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E11��t® <br /> Mr. Mike Infurna <br /> FApril 26, 2004 <br /> Page 4 <br /> F�, <br /> Copies of the laboratory analytical results with chain-of-custody documentation are included in <br /> Attachment D. <br /> Waste <br /> Non-hazardous purge water generated during first quarter 2004 groundwater monitoring and <br /> sampling activities is temporarily stored on-site pending transport to Evergreen Oil Company in <br /> FiNewark, Ca. <br /> Discussion <br /> Analytical results from wells MW-3, MW-11 and MW-12 indicate that the air sparge system <br /> appears to be effective as evidenced by the decreasing TPHg and benzene concentrations. A <br /> slight increase in TPHg was observed in well MW-2. Benzene concentrations in MW-2 <br /> decreased since the previous quarter. Hydrocarbon concentrations in these wells have <br /> decreased overall since the beginning of remediation in October 1999. <br /> Recommendations <br /> ENSR recommends that pulsed operation of the AS system continue, and that further <br /> groundwater sampling be performed to confirm the system's effectiveness. <br /> Future Work <br /> ENSR intends to perform a major service on the air compressor during the second quarter of <br /> 2004. ENSR hopes that by performing the necessary maintenance the system will be able to <br /> run more effectively in the future. ENSR will continue to troubleshoot the treatment system in <br /> 1 order to limit system downtime. The second quarter groundwater monitoring and sampling is <br /> scheduled for May 2004. <br /> Remarks/Signatures <br /> r 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 /> 1t <br /> r� <br /> J:1Projects10694015098-2931FinallReportsl4st Qtr'04-QMR RSR.doc <br /> C 35 Years of Excellence in Environmental Services <br /> 4 <br />