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I I I I I I I I I I I I I I I I I I I VOLUME OF EARTH FOR EMBANKMENTS AT ALTERNATIVE DAM SITES (million cubic yards) Capacity of Reservoir 10,000 acre-feet 15,000 acre-feet 20,000 acre-feet 25,000 acre-feet Cactus Park Leroux Creek Dirty George Cedar Mesa 2.40 3.30 1;.20 5.10 5.60 7.70 9.90 11.80 2.05 2.95 3.80 4.50 3.68 5.60 7.56 9.50 For each capacity of storage, a reservoir at the Leroux Creek site would require a substantially greater volume of earth for the dam than the other sites. As the cost of the embankment would increase generally in proportion to the volume of earth required, the Leroux Creek site would not be cost effective. For each capacity of storage, a new dam at the site of the existing Cedar Mesa Dam would require the second largest volume of earth, after the Leroux Creek site. It is unlikely that these quantities of earth would be available, except by being hauled considerable distances to the site from lower elevations. Access to the site is difficult. There could be foundation problems for a large dam at this site due to geological conditions on Grand Mesa. Finally, the U.S. Forest Service would, at best, grant its approval only after lengthy procedures and there would be no assurance of ever receiving their approval. The volume of earth required for an embankment at either the Dirty George or Cactus park sites would be similar. In fact, the volume at the Dirty George site would be somewhat smaller. However, a reservoir at the Dirty George site would be farther away from the irrigated area to be served, and water could not be transferred into this reservoir from other basins. Finally, a dam at the Cactus Park site would only require somewhat more earth for the embankment than a dam at the Dirty George site, without the disadvantages cited above for that site. IV-IO