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<br />calculate dissolved-solids concentrations at the rema1n1ng 13 sites. Data <br />~ from the upper part of the Gunnison River basin (sites 1-6, 8, 11, 14, 16, <br />en 19-21) were used for one regression analysis (fig. 11) to compute <br />~ dissolved-solids concentrations when the specific conductance values were <br />~ 600 ~S/cm (microsiemens per centimeter at 250 Celsius) or less. Data from the <br />lower part (sites 18, 23, 24, 27, 32-38) were used for a second regression <br />analysis (fig. 12) when specific conductance values were greater than <br />600 ~S/cm. Values of discharge, specific conductance, dissolved-solids <br />concentration, and salt load for each site are presented in table 3. The <br />Gunnison subregion was divided into six subbasins: East and Taylor Rivers, <br />Tomichi Creek, Upper Gunnison River, North Fork Gunnison River, Uncompahgre <br />River, and Lower Gunnison River (fig. 10). <br /> <br />East and Taylor Rivers <br /> <br />This subbasin includes the drainage area upstream from the confluence 'of <br />the East and Taylor Rivers (fig. 10). Igneous and metamorphic rocks underlie <br />most of the Taylor River drainage, but the Leadville Limestone underlies the <br />drainage locally. The East River drainage contains large areas of Mancos <br />Shale as well as smaller areas of the Maroon Formation and other related <br />Pennsylvanian and Permian rocks and the Mesaverde Group of Late Cretaceous <br />age. <br /> <br />400 <br /> <br /> <br />Dissolved-loUd. concentretion=O.6654 x <br />Specific conductance+3.48 <br /> <br />'" <br />w <br />I- <br />:J <br />'" <br />w <br />.. <br />'" <br />::! <br />~ 300 <br />to <br />:J <br />~ <br />:E <br />;;:: <br />z' <br />o <br />~ 200 <br />'" <br />I- <br />Z <br />w <br />U <br />Z <br />o <br />u <br />'" <br />o <br />:J <br />o <br />'" <br />" <br />w <br />> <br />~ <br />o <br />'" <br />'" <br />i5 <br /> <br />. <br /> <br />100 <br /> <br />. Value of diasolved-solide concentration <br />and .pacific conducumce from <br />chemical enalyaia <br /> <br />o <br />o <br /> <br />100 200 300 400 500 600 <br />SPECIFIC CONDUCTANCE, IN MICRDMHOS PEA CENTIMETER AT 260 CELSIUS <br /> <br />Figure 11.--Specific conductance versus dissolved-solids <br />concentration, Gunnison subregion, for specific conductance <br />values of 600 microsiemens per centimeter at 250 Celsius, <br />or less. <br /> <br />34 <br />