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-l o- 3. Surface coal mining and reclamation operations will be conducted to preserve, throughout the mining and reclamation process, the essential hydrologic functions of the alluvial valley floor. The alluvial valley floor will not be physically disturbed by the operation. The applicant has not identified any significant hydrologic effect that would disturb the essential hydrologic functions of the Canadian River alluvial valley floor, The operation is in compliance with the requirements of this section. VIII. Water Rights - Rules 2.04.7(3), 2.05.6(3)(a)(ii), 2.07.6(2)(c) and The operation will require 10,000 gallons per day (7 gpm) for dust suppression, washdown of equipment and domestic uses. The applicant has obtained an adjudicated water right for ground water under Colorado Water Case Number 79CW226. There are no water rights listed in the State Engineer's Office Stream Alpha listing for surface water in Mann Draw. A listing of all wells within the general area of the mine is contained in Table 5b of the permit application. Of the listed wells, only 3 are located within 3 miles of the permit boundary. Receiving Stream Standards The Canadian River and its tributaries are classified by the Colorado Water Quality Control Commission as "B1", suitable for all raw water uses except primary contact. The Water Quality Control Commission has deemed the operation in compliance with NPDES Permit No. CO-0036854, except for a violation received in the second quarter of 1984 for exceeding the allowable total suspended solids. The Bourg Mine will not impact the quality or quantity of ground water in the 3 wells within 3 miles of the permit area, since the ground water within the mine site is hydrologically isolated from ground water tributary to these wells. The Bourg Mine may affect surface water rights through storage of water within sediment ponds. The applicant states that the impact to senior surface water rights will be minimal, since the flow of water in Mann Draw contributes little to the flow of the Canadian River. The applicant also states that water held in the sediment ponds would be available for augmentation on call. The applicant has obtained an approved augmentation plan for water stored in sediment ponds. The operation is in compliance with the requirements of this section. IX. Probable Hydrologic Consequences of Mining and Cumulative Impacts zr+,~.~r-~-~sr-z ~~r~rr ,. This assessment of probable hydrologic consequences and cumulative hydrologic impacts study of the Bourg Mine has been prepared by the Colorado Mined Land Reclamation Division (CMLRD). The cumulative hydrologic impacts study (CHIS) was prepared pursuant to Rule 2.07.6(2 )(c ). This CHIS assesses the probable cumulative hydrologic impacts of all anticipated coal mining operations upon the general area of the North Park Coal Field. Included in this assessment are all existing coal mines and those proposed coal mines for which permit applications have been submitted to the Division.