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C <br />The action level for total petroleum hydrocarbons (TPH) as diesel fuel is 1,000 mg/kg or <br />parts per million (ppm) for this project. The applicable action levels for benzene, toluene, <br />ethylbenzene, and total xylenes (BTEX) are 11, 300, 900, and 750 gg/kg, respectively. No <br />action limits have been defined by the State of California for methyl tertiary butyl ether (MTBE) <br />in soil. These action levels are based on the LUFT manual, depth to groundwater at the site, and <br />r site specific soil type (SWRCB 1989). Although sediment type at the site is predominantly silt, <br />sand was used in a conservative approach to determine the action levels. <br />C <br />11 <br />