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• ~ water quality gradually approaches that of the typical overburden, which is still very high in TDS. <br />In the Probable Hydrologic Consequences Item 5) Potential impacts of replaced spoil on <br />groundwater quality, this oxidation and its impacts are discussed in extensive detail. Overall, the <br />impacts to the groundwater quality and the waters downstream are not significant, although they <br />occur for a lengthy period of time. <br />WFC has developed plans for sampling overburden during mining to identify the quantity and- <br />quality of deleterious material (see Section 2.04.6, Geology). <br />Naturally occurring waters in the surrounding undisturbed ground water system exhibit a high <br />degree of mineralization (see Section 2.04.7, Hydrology Description). Well yields are tow. Most <br />recharge to the local undisturbed ground water system is from both the Lower Second Park and <br />the West Lateral irrigation ditches and associated laterals via seepage. This localized, artificial <br />source of ground water recharge will augment slower, natural recharge contributions during the <br />spoil resaturation process. As spoil resaturation progresses, the quality of ground water in the spoil <br />will likely approach the water quality of surrounding geologic units. <br />Mixing and the overall high degree of neutralization potential of the spoil material will minimize <br />• changes in ground water quality. See following discussion on Probable Hydrologic Consequences. <br />Based on physical and chemical analyses performed on core samples taken from the lithologic <br />units to be affected by mining (see Section 2.04.6, Geology Description), a classification system <br />has been developed for these units with regard to handling during operation and reclamation <br />activities. A handling plan for those material classes identified by sampling as being potentially <br />deleterious to revegetation or the ground water quality in either mining area has been developed <br />and is presented in Section 2.05.4(2)(d), Topsoil (Redistribution). <br />It is not anticipated that W FC will transfer ownership and use of any wells completed within New <br />Horizon 2 mining areas. Bore holes, shafts, wells, and auger holes will be cased and/or sealed to <br />prevent possible ground water degradation from mixing of waters of different qualitywithin the bore <br />holes and acid or toxic surface runoff entering the bore holes. A specific plan for sealing of bore <br />holes, exploration holes, auger holes, wells, and shafts is presented in Section 2.05.6(3)(b)(v), <br />Hydrologic Reclamation Plan. <br />• <br />REVISED MARCH 2006 2.05.6(3)-5 <br />