"Reasonable alternative" means an action that could feasibly attain or approximate a proposal's objectives, but at a lower environmental cost or decreased level of environmental degradation. Reasonable alternatives may be those over which an agency with jurisdiction has authority to control impacts, either directly, or indirectly through requirement of mitigation measures. (See WAC 197-11-440(5) and 197-11-660.) Also see the definition of "scope" for the three types of alternatives to be analyzed in EISs (WAC 197-11-792).