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Fr <br /> Service Station #5469 <br /> QGM & RPR 2Q06 <br /> September 18, 2006 <br /> Page 5 <br /> Since the OS system began operation in December 2002, these two wells have exhibited <br /> generally higher DO concentrations relative to the other monitoring wells (Figure 5), indicating <br /> that OS is effecting the DO concentration in these wells <br /> The DO, total iron, COD, GRO, and plate count concentrations versus time for wells MW-4, <br /> MW-6, and MW-8 are presented in Figures 6 through 8, respectively An overall distinctive <br /> correlation between DO, COD, total iron, GRO and plate count concentrations is not obviously <br /> apparent in wells MW-4, MW-6, and MW-8 <br /> The GRO, benzene, and/or MtBE concentrations versus time in the impacted wells (MW-4, MW- <br /> 5, MW-6, MW-8, and MW-10) are graphically depicted on Figures 9 through 13, respectively <br /> GRO, benzene, and ME concentrations appear to have decreased since the OS system <br /> began operation in December 2002 <br /> 116P-ARC0104 BP Valley Portfolio154691Reports\QMRs12006\W9 202006 doc St;COR Intematlona!Incorporatod <br />