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SC&D Boyett Petroleum 419 South Main Street October 27, 1999 Manteca California Page. 4 3.4 Soil Sampling P g The soil samples were taken using a California Modified Split Spoon sampler with brass liners. The sampler will be driven continuously by a wire line hammer. The laboratory samples did not have head space and were immediately sealed in their liners using Teflon® lined plastic caps. The remaining sample was removed from its liner and used as an aide to the on-site professional in logging the material at that depth. Soil samples collected for analysis were analyzed using EPA Method 8015 modified for total petroleum hydrocarbons in the gasoline range, EPA Method 8020 for BTX&E compounds and EPA Method 8260 for oxygenates. The minimum detection limits used for each analyte was .005 mg/kg for BTX&E, and 2.5 mg/kg for gasoline. Analyses were conducted by California Laboratory Services, Inc., a State-certified laboratory in Rancho Cordova, California. 3.5 Groundwater Sampling A travel blank provided by the laboratory accompanied the sample vials from the time they were picked up from the lab to the time they were delivered to the lab. This travel blank is listed on the Chain of Custody but will be analyzed only if all samples contain the same contaminants. All sampling equipment including the pump, bailer, and cables, used by sampling personnel, was disassembled and cleaned prior to commencement of sampling. These procedures were also followed between each well, sampling point, and at the end of the sampling day. De-ionized or organic-free water (also provided by the laboratory) was then introduced into the pump or bailer as a final stage of cleaning. Immediately prior to sampling, water levels and well depth measurements were taken in all wells at the site. Each well was evacuated using a stainless steel bladder pump which did not introduce air into the water column. The pH, temperature, and electrical conductivity of the water was monitored as the well was evacuated. These parameters are noted on a field log (Appendix E and Table 3). Instruments calibrated to known standards will be used to monitor -� these parameters.