ARCHIVED REPORTS_2011 REVISED FEASABILITY STUDY

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Nestle USA, Inc.—Ripon, CA January 28, 2011 2011 Revised Feasibility Study 2. Not unreasonably affect present and anticipated beneficial use of such water, and 3. Not result in water quality less than that prescribed in the Basin Plan and applicable Water Quality Control Plans and Policies of the State Board. RWQCB's Basin Plan"" specifies numeric WQOs for the various CDCs. Chemical-specific regulations, plans and policies which pertain to the Study Area, include the National Primary Drinking Water Standards developed under the Safe Drinking Water Act and the State of California Primary Drinking Water Standards. Primary MCLs address health concerns, while Secondary MCLs address aesthetics such as taste and odor"x The National Primary Drinking Water Standards establish health-based MCLs for chemicals in "community and non-transient, non-community water systems""""' Similarly, the State Drinking Water Primary Standards (SMCLs) establish water quality standards for public water systems"""" These regulations pertain to the Study Area since most of the groundwater has the potential to be (or currently is) used as a drinking water source. Water supplied to the public cannot contain COCs exceeding Primary MCLs""""' MCLs developed by the California Department of Health Services consider economic factors and technical feasibility. Other requirements were considered and determined not to pertain to the Study Area remedial action. For example, the National Secondary Drinking Water Standards have not been exceeded within the Study Area. MCL Goals (MCLGs) do not apply, since they either equal the MCL or are zero (only non-zero chemical-specific standards are typically invoked). Notification of the potentially harmful on-site CDCs is posted at both treatment systems as per the California Safe Drinking Water and Toxic Enforcement Act (Proposition 65). 7.2 Action-Specific Requirements The Federal Clean Water Actxxx'v, as amended by the Water Quality Act of 1987, authorizes states to adopt water quality standards""" protective of beneficial uses of each water body. Each authorized state designates uses for each water body and establishes anti-degradation requirements. The Federal Clean Water Act also controls the discharge of chemicals to navigable waters. The National Pollutant Discharge Elimination System (NPDES) Program, 40 CFR Parts 122 to 125, requires permits for the discharge from any point source to waters of the United States. Similarly, the State of California Porter-Cologne Water Quality Act (Title 23, Subchapter 9), in addition to protecting the waters of the State (including groundwater) from degradation, establishes WDRs for point sources. WDRs may apply to the injection of reagents to groundwater in support of in-situ remediation technologies. The California Inland Surface Waters Plan"""' establishes specific concentrations for surface water discharges, for non-ocean discharges within the State. These requirements may pertain to any remedial 20