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. . . ~ o w::.. I-' . . . . . . . . These opinions follow from analysis summarized below. General Applicability to Colorado River Waters. Under PL 92- 500 the objective of eliminating the discharge of pollutants is a "national goal extending to navigable waters. ,,21 The mainstream of the Colorado is navigable as a legal matter, 22 as are its tributaries which affect its navigable capacity.23 Also, in-stream standards for ambient receiving water ("water quality standards") existed for the interstate and intra- state surface waters within the CRB before PL 92-500, as a result of the Water Quality Act of 1965.24 Those standards, except as revised, 25 continue to cover the Colorado River system under PL 92-500.' No direct legal precedent is known at this time which would exclude stret- ches of surface water on federal reserved lands and Indian reservations from existing and planned water quality standards. Applicability to State and Federal Lands and Facilities. The Act encompasses state and federal lands through two provisions: Area wide and basin planning. Public lands are not expressly exempted from areas subject to area wide waste treatment planning un- 26 der PL 92 -500, and thus both federally owned and state owned lands appear to quality for inclusion in such plans. Public lands are also implicitly subject to Level B basin planning, under the Water Resources 27 Planning Act of 1965, which is perpetuated by PL 92-500. Effluent limitations and discharge permits. To control and phase out the discharge of pollutants, PL 92-500 requires that all point-source 5