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<br /> <br />US 85/Ft. Lupton Pi[ <br />Page 2 of 2 <br />friction angle (~) of 35 degrees for the sand and gravel will likely control the <br />temporary excavation geometry with a factor of safety of 1.0. <br />d. Additionally, it is important to make sure excess seepage forces will not occur along <br />the cut slope. As discussed with Mark Reiner at Civil Resources, it is understood it <br />will not be possible to incorporate seepage forces into the computer slope model, <br />however it was agreed an alternative would be to perform a standard analytical <br />seepage force determination. <br />Please contact this office at 303-757-9275 with any questions. <br />REVIEW: Hsing-Cheng Liu <br />COPY: Liu <br />