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Section 780.21 (b) Continued. <br />• and Toy (1976), the infiltration rates of reclaimed land are lower <br />than the same land in the premined condition. A detailed dis- <br />cussion of reclamation and revegetation as related to hydrology has <br />been presented in this Section under the heading "Surface Water <br />Quality Protection". As a further means of minimizing water flow <br />through spoils, no sedimentation ponds will be constructed on top <br />of mined areas or spoil. <br />In the second case, entrance of spoil leachate to aquifers will be <br />negligible, since no excess spoil stockpiles will be constructed <br />over any ground water recharge areas. This can be demonstrated by <br />comparison of the Energy Mines No. 1 and 2 Mine Plan (Map 1) with <br />the Energy Mines No. 1 and 2 Overburden Aquifer Piezometric Surface <br />(Map 11) and by comparison of the Eckman Park Mine Plan (Map 2) <br />with the Eckman Park Overburden Aquifer Piezometric Surface (Map <br />12). The piezometric surface maps show aquifer recharge areas and <br />the mine plan maps show locations of excess spoil stockpiles. In <br />any event, all stockpiles will be very well drained and will have <br />all runoff water from upstream and surrounding areas diverted <br />around them. Additionally, not only will impoundments not be <br />placed on top of excess spoil, but the spoil will be retopsoiled <br />and revegetated, which will have the effect of decreasing infil- <br />tration of water. Additional discussion on excess spoil drainage <br />has been presented in this Section under the heading "Surface Water <br />Quality Protection". Any potential impact with respect to toxic, <br />acid- or alkalinity-producing material can be dismissed on the <br />basis that no such materials exist in sufficient quantities to <br />produce any adverse effects. A thorough discussion on the chemistry <br />of the overburden is presented under Section 779.14 (b)(1)(iv). <br />As a mitigating factor, it should be noted that despite some un- <br />avoidable increase in TDS concentrations, or change in ion balance, <br />there should be no adverse impacts due to the facts that, 1) there <br />• are no private water wells in the aquifer to be affected within the <br />780-167 <br />