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Ms. Lurline Cunan April 13, 1999 Page 3 of 4 mining operations, the timing of the historic consumptive use credits would be nearly identical to the depletions at the sand and gravel operation. As an alternative to drying up less than one acre of the land historically irrigated under the Loback Ditch, Tri-River could also enter into a 25-year Contract with the Urted Stales for water service from the Contract Pool in Green Mountain Reservoir. This water can readily be acquired and released for industrial purposes, including augmentation of industrial uses, for an annual fee of $55 per aae~oot, a relatively inexpensive option for Tri-River. SUMMARY AND CONCLUSIONS In summary, the physical water supply for the proposed sand and gravel mining operations on the Yust Ranch can be supplied from direct flow diversions through the Loback Ditch, storage water released from Griggs Reservoir or from groundwater diverted through Mr. Yust's well. The proposed sand and gravel mining operation will be performed in the dry, above the natural water fade and there will be no evaporation losses associated with the operation. However, the planned washing operation will cause a small amount of stream depletion, estimated to be between 0.66 and 0.88 acxe-foot per year (during the summer season). At such time when Tri-River commences washing operations at the pit and if requred by the State Engineer, d will be necessary to obtain approval of a temporary Substitute Water Supply Plan a an augmentation plan tlecreed in the Division 5 Water Court. To provide the augmentation water necessary to replace the stream depletions at the wash plant, about 0.6 acre of irrigated meadow under fhe Lobeck Ditch could be removed fmm production (dried up) to create replacement credits or Tri-River could enter into a corrtr`ac:t with the United Stales for water service from Green Mountain Reservor. Based on my experience, an augmentation plan usirlgt either of these sources of replacement vrater could be really implemented and appn~ved by t~ State Engineer andlor the Water Court, partia~ady in light of the small amount of depletior9 associated with the proposed operation.