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Frequently Asked Questior 3 2 June 2010 Waste Management Plans General Order No. R5-2007-0035 For Existing Milk Cow Dairies 4. What if the flood level for my production area is extremely high, like 10 feet deep? The requirement to provide protection from the 20-year ARI flood applies only to certain dairies which started operations prior to 1984. All dairies which began operations after 27 November 1984 (and some which began operations prior to that date, see provisions B.3 and B.4 of the General Order) have been required by the Title 27 regulations of the State Water Resources Control Board, which became effective in 1984, to be protected against 100-year peak stream flow. It is anticipated that only the oldest facilities would have difficulty complying with the 20-year ARI flood requirement. If a facility which began operations after 27 November 1984 is now unable to comply with the requirement for protection against the 100-year peak stream flow, an explanation will need to be provided in the WMP describing why the facility began operations in violation of this Title 27 requirement. Several steps should be taken in the event that the FEMA maps indicate that the production area cannot be protected from the appropriate peak stream flow. First, verify that the flood depth projected by FEMA appear to be realistic. The MT-1 form described under item #3 above can also be used to request a LOMR (Letter of Map Revision) if fill was used prior to dairy construction to raise the height of the production area. The LOMR would recalculate flood risk based on the site-specific conditions of the production area. There may be a fee and special documentation required for this service; contact FEMA for more information. If the flood depth appears to be realistic, and preventing flooding of the production area would require unrealistic actions, contact your Central Valley Water Board office for instructions. Remember that elevated lagoons may result in protection of the lagoon contents from most flood events, as long as the sides of the lagoon are protected from erosion by floodwaters. The areas that need to be protected from flooding are typically, in order of importance: lagoons, settling basins, manure storage areas, corrals, and silage storage areas. Please note — any berming of the production area to provide flood protection can't modify the flood zone such that it increases flooding in some other part of the drainage system. Such a change creates liability for the dairy by increasing flooding of other properties. 5. My dairy was originally put in operation prior to 27 November 1984. However, I have expanded one or more of my existing lagoons/added a new lagoon. Can I still just comply with the requirement for protection of the production area from the 20- year peak stream flow or did changes to my lagoon make me now subject to the 100-year peak stream flow requirement? Existing milk cow dairies built or expanded after the 27 November 1984 date must be protected from the 100-year peak stream flow. In the General Order, "expansion" is defined as, but not limited to, any increase in the existing herd size (i.e., by more than 15 percent of the maximum number of mature dairy cows in the herd on 17 October 2005) or an increase in the storage capacity of the retention ponds in order to accommodate an expansion of the existing herd. Therefore, expanding an existing lagoon, or increasing storage capacity by adding a new lagoon in order to accommodate an expansion of the existing herd would