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Once the tracks have been removed, the ballast will be removed by an excavator and loaded into <br /> a dump truck and placed onto a 20-mil liner in the staging area. The 20-mil liner is sufficient to <br /> contain the ballast because the rocks are rounded, not jagged-edged. A lined, bermed area <br /> (decon pad) will be created adjacent to the staging area to clean the ballast. A loader will then <br /> pick up impacted ballast and drive to the decon pad where the ballast will be cleaned with a low- <br /> flow, high-pressure steam cleaner. Once the ballast has been cleaned, it will be placed onto a 20- <br /> mil plastic liner in a clean area of the staging area, segregated from the non-steam cleaned <br /> ballast. Water from the decon pad will be collected, analyzed for TPH hydraulic oil and diesel <br /> by Associated Laboratories located in Orange, California. Associated Laboratories is State <br /> certified and USACE certified. <br /> After the ballast has been removed, the excavator will remove soil from the two excavations to a <br /> total depth of 4 feet below ground surface (bgs), removing approximately 2 feet of soil. The <br /> depth has been determined based upon the previous investigation in June 1998 in which the <br /> samples analyzed at 4 feet bgs were all below 50 ppm for TPH hydraulic oil. In addition, it is <br /> not expected that a surface spill of hydraulic oil (<100 gallons) would migrate into the <br /> subsurface below 4 feet bgs. The soil will be segregated based upon visual and odor <br /> observations into clean and contaminated piles. Clean soil will be placed next to the excavation <br /> on a 20-mil liner to be used as backfill if the immunoassay test and fixed laboratory results <br /> confirm the soil is clean. Clean soil will be tested at a frequency of 1 sample per 50 cubic yards <br /> (approximately 70 tons) by the immunoassay test for both diesel and hydraulic oil and also sent <br /> to the fixed laboratory for confirmation. The immunoassay test kit has a detection limit of 13 <br /> ppm for diesel and 10 ppm for hydraulic oil. <br /> Rough&Ready Island 18 Tetra Tech,Inc. <br /> Revised Draft Work Plan November 18, 1998 <br />