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<br />3. Solute Leaching <br />In an attempt to quantify the amount of solute leaching from <br />backfilled mine pits, the applicant performed a leaching study on <br />overburden material collected from the Eckman Park Mine. One of the <br />most important results of a leaching study such as this is to <br />estimate an anticipated "worst case" value for total dissolved <br />solids concentration of leachate percolating through the reclaimed <br />spoils pits. An anticipated "worst case" TDS value for sp~.ls <br />leachate should be included in this section. Also, the raw data <br />compiled from the leaching experiment should be included in the <br />permit application. <br />RSSPONSB: <br />Page 2.05-171a has been revised to include a predicted level of <br />TDS concentration in the spoil leachate. The results of the <br />leaching eaperiment were sumuarised from an unpublished manuscript <br />Q~ <br />entitled "Bstimation of Salt Load from Spoil Material Based on Drill <br />Samples", by H.R. Gardner, Soil Scientist, OSDA Agricultural <br />Research Service. The rav data has not been made publically <br />available. <br />4. Solute Transport <br />8 ~~~ <br />The applicant has quantitatively discussed the mechanism of <br />increased dissolved solids transport from the backfilled mine pits to the <br />undisturbed overburden aquifer system. However, a quantitative <br />interpretation of effects has not been presented. A numeric projection <br />of anticipated impacts of spoils water discharge on the ambient <br />-16- <br />J <br />