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Sampling for water quality constituents has continued since the 1974-1975 data collection <br />period. The USGS has collected data at Taylor Creek, Wilson Creek and Goodspring Creek <br />for a host of water quality parameters as a part of the continuing EMRIA Program. Colowyo <br />has also collected data for Taylor Creek and Goodspring Creek for the period 1978 to <br />present. These data continue to reflect the high variability by month of specific conductance, <br />total dissolved solids, total suspended solids and the other constituents of concern. Table 19 <br />is a comparison of USGS and Colowyo data. The raw data from which these calculations <br />were derived are included in Exhibit 7A. The data in Table 19 are revealing in that the USGS <br />effort has been much more intensive than the Colowyo effort, but the results are quite similar. <br />Comparisons of mean values indicate that little difference exists between each program for <br />similar stations. These mean values show no significant differences except for the total <br />suspended solids data at Taylor Creek. Colovvyo's data shows much lower mean values than <br />does the USGS data. This is due primarily to the greater number of samples taken by the <br />USGS which included a greater number of stotTn events and continuous measurements over <br />these storm hydrographs. The USGS data, in this case, is more appropriate as an absolute <br />indicator of suspended solids values for Taylor Creek. However, even though the absolute <br />values are significantly different, the ratios between the mean and the standard deviation are <br />similarly large, reflecting the extreme natural variability of these constituents. <br /> <br /> <br />2.04.7-70 <br />