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_::::1?f}:•:.;r:rr::: r 'r... ...:r ------------. <br /> Report: Groundwater-quality Monitoring—June 23-28,2005, 7500 West Eleventh Street, Tracy, CA. Page 15 <br /> i-1 <br /> ? } <br /> analyte of concern. These findings also show that the plume is stable and that further <br /> down-gradient migration of fuel hydrocarbons is not occurring at the Navarra Site. E <br /> I <br /> 2.5.3 An es of Concern in Secondar Groundwater Plume <br /> As can be seen by inspection of Table 2, the concentrations of analytes of concern in <br /> undwater quality in the area of origination <br /> Monitoring Well MW-12, which monitors gropriod <br /> of the secondary plume of affected groundwater on the Navarra Site, rose over <br /> the ee the <br /> March 9, 2005 when they were last measured, to June 27, 2005. p <br /> concentration of gasoline rose from 140 µg/L to 820 µg/L. The results are consistent with <br /> j the annual fluctuations in concentrations that are related to changes in the elevation of the <br /> the very large volumes of agricultural irrigation water <br /> groundwater table associated with <br /> that are discharged into near-surface aquifers during the annual dry season in the Tracy <br /> area and which commonly cause the groundwater table to rise to peak elevation in the <br /> 4_ summer of each year. <br /> 1 <br /> I r' <br /> sic <br /> 4;_J <: <br />