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~ c C\? o --:! CHAPTER V STAGE TWO PLAN OF DEVELOPMENT '-, '......... The primary environmental effect of the Stage Two plan of develop- ment would be a reduction of salt loading to the Colorado system, which would help maintain water quality for downstream water users as well as provide more efficient irrigation systems in the Grand Valley. A long- term reduction in wetlands supported by canal and lateral seepage would also occur. In addition, a major reduction in trees along canals and laterals would result. The Fish and Wildlife Service will prepare a Fish and wildlife Service Coordination Act Report and a Biological Opinion on Stage Two. Concerns expressed to date include loss of habitat and hazards to mule deer as a result of canal lining. Losses of seepage-supported wetlands would occur, edge vegetation along ditches would be reduced, and lands would be cleared for construction material sites, cross-drainage facili- ties, and structure replacement. The salinity control plans being con- sidered for Stage Two are acceptable to the Service provided that a plan can be approved to mitigate losses. These measures have not been imple- mented because wildlife funding for the Grand Valley Unit has not been authorized by Congress nor has legislation been enacted to mitigate for wildlife losses. Stage Two development would not cause additional Colo- rado River depletions which could affect endangered fish species. Also, critical habitat for terrestrial threatened or endangered species is not expected. Stage Two would, therefore, be in compliance with the Endan- gered Species Act. Cultural resources are currently being inventoried in the unit area. Li terature reviews have been completed and these indicate that known sites on the National Register of Historic Places would not be affected. 56