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• In reference to the Longwall area, a subsidence monitoring network will be installed over the firs[ panel to <br />provide data on the angle of draw and maximum subsidence. The location of [he proposed monuments are <br />shown on Map 23A, Five Year Mine Plan; typical monwnent construction is provided on Figure 14. <br />The monuments will be spaced approximately 100 fee[ apart, except [hat the spacing will be narrowed [o <br />50 feet at selected areas to better define the angle of draw. Also, monuments will he installed over pillars <br />in the gate entries. <br />In order to monitor subsidence and potential related effects due to extension of Panels 5 and G under the <br />designated Fish Creek AVF, three additional lines of subsidence monuments will be established as shown <br />on Map 23A, Five Year Mine Plan. A transverse line established perpendicular to the axis of Panels 5 and <br />6 will monitor both progressive and cumulative subsidence due to Panels 5 and G extraction. "fwo short <br />parallel lines established along the panel axis, will monitor start profiles for Panels 5 and 6 respectively. <br />Monuments will be located at approximately 100 foot intervals for AVF subsidence monitoring. <br />'fCC may install additional monuments [o provide infonna[ion pertinent to mine planning. The data <br />generated by the additional monitoring will not be included with the subsidence reports. <br />3. County Road No. 27 and D.G.W. Railroad Spur <br />The structures will be visually inspected on a weekly basis during active mining of production areas <br />adjacent to them. <br />4. Yamua Valley Electric Association 69KV Powerline <br />• As discussed in section 2.05.6(6) no production panels are planned to undermine the powerlines traversing <br />the Twentymile Park in [he five-year mine plan; also, since the powerlines do not lie within the widest <br />possible angle of draw, no monitoring of powerline structures will be performed. <br />5. Archaeological Site SRT345 <br />These features will not be disturbed. Tltey fall beyond the angle of draw. <br />The subsidence monuments will be constructed to withstand normal outdoor weather conditions. Atypical <br />monument is shown in Figure 14, Typical Subsidence Monument. <br />All monuments will he installed prior to secondary mining in a particular location. Monuments will be surveyed <br />quarterly, with @te exception of AVF subsidence monuments which will be surveyed +veekly for nvo months after <br />panel start. Severe winter conditions may preclude surveying monuments in hazardous or inaccessible areas. <br />Also, site specific conditions, such as holidays, may preclude compliance with this schedule. These conditions <br />will be discussed with the Division so that all parties agree the schedule can be modified. <br />TCC no longer plans to monitor monuments SP-2, SP-3, and SP-4. However, the monuments will be left intact <br />for further use, if necessary. <br />Subsidence reports +vill be submitted to the CMLRD semi-annually. The reports +vill be submitted 60 days after <br />the end of the perod, unless TCC contacts dte Division and requests an extension of the submittal date. The <br />• planned reporting format is sho++•n in Exhibit 34, Subsidence Survey Report. <br />M R 97- I i4 2.05-186 9/9/97 <br />