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<br /> <br />I. SURVEY DATA <br />The coordinate 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-14-8601) shows a plan view of <br />the existing underground workings (updated to January 1, 1987), <br />one year mining projections, surface topography and structures, <br />and subsidence monument locations. <br />B. Cross Section <br />The attached cross section (drawing #FC-14-8402 shows the <br />three monuments installed in the location of Foidel Creek. These <br />monuments are designated FC-2, FC-3, and FC-4. The attached cross <br />section (drawing #FC-14-8602) shows the surface subsidence <br />monuments installed to monitor surface movement associated with <br />underground mining of 1st Panel South. Note that this cross <br />section map is drawn showing each monument elevation referenced at <br />ground level equals zero. This allows a more useful vertical <br />scale to be used which will better illustrate the relative <br />subsidence. These monuments are designated SM-7 through SM-24 <br />(transverse section), and SM-19, SM-25 through SM-41 (longitudinal <br />section). Underground development continued to progress beneath <br />some of these monuments through December, 1986. No cross sections <br />are included for the spoils stability monuments because only one <br />monument is installed along the slope dip at each location. <br />III. HYDROGL(~' <br />The underground mine is dewatering the adjacent Wadge <br />overburden aquifer. Water monitoring data will be included in <br />the annual hydrology report. <br />IV. STRUCTURES <br />Coal production has occurred in 1st Main North, and 1st <br />Panel South. In 1st Panel South, partial extraction of <br />pillars began in February, 1986, and continued through June, 1986; <br />full pillar extraction began in July, 1986, and continued to Mid- <br />August, 1986; partial pillar extraction resumed again in <br />November, 19E6, and December, 1986. Several surface structures <br />associated with the underground section of 1st Panel South have <br />been surveyed. These structures are shown on drawing FC-14-8601 <br />and include two buried water tanks, CYCC office building, gas <br />storage tank, and power poles which are designated POLE-1 through <br />POLE-13. <br />• <br />