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<br />. <br /> <br />. <br /> <br />l''' <br />::i", Status of Salinity Control Activities <br /> <br />~ Bureau of Reclamation <br /> <br />Salinity control projects In which both the Bureau of <br />Reclamation and U.S. Department of Agriculture are involved <br />and are in the implementation phase are described under this <br />heading. <br /> <br />Progress during the reporting period on the salinity <br />projects authorized by Title II of P.L. 93-320 and P.L. 98- <br />569, and other measures that reduce salinity in the lower <br />mainstem of the Colorado River, are presented in the <br />paragraphs that follow. A complete description of the <br />projects can be found in the "1987 Review - Water Quality <br />Standards for Salinity - Colorado River System," August 1987. <br />Location of the proposed salinity control measures are shown <br />on Figure 2. <br /> <br />. Par adox Valley Uni t (Reclamation) - Although prelimi- <br />nary testing indicated an acceptable injection zone exists, <br />concerns emerged regarding the compatibility of the injected <br />brines and the injection zone formation fluids and the <br />potential for salt precipitation in the injection zone. <br />Precipitation could render the well useless. Reclamation, <br />with the help of a consultant, is investigating the use of <br />inhibitors and other methods to reduce the potential for <br />precipitation. A two year test period is scheduled to begin <br />in early 1990. Approval to begIn injection of brine was <br />granted by EPA in October 1989. <br /> <br />Grand Valle Unit Reclamation-De artment of A riculture) <br />- Lin ng 0 the West En Government H gh 1ne Cana was <br />completed in 1988, removing 5,600 tons per year of salt from <br />the Colorado River. Construction of the associated laterals <br />is well under way. About 17 miles of piped laterals were <br />completed in 1989. <br /> <br />preconstruction activities with the Grand Valley <br />Irrigation Company, Palisade Irrigation District, and Mesa <br />County Irrigation District continued in 1989. These <br />activities included design data collection, negotiations for <br />operation and maintenance contracts, public involvement, and <br />rights-of-way. <br /> <br />For the portion of the Grand Valley Salinity Control <br />Unit being constructed by Reclamation, mitigation of wetland <br />losses is required. In partial fulfillment of the mitigation <br />program for the Grand Valley Salinity Control Unit, <br /> <br />-6- <br />