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volatile halocarbons (EPA 8010) and 17 CCR metals (CAM 17) . <br /> 3.3 Logging <br /> Auger returns and soil from the second brass tube were screened for <br /> the presence of organic vapors using a PID. The soil was then <br /> described in accordance with the Unified Soil Classification System <br /> (see Boring Logs) . All borings were backfilled using concrete- <br /> bentonite slurry for the entire depth. <br /> ' 4.0 FINDINGS <br /> 4.1 Stratigraphy <br /> The borings penetrated brown to dark brown, silty sands and sandy <br /> ' silts. Silty clay was encountered in the upper ten feet on the <br /> southern portion of the property. A slight hydrocarbon odor was <br /> observed in soil sample B5-10 (10 foot depth) . However, no volatile <br /> organic vapors were detected by the PID in any of the samples. <br /> ' 4.2 Groundwater <br /> M Depth to groundwater at the site is currently 70 to 75 feet. <br /> However, seasonal high groundwater (spring 1986) was estimated to <br /> be at depth of approximately 40 feet (San Joaquin County Flood <br /> Control Map) . Groundwater was not encountered during this <br /> assessment. <br /> During drilling, a sewage odor was noted in Boring #4 at depths <br /> ' between 25 and 35 feet. Perched water was also noted between 25 and <br /> 30 feet. Information obtained from the San Joaquin Local Health <br /> District indicates that a septic pit may have been located in the <br /> ' area of Boring #4 . The presence of an abandoned septic pit may <br /> account for the sewage odor and perched water. <br /> 4.3 Laboratory Results <br /> ' TPH as diesel; TPH as motor oil; and benzene, toluene and <br /> ethylbenzene were not detected in any of the soil samples. TPH as <br /> ' gasoline was detected in sample B7-10 at 12 mg/kg (ppm) and xylenes <br /> were detected in sample 89-10 at 0. 056 ppm. No TPH or xylenes were <br /> detected in any other soil sample. The analytical results are <br /> summarized in Table 3 . The laboratory report and chain of custody <br /> are attached in Appendix A. <br /> The stockpiled soil contained no detectable concentrations of TPH <br /> as gasoline or BTE&X. TPH as diesel was present in the stockpiled <br /> soil at 28 ppm. Of the halogenated volatile organic compounds <br /> (HVOC's) only Dichloromethane was detected (0. 0053 ppm) . None of <br /> the CAM 17 metals exceeded the Title 22 Total Threshold Limit <br /> Concentrations (TTLC) . The laboratory report and chain of custody <br /> ' 3 <br />