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Frequently Asked Questior 4 2 June 2010 Waste Management Plans General Order No. R5-2007-0035 For Existing Milk Cow Dairies make you subject to the 100-year peak stream flow requirement. (Note: Increasing the storage capacity of your retention pond(s) after 27 November 1984 for the express purpose of achieving compliance with the requirements of the General Order would not subject you to the 100-year peak stream flow requirement, provided said modification was made to accommodate only the existing herd size.) Storage Calculations 1. What herd size should be used to calculate storage needs? Should the storage calculations be based on current herd size or maximum herd size allowed under the General Order? In general, the storage calculations should be based on maximum herd size of mature dairy cows allowed under the General Order plus the maximum number of support stock expected to be kept at the dairy. If a smaller herd size is used, the number of animals cannot be increased above that number until a revised WMP for the larger number of animals (up to the maximum allowed under the GO) is submitted to the Central Valley Water Board proving that storage is adequate. - 2. What is the herd size that is used to calculate storage needs in the online program and where did it come from? The online Waste Management Plan can import the herd size from the Preliminary Dairy Facility Assessment (PDFA) or the most recent annual report. However, this is frequently not the most appropriate herd size to use for the calculations (see answer to #1, above). If the imported herd size numbers are not appropriate, the numbers will need to be overwritten with the correct herd size numbers. 3. If my Waste Management Plan indicates that I need more storage, can I reduce my herd size, thus reducing my storage needs, instead of retrofitting/enlarging my ponds? Yes. However, before you can increase your herd size in the future (up to the maximum allowed under the General Order) you will need to submit a revised Waste Management Plan to the Central Valley Water Board demonstrating that you have adequate storage for the increased herd size. 4. Where do the Report of Waste Discharge (ROWD) herd size and maximum herd size numbers come from in the online Waste Management Plan? These figures were submitted to the Central Valley Water Board as part of the 2005 ROWD and were mailed to each dairy in 2007 as part of the letter placing the dairy under the General Order. If you do not know the ROWD herd size and maximum herd size for your dairy, please contact the Central Valley Water Board and we will look up that information for you. These figures will need to be hand-entered into the online Waste Management Plan.