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CV2 \V 9 <br /> 0 <br /> A S S O C I A T E S I N C <br /> RESULTS <br /> Water levels have increased an average of 165 feet since the last monitoring event on December 1, <br /> 1999 (Table 1) A groundwater gradient map was created using the data collected on March 30, 2000 <br /> (Figure 2) Groundwater primarily flows northeast, away from the slough, with a gradient of <br /> approximately 0 06 feettfoot or 302 feet per mile <br /> TPHg and BTEX were not detected in any of the groundwater samples collected from wells MW 1 <br /> through MW6, although the detection limits for the sample from well MW5 were elevated due to <br /> dilution factors The samples from wells MW2, MW5 and MW6 contained TPHd at concentrations of <br /> 55 6, 114 and 103 parts per billion (ppb), respectively TPHd was reported as an unidentified <br /> hydrocarbon The samples from wells MW2, MW5 and MW6 contained MTBE at concentrations of <br /> 274 ppb, 17,500 ppb and 110 ppb, respectively Analytical results are summarized in Table 2 <br /> Laboratory reports with chain-of-custody documents are included in Attachment 2 <br /> ADDITIONAL SITE ACTTVTTIES <br /> On March 23, 2000, ATC personnel transported eight drums of soil cuttings to Forward Inc <br /> Landfill in Stockton, California for disposal On April 7, 2000, ATC personnel met with <br /> Clearwater Environmental who picked up approximately 485 gallons of purgewater from the site <br /> The purgewater was transported to Alviso Independent Oil in Alviso, California where the water <br /> was recycled Copies of field notes and the non-hazardous waste manifests are included in <br /> Attachment 3 <br /> RECONEHENDATIONS <br /> Due to the detectable concentrations of MTBE in the groundwater samples from wells MW2, MW5 <br /> and MW6, ATC recommends continued monitoring and sampling of all site wells (MWI through <br /> MW6)for TPH& TPHd,BTEX, and MTBE by EPA Methods 8015/8020 <br /> W <br /> 162514*art1yl1gr-2000 doc 2 <br />