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ENVIRONMENTAL INVESTIGATION REPORT <br /> Unocal Service Station No 5886 <br /> 2701 West March Lane <br /> Stockton,Califomta <br /> Delta Project No D095-066 <br /> ' Page 10 <br /> ' The concentrations of TPH as diesel detected above the Iaboratory's limits of detection (50 gg/L) in <br /> ground water samples ranged from 56 to 1,000 uglL Figure 8 (TPH (Diesel) Concentrations in Ground <br /> ' Water) shows the location of each Geoprobe sampling point and the associated TPH as diesel <br /> concentration detected in each ground water sample A tabulation of the analytical results from the <br /> ' ground water samples collected from the Geoprobes is presented in Table 5, Geoprobe Ground Water <br /> Sample Analytical Results Copies of the laboratory analytical reports and chain-of-custody <br /> ' documentation are presented in Appendix C <br /> ' 4.5 New Canopy Footmg Sam tiin <br /> On September 27, 1995, in the presence of SJCEHD, soil was excavated and soil samples collected from <br /> the areas of the new canopy footings The excavations were dug to an approximate depth of seven to <br /> eight feet bsg in preparation for the installation of the metal supports and associated concrete The <br /> locations of the three new footings with respect to the previous site features is shown on Figure 9, New <br /> Canopy Footing Soil Sample Locations <br /> ' One soil sample was collected from the base of each of the northern and center footing locations <br /> Samples were collected using the on-site excavator as described in Appendix B Two soil samples were <br /> ' collected from the southern footing One sample was collected from the base and the second sample was <br /> collected from the eastern sidewall The additional sidewall sample was collected at the request of <br /> ' SJCEHD at a depth of approximately 6 feet bsg because what appeared to be impacted soil was observed <br /> The location of the four soil samples is presented in Figure 9 <br /> 1 <br /> 4 5 1 New Canopy Footing Sampling Analytical Results <br /> Each soil sample collected from the new canopy footing areas was submitted to Sequoia for chemical <br /> analyses of TPH as gasoline and TPH as diesel using EPA Method 8015 Modified and BTEX using EPA <br /> ' Method 8020 Four soil samples were submitted for analyses <br /> RPT160 SJS <br />