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ElhLyt® EZZEME= Ms Margaret Lagono February 5, 2004 Page 3 ' Effectiveness of Ozone Micros ar e System Groundwater samples were submitted for analyses of BTEX by EPA Method 8021, TPH as ' gasoline by EPA Method 8015 Modified, and fuel oxygenate compounds MTBE, TAME, TBA, DIPE, and ETBE using EPA Method 8260B Additionally, groundwater samples were analyzed for lead scavengers, EDB, and 1,2-DCA, using EPA Method 8260B Concentrations of MTBE were not reported at or above laboratory reporting limits in any of the groundwater samples submitted for analysis during the fourth quarter 2003 Copies of the groundwater sampling Information sheets are included In Attachment B Laboratory analytical results with chain-of- custody documentation are in included in Attachment C Concentrations of TPH as gasoline and benzene vs In wells MW-2, MW-10, MW-11, and NP-1 are depicted graphically In Attachment D ETPH as gasoline Concentrations • Concentrations of TPH as gasoline in wells MW-2 and MW-11 decreased since August 2003 • Concentrations of TPH as gasoline In well MW-10 increased since August 2003 • Concentration of TPH as gasoline in well NP-1 was not reported at or above laboratory reporting limits since October 2002 Benzene Concentrations • Concentrations of benzene in wells MW-11 and MW-15 decreased since August 2003 • Concentrations of benzene In wells MW-2, MW-10 increased since August 2003 ' Concentration of benzene in well NP-1 was not reported at or above laboratory reporting limits since November 2000 1 2 DCA Concentrations ' • Concentrations of 1,2-DCA, ranging between 3 6 u IL MW-5 and 170 u IL MW-17 were reported In wells MW-4, MW-5, MW-7, MWA0, MW-11 and MW-18 during the fourth quarter 2003 • Concentrations of 1,2-DCA in well MW-18 was not reported at or above laboratory reporting limit during the fourth quarter 2003 ' Discussion Analytical results from well MW-11 indicate that the ozone mrcrosparge system appears to be effective as evidenced by the decreasing petroleum hydrocarbon concentrations Increases were observed in petroleum hydrocarbon concentrations in wells MW-2, MWA0, and MW-11 These Increases in hydrocarbon concentrations are most likely due to desorption of hydrocarbons from soil caused by the mrcrosparge bubbles Hydrocarbon concentrations In well NP-1 have remained below laboratory reporting limits during the test period with the J 1Projects1069401357-28591FinallReportsl4th Qtr 2003-QMR-RSR doc ' 35 Years of Excellence In Environmental Services