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VDetermination of Probable Hydrologic Consequences <br />As previously described in this section and detailed in Section 2.04.7, <br />Hydrology Description, both surface and groundwater hydrologic systems <br />may potentially be impacted by planned mining, processing, and related <br />operations. These impacts are not expected to be significant, will not <br />effect either surface or groundwater users, and are expected to be <br />localized and temporary in nature. Operational mitigation measures and <br />reclamation of disturbance areas will result in effective restoration of <br />surface and groundwater conditions similar to those existing prior to <br />mining and related disturbance. <br />Within the Southfield mine area, the only groundwater resources of <br />significance relative to historic water use are limited to surficial <br />colluvial /alluvial terrace deposits, perched groundwater reservoirs <br />occurring predominately in flooded, abandoned underground mine workings <br />in the upper portion of the stratigraphic sequence, and the Trinidad <br />Sandstone. <br />Within both mine and loadout areas colluvial /alluvial terrace deposits <br />are exposed at the natural topographic surface and intersected by numerous <br />existing ephemeral drainages. As a result, the areal extent of continuous <br />terrace deposits which could serve as effective groundwater aquifers is <br />limited and the deposits drain at their exposed margins to intersecting <br />ephemeral drainages. With the exception of more extensive alluvial <br />deposits within the floodplain of the Arkansas River, there is no known <br />use, and mining operations are not expected to significantly impact <br />groundwater resources from terrace deposits in the mine, loadout or <br />adjacent areas. <br />Loadout operations are confined to surface disturbance. With minimal <br />hydrologic connection between surficial deposits and underlying strata due <br />to low permeability cross - bedded and interbedded shales and siltstone, any <br />groundwater effects resulting from loadout operations will be limited to <br />. surficial strata exposed by the adjacent Oak Creek drainage. <br />2.05.6 -39 <br />