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CLEARWATER <br /> G R O U P I N C <br /> Environmental Services <br /> es were <br /> samples analyzed for TPHg and BTEX with MTBE On March 23, 1999, samples were additionally <br /> y g <br /> analyzed for fuel oxygenates by EPA Method 8240B <br /> 2 5 Sensitive Receptor Survey <br /> In order to identify possible sensitive receptors that could be impacted by the subject release, a review <br /> of all available well driller's reports at the California Department of Water Resources (DWR) was <br /> conducted by Clearwater personnel for an area based on a 2,000-foot radius around the site <br /> Additionally, local topographic maps were reviewed for any surface water bodies that could <br /> potentially be impacted <br /> 3 0 RESULTS <br /> 31 Subsurface Lithology <br /> Subsurface lithologies encountered during drilling consisted predominantly of silty clay, organic rich in <br /> places, with subsidiary clayey sand with gravel noted in MW-4 at 3 feet bgs The water table was <br />�. encountered at approximately 9 5 feet bgs Lithologic correlation between borings is displayed <br /> graphically on the geologic cross-sections presented as Figures 3A and 3B Detailed soil sample <br />' descriptions are presented in Appendix B <br />' 3 2 Soil Sample Analytical Results <br /> A total of nine soil samples collected from borings MW-4, MW-5 and MW-6 were analyzed <br /> Concentrations of TPHg were detected in borings MW-4 and MW-6 The highest concentration of TPHg <br />' (3 5 mg/kg) was detected at 10 5 feet bgsSB wever, laboratory notations indicate that the <br /> chromatogram pattern of this sample does not match the gasoline standard No other analytes were <br />' detected in this sample In all other samples, no TPHg, BTEX, or MTBE were present in concentrations <br /> exceeding method detection limits,except the 19-foot bgs samples from MW-5 and MW-6 Sample MW- <br /> 1 5-19' contained 0 035 mg/kg of benzene TPHg was not detected in thus sample Sample MW-6-19' <br /> contained 19 mg/kg of TPHg Benzene was not detected in thus sample <br />' Soul sample analytical results are summarized in Table 1 and shown on Figure 4 The certified <br /> laboratory analytical report is presented with the chain of custody in Appendix D <br /> 1 <br /> i <br /> 1 <br /> 1 C-178 WELL INsr RPT 4 May 7, 1999 <br />