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Report.Groundwater-quality Monitoring—October 27,2004, 7500 West Eleventh Street, Tracy,CA. Page 18 <br /> t 6.0 CONCLUSIONS <br /> Based on the data obtained from the groundwater-quality monitoring round conducted at <br /> the 7500 West Eleventh Street site on October 27 and 28, 2004 and its integration with <br /> the data gathered cumulatively over the six-year period since December 1998 when <br /> investigations were initiated at this site, SJC concludes the following. <br /> r <br /> 1. The plumes of water affected by releases of fuel hydrocarbons that were released <br /> at the former fuelingstation at 7500 West Eleventh Street are stable and the <br /> northerly, down-gradient limit of the primary plume is receding southward. <br /> 2. No floating product (LNAPL) is currently present on the groundwater within the <br /> plumes. <br /> 3. Concentrations of components of fuel hydrocarbons within the plumes of affected <br /> groundwater are oscillating around a downward trend. <br /> 4. The extensive program of subsurface investigation and groundwater monitoring <br /> that has been completed at the subject site has produced the data necessary to <br /> define accurately the lateral and vertical extent of zones of the 'subsurface that <br /> were affected by the releases of fuel hydrocarbons. <br /> I i <br /> << 5. Work to bring the site to regulatory "closure" based on an analysis of the active a <br /> processes of natural attenuation of analytes of concern within the plumes of <br /> affected groundwater should be initiated. <br /> E� <br /> 1 <br /> sic <br />