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• 1 ANALYSIS The Department has considered alternative methods for repairing/replacing the force main including open -cut trench method, Horizontal Directional Drilling (HDD) and aerial crossing. Open cut trenching is not feasible due to the depth of the canal, the incline of the embankment, and the potential danger to construction personnel. It is our understanding that the Indian River Farms Water Control District may not allow refurbishing of the embankment in light of the recent hurricane damage. It is also our understanding that the Water Control District desires to have aerial pipeline crossings where feasible which in this case is not structurally feasible therefore the only remaining alternative is the drilling of a replacement pipeline beneath the canal. Considering the urgency of this force main replacement because of the potential for harm to the environment should the force main break, the County Utilities Department is moving forward on installing a replacement force main beneath the canal using non -conventional horizontal directional drilling (HDD) methods. The Utility requests permission to negotiate with Treasure Coast Contracting (Sebastian Water Assessment Project General Contractor) to obtain the services of a licensed HDD sub- contractor to perform the task of pipe replacement. The additional work shall be processed through a duly authorized Change Order approved by the Board. An estimated construction cost to replace the force main is presented in Exhibit -B. The Department is currently pursuing reimbursement from FEMA and can no longer postpone repairs pending a FEMA decision. Regardless of the financial assistance available, expedient response is required to prevent a potential spillage therefore the Department proposes to use Renewal & Replacement (R&R) funds and continue seeking FEMA reimbursement funds. FEMA is conducting an investigation into the potential causes of the embankment collapse and will provide a written report of their discovery. RECOMMENDATION The staff of the Department of Utility Services recommends that the Board of County Commissioners approve the replacement of the 6 -inch force main located along the IRFWCD Lateral `T Canal and authorize the issuance of a Change Order to Treasure Coast Contracting Inc. and authorize the Chairman to execute same. An estimated construction cost (upper limit) for the pipe replacement is $70,000. It is also requested that the Chairman execute a Work Order Directive instructing Treasure Coast Contracting Inc. to proceed with the Work. The Work Order Directive instructs the Contractor to proceed with the Work and then prepare the necessary paperwork as a follow-up to the written instructions. LIST OF ATTACHMENT; Exhibit -A: Memorandum from Indian River Farms Water Control District Exhibit -B: Estimated Construction Cost Figure -1: Vicinity Map Figure -2: Elevation Photo February 1, 2000 69 BOOK 112 rAGE