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Appendix B - Packer Test Methods and Results 4 <br />step, the valve was kept open for 10-30 seconds. The water was captured, and the volume of water <br />bled from the system and the pressure drop were recorded. This was repeated until the pressure in <br />the interval was zero. <br />At any given interval, the entire test could take as little as 45 minutes, except in the very lowest <br />permeability materials, where two hours could be required. <br />• <br />• <br />W * - <br />I f <br />L <br />F` <br /> <br />- V p , ? <br />k 1 <br />4109B.071116 Whetstone Associates <br />Figure 3. Bleed-off Test Conducted in Underground Drill Hole