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<br />~ STATE OF COLORADO <br />MINED LAND RECLAMATION DIVISION <br />0 <br />Deoartmenl of Natural Resources ,~ ~'-4;~ <br />t 313 Sherman S.. Room 215 <br />~ <br />Denver. CO 80203 ' <br />`~~ ~ ^" <br />303 866 35c7 ~ ~~~" ~~ <br />' rP IE' <br />Fnx 303 a32~8t06 <br />Fur Furry. <br />Go.env <br />Fred R. 6arna <br />pv5pn preaor <br />March 13, 1990 <br />Mr. Jim Hendricks <br />Pueblo ~oal Incorporated <br />278 Sawyer Drive <br />Suite lA <br />Durango, Colorado 81301 <br />RF: Carbon Junction Permit kenewal ~1, File )lo. L-82-054 <br />Dear Mr. Hendricks: <br />In reviewing the approved drainage and sediment control plans for the mine <br />site recently, a concern has arisen which we will need to resolve before a <br />permit renewal could be issued. We are requesting that you address the issue <br />as discussed below, along with the previously identified concerns, by <br />June 1, 1990. <br />Appendix 5-2 of the permit application indicates that design criteria for all <br />of the various diversion and collection diiches at the mine, including the <br />proposed permanent channel realignment of Carbon Junction Drainage were based <br />on handling runoff from the 10-year, 24-hour precipitation event. In order to <br />comply witn the requirements of kule 4.09.1(5) and 4.05.2(7), the permanent <br />channel realignment as well as diversions above the fill and collection <br />channels which receive runoff from the fill would need to be designed and <br />constructed to safely pass the runoff from a 100-year, 24-hour precipitation <br />event. 7ne criteria would apparently apply to Diversion Ditch No. 2, the past <br />Fill and West Fill downdrains, and the permanent channel realignment. <br />Upon completion of the approved mining and reclamation plan, flows from Tarpon <br />Junction Drainage above the disturbed area would be routed around the excess <br />Spoil fill via the permanent channel realignment. However, lrwasures to insure <br />that f]ows from the drainage above the fill would be diverted away from the <br />fill into stabilized cnannels off the fill during operational and construction <br />phases are not specified. <br />