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PHILLIPS MINING, GEOTECHNICAL 8 GROUTING, INC. <br />The contractor will be responsible for mixing and testing the necessary trial batches to <br />ensure that the requisite properties can be consistently achieved. The concrete mix design <br />must be approved by the Engineer prior to its use. <br />Concrete testing requirements on site. <br />• Unconfined compressive strength; take three 6 inch diameter, 12 inch long cylinders <br />from every second truck or part of second truck. Perform 7, 14 and 28 day tests. <br />• Slump; take one test at the start of each truck, and one after each modification to the <br />mix, and every 0.5 hours throughout the pour. <br />6. PLUG GROUTING <br />An integral part of the successful installation of this underground plug will be the means <br />by which leakage around the plug is minimized. To achieve this, grouting will have to be <br />carried out. Grouting should not commence sooner than 28 days after the completion of <br />each section of concrete plug to allow the concrete in each placement to gain strength, <br />cool and generally stabilize. <br />Grouting of each plug section is required to seal the contact zone between the concrete <br />and rock and to create good structural contact between the two. Grouting will also be <br />required for a few feet into the rock around the plug to fill any open partings, fractures, <br />etc., to prevent water from bypassing the plug through the adjacent rock. The grouting <br />will be performed from the dry end of the completed plug. The extent of the grouting <br />performed will depend upon the conditions found during the grout hole drilling around the <br />plug. Atypical grout hole layout is shown in Figure 2. <br />Page 8 <br />