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<br />about 1.5 hours to return to the operations base, refuel, reload <br />the generators and return to the target area. Multiple flights are <br />anticipated for a given stom period. Crews will be briefed during <br />re-fueling and adjustments to their tracks will be made if meteoro- <br />logical conditions warrant them. Check lists and observation fonns <br />will be filled out by the pilots, recording their aircraft pJsitions, <br />seeding rnaterial dispensed, cloud conditions, estimated wind/tur- <br />bulence, and ice nculei counts. <br /> <br />E. Any expected effects upon the environment resulting <br />from the propJsed project and the methods of deter- <br />mining and evaluatinq those effects. <br /> <br />Based upon the results of similar winter projects that <br />have operated in Colorado, Utah, and California, and crc's experience <br />in North America, Africa, and the 11editerranean, this project does not <br />iIWOlve any high degree of risk of substantial harm to the land, <br />people, safety, property, health, or ecology of the Alpine systems. <br />(Bureau of Reclallation Ecology Studies Report, dated March 9, 1976). <br /> <br />Research projects have deronstrated that cloud seeding, <br />using the propJsed procedures, can increase the seasonal sllONpack <br />10-25% (CSU and Bureau of Reclarration). These same research studies <br />show that individual stonns, with optimum cloud temperature conditions, <br />can show increases of 100-200% over periods of 6-18 hours. <br /> <br />The above anticipated changes in precipitation anounts <br />are still within the nomal variation of natural precipitation events, <br />Since the =rent snowpack conditions are well below normal, the <br />ll1creases from the propJsed 3 m::mths of operations are anticipated to <br />ranain within the normal range of winter snowpack. <br /> <br />. <br /> <br />As a prudent measure, crc willllDnitor the water content <br />repJrted by at lease three snCNl' survey regions operated <br />by the Soil Conservation Service which are in the target <br />area. rf the current average of three snCNl' courses, with <br />15 years of previous data, exceed 125% of nomal, crc will <br />suspend cloud seeding operations. <br /> <br />. <br /> <br />If at any time during the project period, weather fore- <br />casts should indicate extremely heavy snCNl'fall or other <br />severe weather in terms of precipitation and/or winds, <br />crc will suspend operations. <br />