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S E C O R <br /> 7-Eleven Store#94117 <br /> Field Test for Evaluation of Oxidation Capacity of Groundwater <br /> July 22, 2004 <br /> Page 7 <br /> DATA EVALUATION AND INTERPRETATION <br /> Following one month of oxygen injection (2 events) during which two sets of post-injection <br /> groundwater samples will have been collected and analyzed for general inorganic <br /> constituents, SECOR will compile and evaluate the analytical data to assess potential <br /> impacts to groundwater quality due to oxygen injection If products of injected oxygen <br /> reacting with groundwater are detrimental to groundwater quality, as evidenced by <br /> comparison with baseline groundwater chemistry, then oxygen injection will cease and <br /> other remedial methods will be considered However, if little or no change to groundwater <br /> quality is evident, oxygen injection will continue <br /> REPORTING <br /> SECOR will prepare a report evaluating the effect of oxygen injection on the water quality in <br /> the injection well and MW-1 The report will specify inorganic constituents that will continue <br /> to be included during future sampling events, e g , Cr*' or other constituents of concern, or <br /> constituents that show a marked change in concentration relative to baseline chemistry but <br /> are not considered health risks In addition, the report will present applicable chemical <br /> equations showing products of oxygen injection reacting with groundwater constituents <br /> and/or aquifer lithologies, estimates of potential dissolved solids mobilized, and discussion <br /> of noted changes in groundwater pH <br /> Groundwater sample analytical results, field parameter measurements (pH, dissolved <br /> oxygen, ferrous iron), total oxygen injected, presented in tabular form, will be included, as <br /> well as field notes and tabulated amounts purged during each event <br /> SECOR will begin scheduling well installation activities as soon as this work plan is <br /> approved by the RWQCB <br /> If you have questions or comments regarding this work plan, please contact us at(916) <br /> 861-0400 <br /> Sincerely, <br /> SECOR International Incorporated <br /> Zp GS <br /> [)AIEL J. —� <br /> Darnel J Davis, R G 0 I S <br /> Senior Geologist >� r <br /> No. 6435 <br /> Jaff Auchterlonie F OFC AL�FO�� <br /> Senior Geologist <br /> 14117 Field Test Oxidation capacity doc SECOR lntematronal Incorporated <br />