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• Transitionina to Computer-aided Drafting System <br />The 1994 AHR Report initially addressed CEC's concerns relative to comparison of <br />contouring between the former 1993 and 1994 mapping activities. Since the <br />reliability of the map work is key to most other CEC activities relative to reclamation, <br />it is important to build reliability into this database. Since this is the third year the <br />Computer-aided Drafting (CAD) system has been used for CEC mapping purposes, <br />fiuther reviews of contour discrepancies (year to year) have been conducted. The <br />reviews confirm and reinforce statements presented in the 1994 and 1995 AHR <br />Reports that the discrepancies then noted were the results of earlier mapping <br />techniques and carried forward minor errors, problems which CEC believes have <br />been significantly reduced or eliminated through the continued use of the CAD <br />system. Comparison of the 1996 mapping data to the 1994 and 1995 work products <br />indicates only a few questionable contour differences, although none significant <br />enough to call into question the modeling technique. <br />Software Explanation <br />SOFTDESK/ADCADD SOFTWARE CIVII,/SURVEY, EARTHWORKS and <br />DIGITAL TERRAIN MODELING continues to be used to compare the 1994 and <br />1995 site elevation data with the recent 1996 site elevation data. This software <br />program is used to first calculate the position and elevation of each elevation point <br />and points along each elevation contour and then generates a computer model <br />representation of each ground surface. The computer-generated ground surfaces are <br />then used in determining airspace and soil volumes and in performing cut/fill <br />calculations. The average end-area method is used in all volume calculations, and the <br />prismoidal grid method is used for all cut/fill calculations. <br />n <br />AHR-1996 -12 2 - Stipulation # 17 <br />