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Subsidence Field Observations <br />West Elk Mine <br />July 22-24, 2003 <br />4.2.4 Traverse I-I' <br />Traverse I-I' is a foot (and pace) traverse-2,500 feet in length-southward on the Deep Creek <br />trail. <br />• Traveled above the headgate entries of the eastern part of longwall Panel 16 thence above the <br />mined-out part of longwall Panel 17 and southward on the trail beyond the area of mining <br />influence. <br />• Material traversed was the Deep Creek alluvium and colluvium. The material ranged from <br />coarse to fine gravel, fine gravel and sand, and also clay and soil. <br />• The overburden depth to the B-Seam ranges from about 1,050 to 1,250 feet. <br />• No subsidence features (cracks, bulges) were observed. Only occasional, irregular <br />desiccation cracks, as much as 0.25 inch wide, were observed in clay and silt. <br />Location 7: <br />Spring located near the mouth of anorthwest-trending side canyon on the east side of Deep <br />Creek. <br />• Estimated flow of about 0.5 gallons per minute (gpm) is approximately the same volume as <br />was observed ]ast year. <br />• The flow is about only one-third to one-half the flow volume observed in 2000, when the <br />spring flowed down the east ATV track. <br />Location 8: <br />Deep Creek and the stock trail and ATV road crossing. <br />• The stream crossing is located above the eastern, mined-out part, of longwall Panel 17. <br />831-032.610 Wright Water Engineers, Inc. Page 21 <br />September 2003 <br />