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i Alluvium <br />Alluvial sediments aze monitored in the Foidel Creek valley upstream and downstream <br />of Mine 1 and in the Fish Creek valley upstream and downstream of Mine 2. Four <br />wells completed in the Foidel Creek alluvium are monitored. Three wells completed in <br />the Fish Creek alluvium aze monitored. <br />Water Levels <br />The plots of the historic water levels in the four Foidel Creek alluvial wells are <br />presented on Figures 8 and 10. The plots of the historic water levels in the Fish Creek <br />wells aze presented on Figures 11 through 13. The water levels in the adjacent streams <br />show the typical seasonal pattern of relatively rapid increase and decline due to spring <br />runoff. In addition they show the general decline in water levels due to the relatively <br />low runoff since 1987. <br />While the seasonal variation in water levels in the Foidel Creek alluvium is readily <br />• apparent, no impact from mining is evident. The average water level in the 001-5-5, <br />AV-1 and 008-AV-2 well, adjusted for differences in spring runoff, has not changed <br />since monitoring began in 1979. The alluvial well immediately downgradient from <br />Pond A (Well 009-5-10) shows a slight water level decline compared with previous <br />yeas due to much lower discharge volumes. The water level data for the Fish Creek <br />alluvial wells do not show any impact from the reclaimed Mine 2 area. <br />Water Oualitv <br />The water quality data are summarized in Tables 12 through 17 for the Foidel Creek <br />alluvial wells and in Tables 18 through 23 for the Fish Creek alluvial wells. The <br />historic field conductivities for the Foidel Creek wells aze plotted on Figure 14, and for <br />the Fish Creek wells on Figure 15. Seasonal variation in conductivity is apparent in <br />the wells. This is probably due to the flushing effect of relatively low dissolved solids <br />surface water which recharges the alluvial aquifers during spring runoff. <br />• There was a small increase in the average salt content of the Foidel Creek alluvial <br />groundwater starting in the 1987 water year and continuing through the 1991 water <br />4 - <br />