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<br />I. SURVEY DATA <br />The spatial locations of subsidence monuments that are <br />currently being monitored are tabulated in Appendix A. <br />II. MAPS <br />A. Plan View <br />The attached map (Drawing #FC-14-8501) shows a plan <br />view of existing underground workings (updated to July 1, <br />1965), one year mining projection, surface topography and <br />structures, and monument locations. <br />B. Cross Sections <br />The attached cross section (Drawing #FC-19-8402) <br />shows the three monuments installed in the location of <br />Foidel Creek. Underground development progressed beneath <br />these monuments in April, 1989. No cross sections are <br />included for the spoils stability monuments because only <br />• one monument is installed along the slope dip at each <br />location. <br />III. HYDROLOGY <br />The underground mine is dewatering the adjacent Wadge over- <br />burden aquifer and drawdown in the vicinity of the workings is <br />being monitored by existing wells in the aquifer. Alluvial wells <br />are being monitored above the workings in the Foidel Creek flood <br />plain. Water monitoring data will be included in the 1985 <br />Hydrologic Monitoring Report for Mining Permit C-056-82. <br />IV. STRUCTURES <br />Only development main entries have been mined to date, <br />hence no caving of overburden strata has taken place. There has <br />been no measurable subsidence of the monuments installed at Foidel <br />Creek. There has not been any monitoring of other structures <br />above the main entries. It is proposed to survey the three monu- <br />ments installed at Foidel Creek (FC-2, FC-3 and FC-9) annually in <br />• future, unless surface subsidence in their vicinity is observed <br />or more frequent surveying is requested by the CMLRD. <br />