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Record of Decision System (RODS)



City & State:  WEST CALN TOWNSHIP  PA  19376
County:  CHESTER
EPA ID:  PAD980537773
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-93/177
ROD Date:  03/31/1993
Operable Unit(s):  03
Media:  Soil
Contaminant:  VOCs, Other Organics, Metals
Abstract:  The 4.4-acre William Dick Lagoons site is an inactive waste disposal site located in West Caln Township, Chester County, Pennsylvania. Land use in the area is predominantly residential, with a sparse population density. The majority of residents in the vicinity of the site use private wells as their drinking water supply. The site is located near Birch Run, a tributary of the West Branch of Brandywine Creek, which is used as a water source for populations as far as Wilmington, Delaware. From the late 1950s until 1970, Mr. William Dick used a series of onsite lagoons for the disposal of minor amounts of chemical residuals and final rinse waters from the interior cleaning of tank trailers owned by Chemical LeamanTank Lines, Incorporated (CLTL). These tank trailers were used to transport various chemical products using petroleum, latex, and resins. In 1971, Mr. Dick, CLTL, and the State reached an agreement to close the lagoons after a violation of the Clean Streams Law and a vandal-inflicted breach in one of the berms resulted in the discharge of approximately 300,000 gallons of wastewater into a nearby creek, the death of 2,600 fish, and the closure of public water supplies in the vicinity. Any residual remaining in the bottom of the lagoons after drainage was buried by pushing the earthen berms into the lagoons, filling them with soil, and planting a vegetative cover on the surface. In 1988, EPA sampled the former lagoon site and collected well water samples from several surrounding residences. These investigations revealed elevated levels of numerous organic compounds in the soil. In 1987, EPA required CLTL to install a fence around the site and point of entry. A 1991 ROD addressed a final remedy for OU1 for the provision of an alternate water supply to more than 50 residences impacted by the site, carbon filtration units on homes where TCE concentrations were above 5 ug/l, and also provided for an interim remedy for OU2 consisting of pumping and treatment of ground water and a hydrogeologic study. In 1992, CLTL also performed a soil vapor extraction/bioremediation treatability study to determine the feasibility of using this technology to remove contaminants from the onsite soil. This ROD addresses the 2.2 acres covered by the lagoons and the remaining 2.2 acres, which served as a burrow area for soil used to construct the compacted earthen ridges or berms around the perimeter of the lagoons, as OU3. The primary contaminants of concern affecting the soil are VOCs, including PCE and TCE; other organics, including PAHs and pesticides; and metals, including arsenic and chromium. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes determining theextent of soil contamination; excavating and treating approximately 24,000 yd[3] of contaminated soil onsite using thermal desorption; treating air emissions from the thermal desorption process using a control system consisting of a fabric filter for particulate removal, a wet scrubber for acidic gas conversion, and a carbon adsorption system for capturing the contaminants; managing and disposing of treatment residuals offsite; backfilling the treated soil in excavated areas; placing either a vegetative soil cover or multi-layer cap over the excavated areas; and implementing institutional controls, including deed restrictions. The estimated present worth cost for this remedial action ranges from $7,800,000 to $9,300,000, which includes an estimated annual O&M cost of $20,000 for 30 years. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil cleanup goals are based on either RCRA LDRs or a health-based risk level of 10[-6] or less and include acenaphthene 31 mg/kg; anthracene 94 mg/kg; benzo(a)pyrene 7,300 mg/kg; bis(2ethylhexyl)phthalate 266 mg/kg; chlorobenzene 5.7 mg/kg; chloroform 280 mg/kg; 4,4-DDE 7,250 mg/kg; 2,4-dichlorophenol; fluorene 49 mg/kg; fluoroanthrene 250 mg/kg; naphthalene 3,100 mg/kg; phenanthrene 94 mg/kg; PCE 1.2 mg/kg; 1,2,4-trichlorobenzene 61 mg/kg; and TCE 0.42 mg/kg. INSTITUTIONAL CONTROLS: Deed restrictions will be implemented to limit access to site property and to preserve the integrity of the multi-layer cap or vegetative cover.
Remedy:  The remedy described in this Record of Decision is for Operable Unit 3 at the Site. This remedy addresses the principal threat at the Site.

Operable Unit 1 at this Site involves providing a water line to protect residents from contaminated private well water. Operable Unit 2 involves an interim remediation of the groundwater which includes measures to pump and treat the groundwater and further investigation of the hydrogeology. A Record of Decision for Operable Unit One and the interim groundwater remediation measure for Operable Unit Two was issued on June 28, 1991. A decision on the final groundwater remediation is intended for this Site at a later date.

The remedy selected for Operable Unit 3 will reduce the concentrations of hazardous substances in the Site soils so that leaching of contaminants into the groundwater will be minimized. Reduction of the volatile organic compounds and semi-volatile organic compounds in the soils is necessary in order the groundwater will not continue to be impacted above acceptablelevels. In addition, the installation of a vegetative soil cover or multi-layer cap will prevent the surrounding community from exposure to Site- related contaminants through inhalation, ingestion, and dermal contact.

The selected remedy includes the following major components:
1. Determination of extent of soil contamination.
2. Excavation of contaminated soils and treatment of contaminated soils in an on-site thermal desorption unit.
3. Treatment of air emissions from the thermal desorption unit.
4. Management and off-site disposal of treatment residuals and wastewaters.
5. Backfilling of treated soils in the excavated areas and placement of a vegetative soil cover or multi-layer cap over such areas.
6. Operation and maintenance ("O&M") of the vegetative soil cover or multi-layer cap.
7. Institutional controls in the form of deed restrictions.
Text:  View full-text ROD [ 92K ]
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