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PLATE F, (xylene) shows that MWA recorded 0.4 ug/L, MW-2 was 0.4 ug/L, and <br /> MW-3 measured 0.7 ug/L <br /> PLATE G, (TPHg) shows that MW-2 continues to measure the highest levels <br /> The concentration increased from 496 ug/L in March, 1998, to 1150 ug/L from <br /> this latest sampling However, levels in MW-1 & MW-3 have decreased <br /> Summaries of all of the laboratory analyses of water samples taken since <br /> monitoring began are shown on the following TABLE 1 (MW-1,) TABLE 2 (MW- <br /> 2,) and TABLE 3 (MW-3 ) This was the second time that oxygenates were <br /> analyzed - they were all ND from the first sampling This time, MW-1 & MW-3 <br /> were below detection levels, but MW-2 measured MTBE at 12 ug/L, and TBA at <br /> 24 ug/L <br /> A review of the three tables does not indicate any apparent trend MW-2 has <br /> consistently recorded the highest levels of BTEX, with MWA the lowest All <br /> three wells have measured TPHg in varying amounts <br /> We have been informed that a soil/vapor air sparging remediation system has <br /> been installed on the Darpetro site to the northwest However, we do not have <br /> any details of its' design or effectiveness Based upon the information to date, <br /> there is no detectable change in levels beneath the Morita site However, it may <br /> not have been in operation long enough to show any effect <br /> As instructed by the San Joaquin County EHD, we are preparing a workplan for <br /> placing two (2) additional monitoring wells in an attempt to further define the <br /> limits of the p me to the east and west It will be submitted shortly <br /> *Morita s dates <br /> cc F ank <br /> RWCB <br /> S��gET] Gpt U <br /> IY;LL;i.A J ,i,,%lER <br /> lrywl; d 11111179i <br /> NO 860 <br /> spq�OF CpL1� P <br /> 2 <br />