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Reissued Waste Discharge Requirements General Order R5-2013-0122 16 Existing Milk Cow Dairies contain the runoff and direct precipitation from a 25-year, 24-hour storm event. 4. Existing Ponds5 a. Dischargers conducting groundwater monitoring pursuant to an Individual Monitoring Program shall maintain and operate existing ponds in such a manner so as to constitute best practical treatment or control (BPTC) or best efforts for existing ponds, which is further discussed in the Information Sheet at page 10 (Best Practicable Treatment or Control Measures for Existing Dairy Ponds). Such operations shall be maintained throughout the development of the Summary Report that is required by Monitoring and Reporting Program R5-2013-0122, Attachment A, Section 11.12. The Summary Report is due within six years of initiating individual groundwater sampling activities or at an earlier date if required by the Executive Officer. If the monitoring data in the Summary Report indicate that Groundwater Limitation F.1 of this Order is violated, Dischargers are required to implement management practices/activities (BPTC for high quality waters or best efforts for waters that are not high quality) that will bring the facility into compliance with Groundwater Limitation F.1 on a time schedule that is as short as practicable. b. Dischargers enrolled under the Representative Monitoring Program (RMP) shall maintain and operate existing ponds in such a manner so as to constitute best practical treatment or control or best efforts as (defined/discussed) in the Information Sheet throughout the development of the Summary Representative Monitoring Report (SRMR), which is due to the Central Valley Water Board on 1 April 2019. c. Dischargers enrolled under the RMP shall implement the recommended management practices that are applicable to Existing Ponds in accordance with the SRMR and its schedule as approved by the Central Valley Water Board Executive Officer. If the SRMR indicates that the Dischargers Existing Ponds may have discharges that violate Groundwater Limitation F.1, of this Order or that such discharges from Existing Ponds may cause degradation to high quality waters, Dischargers are required to implement the approved SRMR's identified management practices/activities for Existing Ponds 5 Existing Ponds are defined to mean those ponds in operation as of 3 May 2007 when the Board issued the 2007 General Order and are not new ponds that are designed to meet the Tier 1 or Tier 2 requirements set forth in Provision C.5 of this Order.