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Reissued Waste Discharge Requirements General Order R5-2013-0122 8 Existing Milk Cow Dairies outdated design or need for maintenance or both. Historic operation of these dairies has often resulted in adverse effects on the water quality. Groundwater data are needed to determine the existence and magnitude of these impacts. If data document impacts, continued operation of dairies without waste management improvements will perpetuate the ongoing adverse water quality effects caused by the generation and disposal of dairy waste. This Order includes time schedules for compliance for dairy operators to implement improvements if groundwater data indicate that certain types of facilities/practices are not protective of groundwater quality. STATE ANTI-DEGRADATION POLICY(RESOLUTION 68-16) 26. The State Anti-Degradation Policy prohibits the Central Valley Water Board from authorizing the degradation of high-quality groundwater unless it has been shown that: a. The degradation is consistent with the maximum benefit to the people of the state. b. The degradation will not unreasonably affect present and anticipated future beneficial uses. c. The degradation does not result in water quality less than that prescribed in state and regional policies, including violation of one or more water quality objectives, and d. The discharger employs best practicable treatment or control (BPTC) to minimize degradation. 27. This Order places restrictions on the discharge of wastes from dairy facilities that are intended to prevent pollution and nuisance conditions from occurring or persisting. Though the Board recognizes that degradation of high-quality groundwater will still occur pursuant to this Order, the implementation of nutrient management plans, waste management plans, enhanced management practices within the production area, and improved containment features for new and expanding dairy wastewater retention ponds will limit the amount of degradation that will occur under this Order. Degradation will be limited so that discharges from dairy facilities will not cause long-term impacts to beneficial uses. Where immediate compliance with water quality objectives cannot be achieved, this Order includes a time schedule for compliance for the implementation or modification of waste management practices. 28. Consistent with the State Anti-Degradation Policy, this Order establishes requirements and standards that will result in the implementation of BPTC measures to limit the degradation caused by dairy discharges. The following is a general description of what the Board considers to be BPTC for specified areas of a dairy operation: