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APPENDIX D <br />• March 2000 -17- 993-2099.150 <br />The mined slots will be remediated by backfilling the excavation with either Coarse Shaft <br />Backfill, Select Structural Fill, or Structural Fill. After backfill, the slot will be capped <br />with geogrid to minimize settlement under the VLF load. <br />5.4 Remediation of Areas Influenced by Underground Workings <br />The areas requiring remediation to account for the presence of underground workings and <br />surface disturbances created by underground mining are shown in Drawing Nos. 7 and 8. <br />Each of the areas to be remediated or areas where remediation may be required following <br />further investigation are discussed in the following sections. <br />There is minor encroachment of underground workings in this area from mining activities <br />is undertaken from Thompson and Elkton Shafts. Although precise elevation for these <br />workings have not been determined, the limited level information that is available suggests <br />that these workings are more than 100 feet below. The drilling undertaken to date has not <br />indicated any underground workings sufficiently close to surface to require remediation. <br />Additional exploratory drilling will be undertaken at the time of remediation to confirm the <br />depth to workings. <br />This is the area of St. John Bostwich Shaft. One of the holes drilled in the area identified <br />an open excavation at a depth of approximately 80 feet below surface, but no shallower <br />workings at this location. Further exploratory drilling will be undertaken in this area at <br />the time of remediation, and if this confirms that workings shallower than this are not <br />present, no remediation will be undertaken in the area. <br />L?] <br />1:19411 MFINAL AEPORt1MAPPD.DW Golder Associates