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Attachment Powderhorn Coal Company - Additional information that should be requested from the applicant. 1) A mare complete description of the Rapid Creek - Cottonwood Creek flow system (Reservoirs, streams, ditches, water users, etc.) should be provided. We are particularly croncerned with water released from the reservoirs which crosses the area to be undermined to reach downstream users. The applicant should describe the frequency and amount of water released, and identify the location of downstream users and the amount they use. 2) The source of water for the spring located in the NW 1/4 of Section 2, T11S, R98W which is used for domestic water should be identified. 3) The applicant's discussion of probable hydrologic consequences should be expanded to more specifically consider the possible effects of the proposed operations. This assessment will be used to complete the AVF and CNIS findings. The following items should be included: a) A technical assessment of the probable hydrologic consequences of undermining Cottonwood Creek and Rapid Creek with specific attention to possible depletion of surface flow, b) Consideration of the effects of mining upon the domestic spring, and c) A technical assessment of possible effects of mine water discharge and leachate from coal refuse piles upon the water quality of monthly average flows in the Colorado River. 4) The applicant should expand the proposed surface water monitoring plan. The monitoring station located below the confluence of Rapid Creek and Cotton- wood Creek should be shown on a map. Additional monitoring stations should be added so that there are monitoring stations above and below the area to be undermined. All stations should be equipped with continuous recorders. S) The applicant should either identify alternative sources of water should material damage occur, or provide plans for other types of mitigation for the flow in Rapid and Cottonwood Creeks and the domestic spring. • •