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Mid-Continent Report; Nov. 15, 1993 <br /> Steve Renner/Harry Posey <br /> Page 6 <br /> Normalized against flow, Conductivity and TDS outliers occurred at the following times: <br /> Cond TDS <br /> 2/8/78 <br /> 12/11/78 <br /> 1/17/80 <br /> 4/l/82 <br /> 1/4/83 <br /> 1/4/84 <br /> 10/2/85 <br /> 4/21/86 <br /> 11/11/87 <br /> 10/13/88 10/13/88 <br /> 7/6/89 <br /> 10/24/89 10/24/89 <br /> 9/19/90 9/19/90 <br /> 10/8/91 10/8/91 <br /> Of the TDS values collected between 1978 and 1986, 13% were higher than one standard <br /> deviation above the mean relative to flow, whereas 42% of the values collected between 1987 <br /> and 1992 were higher than one standard deviation. For conductivity, all but one of the outliers <br /> occurred after 1987. This is a significant difference. It appears that something has happened <br /> to the water quality since 1987 at station #20 on Coal Creek to cause a higher concentration of <br /> Total Dissolved Solids. This effect was not reported explicitly in the Annual Hydrology <br /> Reports, although it was indeed mentioned. <br /> 5c. TSS Outliers versus Flow. All of the TSS outliers relative to flow occurred prior to <br /> 1984. As indicated above, water quality as measured in suspended solids, has improved since <br /> 1978. There is virtually no variation in the TSS concentrations, all of which are very low, since <br /> 1984. <br /> 6. Water Quality on the Crystal River. The USGS data cover several stations on the Crystal <br /> River, and some historical data for Coal Creek. The most telling data are conductivity analyses <br /> for the Station on the Crystal above Avalanche Creek. (Avalanche Creek discharges to the <br /> Crystal downstream of the Coal Creek discharge.) <br />