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K9 Updated 05/27/03 <br /> 11. Prior to connecting the hose to the sub-assembly a volume check should be <br /> completed to determine the volume and weight of product displaced with each <br /> pump stroke (see Table 1). <br /> Table 1 —Volume Check Information <br /> Volume of HRC- Number of pump Density of HRC- Mass of HRC-XTM <br /> XTM pumped strokes required XTM per pump stroke <br /> F7 3.0 gal 14 10.8 lbs/gal 2.3 lbs <br /> 3.0 gal 10 10.8 lbs/gal 3.2 lbs <br /> 12. After the drive rods have been pushed to the correct depth the assembly should be <br /> withdrawn three-to six-inches so that the disposable tip has room to be dropped. <br /> 13. Fill the annular space of the drive rods with water. This will minimize the amount <br /> of air introduced to the system. <br /> 14. Connect the hose from the grout pump to the drive rod assembly <br /> 15. Start pumping;the HRC-XTM product <br /> 16. The initial volume of HRC-XTM pumped should only be enough to displace the <br /> water within the drive rods. Once this is done the actual injection can start. <br /> 17. Begin withdrawing the drive rods, in accordance with the manufacturer's SOP, <br /> and start pumping the HRC-XTM simultaneously. The withdrawal rate should be <br /> such that it allows the appropriate quantity of material to be injected into each <br /> vertical foot of aquifer being treated. The withdrawal rate should be slow. If the <br /> drive rods are withdrawn too quickly a vacuum can be created and pull the <br /> product to the surface. <br /> 18. Depending on site-specific conditions, a different approach may need to be used. <br /> Less permeable soils such as clays and silts may have difficulty accepting the <br /> volume of material being installed. In this case Regenesis recommends using a <br /> "step-wise" application approach. For this approach we suggest withdrawing the <br /> drive rods in one-foot increments and then injecting the quantity of material <br /> required per foot. <br /> 19. Look for any indications of aquifer refusal such as: <br /> o Excessive pump noise such as squealing <br /> o Surfacing of material through the injection point (typically called <br /> "blow-by") <br /> If acceptance appears to be an issue it is critical that the aquifer is given enough <br /> time to equilibrate before breaking down the drive rods and/or removing the hose. <br /> J:ATechnical Services'dnstallation lnstructions\HRC\HRCA <br />