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Stockton Propeller, Inc. - 7 - 10 May 2022 Order R5-2022-0806 Water Board, 2022b). Legal Authority 21 .The Central Valley Water Board's Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fifth Edition, Revised 2018 (Basin Plan) designates beneficial uses of the waters of the State, establishes water quality objectives (WQOs) to protect these uses, and establishes policies to implement WQOs. The Basin Plan designates the groundwater at the Site for use as municipal and domestic supply (MUN), agricultural supply (AGR), industrial service supply (IND), and industrial process supply (PRO). 22.The Basin Plan contains a narrative WQO for chemical constituents which requires, in part, that groundwater not contain chemical constituents in concentrations that adversely affect any beneficial use. For MUN-designated groundwater, the Basin Plan incorporates the primary and secondary drinking water MCLs listed in California Code of Regulations title 22, division 4, chapter 15. 23.The Basin Plan also establishes narrative WQOs for tastes, odors, and toxicity. The tastes and odors WQOs require in part that groundwater not contain substances in concentrations that cause nuisance, adversely affect beneficial uses, or impart undesirable tastes and odors to municipal and domestic water supplies. The toxicity WQO requires, in part, that groundwater be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, and aquatic life. 24.This Order is issued pursuant to Water Code section 13267, subdivision (b)(1), which provides in pertinent part as follows: [T]he regional board may require that any person who has discharged, discharges, or is suspected of having discharged or discharging, or who proposes to discharge waste within its region ... that could affect the quality of waters within its region shall furnish, under penalty of perjury, technical or monitoring program reports which the regional board requires. The burden, including costs, of these reports shall bear a reasonable relationship to the need for the report and the benefits to be obtained from the reports. In requiring those reports, the regional board shall provide the person with a written explanation regarding the need for the reports and shall identify the evidence that supports requiring that person to provide the reports. 25. Based on the evidence discussed in the preceding Findings, the Central Valley Water Board suspects that hazardous wastes have been and continue to be discharged at and from the Site in a manner that could affect the quality of the