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<br />A 9uar:t~r1y . Re'pert on lI\eo~ '. ..
<br />Colorado River Water Quality
<br />Improvement Program .
<br />
<br />Irrigated Crop Lands
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<br />October 1982
<br />
<br />
<br />: Irrigation Water
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<br />.;T;,~',,_\...,\,/\,<- .4-6 Ft. Soil
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<br />SOURCE
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<br />Beneficial Use of Big Sandy River
<br />'.-/;:Jar
<br />
<br />I
<br />
<br />. Sa d River Unit. located in
<br />For the B,g n Y beneficial use is the
<br />southwestem Wyoming, I .ect Th
<br />r .ty contro pro) . e
<br />key to a viable saini h of Rock Springs,
<br />. I ted 40 miles nort
<br />Unit. oca f th Colorado River Water
<br />is a component 0 e ram. The Big
<br />Quality Improvement ~~"(he Green River.
<br />Sandy River. tributary tons of sail to the
<br />contnbutes over 167,(X)O ounting for 15
<br />d R"ver system. ace
<br />Colora 0 I. LI at Impenal Dam.
<br />milligrams per hter (mgl
<br />California. . tor the Big Sandy
<br />Feasibility level Plann,: bY the Coiorado
<br />River Unit was authorlt I Act of 1974.
<br />. B s.n Salinity Contro
<br />River a I . 9BO on ways to
<br />. t. 5 began In 1
<br />Investlga Ion seeps and springs
<br />ed salt pickup from
<br />r uce. f the Big Sandy River
<br />along a 26-mlle reach, 0
<br />west of Eden. Wyomln~ early in the
<br />A planning team. tor I.m.nary
<br />.. I pedprel I
<br />investIgatIon, deve 0 h salinity problem
<br />alternative solulions to t eSage Murphy and
<br />Reclamation's contractor, bl
<br />. AI develOped a pro em
<br />AssOCiates (SM, ificatlOn report (PIQ)
<br />identificatIOn and quan~ydrOIOgy of the
<br />which details the geD- .ns the salt loading
<br />project area and explal. ns indicate that
<br />mechanisms. Investlgatl~ flOW of some 33
<br />saline seeps have adt~:S) The salinity of the
<br />cubic feet per seeon mQ;L to 6,OCO mg/L.
<br />seeps varres from 3,QCXJ
<br />
<br />OF SALT
<br />
<br />LOADING
<br />
<br />Indications are that salt is picked up by
<br />irr~aUof\ water contactifig the shale 01 the
<br />Green River Formation beneath the surface
<br />and eventually seeping into the river.
<br />The investigation identified various ways to
<br />intercept the springs and seeps and
<br />transport, treat, and use or dispose of the
<br />saline water. Altematives were investigated
<br />by the planning team and the contractor.
<br />These alternatives were evaluated by the
<br />planning team and new alternatives were
<br />formulated. Since Wyoming law requires that
<br />water be used beneficially and not be
<br />exported from the State, altematives
<br />requiring evaporation or transfXJrtation
<br />across the State line were excluded from
<br />further considerations. Wyoming actively
<br />sought industrial use of the saline water and
<br />several industries expressed interest.
<br />One industrial-use alternative preferred by
<br />Wyoming was modified and selected as the
<br />proposed plan of development. Under this
<br />plan, saline water would be removed by
<br />collection wells in the spring and seep area of
<br />the Big Sandy River and pumped through a
<br />pipeline to a proposed Chevron phosphate
<br />fertilizer plant near Rock Springs. A potential
<br />second pipeline to an industrial area near
<br />Green River, Wyoming, is also part of the
<br />proposed plan. but depends on future
<br />industriai growth. To supplement the plan.
<br />Wyoming is studying a dam and reservoir
<br />proposal to provide a fi rm water yield if need
<br />Is generated by industrial growth.
<br />
<br />....30-40 Fl. Sand Layer
<br />
<br />GREEN RIVER FORMATION
<br />
<br />The State of Wyoming and Chevron
<br />CherniC3\ Corp. have signed a contract
<br />which would provide industrial water ~o
<br />Chevron from Fontenelle Reservoir. At the
<br />State's option, up to half of the water could be
<br />delivered from the Big Sandy River Unit. The
<br />saline water is compatible with Chevron's
<br />fertilizer processing.
<br />Reclamation and Wyoming have signed a
<br />Memorandum of Agreement outlining the
<br />responsibilities of each during the remainder
<br />of the investigation. In the agreement,
<br />Wyoming IS providing up to $3(X),CXXJ to
<br />assist in accelerating completion of the
<br />studies. Wyoming will study a dam and
<br />reservoir on the Big Sandy River and will
<br />provide environmental data to be used to
<br />develop the draft environmental impact
<br />statement. Reclamation will prepare and
<br />process the environmental statement and
<br />provide study information and final plans and
<br />specifications on the collector wells,
<br />pumping plant. and pipelines. Wyoming and
<br />Reclamation will prepare a joint report to be
<br />presented to the Wyoming Legislature In
<br />January 1983. This report will be used by the
<br />legislature to determine whether or not to
<br />continue studies and/or fund construction of
<br />the project.
<br />Reclamation is currently conducting a
<br />verification program to determine if the
<br />collector well concept will develop the
<br />quantity of water needed to supply industry
<br />and, more important, actually remove saline
<br />
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