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northeasterly direction with a gradient of approximately 0 004 ft/ft or 23 ft/mile, as depicted on <br /> Figure 5 <br /> ' <br /> 5.4 CONCLUSIONS <br /> 5.1 Soil Contamination <br /> ' Field PID readings and laboratory analyses of soil samples collected from borings MW1, MW2 <br /> and MW3 indicate low to moderate levels of hydrocarbon constituents exist in the soil within <br /> ' 5-7 feet of the static water level at the site, suggesting that the majority of soil contamination <br /> at the site may be due to fluctuation of contaminated groundwater <br /> ' <br /> 5.2 Groundwater <br /> Contamination <br /> Analytical results of groundwater samples collected from MW1, MW2, and MW3 indicate <br /> groundwater has been impacted beneath the site The lateral extent of the dissolved hydrocarbon <br /> ' plume cannot be determined based upon the data collected to date <br /> To fully define groundwater conditions beneath the site, the extent of the dissolved hydrocarbon <br /> plume associated with the former fuel storage tank should be investigated further In addition, <br /> potential contamination sources upgradient of the site should be investigated <br /> ' 6.0 REFERENCES <br /> • Department of Water Resources, Bulletin No 146, San Joaquin County Ground Water <br /> ' Investigation, July 1967 <br /> • U S Geological Survey, Professional Paper 1401-C, Geology of the Fresh Ground-water <br /> Basin of the Central Valley_,_California, with Texture Maps and Sections, 1986 <br /> • U S Geological Survey, West Stockton Quadrangle, California, 1987 <br /> • U S Geological Survey, Professional Paper 1401-D, Groundwater Flow in the Centra <br /> California, 1989 <br /> ' • San Joaquin County, Flood Control and Water Conservation District, Semi-Annual <br /> Groundwater Re art, Spring 1991 <br /> ' IPAR049z TJL 8 <br />