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Report: Groundwater-quality Monitoring-,December 20-21,2005, 7500 West Eleventh Street, Tracy, CA. Page 14 <br /> round. This data indicates that conditions along the eastern perimeter of the principal <br /> plume of affected groundwater at the Navarra Site remain stable. <br /> At the down-gradient limit of the primary plume of affected groundwater, only a trace <br /> concentration of MTBE, at a concentration of 5.6 µg/L was detected in the groundwater <br /> sample recovered on December 20, 2005 from Monitoring Well MW-11. No detectable <br /> concentrations of any analytes of concern were detected in the groundwater sample <br /> recovered from Monitoring Well MW-19. These findings demonstrate that there has been <br /> no extension of the down-gradient migration of affected groundwater in the plume. <br /> 2.5.3 Anal es of Concern in Secondary Groundwater Plume <br /> As can be seen by inspection of Table 2, the results of the analyses of the sample of <br /> groundwater recovered on December 20, 2005 from Monitoring Well MW-12, which is <br /> located in the source area of the secondary plume of affected groundwater on the Navarra <br /> Site, indicate that the concentrations of analytes of concern in the groundwater in that <br /> area continue to oscillate around a declining trend line. <br /> t sic <br />