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City & State:  PAOLI  PA  19301
County:  CHESTER
EPA ID:  PAD980692594
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-92/151
ROD Date:  07/21/1992
Operable Unit(s):  01
Media:  Soil, Sediment, Debris, Ground water
Contaminant:  VOCs, Other Organics
Abstract:  SITE HISTORY/DESCRIPTION: The 428-acre Paoli Rail Yard site is a maintenance, storage, and repair facility located north of Paoli in Chester County, Pennsylvania. The site consists of the 28-acre rail yard and the surrounding 400-acre watershed. The site, which is mainly wooded, is bordered to the north by residential areas and to the south by commercial developments. Since 1915, the rail yard has provided general maintenance and repair support for rail cars. The site operates five track areas used for multiple rail lines, a power house, a freight house, and a repair shop. Prior to 1968, the site was owned by Pennsylvania Railroad, after which it changed hands several times. Contamination of the soil in and around the car shop is attributed to releases of fuel oil and PCB-laden transformer fluid from rail cars during maintenance and repair activities. In 1985, EPA identified PCB contamination in soil and sediment, and on building surfaces. The rail companies agreed to address site clean-up activities, including erosion, sedimentation, and storm water characteristics and control, decontamination, soil sampling, excavation of 3,500 cubic yards residential soil and implementation of worker protection measures. Further EPA investigations identified soil samples in and around the car shop, parallel to the rail tracks, and 10 feet below the facility that were contaminated by fuel oil in the form of benzene, toluene, ethylbenzene, and xylenes (BTEX). Sediment samples taken from the three creeks that drained the general rail area also showed PCB contamination decreasing further from the rail yard. Soil samples taken from residences lying adjacent to the facility identified topsoil contamination presumably resulting from soil erosion from the rail yard. This ROD provides a final remedy for contaminated soil (from the rail yard and residences), sediment, and structures at the Paoli Rail Yard, and contaminated ground water. The primary contaminants of concern affecting the soil, sediment, debris, and ground water are VOCs, including benzene, toluene, and xylenes; and other organics, including PCBs. PERFORMANCE STANDARDS OR GOALS: Soil clean-up standards at the rail yard are based on health-based levels, including PCB 25 mg/kg for soil onsite and 2 mg/kg for residential areas. Chemical-specific ground water clean-up goals are based on the more stringent of state standards or SDWA MCLs, and include benzene 5 ug/l. An ARAR waiver will also be issued for certain management controls at the TSCA waste landfill under CERCLA 121(d)(4). INSTITUTIONAL CONTROLS: Deed restrictions will be implemented onsite to protect the integrity of the remedy, and to prevent further development of the land or use of ground water for domestic purposes.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating andonsite treatment of approximately 28,000 cubic yards of contaminated soil with PCB concentrations of 25 mg/kg or greater, 3,000 cubic yards of previously excavated contaminated residential soil currently stored in an onsite containment cell with PCBs greater than 2 mg/kg, and stream sediment with PCB concentrations exceeding 1 mg/kg using solidification/stabilization processes, followed by disposal of the solidified mass in an onsite containment cell, with an impermeable cap; onsite decontamination of 35,000 square feet of high contact surfaces in the rail yard buildings and structures with PCB concentrations in excess of 10 ug/100 cm[2]; mitigating impacts to wetland areas from the sediment excavation; pumping and onsite treatment of fuel-oil contaminated ground water; recovering the oil using a fuel oil recovery system and disposing of the recovered oil offsite at a RCRA facility, treating the ground water using filtration and activated carbon with onsite discharge through a subsurface infiltration gallery, with offsite disposal of the spent carbon; implementing erosion controls to manage sediment and storm water run-off; backfilling and regrading, and revegetating excavated areas; monitoring soil, sediment, ground water and air; and implementing institutional controls including deed, land, and ground water use restrictions. The estimated present worth cost for this remedial action is $28,268,000, which includes an O&M cost of $494,000 for years 0-2 and $258,250 for the remaining 7.5 years.
Text:  View full-text ROD [ 117K ]
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