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:;-'1 0::1' .-4 ,.... . ' Consistent with the regulation, the recommended flow-weighted average annual numeric sal inity criteria for three locations in the lower main stem of the Colorado River System are: Sal inity in mg/l Below Hoover Dam Below Parker Dam Imper i a I Dam 723 747 879 The plan of implementation comprises a number of federal and non- federal projects and measures to maintain the flow-weighted average annual sal inity in the lower main stem at or below the recommended numeric criteria through 1990, as the Basin States continue to develop their compact-apportioned waters. The principal components of the plan are as follows: 1. Prompt construction and operation of the initial four salinity control units ~includes Grand Valley Unit) authorized by Title II of PL 93-320, the Colorado River Basin Salinity Control Act. 2. Construction of the 12 other units listed in Title II of PL 92-320 or their equivalent after receipt of favorable planning reports. 3. The placing of effluent I imitations, principally under the NPDES permit program provided for in Section 402 of PL 92-500 on industrial discharges. 4. The reformulation of previously authorized, but uncon-' structed, federal water projects to reduce the salt load i ng effec t. 5. Use of sal ine water for industrial purposes whenever practical, programs by water users to cope with the river's high salinity, studies of means to minimize salinity in municipal discharges, and studies of future possible sal inity control programs. Because many natural and man-made factors affect the river's sal inity, the actual sal inity will vary above and below recommended numeric criteria. However, under assumptions of streamflow equivalent to the long-term average, a reasonable rate of increase in water depletions and full implementation of needed sal inity control measures, the average salinity can be maintained at or below 1972 levels during the study period of the next 15 years. 6