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V <br /> 112 i3 <br /> Work Plan to Excavate Gasoline Tank Cavity December 10, 1990 <br /> ARCO Service Station No. 6020, Manteca, California AGS 30055-2W <br /> TABLE 1 <br /> CONCENTRATIONS OF HYDROCARBONS IN SOIL SAMPLES <br /> ® <br /> ARCO Service Station No. 6020 <br /> 1.711 Yosemite Avenue <br /> Manteca, California <br /> (Page 2 of 2) <br /> Sample Ethyl- Total organic <br /> Number TPHg Benzene Toluene benzene Xylenes Lead <br /> S-15-B6 2.07 <0.050 <0.06 <0.050 0.08 NA <br /> S-20-B6 3.73 <0.050 0.050 <0.050 0.05 NA <br /> S--15-B7 <2.0 <0.050 <0.050 <0.050 <0.050 NA <br /> S-20-B7 <2.0 <0.050 <0.050 <0.050 <0.050 NA <br /> S-0824-IA-D <1.0 <0.050 <0.050 <0.050 0.034 <0.5 <br /> Results in parts per million (ppm) <br /> TPHg = Total petroleum hydrocarbons as gasoline <br /> l < = Less than the detection level for the analytical <br /> methods used <br /> NA = Not analyzed <br /> S-0824-IA-D = Composite sample <br /> Sample designation: <br /> S-15-B1 <br /> -- Boring number <br /> Depth of sample <br /> Soil <br /> On the basis of this previous work, we concluded the following: <br /> 0 Gasoline does not appear to be present in the sail near the existing and <br /> proposed tank cavities in concentrations warranting rernediation. <br /> 0 Ground water may be encountered if the excavation of the existing tank cavity <br /> exceeds 18 feet. <br /> 5 <br /> ,4 VA00' 060Syst61nS <br />