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PHILLIPS MINING, GEOTECHNICAL & GROUTING, INC. <br />with water:cement ratios down to 0.7:1 by weight, at a rate of at least 15 gpm at 100 psi. <br />The mixing and holding tanks must be sized to adequately supply the pump at its <br />maximum pumping rate. <br />7. SUMMARY <br />The completed plug must be a competent unit that is capable of withstanding the applied <br />hydrostatic head with the minimum of leakage. To achieve this goal, particular care must <br />be taken in the construction, especially in the following areas; <br />• there must be no uncontrolled water entering the plug construction area, especially <br />during the concrete placement; <br />• a very thorough final cleanup of the rock surface of the plug must be performed to <br />remove all the loose material, prior to the placement of the concrete; <br />• there must be adequate preparation for the concrete pours, including the provision <br />of a suitable concrete mix design and the necessary back up equipment and/or <br />spare parts, to ensure that the work can be completed without a major delay; <br />• the grout pipes must be carefully and accurately located; <br />• the gouting of the holes must be appropriately sequenced and the choice of either <br />Terracem or Ultracem cement grouts, or equivalent, must be compatible with the <br />conditions encountered in each grout stage in each hole. <br />Page 10 <br />