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fly ash and bottom ash) are obtained from the CGEC power plant and <br />submitted to local laboratories for testing. These samples are analyzed <br />using the Toxicity Characteristic Leaching Procedure (TCLP), and for <br />radioactivity. Copies of the analysis results are included in this Section of <br />the AHR Report (pages 79 to 83). Ash disposal reports, detailing the daily <br />and monthly transportation and disposal activity at the Keenesburg site, can <br />also be found in this Section, beginning at page 84. <br />Mine Waste Rock Disposal <br />CEC obtained approvals from CDRMS (Minor Revision #34), from <br />CDPHE, and from Weld County, to dispose of mine waste rock at the <br />Keenesburg Mine site. During 1998 and 1999 a total of 12,467 tons of <br />mine waste rock, the residual material from "hard rock" mine reclamation <br />sites in the Clear Creek drainage, near Idaho Springs, Colorado, was <br />transported to the Keenesburg site for disposal. This material was placed, in <br />a layer approximately four feet thick, between layers of ash in the existing <br />disposal pit (B -Pit). The specific intent of this method of mine waste rock <br />disposal, as described in MR #34, was to isolate the material and thus <br />minimize the possibility for future contamination. <br />No additional mine waste rock was received for disposal during the calendar <br />year 2012. The total quantity of this material placed at the Keenesburg site <br />is still 12,467 tons. The placement location and horizontal extent of the <br />mine waste rock has been identified on the Existing Surface Features and <br />Utilities Map (page 122). <br />AHR -2012 -78- <br />