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<br />trr)r~ common in the [);)tsero-New Castle area thiin downstream. Large eddies, <br /> <br />~ <br />CZ <br />"'-l <br />.... <br /> <br />bacrNaters, and pools are common along the banks where the river bed curves <br /> <br />bend. Hot springs in the river bend are common from [);)tsero to ~ew Castle. <br /> <br />In winter months, steanl coming off the water marks exact locations of t.~ese <br /> <br />springs. <br /> <br />Changes in the substrate, brought about by sedimentation, alter the river <br /> <br />bottom in some areas. Sediment, in this report, is defined as a dense muck, <br /> <br />brown on the water substrate interface and turning grey or black a few aUlli~ters <br /> <br />deep into the substrate. From Dotsero to ~~e state line, the depth of the sediment <br /> <br />increases from a few centimeters along ~;'e eddies and river banks to appro.dmately <br /> <br />one meter g;ong tha pocl areas below De Beque. In addition, rocks in the main <br /> <br />cha:mel are gradually covered with a thin brown "Aufwuc.hs" composed or- sand <br /> <br />grains, diat~7o$, and blue-green algae as summer progresses into winter. <br /> <br />WASTE SOURCES <br /> <br />Industry, at present, bas little impact on the Colorado River witr~n the <br /> <br />study area. Four industrial sites are located on the zain stem. In Gle<<Nooa <br /> <br />Canyon, the Shoshone Power plant diverts water for hydro-electric use, periodically <br /> <br />reducing the river flow for a distance of approximately ~~ee miles below the <br /> <br />diversion to a trickle. All diverted water is returned to tr~ River. Union <br /> <br />Carbide operates a nondiscr~rging uranium and vanadium mill immediately ~est of <br /> <br />Rifle. At Cameo, another power plan:: diverts water from the R.iver, e....e water <br /> <br />being returr.ed to an irrigation canal. American Gilsonite Company .~s a plant <br /> <br />west of :ruita disc.~rging 100,000 gallons pe~ day of eff1uent into the River. <br /> <br />-7- <br />