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<br />SfNf BY <br />8- 4-98 :12~41PM : CANONIE F7VGLEPi04D-' <br />• <br />EVALUATfON OF WATER ANALYSIS DATA <br />HENQERSON MILL WATER QUALITY MONITORING <br />7.0 INTRODUCTION <br />Chemical data from water quality samples taken from 7985 to 7992 in the Henderson <br />Mill area ware evaluated statistically to determine possible Impacts of the mill <br />operation an Williams Fork River. Based on the comparison of upgradient samples <br />(HW-'!?with downgradient samples iHW-4), the results of the evaluation indicate that <br />there has been no statistically significant impact on tfie Williams Fork River iiom the <br />operations at Henderson Mill. <br />Metals evaluated were cadmium, copper, iron, lead, manganese and zinc. Tha <br />evaluation included: <br />1. Calculating averages and standard deviations by month for each paranneter at <br />each monitoring point to provide a ranpa of expected analytical values <br />2. identifying date points that appear to be arronecu6 <br />3. Compering analytical data to Colorado instream standards for 34day rhverage <br />discharge without a documented 10-year, 24hour event <br />4. Identifying if any statistically significant impact from the Henderson Mill site <br />on Williams Fork River is indicated <br />6. Identifying measurements that have good correlations to allow future red'uctlon <br />of measurements <br />In addition, data were evaluated geochemically to provide recommendations about <br />future sampling. Tablas with transposed water quality data are included in <br />Appendix A. <br />;# 6/19 <br />ww.:ws,.,wnow,,.~.. Ny. ~.+.rn <br />