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2 omm P <br /> 8720033A-COT-7 <br /> showed the highest concentrations. Chlorobenzene and ethylene dibromide <br /> were not identified in any of the soil samples. Petroleum hydrocarbons <br /> were identified in three samples at depths of 10.5, 20.5 and 30.5 feet in <br /> boring S-3 at concentrations ranging from 71 to 1100 ppm. Petroleum <br /> hydrocarbons exceeding detection limits w,%re not found in any other soil 14 <br /> samples. Organic lead was not detected in any of the soils tested. <br /> A; shown in Table 3, benzene, ethylbenzene, toluena, total xylenes and <br /> petroleum hydrocarbons were detected in groundwater samples from all four <br /> monitoring wells at the site. Organic lead was not detected in any of the <br /> groundwater samples. <br /> 6.0 DISCISSION <br /> Chemical components of gasoline were detected in both soil and groundwater <br /> samples from the vicinity of the Shop 10 storage tank area. Concentrations <br /> of benzene, ethylbenzene, toluene and total xylenes exceeding California <br /> Department of Health Services drinking water action (DWAI.$) were identified <br /> "? in groundwater samples from dll four monitoring wells at the site. Direct <br /> s'~ observation in the field of recovered soil and g:ouncwt�ter samples <br /> indicates some soil and water samples have a distinct hydrocarbon odor. No <br /> floating hydrocarbon free product was observed on the groundwater samples. <br /> E <br /> 7.0 RECOMMENDATIONS AND CONCLUSIONS E <br /> u <br /> Based upon WCC's field observations and the analytical results obtained to <br /> date, petroleum-related constituents are present in the groundwater and <br /> soils at the CalTrans Shop 10 fuel area. As a results, we recommend that <br /> the following steps be taken: <br /> (1) All tanks and/or lines at the site should be tes,tod for <br /> leakage and, if necessary, removed or repaired in accordance <br /> Ir with county underground storage tank regulations. <br /> t <br /> �'S <br />