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above the final Moffat pit. The two additional control points (back-sites) were established in <br />undisturbed ground northwest and south of the reference point. The back-sites were <br />established to verify the location of the reference point. The monuments were installed in <br />pairs with the first pair, SM-1 and SM-2, established in the lower third of the final pit area. <br />SM-1 was placed approximately 130 feet south of the final pit highwall and SM-2 was placed <br />approximately 340 feet south of the final pit highwall. The second pair, SM-3 and SM-4, <br />were installed approximately mid-way along the pit. SM-3 was placed approximately 110 feet <br />south of the highwall and SM-4 was placed approximately 325 feet south of the highwall. <br />The last pair, SM-5 and SM-6 was installed in the upper third of final pit area. SM-5 was <br />placed approximately 150 south of the highwall and SM-6 was placed approximately 350 feet <br />south of the highwall. The monuments consist of T to 8' sections of 2-1/2" diameter drill steel <br />driven 5-1/2' to 6-1/2' into the pit backfill material. Locations of the stability monuments are <br />displayed on Plate 3. <br />The monuments were surveyed quarterly the first year and annually thereafter. In 2003, a <br />level loop was surveyed providing elevation information. However, due to an equipment <br />malfunction, x and y coordinates were lost. The 2008 stability monument survey was <br />performed September 22, 2008. The coordinates of the initial monument survey and <br />subsequent surveys are provided in Table 16. <br />1 16