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Mr. Gregg R. Squire <br />• EEC Technical Revision <br />April 29, 1986 <br />Page 4 <br />- File No. C-81-044 <br />For future reference, if the pile height is to be increased, the load <br />may exceed the culvert's strength, thus requiring removal anc <br />installation of a rock drain or other suitable drain prior to <br />increase in the height of the pile. <br />RESPONSE: <br />Page IV-50d has been revised to address this issue. Revision attached. <br />8. The NPDES permit CO-0034142 describes outfalls 002 and 003 as <br />consisting of underground mine drainage from Mines No. 9 and 5. The <br />operator must contact the Health Department to include Mine No. 6 in <br />this description. <br />RESPONSE: <br />• NPDES permit CO-0034142 will be modified accordingly, through the Health <br />Department. <br />9. The peak flow determination in Appendix IV-4 is uncorrected for <br />inches of rainfall. Multiplying by 1.7 inches of rainfall gives 29 <br />cfs for the 10 year peak. The culvert is capable of passing this <br />flow with six feet of headwater. With this depth of headwater, <br />setlimentation may occur at the inlet and diligent maintenance will be <br />required. <br />RESPONSE: <br />Appendix IV-4 has been revised to address this issue. Revision attached. <br />Development Area Boundaries <br />ON page IV-50f and page IV-55 statements are made that mining sections <br />may be adjusted to meet production requirements. These statements need to <br />be modified to clarify that mining in the E Seam wiil only extend to the <br />development boundaries reviewed in this revision. <br />RESPONSE: <br />. Pages IV-50f and IV-55 have been revised to address this issue. Revisions <br />attached. <br />