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Attachment B B-4 Reissued Waste Discharge Requirements General Order No. R5-2013-0122 Existing Milk Cow Dairies A. The determinationof the necessary storage volume shall reflect: 1 . The maximum period of time, as defined in the Nutrient Management Plan (item 111.6 of Attachment C), anticipated between land application events (storage period), which shall consider application of process wastewater or manure to the land application area as allowed by Waste Discharge Requirements General Order No. R5-2013-0122 using proper timing and rate of applications; 2. Manure, process wastewater, and other wastes accumulated during the storage period; 3. Normal precipitation, or normal precipitation times a factor of one and a half, less evaporation on the surface area during the entire storage period. If normal precipitation is used in the calculation of necessary storage volume, the Waste Management Plan shall include a Contingency Plan as specified in ILC below; 4. Normal runoff (runoff from normal precipitation), or runoff due to normal precipitation times a factor of one and a half, from the production area during the storage period. If normal runoff is used in the calculation of necessary storage volume, the Waste Management Plan shall include a Contingency Plan as specified in ILC below; 5. 25-year, 24-hour precipitation on the surface (at the required design storage volume level) of the facility; 6. 25-year, 24-hour runoff from the facility's drainage area; 7. Residual solids after liquids have been removed; and 8. Necessary freeboard (one foot of freeboard for belowground retention ponds and two feet of freeboard for aboveground retention ponds). B. If the existing facility's storage capacity is inadequate, the WMP shall include proposed modifications or improvements. Any proposed modifications or improvements must be: prepared by, or under the responsible charge of, and certified by a civil engineer who is registered pursuant to California law or other person as may be permitted under the provisions of the California Business and Professions Code to assume responsible charge of such work; and include: 1 . Design calculations demonstrating that adequate containment will be achieved;