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r� <br /> 5.0 CONCLUSIONS <br /> 5.1 Soil Contamination <br /> Soil samples collected at the time of tank removal (March 1992) indicated that <br /> hydrocarbons were present in the soil. However, no contamination was detected in the two <br /> soil samples analyzed in the present investigation. This indicates that the soil contamination <br /> originally detected is either: 1) not laterally or vertically extensive or; 2) has naturally <br /> remediated. Further excavation would probably not result in the removal of a significant <br /> volume of contamination. <br /> 5.2 Groundwater Contamination <br /> Following the removal of the two UST's from the site in 1990, toluene, ethylbenzene, <br /> xylenes and gasoline were detected in the two soil samples that were collected from the <br /> floor of the tank excavation. The samples were collected at a depth of 10 feet. The results <br /> indicated that an unauthorized release of gasoline had occurred. Laboratory analysis of the <br /> water sample collected at a depth of 8 feet from MW-1, indicates that groundwater has been <br /> impacted by the release. The release has not impacted the domestic well, which was recently <br /> sampled by the CVRWQCB (letter dated October 6, 1993). <br /> 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily <br /> exercised by environmental consultants practicing in this or similar localities. The findings <br /> were based upon analytical results provided by an independent laboratory. Evaluations of <br /> the geologic/hydrogeologic conditions at the site for the purpose of this investigation are <br /> made from a limited number of available data points (i.e. monitoring wells, soil samples) <br /> and subsurface conditions may vary away from these data points. No other warranty, <br /> expressed or implied, is made as to the professional recommendations contained in this <br /> f report. <br /> L <br /> 7.0 REFERENCES <br /> San Joaquin County, Department of Public Works, Flood Control Section, 1990, "Lines of <br /> Equal Elevation of Water in Wells". <br /> L Geological A.&Seriaee.lac <br /> Rand Properry/12d69]BL&S <br />