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.- -9- 817.80 Other Transportation Facilities 29. Prior to placement of drainage culverts, the applicant shall subni[ to the regulatory authorities a revised design for pipes 10 and 11 incorpor- ating sufficient flow capacity to prevent ditch overtopping. The appli- cant shall also submit a plan and design drawings for road Culver[ trash racks to be installed on culverts of 30 inches diameter or less. 817.81-817.93 Coal Processing Wastes 30. ARCO Coal must complete Phase II of the geotechnical and hydrologic studies of the initial waste pile, as outlined in proposal letter 3. 2. 9. A, included with their permit application. ARCO is further directed to include the report entitled "Report, Preliminary Design Recommendations, Initial Waste Rock Pile, Mt. Gunnison Coal '.tine, Somerset County, Colorado, for Arco Coal Company," prepared by Geo-Hydro Consultants, Inc. as an exhibit within the permit application. Further, ARCO is directed [o prepare appropriate detailed design narrative, plans and cross-sections of the initial waste pile, and to include them within the permit application. The detailed engineering design shall conform with the recommendations outlined within the Geo-Hydro Consultants Phase I report. The detailed engineering design shall be revised to reflect any variation from the preliminary design assumptions determined during. the completion of the Phase II study. No waste material shall be deposi- red within the initial waste pile prior to completion of Phase I and Phase II studies and the approval, by the regulatory authorit}', of the appropriate revised detailed engineering plans for the initial waste pile. 31. ARCO Coal must complete the preliminary stability evaluation for. the upper waste rock pile described within proposal letter 3.2.9.B, included within the revised permit application. In addition, ARCO is directed to complete a thorough geotechnical analysis and detailed engineering design and plans of th upper waste pile and the access road to the upper waste pile. ARCO is directed to include copies of the report of the geotechni- cal analyses and detailed design narrative, plans, and cross-sections in the permit application. No construction shall commence on the access road or the upper waste pile until approval, by the regulatory authority, of the required geotechnical analyses and detailed engineering design. 32. ARCO Coal must rerun chemical analyses of F-seam roof, floor, interburden and coal from the original cores analyzed (5011-2, S01f-6, 5011-38, 501-t-50, S011-59, 5011-65, and t1G-9) or from six alternate cores representative of the mine plan area. The analyses are to be run for those parameters required by the regulatory authority. These analyses shall be submitted to the regulatory authority within 6 months of the permit Sssuance, and shall be reported as inclusions to the permit application.