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F-2. INTERGOVERNMENTAL AGREEMENT FOR AGUA FRIA BOULEVARD (HAPPY VALLEY ROAD ) SCOUR PROTECTION PROJECT Approve Inter- Governmental Agreement FCD 2008A007 with the Maricopa County Department of Transportation (MCDOT) to cost share the preliminary engineering design (Project Design Concept) of the Agua Fria Boulevard ( Happy Valley Road ) Scour Protection Project. Following construction of the Agua Fria Boulevard bridge, MCDOT discovered potential flaws in three bridge piers which could threaten the integrity of the bridge when subjected to flood scour. In response, MCDOT designed riprap pier scour protection (est. cost: $500,000). The Agua Fria Watercourse Master Plan – Channelization Alternative identifies a drop/grade control structure at the Agua Fria Boulevard bridge (est. cost: $2,000,000). Recognizing the drop/grade control structure would render their scour protection a “throw away,” MCDOT submitted the drop/grade control structure project to the Districts FY 2008 CIP Prioritization Procedure, and the project was recommended. MCDOT is also developing a Design Concept Report for the proposed Deer Valley Road bridge, about 2 miles downstream of Agua Fria Boulevard . The Board of Directors’ adoption of the Channelization Alternative in July 2005 (Agenda Item: C-69-05-121-6-00) authorized and directed the Chief Engineer and General Manager to negotiate agreements to implement portions of the Channelization Alternative. The agreement allows MCDOT and FCD to cost share a design study for the drop/grade control structure and related channelization between Agua Fria Boulevard and Deer Valley Road . The study will refine the design concept and cost estimate of the drop/grade control structure to protect the Agua Fria Boulevard bridge, establish the northern end of a channel segment at a logical starting point and facilitate economical construction of the Deer Valley Road bridge. This Project is located in District 4. (C-69-09-005-3-00)