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<br />F." <br />~:, <br />~~ <br /> <br />~,',"'1' <br />", <br /> <br />~ <br /> <br />1i! <br />~';:,f <br />c), <br />l;.'~~ <br /> <br />q <br /> <br />'"',":<I <br />~~::1 <br />:::'-'1 <br /> <br />k,l <br />;~'r <br />-~-..1 <br /> <br />",'3 <br />&:~ <br />"1 <br />1&- <br /> <br />$':'" <br />"ji <br />, '~;1 <br />~.;~ <br />~"'-' <br /> <br />:;."", <br />.~ <br />$~;J <br /> <br />t"',e <br />~";',; <br />~:~~ <br /> <br />",~ <br />;;..., <br />~-:;1 <br /> <br />r-'1!] <br />~;l <br />,,'1 <br /> <br />'" <br />~j <br />~;, <br /> <br />CHAPTER II <br /> <br />PIAN FORMULATIOO <br /> <br />Cost Effectiveness Analysis <br /> <br />Cost estimates for the replacement water system were developed from unit <br />cost data presented in the Lower Gunnison Basin unit, Winter Water Replacement <br />preconstruction Report. Distribution system layouts were prepared for the <br />delivery locations identified from an inventory conducted by representatives <br />of the private ditches. Net annual O&M costs were determined by applying the <br />existing Tri-County Water Conservancy District domestic water rate to the <br />estimated replacement water volume, minus estimated O&M savings due to <br />discontinuing winter canal diversions. <br /> <br />Capital costs were annualized using an 8-5/8 percent interest rate over a <br />50-year period. Total annual cost associated with the Colona area winter <br />water replacement program is approximately $119,000 which results in a range <br />of potential cost effectiveness values of $136 to $256 per ton. <br />This component was therefore eliminated from further consideration. <br /> <br />Geyser well point source <br /> <br />Area Description <br /> <br />The geyser well discussed in this analysis is an abandoned petroleum <br />exploration well which regularly discharges highly saline water with a TOS <br />concentration range of 30,420 to 33,440 mg/L. It is located on the south bank <br />of the Gunnison River, about 2.5 miles southeast of Austin. <br /> <br />Research yielded little data on this well, probably due to the date of <br />the exploration-between November 1936 and April 1937. The drill hole was <br />abandoned when petroleum was not encountered at a depth of 406 feet. No <br />record exists of any attempt at plugging the well. Although a lithologic log <br />of the hole has not been found, general geologic information suggests that the <br />hole began in the Morrison Formation; penetrated the Junction Creek, Wanakah, <br />and Entrada Formations; and probably bottomed near the top of Precambrian <br />granite. The located records indicated that the well produced 100,000 to <br />250,000 cubic feet of carbon dioxide per day, but no mention was made of <br />saline water. Because there is no evidence of geothermal activity, the carbon <br />dioxide is the likely cause of the geyser effect. <br /> <br />Hydrosalinity <br /> <br />%,1 <br />:1 Both quantitative and qualitative approaches were taken to determine the <br />,~ effects of the geyser well on salinity levels in the river. <br /> <br />~~ The salt dilution method was used to quantify the surface and ground <br />~,- water contribution of the geyser well area. This technique utilizes the <br />equation relating the mixing of two liquid flow rates of know TOS <br />concentrations. <br /> <br />.' -, <br /> <br />In this case the two flows are the Gunnison River above the geyser well <br />and the combined surface and base flow components originating from the geyser <br />area. <br /> <br />18 <br /> <br />00(944 <br />