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I 8 July 1991 ' (GeoAudit CV 43C4. 1. 1) Page 3 of 4 ' The analytical results did not indicate ndicate the detection of TPH in the soil samples. BTE&X compounds were detected at trace levels: ' xylenes in all samples at concentrations ranging from 0. 01.1 to 0. 0076 mg/kg; toluene in Samples EBI-55 and EBl-70 at 0. 0051 and 0. 015 mg/kg, respectively and benzene in Sample EB1-70 at 0. 011 Img/kg. The analytical results are summarized in Table 1 . The laboratory I report, quality assurance/quality control and chain of custody forms are attached. CONCLUSIONS The majority of the contamination is restricted in the upper 50 feet of the soil zone. Most of this zone is sufficiently permeable to allow relatively effective vacuum extraction. Less permeable intervals were also encountered, but the detailed boring log of I• this continuously cored section will enable us to design a second extraction well to specifically target those intervals, if it is deemed necessary in the future. I Only trace concentrations of several aromatic hydrocarbons were detected in the soil samples. In general, the levels of these compounds are below the State Drinking Water Standard or do not Isignificantly exceed the standard. Upon approval from the San Joaquin County - Air Pollution Control District, the vapor extraction project will be initiated. LIMITATIONS IOur professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were mainly based on analytical results provided by an independent laboratory. Evaluations of the geologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (i.e. soil samples) and subsurface conditions may vary away from these data points. No other warranty, expressed or implied, is made as to the professional recommendations contained Iin this report. I