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i 7810 Thornton Road,Stockton,California II 4.0 SCOPE OF WORK 4.1 Soil Borings Four exploratory soil borings were drilled at the site on June 29, 1992.One soil boring(SB 1)was drilled was drilled to a depth of 47 feet. The remaining three l; ran i borings were drilled to depths n from 26 feet to 31 feet.Borehole drilling )? ranging and sampling operations were accomplished using a truck mounted hollow- stem auger drill rig. Each borehole was continuously logged for the purpose of describing the vertical variations in the soil profile encountered. The lithologic log for each exploratory boring is presented in Appendix A. Soil samples were collected at five (5) foot intervals, using a split spoon sampler fitted with three 2 x 6 inch brass tubes. The soil from one tube from each sample interval was placed into a sealed plastic bag which was allowed to reach ambient temperature. The gas collected in the headspace of the bag was then analyzed by a PID calibrated for benzene. ' One of the remaining brass tubes was capped and sealed,and placed on dry ice f in a refrigerated container. The remaining soil samples were discarded. PID readings for each sample were recorded on the lithologic log for that boring and can be found in Appendix 1. Selected soil samples were submitted to'the analytical laboratory for analysis to document lithologic changes and identify i� odors. In accordance with San Joaquin County Department of Health and Regional Water Quality Control Board (RWQCB) practices, all soil borings were completely backfilled with a grout composed of neat cement and bentonite. In addition,all soil cuttings and discarded soil samples generated by the borehole drilling and sampling activities were contained and stored on-site for future disposal. Project Number: USDO70192 Page 6 of 9 I