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0 <br /> CLEANUP AND ABATEMENT ORDER NO.R5-2006-0720 <br /> NESTLE USA,INC. <br /> RIPON,SAN JOAQUIN COUNTY <br /> recommendations to address them. Within 30 days of receipt of Regional Board staff comments on <br /> the Draft Report, submit the Final Updated Site Conceptual Model Report. <br /> 6. By 15 September 2006, submit a Draft Lower Aquifer Zone Investigation Work Plan for Regional <br /> Board staff review. The Draft Work Plan shall provide a detailed sampling program to investigate <br /> the recent increasing TCE and cis-1,2-DCE concentrations in Lower Aquifer monitoring wells and <br /> delineate the full extent of the TCE plume in the Lower Aquifer. The sampling program shall <br /> include collection of groundwater samples from all depths of the Lower Aquifer Zone impacted by <br /> the Discharger's plume and installation of new wells to monitor both horizontal and vertical <br /> movement of the plume. The new well installations shall include wells to monitor potential vertical <br /> migration near source area monitoring wells M-613 and M-813 to deeper portions of the Lower <br /> Aquifer Zone. Within 15 days of receipt of Regional Board staff comments on the Draft Work Plan, <br /> submit the Final Lower Aquifer Zone Investigation Work Plan. <br /> 7. Within 150 days of receiving concurrence from Regional Board staff on the Final Lower Aquifer <br /> Zone Investigation Work Plan, complete all actions specified in the Final Work plan and submit the <br /> Draft Lower Aquifer Zone Investigation Report. Within 30 days of receipt of Regional Board staff <br /> comments on the Draft Lower Aquifer Zone Investigation Report, submit the Final Lower Aquifer <br /> Zone Investigation Report. <br /> 8. By 13 November 2006,the Discharger shall complete assessment of potential vapor intrusion into <br /> buildings overlying the TCE plume and submit a Final Report, addressing all Regional Board staff <br /> comments on the Indoor Air Vapor Intrusion Risk Evaluation Report and the Soil Gas Survey Work <br /> Plan. <br /> 9. By 30 November 2006, complete installation of a monitoring well cluster west of monitoring well <br /> cluster M-32 and at or down gradient of the edge of the TCE plume. <br /> 10.By 30 November 2006, complete installation of guard wells between the Discharger's source areas <br /> and City of Ripon supply wells MW-13 and MW-14. <br /> Feasibility Study and Cleanup <br /> 11. By 30 July 2006, begin pumping existing extraction wells at design rates or the maximum disposal <br /> rate permitted to the City of Ripon's industrial sewer. <br /> 12. By 15 October 2006, submit the Draft Revised Groundwater Model Report detailing the final model <br /> calibration and simulations of pumping scenarios that will provide full containment and cleanup of <br /> the TCE plume originating from the former Nestid facility. The simulated pumping scenarios, at a <br /> minimum, shall include full capture of the TCE plume(including degradation products)that exceeds <br /> MCLS (scenario 1) and full capture of the plume that exceeds a concentration of 0.5 gg/L(scenario <br /> 2). Within 60 days of receiving Regional Board staff comments on the Draft Model Report, submit <br /> the Final Revised Groundwater Model Report. <br /> 12 <br />