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<br />The data available include synoptic surface and <br />upper air charts (also individual rawin and pibal observations), <br />satellite maps, local weather observations including cloud conditions <br />and precipitation occurrence and arrounts. <br /> <br />'!hese data will be sufficient to prepare forecasts <br />upon which seeding decisions will be made. <br /> <br />3. Types of Aircraft <br /> <br />A twin engine Piper Aztec N888Y will be used as the <br />seeding and observation aircraft. This aircraft has an altitude cap- <br />ability of 25,000 feet MSL. It has CXllIplete IFR navigation equipnent <br />and has de-icing equipnent suitable for icing rates anticipated for the <br />flight missions. <br /> <br />All flights will be conducted with qualified pilot <br />and co-pilot. Special arrangements have been made with the FM regional <br />center in IDngnont for assistance in clearing the seeding aircraft for <br />the intended flight patterns. <br /> <br />prirnaJ:y aircraft operations will be conducted from <br />Jefferson County Airport with Stapleton Airport as an alternative base. <br />Re-staging can also be conducted from Boulder and/or Ft. Collins Airports. <br /> <br />M:mitoring and evaluation flights will also be conducted <br />to measure cloud temperature, cloud liquid water content and ice nuclei <br />concentrations. Selected flights will be directed at rronitoring the ice <br />nuclei concentrations rroving into the western parts of Colorado as a <br />result of cloud seeding operations being conducted in the State of Utah. <br /> <br />4. Description of seeding devices, materials and seeding <br />rates, etc. <br /> <br />'IWelve, manually operated, ground based silver iodide <br />(AgI) generators will be located in the western portions of the project <br />area. '!hese AgI generators are of the basic type used in projects through- <br />out Colorado, California, and Utah. '!hey are basically kno"m as "Skyfire" <br />generators with recent technical adaptations. These generators have proven <br />to be reliable and safe for this type of operation. Nuclei efficiencies in <br />tenns of nuclei generated per gram of solution burned have been calibrated <br />by the CSU Cloud Simulation Laboratory. '!he AgI -acetone solutions burned <br />will contain 2.5% AgI. The solution will burn in a propane flarre at a rate <br />of .25 gallons/hour, which is (;!qUivalent to approximately 18 grams AgI per <br />hour and will produce about 1016 active nuclei per gram at -20QC. <br />