The state, through the department of ecology and the attorney general, shall represent its interest before water resource regulation management, development, and use agencies of the United States, including among others, the federal power commission, environmental protection agency, corps of engineers, department of the interior, department of agriculture and the atomic energy commission, before interstate agencies and the courts with regard to activities or uses of shorelines of the state and the program of this chapter. Where federal or interstate agency plans, activities, or procedures conflict with state policies, all reasonable steps available shall be taken by the state to preserve the integrity of its policies.