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CVV qT C <br /> A S S O C I A T E S I N C . <br /> Also during the fourth quarter monitoring event, TPHg levels in on-site wells, MW1, MW2, <br /> MW4 and EWI also declined. TPHg in MW8 remains undetected. TPHg levels in on-site wells, <br /> MW3 and MWS increased. <br /> Concentrations of benzene and TPHg appear to be declining due the C-SpargeTM operation in <br /> MW1, MW2, MW4, MW8 and EWI. Trends of MTBE need to be evaluated more. <br /> MW10b is the only offsite well where MTBE concentrations increased this quarter (from 35 ug/L <br /> on September 13, 2004 to 44 ug/L on December 13, 2004). MW6b, MW6c and MW7c showed <br /> fairly significant declines in MTBE. <br /> 6.0 RECOMMENDATIONS <br /> Based on the results of the Fourth Quarter 2004 monitoring episode, ATC makes the following <br /> recommendations: <br /> ■ Conduct first quarter groundwater monitoring and sampling of MW1 through MW10C <br /> and EW1 and analyze the samples for TPHg, BTEX, MTBE, ETBE, DIPS, TBA, TAME, <br /> 1, 2-DCA and EDB. <br /> ■ Conduct monthly groundwater monitoring and sampling for field parameters including <br /> i DO and ORP in the on-site remediation well network (MW1 through MW5, MW8 and <br /> EWI) <br /> ■ Continue operation and monitoring of the C-SpargeTM system for existing parameters and <br /> monitoring electrical meter readings. <br /> ■ Evaluate a supervisory control and data acquisition (SCADA) system and/or a process <br /> control system and install as necessary to reduce system non-operation time. <br /> REFERENCES <br /> CRC, 1972. Handbook of Chemistry and Physics, 52nd Edition, The Chemical Rubber Co., <br /> Cleveland, Ohio, p. B-116. <br /> EPA, 1998. Field Applications of In Situ Remediation Technologies: Chemical Oxidation. 03— <br /> Former service station, Commerce City, CO, Moiety Associates, htt ://www.e a. ov/swertiol; <br /> http://clu-in-org. <br /> Karpel vel Leitner, R.N.K., A.L. Papailhou, J.P. Crove, J. Payrot, and M. Dore. 1994. <br /> "Oxidation at Methyl Tert-Butyl Ether (MTBE).by.03 and.Combined 03/Hydrogen Peroxide." <br /> Ozone Science& Engineering. 16:41-54. <br /> Kerfoot, W.B. 2000. Ozone Microsparging for Rapid MTBE Removal. In: Chemical Oxidation <br /> and Reactive Barriers: Remediation of Chlorinated and Recalcitrant Compounds, Volume C2-6, , <br /> eds. G.B. Wickramanayake, A.R. Gavaskar and A.S.C. Chen. Battelle Press, Columbus, pp. 187- <br /> 194. <br /> SA268231QM reports12004 4QR.doc 13 <br />