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• in KLEINFELDER these probe borings usually dropped off markedly at depths greater than 10 feet, with PID readings ranging from approximately 5 to 50 ppmv. Lower PID readings and no petroleum odors or soil discoloration was noted in the southern most portion of the footprint and south of the rupture point. PID readings in these areas generally ranged from 1 to 10 ppmv. Based on field observations and PID readings petroleum impacted soil was impacted at the greatest depths northeast and east of the rupture point and north of the Chevron pipeline. Obvious petroleum impacted soil was noted in this area at estimated average depths ranging from 8 to 12 feet bgs. Obvious petroleum impacted soil noted northwest, immediately west and southwest of the rupture point extended generally from surface to 5 feet bgs. For estimated limits and depths of petroleum impacted soil please refer to Plates 3 and 4. �I No odors, discolored soil or significant PID readings were noted from perimeter deep pushprobe borings G2, G3 or G4. For additional specific details refer to geoprobe soil logs located in Appendix A. Groundwater samples were obtained from four deeper pushprobe borings (GI through G4). The groundwater samples were collected using a positive displacement check valve attached to new polypropylene tubing. The positive displacement was generated manually using a piston-like motion. New tubing was used at each sampling location. Slotted PVC was placed within each of the four push probe boreholes to help decrease turbidity and facilitate collection of the groundwater sample. The groundwater samples were transferred into pre-cleaned laboratory grade bottles. Slow recovery was noted while attempting to collect groundwater samples from pushprobes G3 and G4. ] 4.3 SAMPLE HANDLING AND CHEMICAL ANALYSES After collection, the soil and water samples were labeled, logged on a chain-of-custody form, and immediately stored in an iced cooler. The samples were transported in a chilled ice chest under chain-of-custody control to Kleinfelder's office and to Alpha Laboratories of Sparks, Nevada �1 (Alpha). Alpha is certified by the California Department of Health Services to perform the requested analyses. 1 A total of twenty-two 4-point composite soil samples, 26 discrete soil samples from the pushprobes and four groundwater samples were submitted for the following analyses: • Total Purgeable Petroleum Hydrocarbons as referenced to gasoline [TPH-G] including Benzene, Toluene,Ethylbenzene, Xylenes [BTEX] by EPA Method 8015M/8260 • Total Extractable Petroleum Hydrocarbons as referenced to diesel and oil [TPH-D and TPH-O]by EPA Method 8015M • Silica Gel Cleanup for extractable soil analyses by EPA Method 3630M Tables 1 and 2, located under the"Tables"tab, summarize the soil and groundwater analytical results, respectively. 44843.T03/ST04R1025 Page 8 of 16 Copyright 2004 Kleinfelder,Inc. August 6,2004