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Climax Mine Closure Documentation <br />CAVR Asbestos Disposal Shaft January 15, 2016 <br />north, to shed water off of the cap. A brass monument was embedded in the concrete identifying the shaft <br />as an asbestos disposal site (Photo 6; Attachment 1). The corners of the building foundation were also <br />surveyed and have the following latitude / longitude coordinates and elevations: <br />Latitude Longitude Elevation (feet) <br />39-21-46.1531 106-10-23.0048 11,583.59 <br />39-21-46.0189 106-10-22.8566 11,583.53 <br />39-21-45.823 106-10-23.1426 11,583.58 <br />39-21-45.9600 106-10-23.2905 11,583.67 <br />Construction work was observed by Climax and Tetra Tech staff and a final inspection of the work was <br />performed by Tetra Tech on August 12, 2014, prior to concrete placement. All formwork and rebar <br />placement was observed to be in place as designed and specified. During concrete placement, field quality <br />control testing was performed including field testing of slump and entrained air. In addition, two sets of <br />four test cylinders were cast on-site to verify the compressive strength of the concrete. One cylinder, from <br />each set, was tested at seven days after placement, and three at twenty-eight days. The results of the field <br />quality control tests and compressive strength results are presented on the test reports provided in <br />Attachment 6. These results indicate the achievement of 28 -day compressive strengths in excess of 7,400 <br />psi, meeting the specified design strength of 6,000 psi. <br />Based on observations made during construction and documentation provided, the construction of the <br />CAVR concrete shaft cap has been completed in satisfaction of the requirements of the approved Closure <br />Plan. <br />Tetra Tech 3 <br />