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Reissued Waste Discharge Requirements General Order R5-2013-0122 2 Existing Milk Cow Dairies the quality of the waters of the state (which includes both surface waters and groundwaters) to file a report of that discharge with the Central Valley Water Board. 5. The Central Valley Water Board generally regulates waste discharges by prescribing waste discharge requirements, which must implement the relevant water quality control plan. The Central Valley Water Board may prescribe general waste discharge requirements for a category of discharges if all the following criteria apply: a. The discharges are produced by the same or similar operations. b. The discharges involve the same or similar types of waste. c. The discharges require the same or similar treatment standards. d. The discharges are more appropriately regulated under general requirements than individual requirements. 6. In regulating waste discharges, the Central Valley Water Board implements State laws and regulations. California regulations governing discharges from confined animal facilities are contained in the Title 27 of the California Code of Regulations ("Title 27"), at sections 22560 et seq. 7. For the purposes of this Order, "existing milk cow dairies" means all dairies that were operating as of 17 October 2005, filed a complete ROWD in response to the 2005 ROWD Request Letter, and have not expanded ("expansion" is defined in Attachment E) since 17 October 2005. 8. Herd sizes at existing dairy operations vary as operators strive to maintain a consistent milk production. Maintaining consistent milk production requires a dairy operator to manage the herd by continually producing calves, some of which eventually replace the dairy's producing herd over time, while excess stock are marketed for beef production or herd replacement elsewhere. 9. Professionals at the University of California Davis estimate the normal variation in California dairy herd sizes ranges from about 10 to 15 percent. 10. For the purposes of this Order, existing herd size is defined as the maximum number of mature dairy cows reported in the ROWD filed in response to the 2005 ROWD Request Letter, plus or minus 15 percent of that reported number to account for the normal variation in herd sizes.