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<br />. <br /> <br />o <br />00 <br />~ <br />o <br /> <br />. <br /> <br />. <br /> <br />HISTORY OF WATER RESOURCE DEVELOPMENT (Continued) <br /> <br />The plan of implementation comprises a number of Federal and non- <br />Federal projects and measures to maintain the flow-weighted average <br />annual salinity in the lower main stem at or below the recommended <br />numeric criteria through 1990, as the Basin States continue to develop <br />their compact-apportioned waters, The principal components of the plan <br />are as follows: <br /> <br />1. Prompt construction and operation of the initial four salinity <br />control units authorized by Title II of P.L. 93-320, the Colorado River <br />Basin Salinity Control Act, <br /> <br />2. Construction of the 12 other units listed in Title II of P.L. <br />93-320 or their equivalent after receipt of favorable planning reports. <br /> <br />3. The placing of effluent limitations, principally under the <br />NPDES permit program provided for in Section 402 of P. L. 92-500 on <br />industrial discharges. <br /> <br />4. The reformulation of previously authorized, but unconstructed, <br />Federal water projects to reduce the salt loading effect, <br /> <br />5. Use of saline water for industrial purposes whenever practical, <br />programs by water users to cope with the river's high salinity, studies <br />of means to minimize salinity in municipal discharges, and studies of <br />future possible salinity control programs. <br /> <br />The report recognizes that many natural and man-made factors affect <br />the river's salinity. Consequently, the actual salinity will vary above <br />and below the recommended numeric criteria. However, under the assump- <br />tions of streamflow equivalent to the long-term average, a "moderate" <br />rate of increase in water depletions and full implementation of needed <br />salinity control measures, the average salinity can be maintained at or <br />below 1972 levels during the study period of the next 15 years, <br /> <br />The Federal regulations provide for temporary increases above the <br />1972 levels if control measures are included in the plan. Should water <br />development projects be completed before control measures are identified <br />or brought on line, temporary increases above the criteria could result <br />and these increases will be in conformance with the regulations. With <br />completion of control projects, those now in the plan or those to be <br />added subsequently, salinity would return to or below the criterial <br />level. <br /> <br />Periodic increases above the cri teria as a result of reservoir <br />conditions or periods of below long-time average annual river flow also <br />will be .in conformance with the regulation. With satisfactory reservoir <br />conditions and when river flows return to the long-time average annual <br />flow or above, concentrations are expected to be at or below the <br />criteria level. <br /> <br />22 <br />