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<br />:\ <br /> <br />The seeding solution consists (by weight) of approximately 97 percent acetone <br />(C3H60), 2 percent silver iodide (AgI), 0.6 percent ammonium iodide 1:NH4I), and 0.4 <br />percent water (lIP). The AgI is the active ingredient, the NH.I allows the AgI to go <br />into solution with the acetone. These ingredients were purchased by the NCWCD. <br />NCWCD personnel mixed the solution and recharged the ground generators as needed <br />during the winter season. <br /> <br />Operation of the unit is fairly simple. The propane is turned on at the propane <br />tank by a local operator. A second valve on the propane line may be present at the CNG <br />unit, and, if so is also turned on. Once the propane flows through the CNG unit it is <br />ignited in the burn chamber (usually by using a striker). The flowmeter valve is then <br />adjusted so that the required amount of solution is sprayed into the burn chamber and <br />consumed by the flame. The prescribed setting on the flow meter allows the solution to <br />burn at a rate of approximately .12 gallons an hour which in turn means that the silver <br />iodide (AgI) in solution, is burned at a rate of approximately eight (8) grams an hour. <br />The propane is consumed at a rate of one-half gallon an hour. <br /> <br />Winter stonns that move into Colorado are nonnally accompanied by winds <br />blowing from northwesterly through southwesterly directions. The CNG's therefore are <br />located upwind of the northwest, west and southwest edge of the target in order to take <br />advantage of these winds to carry the seeding material up into the stonn clouds over the <br />intended target region. Fifteen different sites are used, with locations in an arc from <br />south of the target through west and then northwest. Due to the terrain of the area, <br />distance from the target ranged from approximately 3 to 20 miles. All fIfteen CNG sites <br />are located at private residences. Figure 1.1 shows the location of each of these sites. <br /> <br />3.2 Office Facilities <br /> <br />For the 1993-94 program NAWC's Salt Lake OffIce was equipped to receive <br />National Weather Service (NWS) infonnation through an Alden satellite system. This <br /> <br />3-4 <br />