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<br />(.oJ <br />r-v <br />U1 <br />;\,) <br /> <br />Accomplishments in the Upper Colorado Reqion <br /> <br />Point Source Division <br /> <br />P:"rado:: Valley Unit <br /> <br />It is estimated that Par~dox Valley contributes about 200.000 tons of <br />salt p~r ye~r ~o the Dolores River in southwestern Colorado. A con- <br />trol project might reduce 'Chis contlibution about IBO.OOO tons per <br />year re:::ulting in c. reduction of the salinity concentration at Imperial <br />D3m about l~ to 17 m3/1. <br /> <br />Inv.::c'.:ig.....tions :-~<.~:;:V~6 in PY 1972 and n feasibility report is scheduled <br />fa:.: CCl,1::J]..c,tio;1 in PY 1975. Ground-",,'ater observation wells have been <br />drillcj and ~ =C~i5tivity study completed to determine the fresh water/ <br />b~ine intQ=face and the geologic formations of the valley near the <br />river. A 9JffiP test well is being drilled and the pump testing will be <br />conc5.uctec5. ir-. ()::::tob~l- and November of this year. <br /> <br />Bascu on data d~v~lop~d at this time, the control plan is to lower the <br />f:r:.-csr.. water/brine interface by pumping \'Jells along the Dolores River <br />to prev~nt ~be bri!1Co. from entering the river. The estimated pump dis- <br />cha~gc of 5-8 cfs wou~d b~ t~~nsmitted via pipeline to an evaporation <br />and u:.lt st0r;:':J~ resep'oir on the \'lest Fork of Dry Creek about 20 miles <br />to 1:he ~OUt.hC3:3t:. <br /> <br />r!.L_e~..Jc':)..:.:1-!Jots0ro Spl-iilOS Uni t <br /> <br />'IhC! Gl:r.'_...ood-;;ots~:;:o group of springs discharge to the colorado River <br />at cP?o:.:itc el'ds of GlemJood Canyon in Colorado. These springs are <br />estimated to contribu~e 25,000 acre-feet of water and 500.000 tons of <br />52.lt t.::> th0 r.:.vcr ilnnually. If 200,000 tons of salt were removed each <br />Y~Ct::', tl:~ 5ulinity concentration at Imperial Dam would be reduced <br />17 mg/I, <br /> <br />Inv.:'.!stig::tion .....;).5 initiated in April 1972 by locating and identifying <br />1& sC!J.:r~t~ ~p;cin'Js '.}~i.ch have subsequently been measured and analyzed <br />Donthly. Seve::;-J. Cl.:i-:ernatives have been considered to treat or dispose <br />of this highly sa:inG vJilter including deep well injection, plugging <br />5prings, evaporc.tiv_ ponds. and several methods of treatment. After <br />con~iderins c~e geology involved, the present resort uses of water, <br />and the ~ote~t~.al 11.)5s of .,....ate,:. it was concluded that some type of <br />c.es<::..lt:.ng would be the most desirable solution. The problem is compli- <br />c~ted b~ the co~lec~ion of many springs, conveyance to a suitable site, <br />and di~p~~<::..l of the effluent. <br /> <br />Topog:-nphy \;J.~ o~....tained ar.d a resistivity survey \.:as completed in the <br /> <br />-2- <br />