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KS Updated 05/27/03 <br /> The failure to do this can lead to excessive splashing of the product on personnel, <br /> equipment, and the ground surface. <br /> 20. If HRC--XTM continues to "surface" after the drive rods have been completely <br /> removed from the borehole a plug may need to be used. Large diameter <br /> disposable tips or wood stakes have been used successfully for this purpose. <br /> 21. Drive rods should be disconnected after one rod (typically four—feet) has been <br /> withdrawn. 'The drive rods should be placed in a bucket (or equivalent) after they <br /> have been disconnected. More often than not some residual HRC-XTM will <br /> remain in the drive rods and the bucket can be used to collect this residual <br /> material. The collected material should be poured back into the pump hopper <br /> periodically. <br /> 22. Install HRC-.XTM at the designated application rate across the entire targeted <br /> vertical interval. <br /> 23. After the injection is complete, an appropriate seal should be installed above the <br /> vertical interval where the HRC-XTM has been placed to prevent contaminant <br /> migration. Typically bentonite powder or chips are used to create this seal. <br /> However, consultants should review local regulations before beginning field <br /> installation activities to confirm that this approach can be used. <br /> 24. Complete;the borehole at the surface as appropriate using concrete or asphalt. <br /> 25. Repeat steps 12 through 24 until the entire application has been completed. <br /> HELPFUL HINTS <br /> A. Applications in Cold Weather Settings <br /> As discussed previously the viscosity of HRC-XTM is directly related to ambient <br /> temperature conditions. To maintain the temperature of HRC-XTM you can: <br /> o Keep the temperature of the product at or above 110 °F (43 °C) before <br /> pouring it into the pump hopper <br /> o Insulate the hose(s) used to deliver the material from the pump to the drive <br /> rods <br /> o Place -the pump and hot water bath used to heat the product inside a <br /> building or equivalent structure (e.g. cargo van) <br /> o Periodically check the temperature of the product in the pump hopper <br /> o Occasionally re-circulate the product through the pump and hose to <br /> maintain temperature and viscosity <br /> o The volume of product re-circulated should not exceed the quantity of <br /> material in the pump hopper <br /> J:ATechnical Services\Installation Instructions\HRC\HRC-X <br />