C150301 feas study - Laserfiche WebLink

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Repair of the ditch above Hi�hwav 24 During the August 2009 tour, it was noted that the earthen ditch is quite close to an embankment above Highway 24 and the material on the highway side of the ditch is unstable. A repair to this area of the ditch is envisioned to be a suitable lining to stabilized the ditch itself and prevent seepage from further destabilizing the earth adjacent to the ditch. This repair is envisioned before the ditch is made operational in the Spring of 2010. Canal Lininq Lining of the canal is considered to be an improvement that could provide significant reduction of seepage and improve overall canal operations and delivery consistency to shareholders. Final selection of the lining material for each reach to be piped will be made during detailed design. Phreatophvte Removal The ditch has a number of areas of phreatophyte encroachment. In places, the ditch rider must walk in the ditch just to inspect the ditch and pass through. Phased work is envisioned to remove phreatophytes in a three year program. Canal reaches will be identified, the removal work will be competitively bid, and work will be contracted with one or more contractors. Headqate Repair. Replacement, or New Installation The Board and the superintendent have identified locations where old, unused headgates will be removed. In other cases headgates need repair or new headgates and flow measurement devices (flumes) must be installed. Budgetary probable costs for this work have been developed but this will be affirmed after a standardized headgate and flume arrangement has been developed. Probable Construction Costs Table 2 shows a summary of all of the prioritized capital improvements that have been identified. The Board and the superintendent broke the various discrete cost elements of the project into three rankings for priority — Year 1(highest priority), Year 2(moderate priority), and Year 3(lower priority). If the complete package of improvements is approved for a CWCB loan, then all of these improvements are envisioned to be accomplished between the spring of 2010 and the spring of 2012 as is further described in the next section. Year 1(highest priority) improvements total $153,400, Year 2(moderate priority) improvements total $32,200, and the Year 3(lower priority) improvements total $12,000 for a grand total of $204,600. A loan request is made to CWCB in the amount of 90% of $204,600 or $184,140. Aqua Engineering, Inc. Riverside Ditch � Allen Extension Co., Feasibility Study October 2009 - 6 -