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Pre-pour Inspection 2 June 30, 1997 <br /> Ransom Portal Inspection Date 6/16/97 <br /> SGC Mine Remediation Project DMG File M-77-378 <br /> air side form. Forms were well braced with 2.5" drill pipe. Drill pipes were secured to <br /> angle iron, angle iron were bolted to resin bolts. <br /> Distance between interior form faces was 8'1 ". Temperature and shrinkage rebar cage <br /> was constructed of #6 rebar (6/8" diameter) on 18" centers. Structural rebar cage was <br /> constructed of #10 rebar (10/8" diameter) on 8" centers. Rebar cages were spliced to <br /> resin bolts. Rebar members of cages were continuous, splice were observed only to resin <br /> bolt anchors. Horizontal and vertical rebar members were secured to one-another by wire <br /> wrap at intersections. Rebar cages were spaced 3.5" from interior face of concrete <br /> forms, no rebar or splice wires were observed in contact with face of concrete forms. <br /> Tunnel dimensions at bulkhead location was approximately 10'x 10'. <br /> Location of rebar were recorded on face of air side concrete form to ensure grout drilling <br /> not encounter rebar. Operator stated that approximately 7 days following pour, concrete <br /> has cured sufficiently to allow drilling grout holes through face of bulkhead to bulkhead <br /> contact with parent rock. Grout is then pumped to a minimum of 200 psi to ensure <br /> adequate seal. Approximately 15 grout holes were marked. <br /> (end of report) <br /> cc: Allen Sorenson, DMG <br /> Sarah Johnson, CDPHE WQCD <br />