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�y � <br /> 7 <br /> KEI-J87-0414 <br /> May 27, 1987 <br /> Page 2 <br /> made of fiberglass and appeared to be in good condition. The <br /> depth of excavation was approximately eight feet. One sample of <br /> native soil was taken from the pit at a depth of 10. 0 feet, in <br /> the presence of Mr. Doug Wilson of the San Joaquin County <br /> Department of Environmental Health. The soil sample was placed <br /> in a clean brass tube, sealed with aluminium foil and plastic <br /> caps, and stored in a cooled ice chest for delivery to Sequoia <br /> Analytical Laboratory in Redwood City, California. <br /> The subsurface soil exposed in the excavation consisted of silty <br /> sand. No odor was noted in the excavated soil. <br /> ANALYTICAL RESULTS <br /> The soil sample was analyzed for total hydrocarbons (THC--high <br /> boiling fraction) , volatile Organic Compounds (EPA method 8240) , <br /> and total oil and grease, as required by the California Regional <br /> Water Quality Control Board guidelines. The laboratory analyses <br /> show non-detectable levels of THC and volatile organic compounds. <br /> Gravimetric waste oil level was 55 parts per million (ppm) . <br /> Copies of the laboratory analyses and chain of custody form are <br /> attached to this report. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The analytical results indicate that the concentrations of total <br /> hydrocarbons and Volatile Organic Compounds are non-detectable, <br /> and therefore are within acceptable limits. The concentration of <br /> gravimetric waste oil is also within acceptable limits. Because <br /> of this, we recommend no further investigation at this time. <br /> Copies of this report and the attachments should be sent to the <br /> San Joaquin County Department of Environmental Health, and to the <br /> Regional Water Quality Control Board. <br /> LIMITATIONS <br /> Soil deposits and rock formations may vary in thickness, <br /> lithology, saturation, strength and other properties across any <br /> site. In addition, environmental changes, either naturally- <br /> occurring or artificially-induced, may cause changes in <br /> groundwater levels and flow paths, thereby changing the extent <br /> and concentration of any contaminants. Our studies assume that <br />