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VII. Alluvial Valley Floors - Rules 2.06.8 and 4.24 In the original Findings Document, the Division determined that the Oak Creek Valley north of the permit area was an alluvial valley floor. The findings made in regard to Oak Creek Valley remain valid. It was determined that the other two drainages in the permit area (South Oak Creek and Lewis Gulch) were not alluvial valley floors. There are no changes to this section. The application is in compliance with the requirements of this section. VIII. Probable Hydrologic Consequences of Mining and Cumulative Hydrologic m~-~-~~°xs---irr~ s-rcz-x7 rr~ ~mrxrrn,. The original Findings Document includes extensive information regarding the geology and hydrology of the general area of the Twin Pines No. 2 Mine. This information remains valid for the proposed operation during the permit renewal term. In addition to the Twin Pines No. 2 Mine, current active coal mining in the Cumulative Hydrologic Impact study area is limited to the Southfield Mine (previously named the Dorchester No. 1 Mine), located approximately 5 miles southeast of the Twin Pines operation. The Newlin Creek Mine, located adjacent to Southfield, was reclaimed during 1989. The G.E.C. Strip Mine in the same area is inactive, with its permit revoked and bond forfeited. Reclamation of the G.E.C. property is scheduled to begin soon under Division supervision. Probable Hydrologic Consequences of Mining at the Twin Pines No. 2 Mine The operator has provided information on the Probable Hydrologic Consequences of the mine on pages 94 and 95 of the permit application. Several potential impacts were anticipated by the original Probable Hydrologic Consequences document for the Twin Pines No. 2 operation; however, none were considered to be serious enough to damage the hydrologic balance of the area. Additional potential impacts, however, are introduced by pumping of mine water to the surface, which began during the previous permit term. -8-