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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 /> 4/1/82 <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 <br /> 1987 and 1992 were higher than one standard deviation. For conductivity, all but one of the <br /> outliers occurred after 1987. This is a significant difference. It appears that something has <br /> happened to the water quality since 1987 at station #20 on Coal Creek to cause a higher <br /> concentration of Total Dissolved Solids. This effect was not reported explicitly in the <br /> Annual Hydrology 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 <br /> since 1978. There is virtually no variation in the TSS concentrations, all of which are very <br /> low, since 1984. <br /> 6. Water Ouality on the Crystal River. The USGS data cover several stations on the <br /> Crystal River, and some historical data for Coal Creek. The most telling data are <br /> conductivity analyses for the Station on the Crystal above Avalanche Creek. (Avalanche <br /> Creek discharges to the Crystal downstream of the Coal Creek discharge.) <br />