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• MASS BALANCE <br />CEC disposed of 38,576 tons of mixed fly and bottom ash, from the Coors <br />Brewing Company/Trigen Colorado Energy Corporation (see Ash Disposal <br />Data) facility, in the South end of "B" Pit using approximately 14,000 BCY <br />of overburden material to cover the disposal area, and to control dust and <br />fugitive debris in the immediate area. Again, relatively small amounts of <br />overburden were excavated from the Long Term Spoil area. Approximately <br />50,000 BCY of topsand was moved to complete work begun in 1994 on final <br />reclamation of the tipple area, evaporation pond and road areas, and a re- <br />work area, in order that these areas could accommodate seeding activity. <br />"B" PIT VOID AREA ......................................1,305,600 <br />"A" PIT VOID AREA ...................................... 157.800 <br />EXCESS SPOIL REMAINING ON SITE........ 816,100 <br />* The comparative differences in "overburden" versus "ash disposed" <br />amounts between 1994 and 1995 can be explained as follows: <br />(1) overburden material is used to both create the ash disposal cell and <br />cover the ash once deposited, (2) 1994 saw the creation of a number of <br />small cells as alignment of the cells in "B" pit was established, and <br />(3) in 1995 only two new cells were created thus significantly lowering <br />the amount of overburden required. <br />** Variation in the "A" pit void area (1994 to 1995 reports) results from the <br />use of the 1986 reclamation plan to compute the 1994 void space, <br />whereas the 1995 calculation relies on the currently-suggested plans for <br />final post-mining contour and drainage configurations. <br />Transitioning to CAD System <br />The 1994 AHR Report addressed CEC's concerns relative to comparison of <br />contouring between the 1993 and 1994 mapping activities. Since the <br />reliability of the map work is key to most other activities relative to <br />reclamation, it is important to build confidence in this data. Since this is only <br />the second year the CAD system has been used for this mapping, a further <br />review of the contour discrepancies (year to year) was conducted. This <br />review affirmed and reinforced statements made in the 1994 AHR Report, <br />that the discrepancies then noted were the result of earlier techniques and <br />carried forward errors, problems which should be eliminated through the <br />AHR-1995 -112- STIPiTLATION #17 <br />