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April 15, 1993 Working To Restore Nature <br /> ARCO Service Station No 2076, Lodi, California <br /> Soil Borings and Soil Sampling <br /> On October 8 through 16, 1992, a geologist from RESNA observed drilling of eleven soil <br /> borings (B-9 through B-19) by Wayne Drilling Company of Lincoln, California Boring <br /> locations are shown on Plate 2 Borings were terminated at depths ranging from 36 to 63 <br /> feet below surface grade Groundwater was first encountered in borings B-16 through B-19 <br /> at approximately 54 feet below grade <br /> The geologist collected relatively undisturbed soil samples at 5-foot intervals from the <br /> ground surface to the total depth of each boring for classified and possible laboratory <br /> analyses Soil samples were identified using visual and manual methods and classified <br /> according to the Unified Soil Classification System (Appendix A) Descriptions of materials <br /> encountered are presented in the Logs of Borings (Appendix A) During drilling, a <br /> photoionization detector was used to evaluate the soil samples for hydrocarbon vapors <br /> These readings are included on the Logs of Borings Borings not converted to wells (B-9, <br /> B-10, and B-11) were grouted to the surface with a bentonite-cement slurry <br /> Cuttings generated during drilling were stored on plastic onsite Four soil samples were <br /> collected from the drill cuttings and composited into one sample by the laboratory for <br /> analyses Analytical results of this sample were used to evaluate disposal options of the drill <br /> cuttings Results of chemical analyses of soil samples collected from drill cuttings are <br /> presented in Table 5 At ARCO's request, in November 1992, Dillard Trucking, Inc <br /> removed and transported the drill cuttings to Browning Ferries, Industries (BFI) in <br /> Livermore California <br /> r • <br /> 3M-5 6 <br /> i <br />