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Record of Decision System (RODS)



Address:  RTE 724 & WELLS RD 
City & State:  EAST COVENTRY TWP  PA  19457
County:  CHESTER
EPA ID:  PAD002353969
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-93/167
ROD Date:  06/30/1993
Operable Unit(s):  01
Media:  Soil; GW
Contaminant:  VOCs, Other Organics, Metals
Abstract:  The 4.7-acre Recticon/Allied Steel site is comprised of two former manufacturing facilities located in Parker Ford, Chester County, Pennsylvania. Land use in the area is predominantly industrial and commercial, with mixed agricultural and residential. The site is situated near two surface water bodies, the Schuylkill River and Pigeon Creek, a floodplain, wetlands, and sparse woodlands. Ground water is the principal source of drinking water for the area residences and offices. From 1974 to 1981, Recticon manufactured silicon wafers for the semiconductor industry on 1.8 acres of the site. Until 1975, facility operations included using and storing TCE and other solvents onsite. Spent TCE was stored in drums in the interior of the facility, which were periodically removed. The cutting and polishing areas, where the TCE was used, contained unbermed, recessed floor drains that were connected to process waste lines that discharged to the surface water drainage pipes and ditches. From 1979 to 1988, State sampling of soil, ground water, and surface water revealed the presence of VOCs, including TCE and DCE. In 1981, the State required Recticon to undertake ground water pumping, treatment, and monitoring activities. From 1970 to 1988, Allied Steel fabricated customized, pressurized steel vessels on the other 2.9 acres. Allied Steel reportedly used solvents, including TCE, TCA, and high-flash naphtha to clean a generator and other miscellaneous parts and equipment; and spread waste solvent on the ground surface to controldust. In 1984, Allied Steel conducted soil sampling that revealed TCE- contained soil, which the company subsequently excavated and removed. Because the recovery and treatment process implemented in 1981 did not resolve the contamination problem, the State required Recticon to remove TCE -contaminated soil. In 1988, the State required Allied Steel to plan for the remediation of ground water contamination and to implement a ground water recovery system, including construction of a stripping tower for the treatment of ground water. In 1990, EPA required the PRPs to install activated carbon filtration units in the homes and businesses near the site where VOCs were detected at or above MCLs. This ROD addresses a final action source control for the contaminated soil and ground water. The primary contaminants of concern affecting the soil and ground water are VOCs, including PCE and TCE; other organics, including PAHs; and metals, including arsenic. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating contaminated soil to a depth of 9 feet, storing the soil temporarily onsite, and disposing of the contaminated soil offsite; backfilling the excavated areas with the soil if analyses show that this soil meets the cleanup standard of less than 320 ug/kg of TCE; extracting and treating contaminated ground water onsite using granulated activated carbon to remove VOCs, with offsite discharge to the Schuylkill River, preceded by a predesign hydrogeologic investigation and well abandonment to eliminate the possibility that the existing pumping and monitoring wells act as a conduit for future ground water contamination; providing an alternate water supply by installing a municipal water line; monitoring the ground water; sampling the drainage ditch sediment to determine the source and extent of copper and zinc contamination; and performing a Phase I archaeological survey. The estimated present worth cost for this remedial action is $4,096,516, which includes an annual O&M cost of $172,141 over 30 years. PERFORMANCE STANDARDS OR GOALS: Soil cleanup goals will be based on removing all soil with concentrations of TCE >320 ug/kg. Ground water cleanup goals are based on the more stringent of SDWAMCLs or background levels, and include 1,2-DCA 5 ug/l; 1,1DCE 7 ug/l; cis- 1,2-DCE 70 ug/l; PCE 5 ug/l; TCE 5 ug/l; and vinyl chloride 2 ug/l. INSTITUTIONAL CONTROLS: Not applicable.
Remedy:  This is the only planned response action for the site. This remedy addresses source control of contaminated soil, groundwater remediation and an alternative water supply. Groundwater contamination represents a primary threat; therefore, the extraction and treatment of groundwater and analternative water supply will be required. Soils on-site represent a low- level threat that may potentially impact groundwater quality; therefore, an excavation and off-site disposal remedy for source control will be required.

The selected remedy includes the following major components:
-Installation of a municipal water line; -Excavation and off-site disposal of contaminated soils;
-Extraction and treatment of groundwater with discharge to the
Schuylkill River following a predesign hydrogeologic investigation and
well abandonment;
-Long-term groundwater monitoring;
-Verification sampling to determine the source and extent of the copper and zinc found in drainage ditch sediments; and
-Performance of a Phase I archaeological survey.
Text:  View full-text ROD [ 114K ]
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