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404 WEST FREMONT STREET <br /> WKA No. 1628.08 <br /> s January 13, 1998 <br /> ILW Page 2 <br /> the wells were sampled in order of increasing concentration based on previous sampling results. <br /> All water removed during sampling and purging operations was placed in sealed and labeled 55- <br /> gallon drums and stored on site. <br /> Analysis of water samples MW2, SMW2, MW3 and MW6 again revealed no detectable <br /> concentrations of TPH or BTEX.. <br /> Concentrations of petroleum hydrocarbons were detected in the water samples from wells NMI, <br /> MW4 and MW5. Review of historic data reveals no specific trend with regard to TPH <br /> concentrations in these wells. However, both TPH and BTEX have increased dramatically in <br /> MW5, (a former perimeter welI). No MtBE or other oxygenates were detected in any of the <br /> monitoring wells. The newly installed MW7 (located north of MW5 across West Fremont Street) <br /> was first sampled on December 30, 1997. Though analysis revealed no detectable concentrations <br /> of TPH in the new well, a small quantity of benzene (1.4 ug/L) was reported. A summary of <br /> analytical results for ground water samples obtained from the six on-site and one off-site <br /> monitoring wells are included as Table 2. Complete analytical reports and chain-of-custody <br /> documentation are included in the appendix. <br /> Additional field work completed during this time frame included the construction of monitoring <br /> well MW7 northerly of MW5 across West Fremont Street and three soil vapor extraction/air <br /> sparging wells constructed in preparation for a vapor,extraction pilot study. All of the above <br /> wells were completed on November 20, 1997. Analytical results have not been received. <br /> The next quarter of ground water sampling is scheduled for February 1998 and will include <br /> elevation data and groundwater samples from the new wells. The vapor extraction pilot test is <br /> tentatively.scheduled for early February. Our report for next quarter will be transmitted upon <br /> completion of laboratory testing. <br /> Wallace ■ Kuhl & Associates, Inc. <br /> Ku alasek <br /> S 'or Hydrogeologist <br /> KB:EH:sdm <br /> Copy to: Mr. Steve Sasson, San Joaquin County PHS <br /> K\Crysta11162"8.yt4 <br /> WALLACE-KUHL <br /> 1"wl-p- &ASSOCIATES INC. <br />