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2.6 Previous Remedial Activities In March 1997 Environmental Chemical Corporation (ECC) sampled 10 locations to delineate the level and extent of the hydraulic oil contamination. The soil samples were taken approximately 12-18 inches below the ballast rock under the railroad ties and analyzed for total petroleum hydrocarbons (TPH) hydraulic oil by EPA Method 8015. The results ranged from <10 to 871 milligram per kilogram (mg/kg). The three samples with the highest concentrations of TPH were additionally analyzed by the California De-ionized Waste Extraction Test (CAL DI WET) and reported concentrations ranging from 7.7 to 63.0 milligrams per liter(mg/1). Four months later, on July 21, 1997, ECC applied a pentatonic solution called "Enhanced Cleanup" manufactured by Surface Technology Company to the contaminated areas. Approximately 300 gallons of clean water was applied to three distinct areas prior to applying the solution to the soil, ties, rails, rail anchors, and spikes. Seven days later, on July 28, 1997, the process was repeated. A month later, ECC took confirmation samples on August 27, 1997. Six grab samples were collected from 12 to 18 inches below the ballast rock and analyzed for TPH hydraulic oil and diesel and by the CAL DI WET test. The ECC sampling results are listed in the table below and the laboratory reports are in Appendix A. In June 1998, The Defense Logistics Agency (DLA) took twelve confirmation samples at six locations, obtaining samples at 1.5 feet, 2 feet, and 4 feet bgs. The samples were analyzed by Calscience Laboratories for TPH hydraulic oil, carbon chain C22-C32. All samples taken at 4 feet bgs reported concentrations less than 50 mg/kg (ppm). The results are listed in the table below and the laboratory report is in Appendix B. Rough&Ready Island 8 Tetra Tech,Inc. Revised Draft Work Plan November 18, 1998