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APPENDIX B <br />Detailed Work Plan and Benchmark Funding Schedule <br />#1 Send surface topography maps, tunnel long sections and any pertinent information to <br />design engineer for guidance on probable plug location and plug size. <br />#2 Advance $15,000 per portal. <br />Open portal (portals if multiple levels) for I yd LHD access, establish ventilation and any <br />other appropriate safety measures to secure portal and tunnel for selection of actual plug <br />site and collecting rock samples. Build sediment traps as needed to control sludge that <br />will be discharged. <br />#3 Close out #2 costs and advance $20,000. <br />Obtain Engineering design and submit to the Division of Minerals and Geology ("DMG") <br />and the Water Quality Control Division ("Divisioti') for approval. <br />#4 Establish coffer dam site, build coffer dam and divert water through piping. <br />#5 Close out #3 and #4 and advaz~ce $30,000. <br />Excavate plug azea to solid rock, remove all loose rock and clean back, ribs and sill to <br />remove mud, oxidation and other deposits to insure bonding of the concrete. Sand <br />blasting works. Confirm size and taper assumptions used for design. <br />#6 Construct forms and place rebaz. Arrange with DMG and the design engineer for pre-pour <br />inspection. Determine grout pattern targets, mark hole collars to miss rebar and record <br />drill angles and lengths to rock contact. <br />#7 Close out #5 and #6 and advance $10,000. <br />Place any alkaline material in the azea between bulkhead and coffer dam platmed for plug <br />protection. Setup for pour and pour. Sample concrete for 7 day and 28 day tests during <br />pour to confirm design strength has been met. <br />#8 Strip forms and drill holes for low pressure contact grouting. Grout holes until refusal. <br />#9 Close valve. Grout valve and close portal if permanent closure is selected by owner. <br />Submit construction certification report to DMG and the Division. Close out #7, #8 and <br />#9 and distribute Remaining Funds in accordance with the terms of this Agreement. <br />231115.2 December 3, 2002 B - 1 <br />