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1 <br /> EAL-M. <br /> Mr James Barton <br /> November 2, 2004 <br /> Page 2 <br /> 1 treatment technologies to help control plume movement and achieve the ultimate goal of <br /> site closure The anticipated completion date for the RSE is November 30, 2004 <br /> 2 Conduct a comparative analysis of the changes In contaminant concentrations and <br /> distribution and mass within the aquifer beneath the site Temporal changes will be <br /> evaluated beginning with the start of active remediation In October 1999 Estimates of <br /> changes In contaminant mass and distribution will be evaluated In light of the original goals <br /> of the remedial system Recent groundwater monitoring results indicate reductions In <br /> contaminant mass now that the air sparging system has been overhauled and restarted <br />' and the highest residual concentrations are In a localized area around MW-11 The <br /> anticipated completion date for the comparative analysis Is November 30, 2004 <br /> 3 Install additional monitoring wells Into the lower two water zones (Unit C and Unit D) to <br /> further define the vertical and lateral extent of contaminants in those units and the <br /> groundwater flow direction relative to the upper units The work plan for the proposed wells <br /> (MW-31 and MW-32) is Included in this document Pending approvals from the site owner, <br /> RWQCB and San Joaquin County Environmental Health Department (SJCEHD), well <br /> Installation activities should begin prior to November 19, 2004 <br /> 4 Beginning in fourth quarter 2004, groundwater parameters related to Intrinsic <br /> biodegradation, specifically, concentrations of nitrates and sulfates by EPA Method 300, <br /> Iron (11) by Standard Method 3500 Fe D, manganese (11) by EPA Method 200 7, and <br /> methane EPA Method RK will be analyzed in wells MW-2, MW-4, MW-7, MW-8D, MW-11, <br /> MW-14, MW-16 and MW-27 Dissolved oxygen readings will also be collected from wells <br /> MW-2, MW4, MW-7, MW-8D, MW-11, MW-14, MW-16, and MW-27 Selected wells were <br /> chosen due to there proximity to the axes approximating the plume centerline and along a <br /> transverse axes The results will be plotted on radial redox diagrams as a visual aid in <br /> analyzing natural attenuation within the boundaries of and at the outer edges of the plume <br /> These analyses will also be utilized In evaluating the appropriate response to fluctuating <br /> concentrations at the plume boundaries <br /> 5 Depending on the results of the forthcoming Geochemlcal Evaluation (GE), conduct bench- <br /> scale and pilot-scale tests of in situ chemical oxidation using ozone The studies will <br /> evaluate the potential for ozone to be used to effect in situ contaminant mass destruction <br /> without adverse Impacts to the aquifer Alternative oxidants may also be evaluated during <br /> the bench-scale study The GE evaluation will be submitted to the RWCQB on or before <br /> November 15, 2004 During a conversation between Ben Heningburg and Jim Barton on <br /> October 15, 2004, Mr Barton stated that, based on preliminary soil analytical results for <br /> chromium, a bench-scale study would be required <br /> 6 Submit a Corrective Action Plan (CAP) or work plan that includes a feasibility study of <br /> alternative remedial technologies that may accelerate contaminant reductions and eventual <br /> . site closure Technologies will be evaluated for their ability to achieve remedial goals within <br /> an accelerated time frame at a minimal or reasonable cost Also, the need for active control <br /> \IDcsacramentolprojects\Protects10694015098-293TinaltiReportslWork Plan0098 work Plan-SVE AS System doc <br />