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Nestle USA, Inc.—Ripon, CA January 28, 2011 <br /> 2011 Revised Feasibility Study <br /> followed by up to $580,000 in recurring costs associated with collecting and <br /> evaluating future data. <br /> 9.3.3.4 Conclusion <br /> IR, or intrinsic remediation, is a proven long-term approach for continued mass- <br /> reduction. This technology should be considered for COC mass reduction after <br /> high concentrations of COCs have been removed from the site, and is applicable <br /> to the entire Study Area as described in Appendix B. <br /> 9.4 Institutional Controls <br /> Institutional controls limit human activities that would result in exposure to COCs <br /> or plume migration to human or environmental receptors. Institutional controls <br /> include the following: <br /> 1. Water Supply Replacement, <br /> 2. Well Destruction (wells acting as conduits or already impacted), <br /> 3. Municipal and Other Pumping Coordination, and <br /> 4. Control, monitoring, and well installation coordination <br /> 9.4.1 Water Supply Replacement <br /> Water supply replacement involves disconnecting of impacted water supply wells <br /> and providing alternative water supplies to affected users. Nestle's May 2007 <br /> Water Replacement Contingency Plan'"' outlines the procedures for identifying <br /> possible risks to domestic, agricultural, and industrial water supplies. It also <br /> specifies options for initial and long-term replacements for those water supplies, <br /> such as the following: <br /> • Initial replacement of domestic water supplies with bottled drinking water, <br /> • Wellhead treatment systems, <br /> • Connection to existing public water or irrigation water supply systems, <br /> and/or <br /> • Installation of replacement water supply wells. <br /> The Water Replacement Contingency Plan provides additional guidance <br /> regarding when, where, and how to use these replacement options. Nestle has <br /> replaced water in impacted wells south of the River pursuant to this plan. <br /> 9.4.1.1 Effectiveness <br /> Water supply replacement is an effective method of providing safe drinking water <br /> to individuals whose wells have been or are in danger of being impacted. This <br /> technology can be important for plume reduction also. Water supply wells can <br /> influence and increase the movement of COCs in the subsurface if their zone of <br /> hydraulic influence extends to areas of COC impacts. Therefore, by replacing <br /> any such wells, the plume is no longer adversely affected or mobilized. <br /> 37 <br />