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•1 <br />RECEIVED <br />MAY 0 4 2005 <br />From: Vesely, Mark Oiuision ~f Minerals and Geology <br />Sent; Wednesday, April 13, 2005 7:50 AM <br />To: brad@civilresources.com; danna@civilresources.com <br />Cc: Liu, Hsing-Cheng; DeWitt, Gary <br />Subject: Ft. Lupton Pit <br />Brad and Danna, <br />Mark Reiner requested I send this to you to document our conversation from the other day. <br />Montlay morning we had a call from Mark Reiner at Civil Resources. He was looking for a <br />summary of the geotechnical comments on the slope model so Civil Resources can work towards <br />finalizing their work. As discussed during the site visit a few weeks ago and during the phone <br />call, our preference would be to run the temporary excavation analysis using a minimum factor of <br />safety of 1.35 in accordance with FHWA. Also, it is important to make sure excess seepage <br />forces will not occur along the cut slope. Given the modeling software, it is understood it will <br />probably not be possible to incorporate seepage forces into the model, however it was agreed <br />during the phone conversation an alternative would be to perform this analysis using a standard <br />analytical approach. Mark Reiner also indicated they would be analyzing from the fence line and <br />not the road edge. <br />Mark Vesely, P.E. <br />Materials and Geotechnical Branch <br />Colorado Department of Transportation <br />4201 E. Arkansas Ave. <br />Denver, CO 80222 <br />ph: 303-757-9275 <br />Permit #: ~ Confidental?: <br />Class: Type-S <br />From: ,,99.~ ~~To: ~rIG <br />Doc. Name: / r ~ Sp.Yt 0 , <br />Doc. Date (if no date sta p): 5•~f-0.S 9 <br />