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1 - <br /> ElhV <br /> �_ "&= <br /> Mr James L Barton <br />' October 29, 2004 <br /> Page 9 <br />' Recommendations <br /> During the third quarter of 2004, ENSR observed a reduction in dissolved benzene <br /> concentrations beneath the site ENSR recommends that the ASISVE system be operated on a <br />' continuous basis until soil and groundwater data demonstrate that operation of the ASISVE <br /> system is no longer a feasible remediation option for this site <br /> ENSR recommends that the groundwater monitoring and sampling program for this site be <br /> continued <br />' Future Work <br /> ENSR will continue to optimize the ASISVE system in order to limit system downtime <br /> Additionally, ENSR will submit the following reports as directed in the RWQCB letter dated <br /> iOctober 4, 2004 <br /> 1 Geochemical Evaluation and a final version of the Work Plan and Schedule Begin <br /> installation of additional monitoring wells into the lower two water zones (Unit C and Unit D) <br /> to further define the vertical and lateral extent of contaminants in those units and the <br /> groundwater flow direction relative to the upper units Due date November 15, 2004 <br /> 2 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 Pending approvals from the site <br /> owner, RWQCB and the permitting agency, well installation activities should begin prior to <br /> November 15, 2004 <br /> 3 Conduct a comparative analysis of the changes in contaminant concentrations and <br /> distribution and mass within the aquifer beneath the site and Remedial System Evaluation <br /> Due date November 30, 2004 <br /> 4 Conduct bench-scale and pilot scale tests of in situ chemical oxidation with ozone The <br /> studies will evaluate the potential for ozone to be used to effect in situ contaminant mass <br /> destruction without adverse impacts to the aquifer ENSR anticipates that this activity will be <br /> completed prior to December 30, 2004 <br /> 5 Beginning with the 0 quarter 2004 groundwater sampling event, groundwater parameters <br /> �_ �__-_J�a.... rnnr•=ntra4lnn-_ of nitrates and sulfates by <br /> relatea To intrinsic Uioudeg audatio spec,1161anx, vv. •+•+ • �•• <br /> EPA Method 300, iron (II) and manganese (II) by EPA Method 200 7, and methane EPA <br /> Method RK will be analyzed in wells MW-2, MW-4, MW-7, MW-8D, MW-11, MW-14, MW-16 <br /> and MW-27 These analyses will also be utilized in evaluating the appropriate response to <br /> fluctuating concentrations at the plume boundaries Due date January 15, 2005 <br /> UDcsacramentolorojects\Protectsl0694015098-293WinaAReports%ouarteriy Mondonng ReportsZ098 3rd Qtr 04-QMR doc <br /> CetPb"atlnG 1{ Vpa-of EaCPtl@rre rP t+1v"opF+' nt,3 ,Ser✓1ce <br />