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<br />z-:s~ <br />2.4.2.1 Probabie Hydrologic Consequences <br />Impacts to both the surface and groundwater systems in the area of the mine will <br />be minimal. The design of surface water control systems is in accordance with <br />established regulations that ensure that these structures are adequate to retain or <br />safely pass the design events. The surface water flows are either directed around the <br />mine area or are passed through the sediment pond and routed to the existing surface <br />water system. No impact to surface water flows is anticipated. <br />Groundwater encountered during mining will also have a minimal Impact on the <br />hydrologic regime of the area. Since there are no adjudicated groundwater rights <br />within more than two miles of the proposed permit area, there is little chance that <br />• existing water rights will be effected. As can be seen on Figure 4.2-3, most of the area <br />to the south and west of the mine will not exhibit groundwater above the elevation of <br />the coal seam. <br />The mine is situated near the location that the Cameo seam subcrops the <br />alluvial valley floor of East Salt Creek. A piezometer installed in drill hole 7-9-12 at the <br />Cameo seam, downdip of this subcrop, has been dry since it was installed. Drill hole 7- <br />15-3 was also dry. Drill holes in Section 22, east of the graben indicate that this area <br />may be saturated. <br />Evidence submitted in previous annual hydrologic reports has detailed the <br />existence of a perched aquifer in the graben. The operator is uncertain if the drill holes <br />in Section 22 indicate another perched aquifer that is being recharged by the stream in <br />the Munger Canyon drainage, or if these holes indicate that the coal to the east of the <br />• <br />I M`Clane Volume l 12199 <br />