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<br /> <br /> <br /> <br /> <br />Permit Number C1981028 Prepared by: R. Reilley, MS, GISP <br />SL9 5 <br /> <br />areas required addressing. <br /> <br />The DRMS utilized a “Bad Elf” GNSS measurement instrument to collect location data that incudes <br />elevation information. The Bad Elf provided a benchmark elevation value of 4752.06 feet above sea level, <br />while the known mine measurement for this control point, #1111, is 4813.92 feet above sea level, <br />representing a differential of 61.86 feet lower for the Bad Elf. This 61.86 foot discrepancy was adjusted <br />for using the orthometric height calculator to convert GPS measurements to height above mean sea level <br />(HMSL) and adding 18.94 meters for Geoid Height bringing the HMSL for this point to 4814.19, well <br />within an accurate measurement when compared to the known benchmark. <br /> <br /> Map 1: Overview of the Keenesburg mine. The current permit boundary is shown in dark red and the areas for <br />the SL9 bond release are shown in orange. The circles represent points collected to verify approximate original <br />contour. <br />