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Spring 2013 Subsidence and Geologic Field Observations <br />South of Divide and Dry Fork Mining Areas (E -Seam) <br />4.2 Traverse B -B' <br />Traverse B -B' begins at Traverse A -A' and continues in a west/northwestward direction along a <br />ridgeline above mined E -seam Longwall Panel E 1 and a small portion of mined E -seam Longwall <br />Panel E2 to numerous MDW pads (see Map 1 and 2). MDW pads are accessible from this traverse <br />including El-15, El-19, El-26.5, El-30.5, El-34, El-38, E 1 -42, E2-38, E242, E2 -44.5, El-45, <br />and E2 -47.5. However, MDW pads E1 -15 and E1 -19, along with their access road, have now been <br />reclaimed and are no longer accessible. <br />This traverse is generally flat and stable on soil and colluvium derived from the Wasatch <br />Formation and from intrusive rocks of the West Elk Mountains overlying consolidated bedrock <br />units of the Barren Member of the Mesaverde Formation. Overburden depths along this traverse <br />vary from 1,090 to 1,460 feet over the B -seam and 850 to 1,230 feet over the E -seam. <br />No changes were observed along this traverse or at the various MDW pads. <br />4.3 Traverse C -C' <br />This traverse follows Dry Fork Road from Monument Dam (Minnesota Reservoir) eastward to the <br />where the road crosses Deep Creek (see Maps 1 and 2). Several portions of this traverse parallel <br />the Dry Fork itself. Portions of this traverse are above mined E -seam Longwall Panel E1 through <br />E4 as well as unmined portions of E -seam Longwall Panels E5 and E6. The extreme western end <br />of this traverse is adjacent to Minnesota Reservoir and outside the proposed E -seam mining <br />influences of Longwall Panels El through E9. <br />Several side roads lead a short distance away from this traverse (Dry Fork Road) to MDW pads. <br />Previously, these roads and pads were described as separate traverses. Beginning in 2013, only the <br />longest of these side roads to MDW pads will be individually discussed as a separate traverse (see <br />Traverse D -D', E -E', and F -F'). The smaller traverses will be included in the discussion for <br />Traverse C -C'. <br />Thick soil and colluvium derived primarily from the Wasatch Formation is observed along <br />Traverse C -C' with E -seam overburden depths ranging from 400 to 1,200 feet. The estimated <br />thickness of the surficial material ranges from 75 to 250 feet. <br />831 - 032.795 Wright Water Engineers, Inc. Page 9 <br />September 2013 <br />