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<br />W <br />l'V <br />CJl <br />1'.:l <br /> <br />Accomplishments in the Upper Colorado Reqion <br /> <br />Point Source Division <br /> <br />P:'lrcdo:: Valley Unit <br /> <br />It is estimated that Par:.dox Valley contributes about 200.000 tons of <br />salt per ye~r ~o the Dolores River in southwestern Colorado. A con- <br />trol project might reduce this cOlltlibution about IBO.OOO tons per <br />year re~ulting in c reduction of the salinity concentration at Imperial <br />D~m about l~ to 17 mg/l. <br /> <br />Inv.::;~".:ig~_tion!.; ::;"i..::.:-1:~Ci in PY 1972 and a feasibility report is scheduled <br />fo;,:: cc:,;:)!,:,..,i.:ion il1 F"I 1975. Ground-'Y!ater observation wells have been <br />drill~j and ~ =c~istivity study completed to determine the fresh water/ <br />brine int~~facc and the geologic formations of the valley near the <br />river. A 9~ffip test well is being drilled and the pump testing will be <br />conducted i~ C=tob~r and November of this year. <br /> <br />Based on data d2v~lop0d at this time, the control plan is to lower the <br />f:r:esh water/brine interface by pumping \-Jells along the Dolores River <br />to prev'.:lnt ~be bri.nL from entering the river. The estimated pump dis- <br />charge o~ 5-8 cfs '''()u~d b0 tr.<,_nsmitted via pipeline to an evaporation <br />and ~~lt st0r;:ge reser"oir on the West Fork of Dry Creek about 20 miles <br />to 1~he foutnC:;l st. <br /> <br />S"!.c~€':"';c~..:.:l-I'ots':'ro S.l:~rJaqs Unit <br /> <br />The G1-:r"vO:ld-Do-::s~::':0 group of springs discharge to the Colorado River <br />at cP?o~itc el-ds of Glen;..:ood Canyon in Colara.do. These springs are <br />estimateu to contribu~e 25,000 acre-feet of water and 500.000 tons of <br />S2.J.t t.:J th02 r.:.vcr annually. If 200,000 tons of salt were removed each <br />Yca~, tte salinity concentration at Imperial Dam would be reduced <br />17 mg/l. <br /> <br />Inv~s'tig:::tion ',"u.~ initiated in April 1972 by locating and identifying <br />1& sc!,)c..:.rilte LprinlJs ,.,:ti.ch have subsequently been measured and analyzed <br />..lonthly. 8e"/c:::....J. c:;.j"ternatives have been considered to treat or dispose <br />of this highly sa:"inC". ,.rater including deep well injection, plugging <br />springs, evaporativ_ ponds, and several methods of treatment. After <br />con~iderins c~e geology involved. the present resort uses of water. <br />and the ::::0t~nti_al loss of .....atc:-... it ......as concluded that some type of <br />desz:.lt:.ng 'vould be the most desirable solution. The problem is compli- <br />c::l.ted b~/ the co:-"lec~ion of many springs, conveyance to a suitable site, <br />and di~p~s~l of thE effluent. <br /> <br />Topog:."<Jphy \:d~ o:.....tained ar.d a resistivity survey was completed in the <br /> <br />-2- <br />