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KEI-J87-0413 May 27, 1987 Page 2 native soil was taken from the pit at a depth of 10. 0 feet. Sampling was done in the presence of Mr. Doug Wilson of the San Joaquin County Department of Environmental Health. The soil sample was placed in a clean brass tube, sealed with aluminium foil and plastic caps, and stored in a cooled ice chest for delivery to Sequoia Analytical Laboratory in Redwood City, California. The subsurface soil exposed in the excavation consisted of silty sand. No odor was noted in the excavated soil. ANALYTICAL RESULTS The soil sample was analyzed for total hydrocarbons (THC--high boiling fraction) , Volatile Organic Compounds (EPA 8240) , and total oil and grease, as required by the California Regional Water Quality Control Board guidelines. The laboratory analyses show non-detectable levels of all constituents. Copies of the laboratory analyses and chain of custody form are attached to this report. CONCLUSIONS AND RECOMMENDATIONS The analytical results indicate that the concentrations of total hydrocarbons and Volatile Organic Compounds are within acceptable limits. Because of this, we recommend no further investigation at this time. Copies of this report and the attachments should be sent to the San Joaquin County Department of Environmental Health, and to the Regional Water Quality Control Board. LIMITATIONS Soil deposits and rock formations may vary in thickness, lithology, saturation, strength and other properties across any site. In addition, environmental changes, either naturally- occurring or artificially-induced, may cause changes in groundwater levels and flow paths, thereby changing the extent and concentration of any contaminants. Our studies assume that the field and laboratory data are reasonably representative of the site as a whole, and assume that subsurface conditions are reasonably conducive to interpolation and extrapolation.