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GeoStrategies Inc. <br /> UNOCAL Corporation <br /> December 15, 1993 <br /> Page 3 <br /> FIELD ACTIVITIES <br /> Eight exploratory soil borings (U-A through U-H) were drilled on October 1 , <br /> 1993, using a truck-mounted hollow-stem auger drilling rig The borings <br /> were drilled to depths ranging from 4 5 to 31 5 feet bgs Due to drilling rig <br /> accessibility problems, boring U-F was hand dug, and the sampling device <br /> advanced with a hand sledge <br /> Soil samples were collected at five foot intervals using a split-barrel <br /> sampling device fitted with clean stainless steel tube liners A GSI geologist <br /> observed the drilling, described the soil samples using the Unified Soil <br /> Classification System (ASTM 2488-84) and Munsell Soil Color Chart, and <br /> prepared a lithologic log for each boring The exploratory boring logs are <br /> presented in Appendix B <br /> Upon completion of drilling, the borings were backfilled with a neat cement <br /> and bentonite slurry Mr Michael Collins of the SJCEHD was present to <br /> observe slurry placement <br /> Soil Sampling <br /> Soils collected from each sampling interval were used to perform head- <br /> space analysts in the field for the presence of organic vapors The test <br /> procedures involved removing soil from the tip of the sampling device or a <br /> stainless-steel liner into a clean glass far, and immediately covering the far <br /> with aluminum foil secured under a ring-type threaded lid After <br /> approximately twenty minutes, the foil was pierced and the atmosphere <br /> within the jar analyzed using an Organic Vapor Meter (DVM) <br /> photoionization detector Head-space analysis results are presented on <br /> each of the appended exploratory boring logs (Appendix B) <br /> These field procedures are performed and recorded as reconnaissance <br /> data GSI does not consider field screening techniques to be verification of <br /> 782702-3 <br />