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Table 4-2, Analytical Results of o� Tracy,y Soil Samples, ARCO Station _[)�3, Trac}, California <br /> Aromatic Volatile Or anics, mg/k <br /> Sample depth Total Petroleum <br /> (ft below Date Hydrocarbons, <br /> Sam le Number round surface) Sampled Benzene Eth lbenzene Toluene Xylene m /k , C4-C12 range <br /> BH-I 105-11 10/10/90 <50 <50 <50 80 620 <br /> BH-2 105-11 10/10/90 <50 <50 <50 270 1300 <br /> ATR-9 95-10 10/10/90 <0 5 <0 5 <0 5 <0 5 <5 <br /> ATR-10 95-10 10/10/90 <0 5 <0 5 <0 5 <0 5 <5 <br /> ATR-12 7 8-8 4 10/10/90 <0 5 <0 5 1 <0 5 1 <0 5 <5 <br /> Regional Board <br /> Designated Levels (a -- -- 07 29 1L ()0 620 -- <br /> (a) Designated levels for the protection of groundwater as established by the RWQCB, April 1987 <br />