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5.2 Groundwater Contamination <br /> Laboratory analyses of groundwater samples collected from Site monitoring wells suggests that <br /> groundwater beneath the Site has been impacted by gasoline hydrocarbons Benzene was <br /> detected in groundwater samples collected from MW 1, MW2, and MW3 at 1200 parts per <br /> billion (ppb), 110 ppb, and 9 0 ppb, respectively The full extent of groundwater contamination <br /> has not yet been determined Laboratory analysis of groundwater samples collected from the <br /> apparent upgradient well (MW2) contained dissolved hydrocarbons of the same magnitude as the <br /> two downgradfent wells (MW 1 and MW3) suggesting another contaminant source exists and/or <br /> the groundwater gradient has shifted in the past <br /> 6.0 REFERENCES <br /> State of California, Department of Water Resources 1981, Water Well Standards State <br /> of Cahfornta. Bulletin 74-81, 92pp <br /> U S Geological Survey, 1986, Professional Paper 1401-C, Geology ot the Fresh <br /> i <br /> I <br /> Groundwater Basin of the Central Valla, California. with Texture Mas and Sections <br /> U S Geological Survey, 1989, Professional Paper 1401-D, Groundwater Flow to the <br /> Central Valley. California <br /> 1 <br /> 1 <br /> 1 <br /> R-61292 TL 7 <br />