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. required by AB2886 The electronic delivery receipt is attached in Appendix C Historical groundwater <br /> monitoring and chemical analytical data back to 2000 are included in Appendix D <br /> During the second quarter 2005, the average DO levels in observation wells (MW-3 through MW-10) <br /> varied in the range of 0 7 mg/L to 7 43 mg/L, while the average DO levels in background monitoring wells <br /> (MW-1 and MW-2)were in the range of 10 mg1L to 2 0 mg/L During the second quarter 2005, higher DO <br /> levels in the range of 7 90 mg/L to 11 40 mg/L were observed in wells MW-7 and MW-9 (located <br /> approximately 10 feet from the injection point) The DO levels in the observation wells continue to be <br /> generally greater than the background monitoring wells, and is likely due to ozone injection DO levels in <br /> the observation wells are consistent with levels measured during previous monitoring events <br /> Concentrations of COD generally appear to correspond to changes in GRO concentrations for wells <br /> MW-4, MW-6, and MW-8 (Figures 11 through 13) Inorganic constituents such as total iron, nitrates, and <br /> sulfates appear to be influencing the heterotrophic plates counts in the subsurface groundwater (Figures <br /> 14 through 16) <br /> Based on the field and laboratory data collected to date, the ozone injection system appears to be <br /> supplying ozone and oxygen to the subsurface as designed <br /> LIMITATIONS <br /> This report was prepared in general accordance with accepted standards of care that existed at the time <br /> this work was performed No other warranty, expressed or implied is made Conclusions and <br /> recommendations are based on field observations and data obtained from this work and previous <br /> investigations It should be recognized that definition and evaluation of geologic conditions is a difficult <br /> and inexact art Judgments leading to conclusions and recommendations are generally made with an <br /> incomplete knowledge of the subsurface conditions present More extensive studies may be performed to <br /> 0 reduce uncertainties This report is solely for the use and information of our client unless otherwise noted <br /> K IBP-Arco for UR5154691Quarterly12005Wco_5469_2Q05 docPage 5 of 6 3TRA-rVO <br />