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<br />1773 <br /> <br />quality that occurred as the result of water uses, land uses, tributary inflows, point- and non-point source discharges, <br /> <br />'ld natural, climatic, and geological conditions are discussed in this report <br /> <br />An extensive streamflow and water-quality monitoring network was established in April 1990. Water-quality <br /> <br />data collected at 19 main-stem, 31 tributary, and 7 transmountain diversion sites were used to describe the spatial <br /> <br />and temporal variations in water-quality in the Arkansas River Basin between April 1990 and March 1993. Two <br /> <br />mine-drainage sites, Leadville Mine Drainage Tunnel (LMDT) and California Gulch, were added to the network in <br /> <br />1991 (plate 1). Streamflow and water-quality data collected at Arkansas River near Coolidge, Kansas were also used <br /> <br />in the repol!; these data were used to describe water-quality conditions at the downstream end of the stUdy area. The <br /> <br />~ <br />0- <br />c...<:f'J <br /> <br />data coUected as part of this study are available in the U. S. Geological Survey Open-File Report 95-464 "Water- <br /> <br />quality data for the Arkansas River Basin, Southeastern Colorado, I 990-93" (Dash and Ortiz, 1996). The report pre- <br /> <br />sents instantaneous streamflow and water-quality data for all of the sampled sites as weU as data collected as part of <br /> <br />the quality-assurance program. A description of the sampling procedures, quality-assurance sampling protocols, and <br /> <br />~alytiCal techniques utilized in the study can be found in ~e report Sample collection activities continued for three <br />years and included on-site measurements of streamflow, dissolved oxygen, pH, and specific conductance at all sites. <br /> <br />Water samples were analyzed for dissolved solids, trace elements, nutrients, radiochemical constituents, pesticides, <br /> <br />suspended sediment, and bacteria. The analytical groupings associated with each site and the site nomenclature that <br /> <br />wiU be l.lSed in this repol! can be found in table 1. Because of the diverse physiography, geology, land use and water <br /> <br />use in the basin, not all the sites were sampled for the same analytical groupings. The major changes in physiogra- <br /> <br />phy, geology, land use and water use generally occur between Cation City and Pueblo. Therefore, for the purpose of <br /> <br />this repol!, the Arkansas River Basin was divided into an upper and lower basin. The upper basin drains approxi- <br /> <br />mately 4,700 mi2 upstream from Pueblo Reservoir. The lower basin drains almoSl20,700 mi2 downstream from <br /> <br />Pueblo Reservoir to the Colorado-Kansas state line. A de1ailed list of the specific target analytes and the water-qual- <br /> <br />ity data collected at each site is presented in Dash and Ottiz (1996). <br /> <br />_r.'::T!?'~':<:~'~"'~:' .:1~~ ~~~~~:;=~ <br />. _.... '!"-_ "',' ,..-:' '9:..:...,.~~:....1.~")__ ~-.;.1__... <br />,..~:~ :'..~:,.'=-'..~~.-l'.,~-:..~,...~i::...~---- ~ <br />:'''/~-:::''o1.~.i 0.$ ~'~:.i:.:,)t. ~w <br />~. ~..:.".a< ~... ~vision <br />subie~~':.:OR RE\.EASE <br />nc. t>10T QU 'c \ by Director I <br />"'" .. Apoi'OVO . <br />r~r.r;lIng . \ 'co\ Survey <br />U.S. GGo.ogl <br /> <br />. <br /> <br />3 <br />