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! <br />~ SECTIONTHREE <br />BacKground tnformation <br />appeared the 2003 Study tested bedrock shale and found it to have a moisture content of 14.4%, <br />very similax to the current tested sample. <br />Appendix F presents gradation summaries (Figure 3), percent fines with depth (Figure 4), water <br />content with depth (Figure 5); and dry unit weight with depth laboratory results (Figure b) from <br />URS' and Srnith's investigations. <br />3.7.2 Engineering Properties Testing <br />Isotropically consolidated-undrained triaaiial compression tests (CIU') with pore pressure <br />measurements were performed to measure the effective and total stress friction angles and the <br />undrained strength characteristics of the common embankment clay and the isolated weaker clay <br />found in DH3 and DH4. <br />One CIU' envelope was developed using three representative embankment clay samples with <br />similar physical characteristics and relative densities as measured in the field. Another CIU' <br />envelope was created using a composite remolded sample from the weaker clay. The remolded <br />sample was prepared using a slurry-sediment procedure. Results from the CIU' envelopes are <br />provided in Appendiat F. <br />3.8 SITE SURVEY <br />A site survey which was used for the base mapping for this study was prepared by Tetra-Tech <br />RMC on June 7, 2006. The elevations were based on NAVD 88. <br />~,~,,~ 3-9 <br />