA-G-4, Natural Attenuation to reduce concentrations of contaminants in groundwater to Maximum Contaminant Levels (MCLs). Institutional controls will be used to identify the site as a property underlain by contaminated groundwater, and to prevent the human consumption of contaminated groundwater.
Alternative WS-G-3a: Estimated Capital Cost: $408,600 Estimated Annual O&M Costs: not provided Estimated Present Worth Costs: not provided Estimated O&M Costs: $97,371 Estimated Total Cost: $505,971
Alternative MPA-S-3: Estimated Capital Cost: $343,000 Estimated Annual O&M Costs: not provided Estimated Present Worth Costs: not provided Estimated O&M Costs: $30,000 (30 years) Estimated Total Cost: $940,441
Alternative MPA-G-6: Estimated Capital Cost: $1,233,000 Estimated Annual O&M Costs: $316,000 (30 years) Estimated Present Worth Costs: not provided Estimated Total Cost: $6,280,000
Alternative FDA-S-4: Estimated Capital Cost: $7,016,000 Estimated Annual O&M Costs: $0 Estimated Present Worth Costs: not provided Estimated Total Cost: 7,016,000
Alternative FDA-G-4: Estimated Capital Cost: $227,000 Estimated Annual O&M Costs: $42,000 (30 years) Estimated Present Worth Costs: not provided Estimated Total Cost: $786,647
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