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May Day & Idaho Mill Complex - General Portal Repair Comments <br />Page 3 <br />March 11, 2011 <br />design calculations. Calculations shall include loads, methods, assumptions, <br />results, and safety factors. Shop drawings and calculations shall be signed and <br />stamped by a Registered Engineer in the State of Colorado. <br />d. Submittal(s) that clearly state the proposed location of each portal headwall after <br />exposure of actual ground conditions. Each submittal shall show the proposed <br />portal headwall station, ground conditions including both soils and rock at the <br />proposed headwall using terminology consistent with that used in other <br />attachments and exhibits, the rock cover over the crown, and the total cover over <br />the crown. <br />Attachment T-3, Permit Area Geology: <br />7. Figure T-3a indicates a fault line that is part of the May Day Idaho Fault System <br />intersects the May Day No. 1 Portal. The existence of a fault suggests geologic hazards <br />are present and should initiate higher factors of safety for structures designed to stabilize <br />the Portal No. 1 highwall and protect the mill inside. Please address the Division's <br />concerns about the fault in the geologic hazard investigation/assessment (see Items 1, 3 <br />and 6 above). <br />If either you or the applicants have any questions regarding the comments above, please call me <br />at (303) 866-3567, extension 8169. <br />mAmin\tc1\m-1981-185 maydayidaWportalcomments_mem11marl 1.docx