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<br />Table l.--Summary of selected total trace-element concentrations for <br /> Gunnison River at Delta, Uncompahgre River at Ridgway, <br /> and Uncompahgre River at De1ta--Continued <br />Constituent Number of samples Median Maximum Minimum <br /> UNCOMPAHGRE RIVER AT DELTA <br />Arsenic 101 10 105 0 <br />Boron 69 170 540 0 <br />Cadmium 131 .3 11.1 0 <br />Chromium 10 0 10 0 <br />Copper 171 8 120 0 <br />Lead 177 9 160 0 <br />Mercury 7 .5 .5 .5 <br />Molybdenum 23 0 20 0 <br />Nickel 7 50 100 0 <br />Selenium 103 15 52 0 <br />Zinc 205 20 410 0 <br /> <br />Table 2.--Summary of selected trace-element concentrations for streamflow <br />gaging station 09152500, Gunnison River near Grand Junction <br /> <br />[Sample collection and analyses by the U.S. Geological Survey; concentrations <br />are for dissolved constituents unless noted; concentrations are in micro- <br />grams per liter; <, less than; ND, concentration reported as not detected; <br />__, not determined. Data-collection period is 1975-88, except for boron, <br />which is 1951-79.] <br /> <br />Constituent Number of samples Median Maximum Minimum <br />Arsenic 55 1 7 <1 <br />Arsenic, total 28 2 5 <1 <br />Boron 173 140 350 0 <br />Cadmium 54 <1 10 0 and ND <br />Copper 54 2 23 <2 and ND <br />Lead 54 3 71 o and ND <br />Mercury 53 <.5 <.1 <br />Mercury, total 25 <.5 <.1 <br />Selenium 54 7 25 <1 <br />Selenium, total 27 10 21 4 <br />Vanadium 25 <6 15 <1 <br />Zinc 55 10 82 3 and ND <br /> <br />22 <br />