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<br />INTRODUCTION <br /> <br />. <br /> <br />. <br /> <br />~ <br />0:.:> <br />0> <br />OJ <br /> <br />To aid in the preparation of ~he 303 Water QU2lity ~a~ageaent Plan, the Water <br /> <br />Quality Control Division undertook a survey ot the Colorado River tram Dotsero, <br /> <br />Colorado to the Utah border, a river seqment requiring additional data. The <br /> <br />Division's Mobile Laboratory was utilized for the field work. This report covers <br /> <br />a sampling period extending from October, 1973 through September, 1974. The <br /> <br />main emphasis during the sampling period ~as the ga~~ering at chemical data <br /> <br />although some biological studies were also conducted. Additional sampling was <br /> <br />scheduled far the S~r ot 1975 but manpower limitations caused this to be <br /> <br />delayed indefinitely. <br /> <br />Si.J.'\!MARY <br /> <br />At any g~'len st~t~o~ G~ the Colorado River during ~~e study, the stream <br /> <br />flow was always 1280 c.t.s. (cubic teet per second) or greater. The flows all <br /> <br />exceeded the once in ten year I low flows. The magnitude of flow was s:Jc.~ that <br /> <br />point source discharges attributable to wastewater treat.ment plants were <br /> <br />i1r.L~diately diluted past detection levels. Under these conditions, any <br /> <br />degradation of water ~Jality would probably be due to the culmulative affects <br /> <br />of several entities and not any single plant. <br /> <br />The water quality of the Colorado River reflected the geology of the land <br /> <br />as the River flowed towards the border. In the Glenwood Canyon area, the low <br /> <br />conductivities and alkalinities are due to the outcroppings of slow eroding <br /> <br />granite rock fo~tions through h~~ch the River flows. In the aptly named <br /> <br />1 Once in ten year fJow "'" the lowes:; flow ci:serv:able for =evc:: co::sec;:ti,;.,:> <br />cays once i~ te:: ye3rs. <br /> <br />-1- <br />