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Transitioning to Computer-Aided Drafting System <br />The 1994 AHR Report initially addressed CEC's concerns relative to <br />comparison of contouring between the previous 1993 and 1994 mapping <br />activities. Since reliability of the map work is key to most other activities <br />relative to reclamation, it is unportant to build reliability into this database. <br />This is the fourth year the Computer-aided Drafting (CAD) system has been <br />used for CEC's mapping purposes, and as with previous years, a review of <br />the contour discrepancies (year to year) was again conducted. This review <br />affirms and reinforces statements made in the 1994 AIIR Report, that the <br />discrepancies then noted were the result of earlier techniques and carried <br />forward errors, problems which CEC believes have been eliminated through <br />continued use of the CAD system. Our comparison of the 1997 mapping data <br />to the previous tluee years work products suggests only a few questionable <br />contor~r differences, none significant enough to call into question the <br />modeling technique <br />• Software Explanation <br />SOFTDESK/ADCADD SOFTWARE CIVIL/SURVEY, EARTI-IWORKS <br />and DIGITAL TERRAINE MODELING continues to be used to compare <br />the 1994, 1995 and 1996 site elevation data with the recent 1997 site <br />elevation data. This software prograin is used to first calculate the position <br />and elevation of each elevation point acid points along each elevation contour, <br />and generates a computer model representation of each ground surface. The <br />computer-generated growld surfaces are then used in determining airspace <br />and soil volumes a,id in performing cut/fill calculations. The average end-area <br />method is used in all volume calculations, and the prismordial grid method is <br />used in all cut/fill calculations. <br /> <br />AHR-1997 _125_ STIPULATION #17 <br />