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08/09/99 MON 17:02 FAR 801 524 5021 USFWS-Utah Field Off ce RO-COKANUT Additional remediation activities during late 1997 and early 1998 incl ded excavation of channels in Stewart Lake to facilitate complete draining of the lake, placement of a new culvert next to the existing outlet channel, installation of a flow control structure at the new inlet channel to decrease sediment loading and to control the level at which river flows enter t lake, and finally, irrigation drains J1 through J4 were diverted around Stewart Lake by extending the drains to the Green River. Results from monitoring activities in 1997 and 1998 will be used to a sess the effectiveness of these and future cleanup activities. Methods All whole-body fish sampled in Stewart Lake were collected using tr el nets, hoop nets, Fyke nets or seines. The fish were weighed and measured and grouped by ize into composite samples of 3 to 5 individuals. They were then placed in plastic bags, labeled nd frozen on dry ice while in the field. Once at the office, they were then stored in a freezer until s ipped to the lab. Whole- body fish collected on the Green River were collected by electro- sho king. These fish were also weighed and measured, grouped by size into composite samples of 3 0 5 individuals and frozen in the field on dry ice and stored in a freezer until shipped to the lab. C mposite, small fish samples collected in the backwaters of the river were collected with a seine, s rted by species, placed in Whirl Paks®, labeled and frozen in the field using dry ice. They wer then stored in a freezer until shipped to the lab. Endangered fish were scanned for a pit tag if a scanner was available If the scanner did not get a reading from a fish, it was assumed the fish was a new capture and a it tag was placed in the fish. If a scanner was not available, the fish was examined for a pit tag sc which would at least indicate a recaptured fish. Under most circumstances muscle plugs ere also collected from endangered fish as they were captured. Using a sterile 4 mm biopsy unch, a plug was taken from a position approximately 2.5 cm ventrally from the anterior of the do al fin of the fish. The plug was placed in a sterile vile, labeled and placed on wet ice in the field They were then stored in a freezer until shipped to Columbia Environmental Research Center w ere they were analyzed using neutron activation (Waddell and May, 1995). To speed healing and o prevent infection, Neosporin® was placed in the hole left by the plug removal. Bird eggs were taken opportunistically from nests as they were foun( floated to determine incubation stage of the eggs (Westerkov, 1950). selected for analysis. Each egg was weighed and measured prior to c embryo was placed in a chemically cleaned jar, checked for obvious 1974), labeled and frozen on dry ice in the field. They were then sto to the lab. ,Data from the U.S. Fish and Wildlife Service suggest that the C Lake at the new inlet channel at a river flow of 7,250 cubic feet per All eggs in the nest were One egg was then randomly pening. Upon opening, the leformities, aged (Caldwell, ed in a freezer until shipped River enters Stewart 9003