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E11��t� <br /> ' VIA <br /> James t- Barton <br /> February 17, 2004 <br /> Page 4 <br /> ' 10 Analytical results for sod vapor samples collected during Fourth Quarter 2003 are <br /> summarized on Table 11. Copies of the laboratory analytical results with chain-of-custody <br /> documentation are included in Attachment D <br /> Waste <br /> Non-hazardous purge water generated during Fourth Quarter groundwater monitoring and <br /> sampling activities is temporarily stored on site pending transport to an approved Unocal <br /> disposal facility <br /> ' Discussion <br /> ' Analytical results from wells MW-11 and MW-12 indicate that the air sparge system appears to <br /> be effective as evidenced by the decreasing petroleum hydrocarbon concentrations Increases <br /> were observed in petroleum hydrocarbon concentrations in wells MW-2 and MW-3 <br /> Hydrocarbon concentrations in these wells have decreased since the beginning of remediation <br /> ' in October 1999 <br /> Recommendations <br /> ENSR recommends that pulsed operation of the AS system be continued, and that further <br /> groundwater sampling be performed to confirm system effectiveness <br /> ' Future Work <br /> ENSR will continue to troubleshoot the treatment system in order to limit system downtime The <br /> First Quarter groundwater monitoring and sampling is scheduled for February 2004 <br /> Remarks/Slanatures <br /> The interpretations in this report represent our professional opinions and are based, in part, on <br /> the information supplied by the client These opinions are based on currently available <br /> ' information and are arrived at in accordance with currently accepted hydrogeologic and <br /> engineering practices at this time and location Other than this, no warranty is implied or <br /> intended <br /> 1 <br /> 1 <br /> J IProiects1069401293-50981Finall4th Qtr'03-QMR RSR doc <br />' 35 Years of Excellence in Environmental Services <br />