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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 Page 5 <br />System. Appendix A also provides additional exploratory information in the general notes to the <br />logs. <br /> <br />4.4 GROUNDWATER CONDITIONS <br /> <br />We observed static groundwater in several of our subsurface explorations. In our previous fault <br />exploration, groundwater was encountered in several exploratory trenches. The following table <br />summarizes our groundwater observations in the recent exploratory borings: <br /> <br />Boring/ <br />Trench Location <br />Approximate Depth <br />to Groundwater (ft.)Approximate Groundwater Elevation (ft.) <br />1-B1 27.5 374.5 <br />1-B4 17.5 379.5 <br />B-1 30.0 363.0 <br />B-2 36.0 351.0 <br />HLA-2 9.0 363.0 <br /> <br />Fluctuations in the level of groundwater may occur due to variations in rainfall and other factors <br />not evident at the time measurements were made. <br /> <br />4.5 LABORATORY TESTING <br /> <br />We performed laboratory tests on selected soil samples to determine their engineering properties. <br />For this project, we performed unconfined compression, plasticity index, direct shear and soil <br />corrosion potential testing (pH and sulfates). Plasticity indexes are recorded on the boring logs <br />in Appendix A. All other laboratory data is included in Appendix B. <br />