Laserfiche WebLink
drainage. <br />• The pH values from all of the Trapper wells is within the <br />range~of natural values for these aquifers. The pH values from <br />water for the four backfill wells is within the range observed in <br />the other aquifers. <br />Radium-226 concentrations were all low in 1990 at the Trapper <br />Mine except for one value. The three other values from well GF11 <br />Here below 5 pCi/1 and indicate the high value may be in error. <br />The average flows of the surface water sites of the Trapper <br />Mine were depressed in 1990 over average flows observed in 1987. <br />The overall precipitation did increase in 1990 but the lower <br />precipitation amount during 1988 and 1989 is responsible for the <br />lower average flows. No failures or monitoring site problems were <br />encountered during 1990. <br />• Low flows were responsible for poor flow versus sediment <br />relationships and rising TDS values during 1990. Other chemical <br />constituents analyzed from samples collected from the surface water <br />sites showed little change during 1990. The monitoring data <br />indicates that the Trapper Mine control structures prevented any <br />impacts on the surface water systems downgradient of the mine in <br />1990. <br />• <br />6-4 <br />