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Report: Groundwater-quality Monitoring—October 20-21,2005, 7500 West Eleventh.Street, Tracy, CA. Page 18 <br /> 5.0 CONCLUSIONS <br /> Based on the data obtained from the groundwater-quality monitoring round conducted at <br /> the 7500 West Eleventh Street site in October 2005 and its integration with the data <br /> gathered cumulatively over the seven-year period since December 1998 when <br /> investigations were initiated at this site, SJC concludes the following. <br /> 1. The plumes of water affected by releases of fuel hydrocarbons that were released <br /> at the former fueling station at 7500 West Eleventh Street remain stable. <br /> 2. Although its amplitude above the local groundwater table reduced by more than <br /> three feet over the period June through October 2005, a groundwater mound <br /> centered near Monitoring Well MW-16 that was first observed in February 2005, <br /> continued to be present. <br /> 3. Concentrations of components of fuel hydrocarbons within the plumes of affected <br /> >3 groundwater are continuing to oscillate around a downward trend. <br /> 4. A 0.14 ft. thickness of floating product (LNAPL) was present on the groundwater <br /> in Monitoring Well MW-7 in October 2005. <br /> 5. No concentrations of any components of fuel hydrocarbons were detected in <br /> samples recovered from any of the three monitored potable water supply wells. <br /> sic <br />