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Mine Waste Rock Disposal <br />Subsequent to the submittal of the 1997 AHR Report CEC has also received <br />approval from CDPHE, from Weld County, and from CDMG (Minor <br />Revision #34), to dispose of mine waste rock at the Keenesburg Mine site. <br />Between November 29'~ and December 15~`, 1999, a total of 1,828 tons of <br />mine waste rock were transported from an "orphaned" mine site (in Virginia <br />Canyon) near Idaho Springs, Colorado, and deposited in a single 4t foot <br />layer, across a horizontal expanse covering 0.26 acres within B-Pit. The mine <br />waste rock is being treated in a manner which will isolate it within layers of <br />ash in the existing disposal pit (B-Pit) to protect against the possibility of <br />future contamination. By the close of 1999, the covering ash layer had almost <br />completely advanced over the waste rock with full cover to be achieved in <br />early 2000. <br />When added to the mine waste rock previously buried in B-Pit during 1998, <br />this brings the total quantity disposed at the site to 12,467 tons. The location <br />and horizontal extent of this material has been identified on the "Existing <br />Surface Features and Utilities Map". <br /> <br /> <br />AItR-1999 -83- Stipulation #24-25 <br />