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Section 780.21(b) Continued. <br /> <br />Entrance of spoil leachate to aquifers will be negligible from the <br />temporary overburden stockpile, since it ie not located over any <br />ground water recharge areas. This can be demonstrated by compari- <br />son of Map 1, Kerr Mine Area Mine Plan with Map 15, Kerr Mine Area <br />Ground Water Hydrology. The ground water hydrology map shows <br />aquifer recharge areas and the mine plan map shows the location of <br />the temporary stockpile. In any event, the stockpile will be very <br />well drained and will have all runoff water from upstream and <br />surrounding areas diverted around it. Additionally, backfilled <br />spoil will be compacted by scraper and bulldozer movement, thereby <br />decreasing infiltration rates. Additional discussion on drainage <br />control at the temporary stockpile has been presented in this <br />Section under the sub-heading "Surface Water Quality Protection". <br />Any potential impact with respect to toxic, acid- or alkalinity- <br />producing material can be dismissed on the basis that no such <br />• materials exist in sufficient quantities to produce any adverse <br />effects. A thorough discussion on the chemistry of the overburden <br />is presented under Section 779.14. <br />It should also be noted that, despite some unavoidable increase in <br />TDS concentrations, or change in ion balance, there should be no <br />adverse impacts because, 1) there are no private water wells in <br />the aquifer to be affected within the adjacent area; 2) dilution of <br />resulting TDS concentrations occurs with increasing distance from <br />the point of recharge; 3) permeability of the affected aquifer is <br />low (see description of aquifer under Section 779.15); and 4) the <br />water within the aquifer is of relatively low quality in its base- <br />line condition, as shown in Table 6, Kerr Mine Area Ground Water <br />Quality Data. <br />780-105 <br /> <br />