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Elh Cit <br /> EZUEUREM <br /> Margaret Lagorio <br /> ' February 17, 2004 <br /> Page 4 <br /> ' MTBE Concentration Trends <br /> ' • MTBE was detected in groundwater monitoring well U-26 at 1.7 micrograms per liter (µg/L). <br /> Discussion <br /> Analytical results from piezometer NP-1-65 and NP-2-60 indicate that the ozone microsparge <br /> system appears to be effective as evidenced by the decreasing petroleum hydrocarbon <br /> ' concentrations. Increases were observed in petroleum hydrocarbon concentrations in <br /> piezometer NP-1-22, and wells U-3, and U-10. Hydrocarbon concentrations in these wells have <br /> decreased overall since the startup of the baseline test of the C-SpargeT" system. Hydrocarbon <br /> concentrations in piezometer NP-1-111, NP-2-22, and NP-2-116 have remained below <br /> laboratory reporting limits from the Third Quarter to the Fourth Quarter in 2003. <br /> Recommendations <br /> ' ENSR recommends that operation of the Ozone Pilot Test system be continued and further <br /> groundwater sampling and D.O. monitoring be performed to evaluate the system's <br /> effectiveness. <br /> Future Work <br /> ' ENSR will continue to monitor the treatment system and improve operational status to reduce <br /> system downtime. The first quarter groundwater monitoring and sampling is scheduled for <br /> ' February 2004. <br /> Remarks/Signatures <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 /> ' J:\Projects\069401325-0187\FinallRepoas\4th Qtr 2003-QMR RSR.cloc <br /> ' 35 Years of Excellence in Environmental Services <br />