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Nestle USA, Inc.—Ripon, CA January 28, 2011 <br /> 2011 Revised Feasibility Study <br /> is not uncommon for agricultural wells to be installed without permits or other <br /> record. Without knowing a vertical conduit's existence and location, eliminating <br /> all conduits is impossible to implement. However, decommissioning is highly <br /> implementable for known wells. <br /> 9.4.2.3 Relative Cost <br /> Cost is acceptable for this technology, due to the ultimate effectiveness. <br /> 9.4.3 Municipal and Other Pumping Coordination <br /> Municipal, agricultural, and industrial pumping has contributed to plume <br /> migration. The high rates of water withdrawal from these wells has induced <br /> artificial groundwater gradients and flow directions. These activities can <br /> counteract efforts to meet the remedial goal of plume reduction. Managing <br /> groundwater pumping in the vicinity of the COC plume can help mitigate the <br /> extent and movement of the plumes. Nestle and the City of Ripon agreed to limit <br /> pumping at MW-4 and MW-7 to specified levels and to operate MW-9 at a <br /> minimum rate of 600 gpm. Future agreements and understandings between <br /> Nestle and the City of Ripon regarding management of the municipal water <br /> supply is a critical component of institutional controls within the Study Area. <br /> Nestle has initiated a dialogue with the City of Ripon regarding municipal well <br /> pumping management. Nestle is currently developing a Water Management <br /> Plan in partnership with City of Ripon. <br /> 9.4.3.1 Effectiveness <br /> Coordination of municipal pumping with the City of Ripon to date has proven to <br /> effectively minimize the spread of the plume. When municipal pumping near the <br /> plume is decreased, Nestle's pump-and-treat systems are more effective in <br /> controlling plume migration. <br /> 9.4.3.2 Implementability <br /> Nestle and the City of Ripon have a good working relationship, making <br /> coordination implementable. <br /> 9.4.3.3 Relative Cost <br /> Cost for municipal well pumping coordination efforts is typically minor, while the <br /> effect is significant and highly beneficial. <br /> 9.4.4 Control, Monitoring, and Well Installation <br /> The use of local ordinances to restrict well installation within the Study Area <br /> through existing well permitting processes can limit migration and exposure to <br /> COCs. A water management plan is being pursued for the Study Area to gain <br /> the cooperation of stakeholders to protect potential receptors from COCs in <br /> groundwater. <br /> 39 <br />