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<br />. <br /> <br />considered as too far removed in their connection with precipitation <br />management and too disturbed by other variables for meaningful analysis. <br />The Skywater Programmatic FES discussion about effects on aquatic <br />ecosystems and the more recent Sierra Ecology Project report on the <br />workshop on lake and stream biota [17] are incorporated into this <br />document by reference. <br /> <br />Precipitation increases could significantly and/or adversely affect <br />endangered and threatened species of animals and plants and their <br />habitats. The site-specific investigations required for phase two of <br />the proposed alternatives and for an operational cloud seeding scenario <br />would include studies of likely effects on endangered and threatened <br />species that may occur in the proposed project areas if such species <br />are found. This process will begin with consultation with the Fish and <br />Wildlife Service and State fish and game officials. Installation of <br />instruments during the first phase (data collection/calibration phase) <br />of the project would have no impact on these species because of the <br />selection policy of avoidance of such sites. <br /> <br />d. Impacts on the Human Environment <br /> <br />Increases in precipitat ion usually est imated at between 10 and <br />15 percent per annum are not expected to generate new or incremental <br />population increases above those estimated in existing development <br />scenarios for the Colorado River Basin. The two most commonly per- <br />ceived driving forces for population growth in the Basin are the <br />sunbelt phenomenon and development of coal and oil shale resources. <br />Various studies of future resource requirements in the Basin present <br /> <br />34 <br />