PNA Remediation in a Railroad Switching Yard, Chicago, IL A locomotive diesel fuel release occurred at an active railroad switchyard. Subsequent site investigation by an environmental consultant revealed elevated levels of benzo(a)pyrene ranging from 2.38 mg/kg to 8.25 mg/kg to a depth of 4 feet. Because of the high rail trac density at this location, it was not feasible to close the rail spur for conventional remediation. The BIOX Process was chosen due to its ability to remediate the area without disrupting site activities. Pretreatment sample results revealed benzo(a)pyrene concentrations ranging from 2.38 mg/kg to 8.25 mg/kg while the site-specic cleanup objective was 0.008 mg/kg. A single BIOX treatment event was conducted at the site without disrupting normal activities. Post treat

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