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EXECUTIVE SUMMARY <br /> • Groundwater samples were collected from seven of the eight monitoring wells on January 27, 2005 <br /> One well was dry and could not be sampled Total Petroleum Hydrocarbons in the gasoline range <br /> and benzene and/or other aromatic compounds were detected in six of seven samples In most <br /> wells, TP"-g concentrations increased by 10%or more since the wells were last sampled in June <br /> 2004, while the concentrations of benzene and other volatile aromatic compounds remained <br /> unchanged The laboratory noted that the TPH-g chromatograms did not resemble the standard <br /> gasoline chromatogram Whether this indicates that non-gasoline hydrocarbons are present, or that <br /> gasoline has degraded and volatile compounds are underrepresented, is uncertain <br /> The elevation of the water table was approximately 22 feet below sea level, which is 1 foot deeper <br /> than when the site was monitored in the second quarter of 2004 The groundwater flow direction <br /> continues to be east <br /> A thermal oxidation soil vapor extraction unit was mobilized to the site on February 3, 2005 The <br /> underground vapor line has not yet been installed Testing of the system will take place in early <br /> March, and full operation is anticipated to begin after approval from the San Joaquin Valley Air <br /> Pollution Control District <br /> • <br /> 1 <br />