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Onsite and Offsite Assessment Report 4 i The Southland corporation,2725 Country Club Boulevard Stockton California November 30 1998 2.2 Soil Borings On September 29 and October 2, 1998, Fluor Daniel GTI supervised the drilling of 17 soil borings (OSGP1 -6 on the Patmon Property and GP-7-17 on the Southland site)to depths of 20-30 feet BGS utilizing direct-push drilling techniques(Figure 2). Drilling was conducted using a truck-mounted direct-penetration GeoprobeTm rig at the locations shown on Figure 2. The sampling rig drives 1.54nch-diameter by 4-foot-long stainless steel barrels lined with 14nch-diameter by 64nch-long brass sample tubes at each location. The sampling equipment was steam cleaned prior to sampling the soil at each interval (steam-cleaning water was stored at the Southland site pending disposal by a licensed waste hauler). Upon completion, each borehole was �. backfilled with bentonite/cement slurry, and patched at grade with asphalt patch. .� 2.3 Soil and Groundwater Sampling Soil samples were collected from borings at the Patmon Property at depths of 4,6, and 8 feet below �. grade. Soil samples were collected at the Southland site at 5-foot depth intervals beginning at 5 feet BGS. All of the soil samples collected from the Patmon Property were submitted for analysis on a rapid turnaround basis. Samples collected from 15 feet below grade on the Southland site were submitted for analysis on a rapid turnaround basis. Each soil sample was screened for hydrocarbon vapors using a photo ionization detector(PID). Soils encountered during drilling were logged using the Unified Soil Classification System by a Fluor Daniel GTI field geologist,working under the supervision of a California registered geologist. One sample tube .. from each sampling interval was sealed with teflon sheets, capped,taped, labeled, placed on ice in an insulated container, and transported to a state-certified laboratory for analysis. All of the soil samples collected for analysis were analyzed for BTEX, MTBE, and TPH-G by EPA methods 80208015 modified, and for oxygenates TBA, MTBE, DIPE, ETRE, and TAME by EPA method 8260.A total of 20 soil samples collected on September 29, 1998 from the soil borings were v submitted on 24-hour turnaround (Appendix B),while the remaining soil samples were submitted on normal turnaround. Upon completion of the boreholes and following extraction of the geoprobe sampling rods, grab groundwater samples were collected from each boring. The samples were collected using a stainless steel bailer and then poured into 40-milliliter glass vials treated with hydrochloric acid. The vials were filled to zero headspace,sealed with Teflon-septum caps, labeled, placed on ice in an insulated cooler, and transported under chain of custody to a state-certified laboratory. The groundwater samples were analyzed for BTEX, MTBE and TPH-G using EPA methods 8020/8015 modified, and the oxygenates: 14117nr.rpt FLUOR DANIEL GTI