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Flumes. Flumes are envisioned in three reaches totaling about four (4) percent of the <br />Conveyance A alignment length where moderately steep slopes in Morrison Formation (Jm) are <br />traversed. The construction methodology and constructability is for the flumes is described in <br />Appendix B and summarized in Table 3. <br />Siphons. There are four siphon reaches on the Conveyance A alignment. Taken together, these <br />reaches comprise only about one (1) percent of the total alignment. The construction <br />methodology and constructability is for the tunnels is described in Appendix B and summarized <br />in Table 3. The Geologic unit descriptions for the units along the conveyance alignment are <br />summarized in Table 2. <br />Based on available information reviewed for this study, site reconnaissance, and experience with other <br />sites in similar geologic settings, it does not appear that there are any fatal flaws to construction of the <br />conveyance facilities proposed to supply the Grand Valley Dam and Reservoir. However, as noted in <br />the above discussions, there are a number of conditions and issues that will require thorough <br />investigation, careful design, and close attention to QA/QC during construction. All of these conditions <br />will result in higher costs of both design and construction to mitigate them than would be the case if they <br />were not present. <br />Table 2. Key for Geologic Units in Table 3 <br />Jm <br />Alluvial Deposits <br />Alluvial Terrace Gravels <br />Mancos Shale Bedrock <br />Dakota Sandston/Burrow <br />Morrison Formation <br />22 <br />AECOM <br />Formatior <br />2/22/10 , <br />