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<br />. <br /> <br />. <br /> <br />has been placed there in past winter cloud seeding seasons in order to <br /> <br />elevate seeding material above any trapping inversions and place it in <br /> <br />wind flow more favorable to transport toward the mountains. SF6 tracer <br /> <br /> <br />experiments from this elevated site may show how valuable it is and <br /> <br /> <br />point the way toward siting more generators at such sites. <br /> <br />The sequential bag samplers will be placed at either of two sets of <br /> <br /> <br />locations. Initially the samplers will be located at up to 15 sites <br /> <br /> <br />along Utah State Highway 160 running nor1th and south from Beaver. This <br /> <br /> <br />highway is in a valley location about 7 km to the west of the base of <br /> <br /> <br />the Tushar Mtns. SF 6 released from the Adamsville (valley) site will be <br /> <br /> <br />sampled here. Following this initial phase of the work approximately <br /> <br /> <br />ten samplers will be relocated to high elevation sites on the western <br /> <br /> <br />slopes of the Tushar Mtns. SF6 released from both the Adamsville <br /> <br /> <br />(valley) and Jack Henry Knoll (high elevation) sites will be sampled <br /> <br /> <br />here. The bag samples from the high l~levation sites will be collected <br /> <br /> <br />by helicopter. Although the SF6 release and sampling may occur in any <br /> <br /> <br />weather conditions, the helicopter operations must be conducted in safe <br /> <br /> <br />flying weather. If a STORM is in progress, safety may thus dictate con- <br /> <br /> <br />ducting the SF6 studies toward the end of the STORM. <br /> <br /> <br />The SF6 samples will be analyzed in Beaver using a portable gas <br /> <br />chromatograph and electron capture detec:tor. Part of each sample will <br /> <br /> <br />be injected into a stream of ultra-pure nitrogen. This serves as a <br /> <br /> <br />carrier gas for the sample and as an ionization medium for the detector. <br /> <br /> <br />The carrier gas is used to transport the sample into the chromatograph <br /> <br /> <br />column. Here the sample is separated into its individual components. <br /> <br /> <br />They are then eluted from the column and passed through the detector to <br /> <br />measure their relative concentrations ;and electron affinity. The <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />-29- <br />