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404 WEST FREMONT STREET <br /> WKA No 1628 08 <br /> OL December 10, 1997 <br /> 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 NIW2, SMW2, MW3 and MW6 revealed no detectable concentrations <br /> of TPH or BTEX <br /> Concentrations of petroleum hydrocarbons were detected In the water samples from wells MW1, <br /> MW4 and MW5 Review of historic data reveals continued no specific trend with regard to TPH <br /> concentrations In these wells However, both TPH and BTEX have Increased dramatically In <br /> MWS, (a former perimeter well) No MtBE or other oxygenates were detected in any of the <br /> monitoring wells A summary of analytical results for ground water samples obtained from the six <br /> on-site and one off-site monitoring wells are Included as Table 2 Complete analytical reports and <br /> chain-of-custody 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 December 1997 and will include <br /> elevation data and groundwater samples from the new wells The vapor extraction pilot test Is <br /> tentatively scheduled for early December Our report for next quarter will be transmitted upon <br /> completion of laboratory testing <br /> Wallace ■ Kuhl & Associates, Inc \S� p D Gq§ <br /> q P <br /> i'o 'z('� .' <br /> V <br /> y <br /> Kulalaek hl <br /> S <br /> Kg <br /> Hydrogeologist OF CAL ' <br /> KB EH sdm <br /> Copy to Mr Steve Sasson, San Joaquin County PHS <br /> k\Crystai1162"8 qt3 <br /> Rerycled paper <br /> C R£Wat KY-S 1Xr_ <br />