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<br />. <br /> <br />a consideration of the most beneficial project effects. The objective is to reduce drainage <br />return flows from land with low irrigation efficiency. <br />D.6. Painted Rock Reservoir Land Acquisition and Operation Schedule Modification <br />The Corps of Engineers has studied a number of release schedules for Painted <br />Rock Dam and has identified six viable pions for the discharge of Ooodwater stored in <br />the reservoir. The Corps' preliminarily recommended plan would schedule releases varying <br />from 250 ft3/s to 22.500 ft3/s depending on the reservoir stage. <br />P"hlic Lilli' 93-32U. in Section 101. (j). authorizes the acquisition of additional land <br />nl Painted Rock Reservoir that would be required for temporary storage capacity due <br />to operation schedule modifications. The law does not, however, authorize the expenditure <br />of funds for this purpose until it has been determined by a Federal cOllrt that the Corps <br />of lnginecrs lacks legal authority to use such lands for this purpose: as yet, such <br />detcrmination has not been made. <br />D.7. Fish and Wildlife Mitigation <br />Construction of project facilities for the Desalting Complex Unit will result in <br />the loss of approximately 1,000 acres of land. including that for rights~)f-way. and about <br />400 acrcs of fish habitat. Mitigation will be provided through the acquisition of around <br />900 acres of land to be assigned to the Arizona Game and Fish Department for designation <br />anu liSt' as a wilLllife and recreation managem~nt area. Fish re~lring facilities will be <br />constructed to provide for the annual stocking of 200 to 300 surface acres of lakes. ponds, <br />rivers. and canals in the Yuma area. The Hunter's Hole pond complex. adjacent to the <br />limitrophe section of the Colorado River. will also be maintained through construction <br />of an outlet control structure and a shallow well. <br /> <br />. <br /> <br />E. Relation to Other Colorado River Basin Salinity Control Projects <br />The quality of water in the Colorado River is degraded by the addition of dissolved <br />mineral salts (salinity!. municipal wastes, industrial wastes, agricultural wastes (pesticides <br />and fertilizers). and mine drainage. Various other parameters which also affect water quality <br />are dissolved oxygen concentration. temperature, pH. heavy metals. toxic materials. <br />nutrie"ts, bacteria. radioactivity, mercury. and sediment. Salinity. among all of these wattT <br />quality factors. is tile most serious ont' within the river systelTl. <br /> <br />. <br /> <br />8 <br />