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the Toxics Characteristic Leaching Procedure (TCLP), and results are submitted as part <br />of the AHR report. Should Trigen receive coal from a new supply source, additional fly <br />ash 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 1996. CEC disposed of all non - salvageable components of these facilities <br />in A -Pit. The 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 location of the on -site overburden soils (the long -term spoil stockpile area) is shown <br />on the mine plan maps, specifically those presented annually as part of the AHR report <br />(Appendices M -1, Q -1 and L -5). Soil mass balance calculations are also updated <br />annually in the AHR report, to provide information on the availability of overburden soils <br />from the long term spoil stockpile area to supply the required six (6) feet of overburden <br />soils that are placed over the disposed A/MWR. These calculations also confirm that an <br />additional two (2) feet of topsand is available to be placed on top of the overburden soil, . <br />to meet the total cover requirement of eight (8) feet. It is unlikely that the long -term spoil <br />stockpile would ever become inactive due to the WCDH regulations, requiring the <br />• covering of the A/MWR disposal "face" every 48 hours (the maximum time period). <br />However, if the long -term spoil stockpile did become inactive, or if both A -Pit and B -Pit <br />were to be completely reclaimed before the long -term spoil pile could be completely <br />utilized, any remaining long -term spoil area soils will be graded and tied into the <br />undisturbed natural terrain, then scarified, topsanded, fertilized and revegetated. <br />The final Reclamation Contour and Drainage Plan Map (Appendix Q -1) has been <br />designed to improve and promote positive surface water drainage away from both the A- <br />Pit and B -Pit cell areas. For this reason, the proposed final ground surface contour <br />elevations over the pit cell areas have been modified from those initially shown on the <br />1986 Reclamation Plan map in order to accommodate the A/MWR disposal and the <br />backfill operations. The proposed final elevation contours are sloped to provide <br />maximum air space volumes for the remaining A/MWR disposal operations in each pit <br />cell, as well as to reduce the potential amount of surface water runoff infiltration into the <br />subsurface and the potential accumulation of infiltrated• water within the pits and/or <br />saturation of the disposed A/MWR. The revised design overall serves to improve the <br />final reclamation condition of the two disposal sites. CEC also contends that this is a <br />good business practice now that mining is no longer taking place, and since A/MWR <br />disposal will continue for several years. <br />114 7/11 <br />