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• Previous mining activities in the proposed permit area have <br />created changes in the existing surface water quality. Mining <br />practices such as r®oving and stockpiling topsoil, clearing <br />vegetation, road construction, and vehicular travel have increased <br />runoff rates and have provided the potential for increased erosion <br />and increased total suspended solids (TSS) concentrations of <br />streams. The detention of water is sedimentation ponds or other <br />structures and pumping water out of pits have increased the total <br />dissolved solids (TDS) concentrations of streams. Salt <br />concentrations in sedimentation ponds or other water detention <br />structures will increase as a result of evaporation. <br />A portion of the final highwall at Mine Ao. 3 has been left <br />• open, forming a detention basin at the base of the dipalope. hater <br />which percolates through regraded spoil accumulates in the detention <br />basin. The detention basin acts as a sedimentation pond in treating <br />runoff water for suspended constituents. The concentration of <br />dissolved constituents in the detention basin is relatively high, <br />due to the leaching of soluble elements in the spoil material during <br />percolation, and evaporation during detention. These dissolved <br />solids eventually enter ground water systems, through recharge at <br />the highwall. Analyses of overburden and topsoil from the proposed <br />permit area has demonstrated that no tonic, acid- or alkalinity- <br />producing materials ezist within the proposed permit area. The <br />chemical characteristics of the overburden are described under Rule <br /> <br />2.05 - 138 <br />