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-7- Domes ti c \~as tes from the U. S. Fores t Servi ce recreati ona 1 areas on Grand t!esa are qenera lly contai ned in sealed vaults; hO~lever, a few sentic tanks are in use. It is expected tha t the future ~/as tes associ ated wi th recreati ona 1 acti vi ti es on the Grand ~1esa and the proposed reservoi rs \~i 11 be ade- quately treated in systems that will not discharge treated effluent to the lakes or reservoirs. Range cattle and dairy operations are sources of untreated oroanic ~Iastes in the Project areas. AlthouClh the quantity of ~'aste reachino the Gunnison River from these operations is not kno~m, these waste sources are not presently causing any known water quality problems in the area. :Jutrients, pesticides, herbicides, heat and radioactive substances discharned to basin streams are emerl1ing water quali ty nroblems in certain areas of the Colorado River [)asin. HO\'lever, these ~Iater quality problems are not expected to be siqnificant in the Project area durinq the period of study. l'lith adequate treatment of wastes at the source, no \qater quality problems are anticipated from the other industries in the Proiect area. PHYSICAL AND ECONOMIC IMPACTS The major chara,cteristics \'Ihich deterMine the suitability of local Vlater sunnlies for irrioation are the concentrations of total dissolved solids, boron and the relative concentration of sodium to other cations (sodiUM adsorption ratio). Haters in the Project area have been demon- strated by nast use to be sui table for irrioation of crops presently oro\'ln. Uron completion of the Project tfle averar)e annual total dissolved solids (TDS) concentrations of the Haters at Electric I'lountain and Cactus Park Reservoir will be about 115 n'1/1 and 65 m'1/l respectively. The sodiUM adsorption ratio (SAR) of \1ater to be used in the . Project area is I'Jithin the tolerance limit of crors or0l1t1. Goron concentrations are 101'/ and, therefore, have no effect on irrioated crops. It is assumed that in the future municipal and donestic \'Iastes in the Project area ~Iill be treated by a Vlaste~later treatnent plant located near the Gunnison River. The estimated miniMUM floH of the Gunnison River Dast the Project area which \'Iould be required to assim- ilate the rro.iected municinal and domestic Haste load after treatnent is about 7.0 cfs. It is estimated that this flow will allo~1 a dissolved oxyqen concentration of 5.0 MQ/l to be maintained to meet the state \later 'luality standards criteria for this reach of the Gunnison River