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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 <br />FIELD EXPLORATION NOTES <br /> <br />We drilled four borings on the site for this report. An ENGEO representative supervised the <br />drilling, and logged the subsurface conditions. A B24 drill rig was used to drill the borings using <br />solid flight auger methods. <br /> <br />The boring logs present descriptions and graphically depict the subsurface soil, rock and <br />groundwater conditions encountered. The maximum depth penetrated by the borings was 28.5 <br />feet. <br /> <br />We obtained bulk soil samples from drill cuttings. We retrieved both disturbed and relatively <br />undisturbed soil samples at various intervals in the borings using 2-1/2 inch O.D. split spoon <br />sampler. <br /> <br />The standard penetration resistance blow counts were obtained by dropping a 140-pound <br />hammer through a 30-inch free fall. We also retrieved soil samples at various intervals in the <br />borings using Standard Penetration Tests (SPT) and a Modified California Sampler (3-inch O.D. <br />split spoon sampler with thin walled liners). Unless otherwise indicated, the blows per foot <br />recorded on the boring log represent the accumulated number of blows required to drive the last <br />12 inches. <br /> <br />NOTES TO THE LOGS <br /> <br />We determined the lines designating the interface between soil/rock materials on the logs using <br />visual observations. The transition between the materials may be abrupt or gradual. <br />