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<br /> <br /> <br /> <br />, <br />~ <br />, <br /> <br />- <br /> <br /> <br />Colorado River Basm Salinity Control Program <br /> <br />r , <br />tll <br />{,;"\ <br />, <br />h . <br /> <br />surface waters of the Whue" River. To \'erify Ihis theory. a program was initiated (0 clean, test. <br />and plug (he James. ,\tarland. Meeker. and Scon Wells, A net.....ork of observation ......ells and seep <br />measuremem stations were installed [0 monjwr the effects of (he venficatlon program. <br /> <br />The bores of the James and Scon Wells were cleaned, tested. and successfully plugged. Major <br />difficulties were encountered with the J\larland Well. An adJacem imercept hole was drilled and <br />used 10 plug it by using pressure cememing from the Imercepl hole, This was apparemly successful <br />in stopping the last ~ource of seepage from the dome and eliminating me need for replugging the <br />Meeker WelL <br /> <br />Groundwater levels in ob!lef\'ation wells and flows from saline springs haw decreased significantly <br />from the conditions e,1(isting at the lime of the verification well plugging. ThIs informal ion appears <br />to confirm the hypothesis that the wells aCled as conduits for saline Water. In September 1984. salt <br />loading from the dome had decreased from the prep lugging level of ahout :!6,O()O tons per year to <br />about 7,000 10ns pt:'r year. AI the end of FY85. monitOring of seeps and wells was terminated. <br />Water leveL.. In [he observation wells had stabiilud, and springs and seeps remained dry or filled <br />wjth standing water. mdicalJng the well plugs remained intact A Planning Repon Concluding lhe <br />,\fuker Dome VI/If study was published in July 1985. <br /> <br />Yeritic31ion Sludics-ln 1994, ReclamatIOn executed a cooperatiw agreement with USGS to <br />re-visit the site and confirm whether or not the unil is still preventing salt from entermg the While <br />Ri\er. Water-Resources Investigations Repan 95~27, Trend AnalYSIS of Selected Heuer Qualiry <br />Dara Assof/ated with Salina') -Cowrol Projecrs /fJ rllt' Grand \'alley, in IIII.' wiler Gunnison R/I'er <br />8a5/f1. and ar ,\feeker Dome, \i.'esrern Colorado, found evidence that salimi)' levels in the main <br />river channds dropped significantly 1I1 these project area.., Because of the umque chemislry of the <br />Meeker Dome seepage (sodium chloride), the Meeker Dome evaluatIon was at'lle to positively <br />conclude that the well plugging project continues [0 be very effel.:ll\'e. <br /> <br />Nonpoint Source Control <br /> <br />Managemem of nonpoim ~ources to control sail loadIng from rangelands has oeen investIgated <br />through Slate and Federal cooperative dfons in Ulah, Colorado. and Wyoming The Ulah ~tudy <br />was compleled in 1991. In Colorado, results of Ihe study were released in ]992. The Wyoming <br />inventory was completed in 1993. In conducting Ihese studies. dala fr0m all watershed~ draining <br />into Ihe Colorado River Basin were compiled 10 eSllmate contrihutlons of sail from nonpOlllt <br />sources and (0 determine the pvtemial for treatment. The watersheds with the highest prioril)' for <br />treatment have been Idenllfied in each State. <br /> <br />55 <br />