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-6- 30. Within 60 days of approval of the mining permit, the applicant shall pro- vide ditch dimensions for the entire "north topsoil ditch" in the D-Portal area. These plans must be submitted and approved prior to the onset of con- struction at the D-Portal area. 31. Within 60 days of approval of the mining permit, the applicant must sub- mit the calculations and assumptions used to size the railroad loop sedimenta- tion ponds, and must resize the outlet culvert at sedimentation pond ~/4 in the Railroad Loop to prevent excessive ponding at the entrance or 3ustify the present sizing with appropriate calculations. The lower segment of the sub- area R4 refuse ditch must also be resized to accomodate the 10-year 24-hour flow. This must be completed and plans approved by the regulatory authority prior to the onset of work at the Railroad Loop. 32. The applicant shall submit to the regulatory authority within 90 days a modified restoration plan for Scullion Gulch to omit the thirteen proposed in-channel rock check dams. In lieu of these, the applicant shall install three dams or sediment traps, built to SCS or U.S. Forest Service specifica- tions, at the downstream construction limits in Scullion Gulch. These traps should provide sufficient storage to store one year of sediment accumulation from D-Portal area. The traps must be installed prior to the onset of recla- mation, cleaned periodically throughout the reclamation period and removed when the appropriate regulatory authority has deemed the reclamation profess effective. Codified restoration plans reflecting the above stipulations`must be submitted to the regulatory authority within 90 days of permit approval. 33. The applicant must provide the regulatory authority with plans to resize the D-Portal area and DP-1 principal spillway to allow a maximum head of only one foot above the riser crest or provide additional freeboard between the riser crest and emergency spillway crest. The revised plan should be submit- ted within 90 days of permit approval. 34. Within 30 days of permit approval, the applicant shall commit to the regulatory authority to comply with the following requirements: (a) to implement sediment control measures prior to the onset of construction of the coal transport and storage area; (b) to provide emergency and principal spillway outlets with appropriate erosion control prior to the construction of sediment ponds; (c) to provide baffles on each of the Refuse Disposal Area sediment ponds as necessary; (d) to provide quarterly reports to regulatory authorities as~required by Rule 4.05.9(8) of the Colorado Regulatory Program; (e) to notify the regulatory authorities within five days after analytical results of surface water samples indicate that noncompliance with permit conditions or applicable standards has occurred, as required by Rule 4.05.13(2}(a)(ii) of the Colorado Regulatory Program;