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a. Secondary containment — stored in an underground chamber that does not drain <br />to the surface. The drum will also be placed on a steel pallet with self containment <br />for 110% of the full amount of the drum. <br />3. 55 gallon engine oil drum located in the underground storage tunnel. <br />a. Secondary containment — stored in an underground chamber that does not drain <br />to the surface. The drum will also be placed on a steel pallet with self containment <br />for 110% of the full amount of the drum. <br />Additional chemicals will be stored underground in the Mill Tunnel for use in the processing of <br />the ore. The handling, storage and disposal of these chemicals is addressed in Exhibit T and <br />Material Containment Plan of Appendix 10. <br />11. Mine Equipment Storage and Surface Shop Building <br />The mine equipment storage and shop will be a 150' x 50' structure located on the east end of <br />the upper bench of the Revenue surface facilities area. It will be constructed on a 6" reinforced <br />concrete foundation. Large surface equipment will be stored and serviced in this structure. The <br />primary storage facility for underground equipment will be the underground storage facilities <br />immediately west of the mill. Both of these storage and maintenance facilities can be found on <br />Map C -4. <br />12. Personnel Facilities and Compressor Building <br />There will be two personnel facilities as part of the Revenue Mine. The first is the mine office <br />and lunch room located just outside the portal. The mine track from the Revenue portal goes <br />through this building. It is a roughly 70' x 40' wood and steel structure on a 6 -inch concrete <br />foundation. The second facility is the set of portable dry -room trailers north of the portal. These <br />trailers area each 40' x 10', and do not have a foundation. The trailers are covered with a braced <br />corrugated metal structure for protection. The covering is in poor condition, and will be removed <br />early in the mine's operation. Also, a 6 -inch concrete foundation will be installed at the trailer <br />Revenue Mine August 2012 D -18 <br />