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Nestle USA, Inc.—Ripon, CA January 28, 2011 <br /> 2011 Revised Feasibility Study <br /> 7.1.1 COCs in Soil <br /> ARARs for COCs in soil include the following: <br /> • USEPA PRGs, <br /> • Risk-Based Target Concentrations (RBTCs), <br /> • USEPA Toxicity Characteristic Thresholds, and <br /> • Department of Toxic Substances Control Soluble and Total Threshold <br /> Limit Concentrations. <br /> The USEPA Region 9 has developed PRGs for evaluating and cleaning up <br /> contaminated sites. PRGs are risk-based concentrations that assist risk <br /> assessors and others in initial screening-level evaluations of environmental <br /> measurements without incorporating site-specific information. <br /> PRGs are guidelines, not enforceable standards. The guidelines are used for <br /> site "screening" and as initial cleanup goals if applicable. PRGs are not de facto <br /> cleanup standards and should not be applied as such. However, they are helpful <br /> in providing long-term targets to use during the analysis of different remedial <br /> alternatives. <br /> USEPA provides PRGs for both residential and industrial properties. Relevant <br /> exposure pathways include direct exposure and leaching to groundwater. <br /> 7.1.2 COCs in Groundwater <br /> Potential ARARs for groundwater include the following: <br /> • Basin Plan WQOs, <br /> • California Department of Public Health Primary and Secondary Maximum <br /> Contaminant Levels (MCLs) for drinking water, <br /> • USEPA Primary and Secondary MCLs for drinking water, <br /> • USEPA and National Academy of Sciences (NAS) Drinking Water Health <br /> Advisories or Suggested No-Adverse-Response Levels (SNARLs) for <br /> toxicity other than cancer risk, <br /> • USEPA Toxicity Characteristic Threshold, <br /> • USEPA Region 9 PRGs for tap water <br /> • Site-specific RBTCs. <br /> Under Water Code Section 13304, State Water Resources Control Board <br /> Resolution Number 92-49 requires cleanup of groundwater to background, or if <br /> that is not reasonable, to an alternative level that is the most stringent level that <br /> is economically and technologically feasible in accordance with Title 23, <br /> California Code of Regulations (CCR) Section 2550.4. Any alternative cleanup <br /> level to background must: <br /> 1. Be consistent with the maximum benefit to the people of the state, <br /> 19 <br />