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Surface Water and Well Survey <br /> and CPT Investigation Report <br /> C A M B R I A BP Oil Site No 11193 <br /> • Stockton, California <br /> December 16, 1999 <br /> Groundwater Depths Groundwater was encountered in the borings at approximately <br /> 13 5 feet bgs <br /> Soil Sampling Method Soil was sampled at approximate 5-foot intervals in borings CB-1 <br /> through CB-6 <br /> Water Sampling Methods Groundwater samples were collected from borings CB-1, CB-2, CB-4, <br /> CB-5 and C13-6 at 16-17 feet bgs and at 29-30 feet bgs Groundwater <br /> samples were collected at 16-17 feet and 34-35 feet bgs in <br /> boring CB-3 The samples were collected using a Hydropunch device <br /> Chemical Analysis Selected soil and groundwater samples were analyzed for GRO using <br /> modified EPA Method 8015, and benzene, toluene, ethylbenzene, <br /> xylenes (BTEX), MTBE and TAME using EPA Method 8260 <br /> Analyses were performed by Southern Petroleum Laboratories, Inc of <br /> • Houston, Texas (see Tables 2 and 3) Analytical reports are presented <br /> in Appendix E <br /> CPT Method Stratigraphy was evaluated using cone penetrometer test equipment <br /> and interpreted using CPTINTR 1 version 3 04 based on the methods <br /> of Robertson and Campanella, 1983 (see Appendix D) <br /> Backfill Method Borings were backfilled with cement grout to match the existing grade <br /> Groundwater Sampling Blaine Tech Services of San dose, California sampled the site wells <br /> during the monitoring event on October 14, 1999 Samples were <br /> analyzed for GRO by modified EPA Method 8015, and BTEX and <br /> MTBE by EPA Method 8020 (see Table 4) Additional information <br /> will be provided by Blame under separate cover <br /> • <br /> 7 <br />