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<br />SEP-29-97 MON 03:37 PM TRC NORTH AMERICAN WX <br /> <br />FAX NO. 801 972 3813 <br /> <br />p, 10 <br /> <br />same sign (increase.~ or decreases) and roughly <br />the same magnitude as the primary 'target <br />area' effects. <br /> <br />There is currently little evidence available to <br />support the 'robbing Peter to pay Paul' <br />hypothe.~is that seeding to increase rain in one <br />area will deprive some other area of its normal <br />rainfall. However, the data base is inadequate <br />to rule out the possibility that such a <br />combination might occur." <br /> <br />The objective, as stated ill Question 1, is to beneficially increase <br />precipitation in the target area. If snowpack accumulation reaches a <br />level where additional precipitation would be considered to be no <br />longer beneficial, then seeding operations would be either suspended or <br />terminated. The proposed suspension criteria are when the perc~ntage <br />of normal snowpack reaches the' following values on the dates given: <br /> <br />c:J 175 pertent on or about January 1 <br />c:J 160 pertent on or about February 1 <br />o ISO percent on or about March 1 <br />o 140 percent on or about April 1 <br />o 13S percent on or about May 1 <br /> <br />Normal snowpack will be calculated by averaging the actual Soil <br />Conservation Service snowpack reai:lings for water content from <br />representative snow observations sites in or near the target area. <br /> <br />The normal snowpllck will be the average water content of the <br />snowpack for the past 15 years of record for the selected snowcourse S c--- <br />from January 1 to April 30. For December, percent of average shall be <br />calculated by the Soil Conservation Service Snow Survey unit. The <br />following Snotel snowcourse sites ares proposed to represent the target <br />area: <br /> <br />Will~fJ Creek Pass 9540' <br />Grary.y 8600' <br />Stillwater Creek 8720' <br /> <br />r_- <br /> <br />The applicant will work with the staff at Rocky Mountain National <br />Park to establish a monitoring/study program. The purpose of the <br />monitoring/study program will be to 1) establish a .baseline. level of <br />silver present in the snowpacl( and 2) measure levels of silver in the <br />snowpacl( immediately after seeding has occured in order to determine <br /> <br />f:\dng\pennit.\Wpd <br /> <br />4 <br />