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6.0 SUBSURFACE INVESTIGATION <br /> 6.1 Soil Borings <br /> Permits to drill three shallow soil borings were approved by San Joaquin County Environmental <br /> Health Division on February 24, 1992. Copies of the soil permits are presented in Appendix E. <br /> Three soil borings were drilled using hollow-stem auger drilling techniques on February 27 and 28, <br /> 1992. The maximum depth of the borings were 30 feet. Drilling was supervised by a Groundwater <br /> Technology geologist who maintained a log of the materials encountered according to the Unified <br /> Soil Classification System. The subsurface soils encountered during drilling consisted of silt, sandy <br /> silt and silty sand. The drilling logs are presented in Appendix F. <br /> 6.2 Soil Sampling and Analyses <br /> Soil samples were field screened using a photo-ionization detector (PID). The soil samples were <br /> i collected just below ground surface and at 5-foot intervals down to total depth of the borings. The <br /> i samples were collected in brass tubes and were sealed with aluminum foil, plastic caps and duct <br /> tape, labeled and placed on ice in an insulated cooler for transport to a California-certified <br /> laboratory. Following Anheuser-Bush protocol, the soil samples were composited at the laboratory <br /> before analysis. The samples were analyzed for Appendix IX (40 CFR 264) constituents: cyanide, <br /> dioxin, herbicides, organophosphorus pesticides, polychlorinated biphenyls (PCBs), volatile and <br /> semi-volatile organics, sulfide, and metals. <br /> 9 <br /> 3 Soil cuttings were placed in 55-gallon drums, labeled and stored on site pending laboratory analyses <br /> to determine a proper disposal method. Copies of the laboratory analytical results and chain-of- <br /> custody records will be submitted to San Joaquin County Public Health Services, Environmental <br /> Health Division. <br /> "'GROUNDWATER <br /> __.:,TECHNOLOGY, INC. <br />