CHEMICAL LEAMAN TANK LINES, INC.
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The Chemical Leaman Tank Lines, Inc. Superfund site is located near the town of Bridgeport, New Jersey. The 45.5-acre site includes an industrial tanker terminal and open wetlands. In 1961, Chemical Leaman Tank Lines, Inc. began operating a facility on 34 acres, to wash and rinse tanker trucks. Company operators emptied wastewater into seven on-site lagoons bordering the surrounding wetlands. Liquid sludge that accumulated at the bottom of the lagoons and additional holding tank spills eventually contaminated the groundwater supply. Until 1975, wastewater generated from the tank washing was released into the on-site lagoons, and ultimately discharged into Cedar Swamp and Moss Branch Creek, tributaries of the Delaware River. In 1980 and 1981, the New Jersey Department of Environmental Protection (NJDEP) sampling identified contamination – carbon tetrachloride and volatile organic compounds, or VOCs – in area groundwater, as well as private wells nearby. VOCs are contaminants that easily evaporate in the air. EPA added the site to the Superfund program’s National Priorities List (NPL) in 1984. This site is being addressed through Federal and Potentially Responsible Party (PRP) actions.
What Has Been Done to Clean Up the Site?
In 1987, the affected homes to the north of the site were connected to a public water supply. Homes located to the south and west of the site were connected to a public water supply in March 1993 and August 1995.
Construction of the GWETS began in May 2005, and finished in January 2007. System startup and shakedown began in February 2007. Equipment difficulties required refabrication and replacement. Following modification, the system was restarted in 2011 and continues to operate, effectively treating approximately 200 gallons per minute of contaminated groundwater to applicable standards.
Wetlands cleanup included excavation of about 7,500 cubic yards of contaminated sediments and soils in the wetlands. This material was disposed of at an appropriate off-site facility. The excavation finished in early 2006. The wetlands were restored in the spring of 2006. The remedy also included the construction of a berm around the active CLTL facility to protect the wetlands. Construction of the berm finished in July 2006. Additional erosion and storm water runoff control measures were implemented in July 2007, with the construction of a low-gradient, aggregate-lined swale adjacent to the wetlands.
As noted above, the OU2 soils remedy is ongoing, after design modification to in order to effectively manage the problems encountered during operation in 2015.
The effectiveness of the three OU remedies are regularly monitored in accordance with the approved plans and schedules.
What Is the Current Site Status?
The site is being addressed in four stages: immediate actions and three long-term remedial phases focused on cleanup of site groundwater, soil and wetlands contamination.
Immediate Actions: Activated carbon treatment units were placed in four homes with contaminated drinking water. These homes were later connected to a permanent public water line 1987.
Three more homes with threatened water supplies south and west of the site were connected to the public water system in March 1993 and August 1995.
Groundwater Contamination: The groundwater remedy selected in the site’s 1990 OU1 Record of Decision, or ROD, included groundwater extraction, treatment through chemical precipitation, air stripping and granulated activated carbon, and discharge of the treated groundwater into an unnamed tributary to the Delaware River. The full-scale Groundwater Extraction and Treatment System pumps, treats, and discharges approximately 200 gallons of contaminated groundwater per minute.toapplicable standards.
Soil/Source Contamination: Following soil investigations in the late 1990s and from 2000 to 2005, EPA selected the remedy for contaminated source areas in the site’s 2009 OU2 ROD. The OU2 remedy calls for the design of an Electrical Resistivity Heating (or “thermal treatment”) and Multi Phase Extraction (ERH-MPE) system, to remediate soils in three former on-site disposal areas. Design of the remedy was completed in August 2014. Thermal treatment began July 2015. . The system operated until December 2015, when PCBs were mobilized from soil vapor extraction (SVE) component, and could not be treated by the system. The sytem was shutdown in February 2016. Plans for the redisng of the system to handle the PCB contamination were developed and eventually approved by EPA. The thermal treatment sytem was started up again in March 2017 and contunues to operate.
Wetlands: EPA selected the wetlands remedy in the site’s 1993 OU3 ROD. The wetlands were restored in the spring of 2006. The effectiveness of the remedy is regularly monitored in accordance with the schedule in the site’s Wetlands Mitigation and Monitoring Plan.