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• <br />Ms. Luriine Curran <br />April 13, 1999 <br />Page 2 d 4 <br />'augmented" pursuarrt to an augmentation plan approved by the Division 5 Water Court or <br />pursuant to a Substitute Water Supply Plan (SWSP) approved by the State Engineer. <br />SOURCES OF WATER SUPPLY <br />Tri-River has negotiated with the landowner, Mr. Jim Yust, for the lease of a portion of the <br />water rights he owns in the Loback Ditch as necessary for the operation of the sand and gravel <br />mining operation. This ditch averts from the Btue River and irrigates meadow lands on the west <br />side of the Blue River and south of the Cdorado River. The Lobaclc Ditch is decreed for four <br />separate water right priorities that cumulatively total about 75.8 ds. All of these priorities are <br />technically junior to the corrlydling water right on the Cdorado River, the 1,250cfs power right for <br />the Shoshone power plant in Glenwood Canyon. However, since this irtigation use was perfected <br />prior to 1977, its oorrtinued diversions are protected against the Shoshone 'call° by the operations <br />of the Historic User Pool (HUP) in Green Mountain Reservoir. It therefore provides an adequate <br />and sufficient irrigation water supply. <br />Mr. Yust also owns the water storage rights in Griggs Reservoir, located on Beaver Creek <br />and adjudicated for 40.8 aae-feet of storage for ingation purposes. Both the Bred flow rights of <br />the Loback Ditch and the water stored in Griggs Reservor could be used to provide the physical <br />water supply for the sand aril gravel operations. The physical water supply could also be <br />obtained from a permitted well owned by Mr. Yust near the gravel pit <br />It is recognized that prior to the time Tri-River actually begins sand and gravel washing <br />operations at the proposed Yust pit, the State Engineer require approval and implementation <br />of a temporary Substitute Water Supply Plan and eventually a couri decreed augmentation plan. <br />At that time, the necessary augmentation supply can be developed by r~ertroving from production <br />(°dryirtg up') a small amount of acreage historically irigated by the Lobactc Ditch. Historically, the <br />meadow grass on this acreage consumptively used irrigation water through the combined <br />processes of evapotranspiration. Removing the acreage from production will result in the creation <br />of consumptive use °credits' that Tarr then be used to offset the stream depletions attributade to <br />the sand and gravel washing operation. In the lCremmling area, the annual Consumptive <br />Irtigation Requiremerri (GR) is conservatively estimated to be about i.5 acre-feet per acre. <br />Accnrdirgly, it would be necessary to remove from production between 0.44 acre and 0.59 acres <br />of historiglly irigated Iand to provide 0.66 to 0.88 acre-feel of augmentation water for the <br />washing operation. Since the historic irrigation season coincides with the months of probable <br />