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• -li- • VII. alluvial Valley Floors - Rules 2.06.8 and -.24 (con't) The sediment pond is designed to retain runoff for a period of 24 to 36 hours. after allowing the sediment to settle out all water will be discharged from the pond. At no time will there be more than 2 acre-feet of water stored in the pond. The operation will have no adverse effect or. water euality withir: the affected drainage. Another potential for an effect on surface water in East Salt Creek is related to the outcrop of the Cameo coal seam upstream of ?icClane Cam-on. because eANloration indicated that mining will r,et progress into the saturated portion of the mines strata, discharge should net occur from these strata. The operation therefore, will not diminish the ouantity or quality of East Salt Creek water in the tributary aquifer during this permit terv:. Therefore, pursuant to 2.06.8(5)(ii), the Division finds the proposed operations will not materially damage the ouantity and quality of a;ater in surface and underground water systems that supply those alluvial valley floors er portions of alluvial galley floors. Alluvial Palley Floor Findings Stith Regard to Preserving Essential 'r.vdrologic Functions- The potential for an.' effect on surface water quality and quantity in East Salt Creek was discussed above. Even though the potential for impact is minimal, Salt Creek ?Lining Company has proposed to establish a monitoring network to verif;~ these projections and which would identify detrimental effects if they were to occur. This monitoring network is establishes to detect changes in surface and ground roarer toithin the alluvial valley floor. Once successful reclamation of the operation is achieved the essential hydrologic functions of the alluvial valle?• floor will be restored. Coal material will be disposed of, topsoil Brill be spread, all openings will be sealed and a stable, protective stand of vegetation will be established on the area. Therefore, pursuant to Rule 3.06.8(5)(iii), the Division ,`.finds that the proposed surface coal mining and reclamation operation e.•ill preserve, throughout the mining and reclamation process, the essential hydrologic function=_ of the alluvial valley floor. \'I II. ldater E and Rep and 4. Rortinns of the application relevant to surface and ground water rights in the vicinity of the mine have been submitted to the Cffice of the State Engineer, Division of Eater Resources. The State Engineer's Office has dete^.nined that there are ne problems with the operation with respect to water rights. cement -