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INTERNAL MEMO <br />TO: Dan Mathews 19 May 2005 <br />FROM: Jim Burnell <br />SUBJ: McClane and Munger Canyon (C-1980-004; C-1981-020) 2004WI' AHR <br />Review <br />The review of the McClane Canyon/Munger Canyon 2004 AHR has been completed. <br />Following is a review as per the predictions made in the PHC. <br />Probable Hydrologic Consequences <br />(1) Initial mine inflow rates will decrease in an area. <br />This prediction seems to be accurate. The implication in the text is that inflows diminish <br />from any particular location through time as pillars slowly dewater. <br />(2) The maximum mine inflow rate will be 77 gpm. <br />This prediction is accurate. The rate was estimated at 16.9 gpm in 2004. <br />(3) Mine discharge will have a small impact on East Salt Creek. <br />This prediction is accurate. Data show that the water from the mine has been of better <br />quality than the water in East Salt Creek. Paired sampling events above and below the <br />mine show that total suspended solids (TSS) and total dissolved solids (TDS) were <br />actually lower downstream of the mine than above in both the 151 quarter sampling and <br />the run-off event on September 21, 2004. Several analytes were present in higher <br />proportion down stream from the mine (specifically sodium, aluminum, sulfate) but by a <br />very small amount. Iron was lower downstream during the storm event, but higher <br />downstream during the is` quarter sampling. Overall there was a negligible effect. <br />Cc: Sandy Brown <br />