Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...

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Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment • Table 1. Estimated Installation Cost: This table documents the federal and non-federal funding sources respectively. The table shows federal expenditures under the Watershed Protection and Flood Prevention Act (PL 83-566). • Table 2. Estimated Cost Distribution: This table shows estimated costs to be charged to the PL 83-566 Funds, and those to be borne by the Sponsors. • Table 3b. Structure Data-Channel Work: This table shows important physical characteristics and geometry for the proposed channel improvements (Powerline Channel, North Diversion Channel). • Table 4. Estimated Average Annual National Economic Development (NED) Cost: This table shows the anticipated installation costs of the Preferred Alternative discounted over the evaluation period of 103 years. • Table 5. Estimated Average Annual Damage Reduction Benefits: This table summarizes flood damage reduction provided by the proposed project. It includes a summary of the agricultural and non-agricultural benefits that the proposed project would provide. • Table 6. Comparison of NED Benefits and Costs: This table summarizes the benefits and costs of the Preferred Alternative and documents the overall benefit-to-cost ratio of the proposed project. 8.6 INSTALLATION AND FINANCING 8.6.1 FRAMEWORK All works of improvement will be installed in accordance with applicable state and Federal regulations. Installation of the work will be accomplished through a Project Agreement, which defines and details the roles and responsibilities of the NRCS and the Sponsors. 8.6.2 PLANNED SEQUENCE OF INSTALLATION The major construction elements in the Preferred Alternative can be divided into the Powerline Channel, the North Diversion Channel, and removal/breach of the existing dam embankment. The new Powerline Channel, North Diversion Channel, and removal of the existing dam embankment should not occur until the work on the rehabilitated Vineyard Road FRS is completed (under the Vineyard Road and Rittenhouse FRS Supplemental Watershed Plan and Environmental Assessment Project). However, the order of construction sequence for the Preferred Alternative is to construct the Powerline Channel first beginning with the confluence of the channel into the Vineyard Road FRS. The channel should be constructed from downstream to upstream and include the major side/confluences with Siphon Draw and Weekes Wash. The North Diversion Channel improvements could be constructed next. Once construction of the channels are completed, the existing Powerline FRS and IDSM embankments may be removed and the footprints stabilized. Erosion protection measures may be placed when grading is completed for the specific elements. USDA- NRCS Page 8-5 January 2013 Kimley-Horn and Associates, Inc.
Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment 8.6.3 RESPONSIBILITIES The responsibilities of the Sponsors and the NRCS, set forth in the original work plan, will continue in accordance with this Supplemental Watershed Plan-EA and with the Supplemental Watershed Agreement. The NRCS will provide technical assistance to the Sponsors with the design and construction of the decommissioning project. NRCS will: • Provide contract administration technical assistance • Provide construction management technical assistance • Provide financial assistance equal to 65% of project costs, not to exceed 100% of actual construction costs • Execute a cooperative agreement with the Sponsors before either party initiates work involving funds of the other party. Such agreements will set forth in detail the financial and working arrangements and other conditions that are applicable to the specific works of improvement. The Sponsors will: • Secure all needed permits, easements (if required), and rights for installation, operation, and maintenance of the new channels. • It is anticipated that some utilities will require relocation and/or protection (including a waterline located along the existing Powerline FRS auxiliary spillway which is owned by others). Utilities need to be researched as part of the design phase of the project. Utility relocations are the responsibility of the utility owner. • The Sponsors will provide leadership in updating their existing Emergency Action Plan (EAP) prior to construction and will update the EAP annually with local emergency response officials. The purpose of the EAP is to outline appropriate actions and to designate parties responsible for those actions in the event of a potential failure of the channels. • Execute an updated Operation and Maintenance agreement with NRCS for the Powerline Channel and North Diversion Channel. • Execute a cooperative agreement with NRCS before either party initiates work involving funds of the other party. Such agreements will set forth in detail the financial and working arrangements and other conditions that are applicable to the specific works of improvement. • Provide nonfederal funds for cost-sharing of the project at a rate equal to, or greater than, 35% of project costs. • Provide local administrative and construction management services necessary for installation of the project. • Comply with all applicable Federal, State, and local floodplain management laws, ordinances and regulations. • Be responsible for enforcing all associated project easements and rights-of-way. USDA- NRCS Page 8-6 January 2013 Kimley-Horn and Associates, Inc.
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DRAFT SUPPLEMENTAL WATERSHED PLAN A
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Powerline Flood Retarding Structure
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