This report presents cost and performance data for the application of on-site incineration at the Coal Creek Superfund Site in Chehalis, Washington. A rotary kiln incinerator was operated from January 1994 to May 1994 as part of a remedial action. Contaminants of concern at the site included polychlorinated biphenyls (PCB) and lead.
The Coal Creek site was used for scrapping, salvaging, and repairing electrical equipment from 1949 to 1983. During this time, oil containing PCBs was drained on to the ground. Concentrations of PCBs were measured as high as 21,000 mg/kg at the site.
In October 1990, a Record of Decision (ROD) was signed, specifying excavation and on-site incineration of soil with greater than 50 mg/kg PCBs. The ROD also required a destruction and removal efficiency (DRE) of 99.9999% for the incineration. In 1992, the responsible parties (RP) entered into a Consent Decree with EPA, agreeing to implement the remedial action described by the ROD.
The incineration system consisted of a feed system, a rotary kiln, a secondary combustion chamber (SCC), and an air pollution control system (APCS). The soil was screened before being fed to the incinerator.
In the rotary kiln, organic compounds from the contaminated soil were volatilized and destroyed. The resulting ash was discharged from the kiln and quenched outside of the kiln, while exhaust gases were routed to the SCC. The SCC provided further combustion of PCBs in the off-gas, which was then quenched with water.
The APCS consisted of a baghouse and a scrubber, which removed particulate and acid gas, respectively.
Over a 5-month period, the incinerator processed approximately 9,700 tons of soil. Treatment performance and emissions data collected during this application indicated that all performance standards and emissions requirements were met.
The actual cost for remediation using the incineration system was approximately $8,100,000.
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