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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />March 31, 2008 6 <br />Trench T-2 <br /> <br />Colluvial soils ranging from about 8 to 9 feet thick were encountered over sandstone bedrock. <br />Bedding laminations in the sandstone were oriented N30W 20E. No shearing or other features <br />indicative of faulting were observed. <br /> <br />Trench T-3 <br /> <br />From Stations 0+00 to 0+15, colluvium ranging from about 11 to 12 feet thick was encountered, <br />overlying sandstone that was similar in appearance to the sandstone encountered in Trench T-2. <br />Toward the northeast, the thickness of the colluvial deposits decreased and from about <br />Stations 0+45 to 0+52, the colluvium had been removed by a cut slope associated with <br />Dublin Canyon Road. From Stations 0+15 to 0+52, interbedded siltstone and conglomerate were <br />exposed. Bedrock structure was mapped striking N40W to N55W and dipping 20 to 40 degrees to <br />the northeast. No shearing or other features indicative of faulting were observed. <br /> <br />Based on the findings of this exploration in conjunction with the findings of previous exploration at <br />the site, the attached Geologic Cross Sections A-A’ and B-B’ (Figure 5) were prepared showing our <br />interpretation of geologic conditions at the site. The cross sections also illustrate the overlap of the <br />exploratory trenches relative to the planned building footprint. <br />