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Geotechnical Data Technical Memorandum <br />Hazeltine - Raad Runners Rest II Gravel Pit Lining Project <br />December 2000 <br />4.3.3 Hydraulic Conductivity <br />Back pressure permeability tests were performed in the laboratory on two intact samples <br />of sandstone bedrock. The results of the tests are provided in Appendix E and <br />summarized in Table 4.5. <br />TABLE 4.5 <br />Summary of Laboratory Back Pressure <br />Permeability Tests on Foundation Bedrock <br /> Measured <br /> Sample Hydraulic <br />Boring Depth Material Percent Conductivity <br />Number (ft) Description Fines (cm/sec) <br />B-109 66.5 - 67.0 Sandstone, mostly 11.1 3.0 X 10 ~ <br /> fine grained <br />B-116 48.0 - 48.5 Clayey sandstone, 47.8 1 X 10'' <br /> very fine to fine- <br /> grained <br /> <br /> <br /> <br />L <br /> <br /> <br /> <br /> <br /> <br />In general, packer permeability tests were conducted during drilling at one to four <br />locations in the bedrock portions of the borings. The length, number, and depth of the <br />test intervals varied based on the stratigraphy and specific characteristics of the bedrock <br />and bore hole. Each test interval was generally tested at pressures of about 50, 75 and <br />90 percent of estimated effective overburden pressure in five steps starting at 50 percent <br />stepping up to 90 percent then back down to 50 percent in two intervals. Increasing and <br />decreasing the test pressure provides information over a range of pressures and on the <br />behavior of the joints such as continuity of fractures and opening and closing relative to <br />changes in pressure. The results of the packer permeability tests are summarized in Table <br />4.6. Test information is also presented in Appendix B. <br />GEI Consulcanrs, Inc. 4-4 <br /> <br /> <br /> <br /> <br />98'ISgro ~m wpd <br />