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5 SOIL INVESTIGATION <br /> 5.1 March 31,2004 Sampling of Soil Probes DP1—DP3 <br /> On March 31, 2004, Fisch Environmental Exploration (Valley Springs, CA)advanced and sampled three <br /> " direct-push soil probes (DP1—DP3)down to 9.5 feet to assess the lateral and Vertical extent of soil and <br /> groundwater contamination beneath the fuel dispensers and WOT piping required by the EHD NOR cover <br /> letter(Appendix B). Mr. John Woodruff, Registered Geologist of PG&E TES, logged the soil probes. Mr. <br /> Ga Pforr, Project I <br /> ryManager of PG&E Corporate Real Estate hel ed coordinate the project.p p p � Ms. Margaret <br /> Lagorio of EHD witnessed the sampling. ,Figure 4 shows the locations of the soil probes. Soil probe DP1 <br /> was made about 2 feet west of the WOT piping; DP1 was about 4 feet south of the center of the diesel <br /> dispenser; and DP2 was about 4 feet north of the center of gasoline dispenser UNL1. . <br /> Soil samples were collected using the Geoprobe Macrocore sampler. Organic vapors in three selected <br /> soil samples from each probe were measured with a photoionization detector(PID). The completed probe <br /> holes were grouted to the surface with lean cement. Appendix C contains the probe logs of stratigraphy, <br /> sample information, and PID readings. <br /> r i <br /> 5.2 Geologic Conditions <br /> i <br /> ✓ Results of the soil probe exploration indicate that the site is underlain by'medium dense clayey sand k <br /> alluvium. Fill material consisting of reworked native soil was encountered in soil probe DP2 to a depth of 4 <br /> feet. r <br /> 5.3 Field Evidence of Petroleum Hydrocarbon Compounds <br /> f � <br /> Product odor was not observed in any of the soil recovered from any of the probes. None of the collected k <br /> soil samples exhibited unusual discoloration or free-phase PHC liquids. None of the PID readings,which i <br /> ranged from 0.6 to 1.6 parts per million (ppm), exceeded backgrounid concentrations. <br /> t <br /> 5.4 Analytical Results of Soil Samples F <br /> Three soil samples from each probe, collected at depths of 5, 7, and 9 feet', were analyzed.for the <br /> following COPC: DP1 samples for PCE; DP2 samples for diesel; and DP3 samples for gasoline, BTEX, <br /> J <br /> and five fuel oxygenates including MTBE. None of the COPC was detected in any of the samples. <br /> Table 2 summarizes the results. Appendix D contains the analytical laboratory report and chain of I <br /> custody. l <br /> :i <br /> i <br /> I' E <br /> I <br /> E <br /> s 402.331.04.30 4 <br />