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l _ Geological Technics Inc. Page 3 Interum Soil Investigation Project No.750.2 October 2,2003 Soil cuttings were placed in DOT-17 55-gallon drums and stored on site until their disposal can be arranged. 2.2 Soil Sampling Procedure On September 5, 2003, Gregg and GTI personal mobilized to the City of Escalon (Former 1 Arco) site.. A GTI geologist collected soil samples at five-foot intervals and in a log from.the soil borings. The samples; were gathered in 6.0-inch brass liners using a 2.0- inch modified California split spoon sampler. The middle 6.0-inch brass liner was selected for laboratory analyses. The ends were covered with Teflon sheets and sealed with plastic caps. The brass liners and plastic caps,were washed with an Alconox solution and double rinsed prior to use. The sampling technician wore disposable gloves while collecting all samples. t j t L Three soil samples from SB-1 and five soil samples from SB-2 were submitted for i laboratory analysis. A screening process was used to gather information through field observations. The field screening included: • Sediment type, especially grain size and clay content • Moisture content • Visible evidence of containination (i.e., color change due to reduction of iron or ' discoloration from hydrocarbons and other pollutants) • Odor (OVM was not functioning and field observations were noted relating to odor in soil samples) Details on the geology encountered during the well installation, as well as the field observations, are included in Section .3.2, Geology and Field Observations and on the Boring Logs in Appendix B. 2.3 Soil Laboratory Analyses The soil samples collected on September 5, 2003, were delivered to Sherwood Labs p P (California ELAP No. 1400), of Hilmar,.California, for the following analyses: • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020 • Gasoline range petroleum hydrocarbons (TPH-Gasoline) by EPA method 8015(m) ` • Fuel Oxygenates by EPA method 8260 (MtBE, RIPE, ETBE, TAME, TBA) • Total Lead (for soil disposal purposes) The detection limits for these compounds are listed in the laboratory data sheets included in Appendix and summarized in Table 1 of Appendix A. A Chain of Custody was ppendi C s pp y completed for all samples collected and tracked to ensure sample integrity. i The laboratory data were submitted electronically to GeoTracker as required under AB2886 on September 26, 2003. The confirmation number for the electronic submittal is 2975723723. I