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& ENVIRONMENTAL SERA <br />3.0 Construction <br />3.1 Preparation and Forming <br />MES performed the stripout of piping and electrical utilities in Steve level, in the <br />vicinity of the bulkhead. The additional task of assisting in the removal of certain <br />items of mining equipment, old explosives, and other items prior to the closure of <br />the adits was also performed. MES then secured the top of the Sunshine winze <br />on the Steve level with chain link mesh for the safety of persons who might be <br />going down the Sunshine decline from the surface. <br />Probe hole drilling was conducted in the Pierce to validate the integrity of the sill <br />pillar prior to bulkhead construction (see Drawing sheet 6). <br />Preparation of the bulkhead locations included thorough scaling, excavating the <br />adit floor to bare rock, and cleaning all the rock surfaces with water and <br />compressed air for a good bond with the concrete. <br />Forms were constructed of horizontal 2" x 4" laminae, with vertical waters of <br />laminated 2" x 10" timber, backed up by horizontal waters of 4" x 13 #/ ft or 6" x <br />20 #/ft wide flange steel beams, secured by 6"x 4" x 1/2" angle iron brackets <br />anchored into the rock by resin-grouted #8 Williams rockbolts. The formwork <br />specification, typical formwork loads and construction details are under Tab 8. <br />• <br />• <br />Figure 6: Steve adit bulkhead forms, showing contact grout pipes, concrete <br />injection line, and additional pipes for remote shaft water monitoring (above) <br />