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. 22 August 2003 <br /> AGE-NC Project No. 02-0896 <br /> Page 5 of 5 <br /> 5.0. CONCLUSIONS <br /> Laboratory analysis of soil samples collected from boring P1 detected petroleum hydrocarbon- <br /> impacted soil at between 20 and 40 feet bsg at maximum concentrations of 11,000 mg/kg TPH-g, <br /> 3.1 mg/kg toluene, 11 mg/kg ethylbenzene and 600 mg/kg xylenes. <br /> 6.0. RECOMMENDATIONS <br /> ' Based on the results of this investigation,AGE recommends additional site assessment to define the <br /> lateral and vertical extent of contamination.Due to refusal encountered by GeoProbe at 50 feet bsg, <br /> prior to reaching ground water depth, auger-drilling techniques should be utilized to advance soil <br /> borings to collect soil and ground water samples and,if necessary,to install ground water monitoring <br /> wells. <br /> 7.0. LIMITATIONS <br /> • Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities. The findings were based upon <br /> analytical results provided by an independent laboratory. Evaluation of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points (ie. soil samples) and subsurface conditions may vary away from these data <br /> points. No other warranty, expressed or implied, is made as to the professional interpretations, <br /> opinions and recommendations contained in this report. <br /> 1 <br /> 8.0. REFERENCES <br /> ' Jennings, C.W. (Compiler), 1977, Geologic Map of California; Map No. 2. <br /> Olmsted, F.H. and Davis, G.H., 1961, Geologic features and ground-water storage capacity of the <br /> Sacramento Valley, California: U.S. Geological Survey Water-Supply Paper, 1497, 241 p. <br /> • <br /> Advanced GeoEnvironmental,Inc. <br />