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Computer-Aided Drafting System <br />The 1994 AHR Report initially addressed CEC's concerns relative to <br />comparison of contouring between the former 1993 and 1994 mapping <br />activities. Since the reliability of the map work is key to most other CEC <br />activities relative to reclamation, it is important to build reliability into this <br />database. This is the fifth year the Computer-aided Drafting (CAD) system <br />has been used for CEC's mapping purposes. As with previous years, a <br />review of the contour discrepancies (year to year) has been conducted. This <br />continuing review affirms and reinforces statements made in the 1994 AHR <br />Report, that the discrepancies, as noted, were the result of earlier mapping <br />techniques. CEC believes that these errors have been substantially reduced <br />through the continued use of the CAD system. Our comparison of the 1998 <br />mapping data to the previous four years work products suggests only a few <br />questionable contour differences, none significant enough to call into <br />question the modeling technique <br />• Software Explanation <br />SOFTDESK/ADCADD SOFTWARE CIVIL/SURVEY, with <br />EARTHWORKS and DIGITAL TERRAIN MODELING MODULES <br />continues to be used to compare the 1994, 1995 and 1996 and 1997 site <br />elevation data with the recent 1998 site elevation data. This software <br />program is used to first calculate the position and elevation of each <br />elevation point and points along each elevation contour and then generates a <br />computer model representation of the ground surface. The computer- <br />generated ground surfaces are then used in determining airspace and soil <br />volumes and in performing cut/fill calculations. The average end-area <br />method is used in all volume calculations and the prismordial grid method <br />is used in all cut/fill calculations. <br />L <br />AHR-1998 _IZg_ STIPULATION #17 <br />