2010-10-21_REVISION - C1982057 - Laserfiche WebLink

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south of PM-1B and ends just north of PM-3. Cross-section C-C' runs along north side of the PM-1 drainage area. This cross-section begins at the east edge of the disturbance and ends just north of stock tank T-25. It runs from east-northeast to west-southwest. Numerous, random elevation points were taken along each of these cross-section lines, as shown on Inspection Maps I and 2, and they were compared with the approved post- mining topography at those points from Exhibit 20-2. - Cross-section A-A' runs along the north side of permanent, post-mining drainage channel PM-3 and is approximately 3,700 feet in length. The data shows that the majority of the backfilled area along cross-section A-A' varies from the approved post- mining topography from +1.6 feet to -5.4 feet (with one point showing a -9.4 foot difference). Based on the Division's data it appears as though the Seneca II-W Mine has backfilled and regraded the cross-section A-A' area to the approved post-mining topography. Please see the Division's cross-section A-A' at the end of this inspection report. The data for cross-section A-A' is shown in the following chart. Point ID GPS Height Northing Easting Z Corr. Correct Z EA20-2 Z Z Diff. Station 27 (A) 8003.2 4470526.0 310908.8 40.620 8043.781 8045 -1.219 0+00 28 7973.7 4470493.4 310831.0 40.620 8014.345 8015 -0.655 2+77 29 7931.0 4470458.6 310747.5 40.620 7971.600 7970 1.600 5+74 30 7893.7 4470434.5 310689.1 40.620 7934.317 7935 -0.683 7+81 31 7812.8 4470368.0 310536.2 40.620 7853.371 7855 -1.629 13+28 32 7770.0 4470317.1 310409.2 40.620 7810.629 7820 -9.371 17+77 33 7698.9 4470264.0 310281.1 40.620 7739.568 7745 -5.432 22+32 34 7670.1 4470220.3 310177.1 40.620 7710.687 7715 -4.313 26+02 35 7666.8 4470179.4 310083.2 40.620 7707.376 7710 -2.624 29+38 36 7609.5 4470132.1 309999.5 40.620 7650.106 7655 -4.894 32+53 37 (A') 7518.4 4470095.4 309877.6 40.620 7559.063 7560 -0.937 36+71 The cross-section A-A' area was stable, with no settling or cracking observed in the backfill at the time of the inspection. There was some minor rilling in some areas but it did not appear to be a problem at this time. - Cross-section B-B' runs along permanent, post-mining drainage channel PM-2A and bisects channels PM-1B, PM-IA and PM-3. It is approximately 4,700 feet in length. The data shows that the majority of the backfilled area along cross-section B-B' varies from the approved post-mining topography from +3.9 feet to -3.7 feet (with one point showing a -7.0 foot difference). Based on the Division's data it appears as though the Seneca II-W Mine has backfilled and regraded the cross-section B-B' area to the approved post-mining topography Please see the Division's cross-section B-B' at the end of this inspection report. The data for cross-section B-B' is shown in the following chart. Point ID GPS Height Northing Easting Z Corr. Correct Z EA20-2 Z Z Diff. Station 13 (B) 7971.0 4468731.1 310148.4 40.620 8011.595 8010 1.595 0+00 14 7978.3 4468834.4 310145.1 40.620 8018.892 8020 -1.108 3+39