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-14- A. Pursuant to Rule 2.06.8(5)(a)(i), the Division finds that the proposed mining operations will not interrupt, discontinue, or preclude farming on alluvial valley floors (Rule 2.06.8(5)). 6. Pursuant to Rule 2.06.8{5)(a)(ii), the Division finds that the proposed surface coal mining operation will not materially damage the quantity and quality of water in surface and ground water systems that supply those alluvial valley floors or portions of alluvial valley floors. C. Pursuant to Rule 4.24.2(1), the Division finds that the proposed surface coal mining operations have been designed to preserve the essential hydrologic functions of alluvial valley floors. VIII. Probable Hvdrologic Conseouences of Mini Because of the close proximity of other active mines and extensive previous mining within the general area, as shown on the attached Figures 1 and 2, the probable hydrologic consequences of the Twin Pines No. 2 Mine and the cumulative hydrologic impact study are discussed concurrently within this section. The document first discusses the Existing Hydrologic Environment of the general area, the Canon City Coal Field. Next is a discussion of the Probable Hydrologic Consequences of the Twin Pines No. 2 f4ine. Then the Cumulative Hydrologic Impact Study {CRIB) assesses the probable cumulative hydrologic impacts of all anticipated coal mining operations upon the general area of the Canon City Coal Field. Included in this assessment are all those proposed coal mines for which complete permit applications nave been submitted to the Division. This study has been prepared using information and analyses contained in the Twin Pines No. 2 Mine permit application, information and analyses contained in other permit applications for mines located in the general area, assistance by the State Engineer and other available information, including site visitation by Division staff members. Existing Hydrologic Environment The general area of the Canon City Coal Field has been extensively mined. Because most of the mining took place early in this century, little, if any, baseline water quality and quantity information exists to characterize the area before mining. However, the mines seeking permits through Colorado's permanent progr~n have collected information describing the hydrologic regime as it currently exists. Anticipated coo] mining operations in the general area as shown on attached Figure 1, include: Mine File No. Operator Twin Pines No. 2 C-058-83 Twin Pines Coal Company, Inc. Dorchester No. 1 C-014-81 Dorchester Coal Company Newlin Creek C-045-81 Harrison-Peltron Joint Venture G.E.C. Strip C-037-81 G.E.C. Minerals