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Table 1. Summary of Laboratory Analysis From Extraction System, <br /> ARCO Station 2133, Stockton <br /> TPH/gas and volatile organics, µg11 <br /> EPA Method 8015/8020/602 Trace metals, mgll <br /> Date pH (field <br /> sampled measurement) Benzene Toluene Ethylbenzene Xylenes TPH as gas Cadmium Chromium Copper Lead Nickel Zinc <br /> 6/15/94 675 28 7 4 4 8 52 440 <0 010 <0 010 0 036 <0 050 1 <0 025 0 093 <br /> 1 <br />