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2.05.6(6) <br />Subsidence Monitoring <br />Monument <br />Location <br />Frequency <br />Purpose <br />To measure subsidence if any along the <br />Aqueduct & <br />Pitkin Mesa Pipe Line & Stevens Gulch <br />PL -08 to PL -29 <br />Stevens Gulch <br />Quarterly <br />Road. Monitoring to Begin One Year <br />Road <br />Before Longwall Mining in the Area <br />Monitoring Suspended 04/2018. <br />The Operator's <br />To measure subsidence if any to The <br />43-A, B & C <br />Three Cabins <br />Optional <br />Operator's Cabins. <br />To measure subsidence, if any, on <br />Stevens Gulch Road. Monitoring to Begin <br />SG -1 to SG -14 <br />Stevens Gulch <br />Quarterly <br />One Year Before Longwall Mining in the <br />Road <br />Area. No longwall mining occurred <br />under these monuments. <br />To confirm/refine the subsidence <br />predictions for the area. Longwall <br />mining projected 2016/2017. The <br />WT -1 thru 10 <br />initial survey will be conducted and <br />& <br />West Fork of <br />Semi- <br />the data submitted to the Division at <br />WT -11 thru 17 <br />Terror Creek <br />Annual <br />least six months prior to longwall <br />mining beneath the area, and semi- <br />annually thereafter. <br />No longwall mining occurred in this <br />area. <br />To be <br />Longwall Panels <br />Verify the maximum subsidence <br />within the Spruce <br />Quarterly <br />prediction. <br />determined <br />Stomp Lease <br />Verify the predicted change in slope of <br />West Terror Creek using Lidar aerial <br />surveying. First survey will be <br />West Terror <br />performed after longwall mining is <br />None <br />Creek Flow Line <br />2 Times <br />complete under the creek. Second <br />survey will be performed two years <br />after longwall mining is complete under <br />the creek. No longwall mining occurred <br />under the West Fork of Terror Creek. <br />TRA 16 2.05-178- 04/18 <br />