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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Project Description and Alternatives <br /> <br />The purpose of this project is to provide a means for the CDC to continue providing irrigation <br />water to shareholders while minimizing the occurrence, of future failures of their diversion <br />structure. Four alternatives were considered: <br /> <br />1. The no-action alternative. <br />2. Reconstruct the diversion using steel sheet piling ($900,000). <br />3. Reconstruct the diversion using roller compacted concrete ($1.5 million). <br />4. Reconstruct the diversion using grouted rock ($1 million). <br /> <br />Alternative No.1 was considered unacceptable since it means the CDC could not deliver water <br />to its shareholders" <br /> <br />Alternative No. 2 was ruled out because of the potential for large buried rock in the channel <br />bottom. <br /> <br />Alternative No.3 was ruled out due to cost. <br /> <br />Alternative No.4 was selected, since it is considered to be the least costly reliable approach. <br /> <br />The selected alternative, Alternative No.4, involves construction of a grouted rock diversion <br />structure. This structure will be anchored into the riverbed and have wing walls of steel <br />reinforced concrete" An emergency spillway section will be constructed around the right <br />abutment and armored with riprap" <br /> <br />The EI Paso County Office of the Natural Resources Conservation Service (NRCS) has <br />prepared engineering designs and cost estimates for the project. Conceptual plans as prepared <br />by the NRCS are attached in the back pocket of this study. <br /> <br />The estimated cost of the completed project is $1 million. The cost breakdown is summarized in <br />Table 1. The NRCS Preliminary Design report and detailed cost estimate are included in <br />Appendix D. <br /> <br />Table 1. Chilcott Ditch Company - Diversion Structure Project - Cost Estimate <br /> <br />Item Quantity Unit Unit Price $ Amou nt $ <br />Mobilization 1 Job 32,000 $32,000 <br />Channel Excavation 26,000 C.Y. 3.48 $90,480 <br />Earthfill 13,450 C.Y. 4.64 $62,408 <br />Steel Sheep Pile 14,890 Sq. Ft. 23.92 $356,169 <br />Loose Rock Riprap 3,700 Tons 30 $111,000 <br />Grouted Rock Basin Floor 1,789 Tons 20 $35,780 <br />Grouted Rock Chute 4,122 Tons 30 $123,660 <br />Concrete 1,182 C.Y. 105 $124,110 <br />Contingency 1 Job 64,000 $64,000 <br />Total $1 million <br /> <br />Chilcott Ditch Company <br />Diversion Structure Feasibility Study <br />November 1999 <br /> <br />Page 9 of 12 <br />