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4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 41 CONCLUSIONS <br /> Based on the data collected to date, ESE has made the following conclusions: <br /> • Ground water flow beneath the site is generally to the southwest with a gentle <br /> gradient; <br /> • TPH-D, and BTEX were not detected in the ground water samples from any of the <br /> wells during the third quarter 1993, and <br /> • An extensive investigation at the site and ground water monitoring performed at the <br /> site over a three year period have not found impacted soil or detectable concentrations <br /> of petroleum hydrocarbon constituents in ground water at concentrations consistently <br /> above drinlang water standards. <br /> 4 2 RECOMMENDATIONS <br /> ESE has the following recommendations <br /> • The site should be closed with no further action required based on the lack of <br /> evidence of an onsite source in the unsaturated soil zone and lack of evidence of <br /> petroleum hydrocarbon constituents above drinking water standards. <br /> • Upon receiving site closure, the wells should be properly abandoned in accordance <br /> with State of California Well Standards. <br /> Environmental Science <br /> F\6925009\3gmr 993 S &Engineering,Inc <br />