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<br /> Ini tial S-day <br /> Station Date D.O. pp!1J D.O. ppro BODS <br />~ CR-2 12/17/73 12.9 12.8 0.1 <br />c:: <br />--1 CR-4 12/17/73 12.8 12.6 0.2 <br />. <br />,- <br /> CR-6 12/17/73 12.7 l2.6 0.1 <br /> <br />These results also represent less than 20* dissolved oxygen depletion and are <br /> <br />inconclusive. However, the results do indicate that oxidizable ~terial placed <br /> <br />in the River during the winter mont.~ will take an inordinate amount of time to <br /> <br />break down. <br /> <br />Chemical analysis of river sediments did not indicate any downstream patterns <br /> <br />(see Table l7). Inspection of the data does demonstrate extremely high concen- <br /> <br />trations of phosphorus, up to 3.6 grams P04/K9 of sediment, and nitrogen, a <br /> <br />maximum of 864 mg/Kg of sediment in the Colorado River substrate. Nitrogen in <br /> <br />tr~ suspended solids settles to the stream bottom and phosphate in the water <br /> <br />absorbs rapidly direct;y onto the substrate or onto suspended matter and settles <br /> <br />to ~~e river bottom in eddies and pools. These nutrients in the sediments are <br /> <br />generallY available to plant life. With the im::Jense concentrations of nutrients <br /> <br />on t.~ substrate and dis~olved C02, ~derate alkalinities and high dissolved <br /> <br />oxygen flowing past, diatoms and filamentons algae rapidly colonize ~~e river <br /> <br />bottom forming the brown l:Idt whic.~ covers the river bottom, both rocks a."'ld <br /> <br />sediments. <br /> <br />Analysis of effluents from wastewater treatment plants and industrial <br /> <br />disc.~rges wit.iUn the study area showed that only three facilities, Rifle, <br /> <br />Grand valley, and American Gilsonite were not violating any of the State <br /> <br />Discharge Standards that were in effect at time of sampling (Table 18). BODS <br /> <br />-13- <br />