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I May 29, 2009 Page 4 <br />Horse Gulch Drilling <br /> <br />0.0 Defined as Rock-Soil Contact <br />80 <br /> <br />60 <br />Y <br />C <br />O <br />U <br /> <br />50 <br />3 <br /> <br />? <br />0 <br />m <br /> <br />39 <br />Above Bedrock Contact <br /> <br /> <br /> <br />? ? ? Below Bedrock Contact <br /> <br />-20 -15 -10 -5 0 5 10 <br />Distance to Contact (ft) <br />Figure 3. SPT Blow Count versus Bedrock Contact <br />2.3 K-Pit Spoils properties <br />During the April 2008 drilling program, ten borings were drilled into the G-Pit spoils in <br />the area of the proposed K-Pit Buttress Fill. The approximate locations are shown in Figure 4. <br />This area was also sampled using California Tubes driven with an SPT Hammer. Natural <br />moisture content, dry density and fines content were measured, and the dry densities were <br />compared to the Standard proctor for a composite sample of the drill holes. The results are <br />presented in Table 3. <br />The SPT blow count showed only modest stiffening with depth. The physical makeup of <br />the samples suggests that the upper portions of the spoil pile were either soil or easily weathered <br />mudstones or shales. <br />Numerous studies have been completed on the relationship between the types of materials <br />in the fill and the mechanical properties of the fill. Table 4 shows the results of the studies <br />prepared by Douglass and Bailey (1983). <br />1 Agapito Associates, Inc.