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II 2 MARCH 2002 SITE INVESTIGATION PROCEDURES The March 2002 site investigation included driving six Geoprobe probeholes, and completing one groundwater monitoring well, one air sparging well and one soil vapor extraction well Soil and groundwater samples were collected for laboratory analysis Prior to performing drilling activities, PSC obtained applicable County and City of Stockton permits as required Permits are contained in Appendix A 21 Geoprobe Borings PSC utilized Advanced Geoenvironmental Inc (AGE) of Stockton to drive three soil probeholes(PH-3 through PH-5) at the Site to assess the extent of petroleum-impacted soil in the vicinity of the former UST AGE also drove three additional offsite Geoprobe "hydropunch" probeholes (PH-6 through PH-8), in downgradient locations relative to the former UST, to further assess the extent of petroleum-impacted groundwater Probehole PH-5, located south of the former UST, was the initial boring f driven on March 14, 2002 Probehole PH-5 was driven to a total depth of 49 feet Four-foot long continuous cores, obtained in acetate liners, were collected from 5 feet to the final depth to evaluate subsurface stratigraphy Subsurface stratigraphic conditions are more fully described in Section 3 2 of this report Portions of each PH-5 core (the most obviously impacted if evident) were selected, placed in a zip-lock bag, and subsequently screened for organic vapors with a photoionization detector (PID) Geologic Field Observation logs and PID measurements are contained in Appendix A Probeholes PH-3 (north of the UST) and PH-4 (west of the UST) were sampled less continuously than PH-5 Generally, two-foot long soil cores were initially obtained at a depth of 24 to 26 feet, and then subsequently about every five feet from 34 feet to Te termination depth PH-3 was driven to 55� feet and PH-4 was driven to 50 feet Soil sample cores were also screened with the PID �y Soil samples for laboratory chemical analysis were collected from probeholes PH-3 through PH-5 at various depths Samples were collected in clean brass tubes, which were capped, labeled, and stored in an iced chest for chain-of- custody delivery to Acculabs analytical laboratory in Davis, California Soil samples were analyzed for BTEX, TPHg and oxygenate compounds Soil sample analytical results are discussed in Section 3 2 7 March 2002 Subsurface Site Investigation 1717 South Center Street-Stockton,California Prepared by Philip Services Corp H VFNV\624001325121382EGkProjects\StockCentlmarch2002inymigauon ci c May 14 2002