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Preliminary Investigation and Evaluation Report— Calrfornra Cedar Products <br /> Cross-Section B-B' illustrates that the diesel occurs in elevated concentrations in <br /> the sand to a depth of 18 feet and decreases in concentration to 450 mg/Kg at 18 <br /> feet in B3 Diesel was detected at 750 mg/kg at 23 feet in B3 <br /> Groundwater is illustrated to occur at 19 feet bgs in both geologic cross-sections <br /> The occurrence of first ground water above the clay layer indicates water table or <br /> perched conditions No free-floating product was observed in the soil samples or in <br /> the water samples The detection of diesel below present standing groundwater <br /> indicates variable water levels causing a localized smear zone from approximately <br /> 19 to 24 5 feet bgs <br /> 5.0 Summary and Conclusions <br /> The site investigation performed on 12 September 2002 at the California Cedar <br /> Products Stockton facility characterized the soils beneath the site, and identified <br /> TPH-d in the soil and groundwater The following are key findings of the <br /> investigation <br /> 51 Soils and Aquifer Materials <br /> • Poorly graded fine sands (SP) colored olive gray to light olive brown comprise <br /> the soil materials to the unsaturated zone, <br /> Poorly graded fine sands (SP) colored olive gray to light olive brown occur to <br /> 24 5 feet bgs, and clay (CL) colored light olive brown occurred to the depth <br /> explored at 30 feet bgs in the saturated zone, <br /> bgs, <br /> • Groundwater was encountered at a depth of approximately 19 feet g , <br /> RAS Consulting <br /> 9 <br />