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TEL No . Rnr 28 ,94 10=32 Na .003 P .03 <br /> CALIFORNIA CONFINED ANIMAL REGULATIONS 2 <br /> C) Retention ponds and manured areas at confined animal facilities in <br /> operation on the effective date of this section shall be protected from <br /> inundation or washout by overflow from any stream channel during 20-year <br /> peak stream flows. Existing facilities that are protected against 100- <br /> year peak stream flows must continue to provide such protection. <br /> d) New facilities shall be protected against 100-year stream flows. <br /> e) The determination of peak stream flows shall be from data provided by a <br /> recognized federal, state, local, or other agency. <br /> f) Retention ponds shall be lined with or underlain by soils which contain at <br /> least 10 percent clay and not more than 10 percent gravel or artificial <br /> materials of equivalent impermeability. <br /> g) Facility wastewater, collected precipitation and drainage may be <br /> discharged to use or disposal fields operated according to Section 2563 of <br /> this article or to wastewater treatment facilities approved by the <br /> appropriate regional board. <br /> 2563. Use or Disposal Field Management <br /> a) Application of manure and wastewater to disposal fields or crop land shall <br /> be at rates which are reasonable for the crop, soil , climate, special <br /> local situations, management system, and type of manure. <br /> b) Discharges of facility wastewater to disposal fields shall not result in <br /> surface runoff from disposal fields and shall be managed to minimize <br /> percolation to ground water. <br /> 2564. Management of Manured Areas <br /> a) Manured areas shall be managed to minimize infiltration of water into <br /> underlying soils. <br /> 2565. Monitoring <br /> a) Regional boards may require confined animal facility operators to <br /> undertake a monitoring program as a condition to the issuance or waiver of <br /> Waste discharge requirements. <br />