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F-4. IGA WITH THE US ARMY CORPS OF ENGINEERS FOR THE CAVE BUTTES DAM REHABILITATION PROJECT Approve Intergovernmental Agreement FCD IGA2012A018 for the Cave Buttes Dam Modification Project between the US Army Corps of Engineers (USACE) and the Flood Control District of Maricopa County (District). The total estimated IGA cost is $499,000 including approximately 25 percent of optional funds that require District approval before being eligible for expenditure. The USACE has determined that there is no federal funding available for the foreseeable future. This IGA funds the review, approval, and oversight of a required 408 permit with the USACE in accordance with the 221 agreement between the USACE and the District. Without this IGA the USACE review and issuance of the 408 permit would take several years due to lack of Federal funding. This delay would hamper the District’s ability to improve public safety. The IGA shall become effective when signed by the USACE and shall expire with the Federal Fiscal Year 2016. The Cave Buttes Dam Modification Project best meets District goals and objectives related to dam and public safety. The modifications to Cave Buttes Dam include an additional outlet to reduce the maximum drawdown time from 50 to less than 25 days and to implement a seepage control and monitoring system. These modifications will significantly improve the operational safety of Cave Buttes Dam and insure that the operational life of this structure will be significantly increased. The District is nearing the completion of the 30 percent design for the new outlet. Without this agreement the USACE has stated their review of the 30 percent design may take 3 to 4 years. With District funding the USACE review time will be expedited. This item impacts All Supervisorial Districts. (C-69-13-058-3-00)