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Metal Detection Original Data Adjusted Data via Log Max. Background Frequency Q-tg/l) Transformation (yg/1) ( gel) Level Screening Mean Std Mean Std 11GIVI) Cadmium 40r0' --- --- --- --- 2.6 2.4 Chromium 33% --- --- --- --- 31.6 27.2 Cobalt 18% --- --- --- --- 12.8 9.86 Copper 59% 33.3 66.1 31.7 61.8 356 217 Iron 100% 3,876 5,114 4,048 7,152 28,300 25,504 Lead 69% 5.8 9.6 5.64 8.67 60.2 31.7 Manganese 96% 216.0 382.0 230.0 571.0 2,360 1,944 Mercury 10% --- --- --- --- 1.1 0.48 Molybdenum 49% --- --- --- --- 52.4 46.8 Nickel 43% --- --- --- --- 78.2 32.2 Selenium 8% --- --- --- --- 49.7 3.15 Silver 2% --- --- --- --- 1.6 1.60 Thallium 18% --- --- --- --- 6.3 5.30 Vanadium 88% 47.4 42.8 50.3 57.7 195 223 Zinc 86% 26.3 34.5 27.0 40.7 179 149 Railroad ties that are discolored or odorous will be tested for pentachlorophenol and creosote by TCLP (toxicity characteristic leaching procedure) prior to disposal. If the soil and/or railroad ties are contaminated, but deemed non-hazardous, then they will be transported and disposed at the Forward Inc. Landfill, located at 999 South Austin Road in Manteca, California, southeast of the site. If the soil and/or railroad ties are deemed RCRA hazardous, then they will be transported to Chemical Waste Management's Class I facility at located at 35251 Old Sky Line Road, Kettleman City, California. Before transporting the soil or railroad ties to a disposal facility, manifests will be generated and sent to the DLA Project Manager, Mr. Jim Peck, for his signature. Other investigative derived waste will include the 20-mil liners, decontamination water from the hand augering of three samples, water from the steam cleaning of the ballast, gloves, and miscellaneous construction waste. The decontamination water will be disposed with the soils. The water from the ballast washing activities will be analyzed for TPH diesel and hydraulic oil and disposed accordingly. The 20-mil liner, gloves, and other construction debris are considered general construction waste and will be disposed at a municipal landfill. Rough&Ready Island 3 Tetra Tech,Inc. Final Work Plan Addendum December 11, 1998.