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nn23C) ',,1 'J J... specific-conductance measurements made in Harch. Constituent concentrations probably are diluted during the irrigation season (April through October) by irrigation water diverted from the Uncompahgre RiVer. Constituent concen- trations in the four sets of samples collected from Sweitzer Lake (site 7) generally were smallest in November (table 16), at the end of the irrigation season. '000 12.100 'l'"L NOVEMBER Z "00 '" 7}20 JANUARY Z . MARCH 0 <.000 '^^ ;:: >M . JULY "'" ~ "'w 3."" >->- ~ Z:J w", 3.000 Uw ~ Z~ 0", 2."" ~ U" "'" 9", 2.000 ~ ~O ~ 0- "'~ ~. ~ ~ ~ 0- 1.500 ~ w" > ~ ~ ~ ~ '.000 0 '" ~ '" ~ ~ is .... 0 GARNET CANAL DRAINAGE DITCH S....'EITZERLAKE OUTFLOW DIVERSION , , . , SITE NAME AND NUMBER Figure 13.--Dissolved-solids concentrations for sites at Sweitzer Lake, Sovember 1987 and January, Harch, and July 1988 (no bar indicates no sample collected). Site 5, the diversion from the Garnet Canal into S~eitzer Lake, had the largest concentrations of dissolved solids, major ions, and several trace elements in the samples collected for this reconnaissance investigation. The ~ater sampled at site 5 during November through March is irrigation drainage and shallow ground-water discharge intercepted by the Garnet Canal. The concentration of dissolved solids ~as 12,700 mg/L; sodium was 2,900 mg/L; and sulfate was 7,500 mg/L in late March (table 16), about 1 week before the Gunnison Tunnel diversion was opened. The sample collected in March at site 5 had the maximum concentrations of selenium (320 ~g/L), boron (800 ~g/L), vanadium (14 ~g/L), and uranium (64 ~g/L) for samples collected during this reconnaissance. Water samples collected in November at site 6 had substantially smaller concentrations of dissolved solids (fig. 13), sodium, sulfate (table 16), and selenium (fig. 14) than did the ~ater samples collected at site 5 on the same 43