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• the Toxics Characteristic Leaching Procedure (TCLP), and results aze submitted with the <br />AHR report. Should Trigen receive coal from a new supply source, additional fly ash <br />and bottom ash samples will be collected, analyzed and reported. <br />The CEC operation regarding the dismantling of the on-site coal handling facilities was <br />completed in ]996. CEC disposed of all non-salvageable components of these facilities <br />in A-Pit. These facilities areas were then topsanded and revegetated. In accordance with <br />CDMG Rule 4.11.4, "Disposal of Non-coal Wastes", the coal handling facilities waste <br />debris was buried to between the limits of five (5) feet above the local ground water table <br />and four (4) feet below AOC. The bulk of the waste debris was concrete, metal, rubber, <br />and small amounts of wood, however, no hazardous material or liquid substances were <br />disposed in this manner. <br />The on-site long-term overburden soils (spoil azea stockpile) is shown on the Mine Plan <br />Map presented in Appendix M-2. Soil mass balance calculations for 1996 indicate that <br />there are approximately 353,000 BCY stockpiled, and that this existing pile is <br />approximately 20 feet above AOC. Calculations also indicate that if CEC backfills over <br />both A- and B-Pits as A/MWR disposal continues, with six (6) feet of overburden soils <br />placed above the disposed A/MWR, approximately 281,000 BCY of the overburden soils <br />will be needed as cover soils. An additional two (2) feet of topsand will meet the DMG's <br />total cover requirement of eight (8) feet. It is highly unlikely that this long-term spoil <br />stockpile will become inactive due to the WCDH regulations, since covering of the <br />• A/MWR face is required every 48 hours 9maximum time period), However, if the long- <br />term spoil pile should become inactive or if both A- and B-Pits were to be completely <br />reclaimed before the long-term spoil pile could be completely utilized, the remaining <br />long-term spoil area soils will be graded and tied into the undisturbed natural terrain, and <br />then scarified, topsanded, fertilized and revegetated. <br />The final Reclamation Contour and Drainage Plan Map (Appendix Q) has been designed <br />to improve and promote positive surface water drainage away from both the A- and B-Pit <br />cell areas. For this reason, the proposed final ground surface contour elevations over the <br />pit cell areas have modified from those initially shown on the 1986 Reclamation Plan <br />map in order to accommodate the pit A/MWR disposal and backfilling operations. The <br />proposed final elevation contours are sloped to provide maximum air space volumes for <br />the remaining A/MWR disposal operations in each pit cell, as well as to reduce the <br />potential amount of surface water runoff infiltration into the subsurface and the potential <br />accumulation of infiltrated water within the pits andlor saturation of the disposed <br />A/MWR. The revised designs overall serve to improve the final reclamation condition of <br />the two disposal sites. CEC also feels that this is good business practice now that mining <br />is no longer taking place and since A/MWR disposal will continue through several future <br />years. <br />r~ <br />114 10100 <br />