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October 11, 2011 <br />Page 20 <br />• Appropriate personnel at mine and regulatory authorities,as well as the owners of the <br />water disposal pit, should be informed in case anomalies are observed that may indicate <br />an affected pit. <br />• The retreat plan should be re- evaluated to ensure that operations will not further damage <br />the water disposal pit in question. <br />4.7 Solar Panels /Scada Antennas <br />4.7.1 Solar Panels /Scada Antennas Subsidence Control Plan <br />Solar panels and Scada tower /antennas were classified as transmission towers that are <br />less than 50 meters (164 ft) tall. This is a very conservative assumption. Nonetheless, the <br />allowable horizontal strain for such structures is 7 millistrain, which according to the SDPS <br />subsidence prediction analysis is unlikely to be experienced. Hence, such structures may be fully <br />undermined with appropriate monitoring, as outlined below. <br />4.7.2 Solar Panels /Scada Antennas Monitoring Plan <br />To ensure that the control plan is effective, AAI recommends the following monitoring <br />plan: <br />• The solar panel and Scada tower owners should be informed as mining approaches and <br />data generated during monitoring should be shared with them. <br />• Visual monitoring of the towers should be performed weekly as long as the retreat line is <br />within a 10° vertical offset angle of the towers. Any appearance of tilt or change in <br />elevation of the towers should be noted. <br />• Structural anomalies reported by the surface owner(s) will be investigated. <br />4.7.3 Worst Possible Consequences of Damage to Solar Panels /Scada Antennas <br />Any damage to these structures would likely involve disruption of power, and/or <br />communication. <br />4.7.4 Solar Panels /Scada Antennas Damage Mitigation Plan <br />In case monitoring indicates onset of damage or potential for damage to the solar panels <br />or Scada tower /antennas, the following mitigation plan should be adopted. <br />• Appropriate personnel at mine and regulatory authorities, as well as the owners of the <br />towers /antennas, should be informed in case anomalies are observed that may indicate an <br />affected tower. <br />• The retreat plan should be re- evaluated to ensure that operations will not further damage <br />the tower in question. <br />Agapito Associates, Inc. <br />