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..... ..... ""'RESOURCE ..... ^^^^^ E N G I N E E R I N G I N C Mr. Gil Lee Central Aggregates PO Box 26 Rifle CO 81650 RE: Gravel Pit Water Rights Dear Gil: September 15, 1998 Following our last telephone conversation I visited the U.S. SCS office in Glenwood Springs to review aerial photographs for the determination of historic irrigation on your gravel pit site. A review of 1968 and 1989 photographs revealed that as mush as 22 t acres had been irrigated. This would be consistent with .5 cfs of Pioneer Ditch water right which you said is associated with the property. The land is no longer irrigated but could generate about 40 to 45 acre feet of historic consumptive use credit which could be used to augment future evaporative losses from the gravel pit. The evaporation rate is 3.19 acre feet/acre per year but much of this occurs during the non-irrigation season when there is no call on the Colorado River. About 2.7 AF occurs during the irrigation season and only about 2.1 AF is during the call period. In other words, you will need 2.1 AF of augmentation water for each acre of pond surface. We can claim about 45 AF of historic consumptive use from the 22 acres of historic irrigation which will account for about 21 acres of pond evaporation. The remaining amount will require augmentation from other sources. Other sources could include on-site storage which can be isolated from ground water. It could also be storage in Ruedi Reservoir, Green Mountain Reservoir, or Wolford Mountain Reservoir. Please let me know how much exposed pond surface area you will have after final reclamation so we can calculate your need. Sincerely, RESO E ENGINEERING, INC. Paul S. Bussone, P.E. Water Resources Engineer PSB/mmm 468-1.0 oiaow.,rta.ase.woa Consulting Engineers and Hydrologists 909 Colorado Avenue ^ Glenw~ Springs, CO B1 601 ^ (970) 94777 ^ Fex [g70j 945-11 37