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CLEANUP AND ABATEMENT ORDER NO. R5-2006-0720 NESTLE USA, INC. RIPON, SAN JOAQUIN COUNTY cannot be achieved, the CAO should require the discharger(s) to abate the effects of the discharge. Abatement activities may include the provision of alternate water supplies."(Enforcement Policy,p. 19). 33. The Regional Board's Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, 4`h Edition (hereafter Basin Plan) designates beneficial uses of the waters of the State, establishes water quality objectives (WQOs)to protect these uses, and establishes implementation policies to implement WQOs. The beneficial uses of the groundwater beneath the site are domestic, municipal, industrial, and agricultural supply. 34. The wastes detected in groundwater beneath the Facility (see Finding 12) are not naturally- occurring, and some are known human carcinogens. Pollution of groundwater with these wastes impairs the beneficial uses of the groundwater. 35. WQOs listed in the Basin Plan include numeric WQOs, e.g., state drinking water maximum contaminant levels (MCLS), and narrative WQOs, including the narrative toxicity objective and the narrative tastes and odors objective for surface and groundwater. Chapter IV of the Basin Plan contains the Policy for Application of Water Quality Objectives, which provides that "[w]here compliance with narrative objectives is required (i.e., where the objectives are applicable to protect specified beneficial uses), the Water Board will, on a case-by-case basis, adopt numerical limitations in orders which will implement the narrative objectives." The numerical limits for the constituents of concern listed in the following table implement the Basin Plan WQOs. Constituent WOO Reference Tetrachloroethene 0.06 California Public Health Goal in Drinking Water—Office of Environmental Health Hazard Assessment Trichloroethene 0.8 gg/I California Public Health Goal in Drinking Water—Office of Environmental Health Hazard Assessment 1,1,1-trichloroethane 200 I California Department of Health Services Primary MCL cis-1,2-dichloroethene 6.0 pgd California Department of Health Services Primary MCL trans-1,2-dichloroethene 10 California Department of Health Services Primary MCL 1,1-dichloroethene 6 California Department of Health Services Primary MCL 1,1-dichloroethane 5 California Department of Health Services Primary MCL 1,2-dichloroethane 0.4 California Public Health Goal in Drinking Water—Office of Environmental Health Hazard Assessment Vinyl chloride 0.05 pg/I California Public Health Goal in Drinking Water—Office _ of Environmental Health Hazard Assessment Methylene chloride 2.5 pg/I Cal/EPA Cancer Potency Factor as a Drinking Water Level* Chloroform 1.1 pg/I Cal/EPA Cancer Potency Factor as a Drinking Water Level* Bromoform 2 USEPA Health Adviso gg/I Micrograms per liter * One-in-a-million Incremental Cancer Risk Estimate for Drinking Water MCL Maximum Contaminant Level USEPA United States Environmental Protection Agency 9