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<br />. <br /> <br />. <br /> <br />INTRODUCTION <br /> <br />(\J <br /><.:l <br />m <br />()C <br /> <br />To aid in the preparation of ~he 303 Water QU21ity Mar.agement Plan, the Water <br /> <br />Quality Control Division undertook a survey of the Colorado River from Dotsero, <br /> <br />Colorado to the Utah border, a river segment 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, 197] t.~ough September, 1974. The <br /> <br />main emphasis during the sampling period ~as the ga~~ering of chemical data <br /> <br />although some biological studies were also conducted. Additional sampling was <br /> <br />scheduled for the Summer of 1975 but manpower limitations caused this to be <br /> <br />delayee indefinitely. <br /> <br />SU!ofMARY <br /> <br />At any g~'len st3tio~ C~ the Colorado River during the study, the stream <br /> <br />flow was always 1280 c.f.s. (cubic feet per second) or greater. The flows all <br /> <br />exceeded the once in ten year 1 low flows. The magnitude of flow was sc2c.~ that <br /> <br />point source discharges attributable to wastewater trea~~ent plants were <br /> <br />i~~diately diluted past detection levels. Under these conditions, any <br /> <br />degradation of water quality would probably be due to tne culmulative affects <br /> <br />of several entities and not any single plant. <br /> <br />The water quality of the Colorado River reflected t.~ geology of t~e land <br /> <br />as the River flowed towards the border. In the Glen~ Canyon area, the low <br /> <br />conductivities and alkalinities are due to the outcroppings of slow eroding <br /> <br />granite rock for::ations through whic."1 the River flows. In t.~e aptly named <br /> <br />1 Once in ten year fJ.ow = the lowe~:: flow cbserv~ble f::r ::evcn c:;::sect:ti...2 <br />days once i~ te:: years. <br /> <br />-1- <br />