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<br /> <br /> month in which the sample was obtained. If <br />' several samples have been ob tained in a particu- <br /> lar month, then these give an indication of the <br />' F <br /> variablity in concentration in that month. or <br />' comparison, water quality standards were in- <br /> cluded in Appendix B. <br /> <br /> Of the twelve selected parameters, pH, dissolved <br />' oxygen, ammonia, total iron, and copper, fail to <br /> meet at least one of the standards at least one <br />' time. Seasonal trends are apparent for TDS and <br /> total iron, The other parameters do not exhibit <br /> seasonal variation. Total dissolved solids are <br />' least concentrated in the North Fork during the <br /> period between about May and Jury, probably <br />' because high-TDS ground water is diluted by snow <br />' runoff. Total iron is most concentrated during <br /> this period of time, <br />1 Comparison of pre-mining water quality data with <br />' operational water quality data shows no signifi- <br />cant change in water quality within the North <br />' Fork. Relatively high values of ammonia, TSS <br />and total iron were observed in June, 1983. <br />Concentrations of these parameters were nearly <br />' the same at the upstream station indicating that <br />the mine is not the source of the high values. <br />' -23- <br />