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<br />Valley contributed an a~erage of
<br />580,000 tons of salt anmlally to the
<br />Colorado River, Most of the salt is
<br />leached from the solI ana under-
<br />lying marine shale by water
<br />delivery system losses add deep
<br />percolation from overirclgation in
<br />agricultural areas, The tlltal USDA
<br />and Reclamation efforts In the
<br />Grand Valley area are expected to
<br />l'\:) reduce the salt load by a~out
<br />CJ1 324,000 tons annually,
<br />
<br />CO Paradox Valley in so~hwestern
<br />o Colorado is a collapsed s4Jt anticline
<br />underlain by a salt dome,~ The dome
<br />adds about 205,000 tons <if salt
<br />annually to the Dolores River from
<br />ground water which origlPates in
<br />the valley, The plan is de$igned to
<br />prevent 180,000 tons of salt annually
<br />from entering the Coioraq;o River
<br />system by pumping the sli1ine
<br />ground water (brine of '
<br />260,000 mg/L TDS) from 4hallow
<br />collection wells along the "olores
<br />River, thus preventing it fItom
<br />sutfacing in the riverbed, .
<br />
<br />Deep-well injection wa$ selected
<br />as a test method to dispos~ of the
<br />brine because it is technicahy sound,
<br />and environmentally and el:onomi-
<br />cally attractive, A test injecltion
<br />well has been drilled to a d~pth of
<br />16,000 feet. Construction of surface
<br />collection system and treat*,ent
<br />faclllties is nearing completion,
<br />Actual injection of brine inti> the test
<br />well is expected in late 1989,
<br />
<br />For the Las Vegas Wash;Unit, a
<br />3,5-mlle pipeline (PIttman Jtrpass)
<br />constructed to detour fresh water
<br />around saline soils is compl~te and,
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<br />in operation, The expected salt load
<br />reduction is 3,800 tons annually.
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<br />Other Activities Under the
<br />Colorado River Water Quality
<br />Improvement Program (CRWQIP)
<br />have been or are under study and
<br />are categorized by the type of
<br />control method being studied for
<br />each unit.
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<br />lITigation source salinity control
<br />activities within RecJamation would
<br />reduce salt loading by improving
<br />irrigation delivery systems that
<br />currentiy leach salt from marine
<br />shales and other saline sources, In
<br />addition to construction activities in
<br />Grand Valley and Dolores Project
<br />areas (formerly McElmo Creek
<br />Unit), planning continues in the
<br />Lower Gunnison Basin Unit in
<br />Colorado and the Uinta Basin Unit
<br />in Utah,
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<br />Point source salinity control
<br />activities would remove salt from
<br />localized areas such as mineral
<br />springs, abandoned oil wells, and
<br />geysers, In addition to Paradox
<br />Valley and Las Vegas Wash,
<br />Glenwood-Dotsero Springs and
<br />Meeker Dome Units in Colorado, as
<br />well as La Verkln Springs Unit in
<br />Utah, are point sources,
<br />
<br />During verification studies, three
<br />wells in the Meeker Dome area were
<br />successfully plugged, reducing salt
<br />loading by 19,000 tons annually,
<br />Studies have been concluded on
<br />La Verkin Springs Unit. Costs of
<br />salinity control programs at this site
<br />were determined to be beyond an
<br />acceptable cost-effectiveness range.
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