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PLATE F, (xylene) shows that MW-3 measured 0.5 uglL, the other two wells <br /> were ND <br /> PLATE G, (TPHg) shows that MW-2 continues to measure the highest levels, <br /> although the concentration has dropped from 4810 ug/L in June, 1997, to 496 <br /> uglL from this latest sampling However, levels in MW-1 & MW-3 have gone up <br /> slightly <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 first time that oxygenates were <br /> analyzed, all were below detection levels We will test for them when the next <br /> sampling event occurs, if they are ND at that time, we will discontinue that <br /> analysis <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 MW-1 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 During a file review at the <br /> San Joaquin Co EHD offices, the design and installation details of that system <br /> were not available At that time, the EHD staff indicated that they believed the <br /> Darpetro & Morita plumes to be comingled, which supports our analysis of the <br /> two sites <br /> We will attempt to coordinate our sampling with the Darpetro activity, and will <br /> return o qua erly monitoring until further notice <br /> W rater&Associates <br /> c rank Morita <br /> RWCB <br /> RF-4 GEOI <br /> %LI16o 1 HUNTER � <br /> Ayi,es/r/Sp <br /> NO 860 <br /> 0 OF CAS-1E�<�� <br /> 2 <br />