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<br />l)!)2346 <br /> <br />Sampling Sites and Schedule of Sample Collection <br /> <br />Water-quality samples for inorganic analysis were collected from the <br />Gunnison and Uncompahgre Rivers, Sweitzer Lake, and inflow to and outflow from <br />Sweitzer Lake (table 9). Water sampling was done in four surveys (table 10) <br />to define seasonal change in water chemistry and in trace-element concen- <br />trations. Samples were collected in November (2 to 3 weeks after the irri- <br />gation season ended); in January (during a period of cold weather that had <br />stable, low-flow conditions), and in late March (one week prior to start of <br />the irrigation season). Samples also were collected in July during the irri- <br />gation season. <br /> <br />Table 9.--Sampling sites and types of samples collected <br /> <br />[Number in parentheses by site name is U.S. Geological Survey gaging <br />station number, if applicable; X, sampled; --, not sampled] <br /> <br />Site Water Bottom Biota <br />number Site name Inor- Pesti- sediment Inor- Pesti- <br />(figs. 2 ganic cides Inor- Pes ti- ganic cides <br />and 8) ganic cides <br />2 Gunnison River below X X X <br /> Gunnison Tunnel <br /> (09128000) <br />3 Gunnison River at X X X X <br /> De lta (09144250) <br />4 Uncompahgre River at X X X <br /> Colona (09147500) <br />5 Garnet Canal diversion X X <br /> at Sweitzer Lake <br />6 Drainage ditch at X <br /> Sweitzer Lake <br />7 Sweitzer Lake X X X X X X <br />8 Outflow from Sweitzer X <br /> Lake <br />9 Uncompahgre River at X X X X X <br /> Del ta (09149500) <br />10 Gunnison River at X X <br /> Escalante State <br /> Wi Idlife Area <br />11 Gunnison River X X X X <br /> upstream from <br /> Escalante Creek <br />12 Happy Canyon Creek X X <br /> near mouth <br />13 Spring Creek near X X <br /> mouth <br />14 Dry Creek near mouth X X <br /> <br />31 <br />