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1 <br /> 2 0 INVESTIGATION SUMMARY <br /> 1 Viro each <br /> nex Inc (San Leonardo, California) was contracted to install direct-push borings at <br /> investigation area in a location approved by San Joaquin County Boring UST B1 was drilled <br /> approximately 15 feet east and three feet south of the southeast corner of the Tare Lab building <br /> Boring BNK1 was located approximately 60 feet north and 30 feet east of the northwest corner <br /> of the Bunker <br /> Figure 1 presents the approximate locations of the soil borings and the UST B and Bunker sites <br /> The probe borings were continuously sampled in acetate liners and logged by a California <br /> 1 Registered Engineer using the Unified Soil Classification System (USCS) Samples were field <br /> screened for headspace total organic vapor (TOV) concentrations using a photo-ionization <br /> detector (PID) The PID was calibrated to a factory-prepared isobutylene standard Boring logs <br /> for these two borings including Total organic vapor (TOV) readings for each sample interval are <br /> provided in Appendix A The highest TOV reading from the UST 61 borehole was 9 5 parts per <br /> million (ppm) for the sample from 24 feet below ground surface (ft-bgs) The highest TOV <br /> reading from the BNK1 boring was 226 parts per million (ppm) for the sample from 15 feet <br /> below ground surface (ft-bgs) <br /> ' Soil samples from depths of five and 10 feet from each boring were selected for submittal to <br /> BSK Analytical Laboratories of Fresno, California The soil samples were collected in acetate <br /> liners Teflon tape was placed over both ends of each sample and the samples were placed on <br /> ice in an opaque cooler <br /> Following soil sample collection a temporary piezometer was installed in each probe boring and <br /> a groundwater sample was collected The groundwater samples were collected using a <br /> 1 stainless steel bailer placed in the temporary piezometer The groundwater samples were <br /> placed directly into sample containers provided by the laboratory The groundwater samples <br /> were then placed on ice in an opaque cooler pending shipment to the laboratory <br /> Site B soil and groundwater samples were analyzed for total petroleum hydrocarbons as <br /> gasoline range organics (TPH-GRO) using EPA Method Modified 8015, and for benzene, <br /> ' ethylbenzene, toluene, and xylenes (BETX), five oxygenates and 1,2 DCA analytes using EPA <br /> Method 8260 Bunker samples were analyzed for total petroleum hydrocarbons as diesel range <br /> organics (TPH-DRO) using EPA Method Modified 8015, Hydrocarbon Oil & Grease using EPA <br /> Method SM552OF and for BETX using EPA Method 8260 <br /> Following collection of soil and groundwater samples, the probe borings were plugged and <br /> abandoned using a pressure grout of neat cement from total depth to ground surface <br /> 2-1 <br /> H 1ProleclslSpreckalslTracyVinal1I4RPT doc <br />