Laserfiche WebLink
SubTerra, Inc. Twentymile Coal Company 6/1912003 <br />19-Right Power Line Study <br />• 5. Conclusions and Recommendations <br />Several conclusions can be drawn from the preliminary work, including: <br />1. Structures on the Archer-Hayden line are predicted to subside by up to 4-ft. <br />2. Structures on the Craig-Hayden-Steamboat line are predicted to subside by less than 3-ft <br />3. Maximum daily subsidence is predicted to be less than 8-inches per day. <br />4. The duration of subsidence effects at each structure is expected to be less than 25-days. <br />5. The length of the traveling subsidence profile means that each structure will react <br />independently, which should for the most part, eliminate the potential for complex <br />interactions. <br />6. Subsidence, tilt and strain magnitude at each structure are predicted to be lower than <br />already experienced by WAPA's line that crosses the Eastern Mining District. <br />We recommend that a detailed monitoring program be developed in consultation with the Power <br />Company engineers and included in the Final Draft of this report. <br /> <br />• <br />4 <br />