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GA-5 • Reservoir, is located on an unnamed tributary to Yellow Creek, about 8-10 miles south of the White River. Several groundwater rights, totaling 40 cfs of diversions, are also associated with the lease areas. Of 'the NaTec water rights, the most pertinent is NaTec's new water well Na26-90-1, well permit no. 036778 with 177 acre-feet decreed. Other groundwater rights related to wells near the lease area are identified on Table GA-1 with an asterisk (*). NaTec has obtained a Substitute Water Supply Plan from the State Water Engineer's office. Surface water rights near Rio Blanco, CO have been purchased to provide augmentation water based on NaTec's water usage. The augmentation water rights are the Larson (2.50 cfs decree), Morgan #1 (1.00 cfs) and Morgan #2 (0.40 cfs) diversions. GA.2.4 Existinq_and Potential Regional Uses The majority of the surface waters of the area are used for • irrigation or stock water purposes. Alley (1982) has suggested an annual consumptive use of surface water for irrigation purposes of 1 to 3 acre-feet per acre for the area drained by the White River. Week et al, (1974) has estimated that depletions resulting from irrigation constitute about 25 percent and 5 percent of the natural flow of Piceance and Yellow Creeks, respectively. Vast deposits of oil shale are contained in the Piceance Basin. Future development of this oil shale resource will require a large e~mount of water. In addition, the increases in population accompanying oil shale development will require additional water. Alley (1982) suggested that water use estimates for an oil shale industry would vary from 1 to 6 barrels of water per barrel of oil (BW/BO) produced, with an average consumptive use of 3 BW/BO. The wide range in projected use is, in part, related to different methods of oil shale mining, extraction, processing and reclamation. Assuming a •