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Report:Groundwater-quality Monitoring—March 29-31,2006, 7500 West Eleventh Street, Tracy, CA Page 13 <br /> 1y <br /> L groundwater monitoring reports (The San Joaquin Company 2006a,b,c,d), it is believed <br /> that the appearance of the minor concentration of that analyte in that area is related to the <br /> development of the groundwater mound that, as discussed in Section 2.1.1 above, is <br /> centered near Monitoring Well MW-16. <br /> In general, the concentrations of analytes of concern detected in the samples recovered <br /> from Monitoring Wells MW-4, MWFP-2, MWFP-5 and MW-10 in March 2006 were <br /> lower than those measured during the December 2005 sampling round- In fact, the <br /> sample recovered from Monitoring Well MWFP-5 on March 30, 2006 contained no <br /> detectable concentrations of any analytes of concern. <br /> LAt the down-gradient limit of the primary plume of affected groundwater, only a trace <br /> concentration of MTBE, at a concentration of 3.6 µglL was detected in the groundwater <br /> sample recovered on March 30, 2006 from Monitoring Well MW-11. Groundwater in <br /> LMonitoring Well MW-19 remained free of any analytes of concern. These findings <br /> demonstrate that there has been no extension of the down-gradient migration of affected <br /> 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, in the groundwater sample recovered from <br /> Monitoring Well MW-12 on March 31, 2006, TPHd and TPHg were no longer detected. <br /> The concentration of benzene in that well was 1.2 gg/L, a decrease from the 23 µg/L <br /> measured in the sample recovered from that well on December 20, 2005. <br /> sic <br />