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Left Hand Ditch Company October 18, 2013 (Updated October 21, 2013) Page 4 of 7 Agenda Item 8b Project Description The purpose of this loan request is to restore the Company system it its pre -flood condition. The Company has retained Duane H. Smith, P.E. of Smith Geotechnical/Engineering Consultants as the primary engineer for this project. Because of the extensive nature of the damage to the system, and the urgency to move forward on various components simultaneously, the Company may retain other Professional Engineers to develop plans and designs for individual structural project components. Alternatives considered were: Alternative 1 — Do Nothing: Failure to repair the Left Hand Ditch system would lead to the abandonment of multiple water rights within the system. Numerous irrigators within the system would unable to receive water. The Company would not be able to supply water to the Left Hand Water District which would harm the potable water supply for the Left Hand Valley area. Alternative 2 — Rebuilding Collaboratively with Improvements: The Company identified flood mitigation measures and possible fish passage structures that could enhance its system beyond its pre -flood condition. Depending on the availability of funding and the feasibility of enhancements, the Company would be willing to consider implementing these items on a case by case basis. However, because funding sources for enhancements are unidentified, implementing this alternative is not practicable at this time. Selected Alternative 3 — Restore system to pre -flood condition: Left Hand Creek Parshall Flume and Recorder Station • Replace Parshall flume and recorder station. Ensure device operates to EO's Standards. Left Hand Valley Reservoir • Debris removal at the inlet into the lake. • Repair Dam spillway, dam access road, secondary spillway. Left Hand Valley Diversion • Restore Left Hand Creek to its pre -flood channel in this area. • Repair Left Hand Valley filler ditch. Ensure measuring device operates to SEO's Standards. Crocker Ditch • Restore Left Hand Creek to its pre -flood channel in this area. • Remove debris from ditch. Ensure device operates to SEO's Standards. Allen's Lake Filler Canal Head Gate (Also Lake Ditch inlet and Toll Gate Ditches headgate) • Survey and design new dam and headgate structure. • Replace diversion dam and headgate structure. Ensure device operates to SEO's Standards. • Coordinate with Boulder County Transportation. • Perform grade survey to determine if the Parshall Flume is still useable. • Replace upper section of the ditch Allen's Lake Filler Canal at Geer Canyon Road • Replace culvert where ditch crosses Geer Canyon at road. • Remove debris in this area. Table Mountain Ditch