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• Mine Waste Rock Disposal <br />CEC has received approval from CDPHE, from Weld County, and from <br />CDMG (Minor Revision #34), to dispose of certain mine waste rock at the <br />Keenesburg Mine site. During 1998 and 1999 a total of 12,467tons of mine <br />waste rock, from sites in the Clear Creek drainage near Idaho Springs, was <br />transported to the Keenesburg site. This material has been placed, in a layer <br />about four feet thick, between "lifts" of ash in the existing disposal pit (B- <br />Pit). The specific intent the mine waste rock placement, as described in MR <br />#34, is to minimize the possibility for any future contamination. <br />No additional mine waste rock was received for disposal during the calendar <br />year 2002. Thus the total quantity of this material at the site remains at <br />12,467 tons. The placement and horizontal extent of the mine waste rock <br />has been identified on the Existing Surface Features and Utilities Map (page <br />127). <br />u <br />I• <br />AHR-2002 -83- <br />