FYI - we now have the slope analysis from Geotel. Thanks, ________________________________ From: Wei Zhang To: 'Bruce Dunne' ; 'Christiansen, Eric' Cc: Eric T. Little Sent: Fri Apr 16 13:31:35 2010 Subject: RE: Vitruvian Park - Section at Ponte Eric, We have performed global slope stability analyses on the section you provided. We assume that select fills you planned to be placed behind the retaining walls of about 16 feet high has a strength of 200 psf in cohesion and 28 degrees in friction. The select fill should be properly compacted to a 95% of the maximum density in accordance with the standard proctor. The underlying natural soils exhibited a long term strength of 300 psf in cohesion and 11.5 degrees in friction from a direct shear test. Based on our computer analyses, the section you provided has a minimum of factor of safety of 1.31. A greater factor of safety could be obtained by improving backfill strengths behind the walls. A formal report will be issued sometime next week. Let me know if you have any questions. Wei (Maxwell) Zhang, P.E. Geotel Engineering, Inc. 214-317-2950 ________________________________ From: Bruce Dunne [mailto:bdunne@icon-engineers.com] Sent: Friday, April 16, 2010 9:21 AM To: Christiansen, Eric; Wei Zhang Cc: Eric Little Subject: RE: Vitruvian Park - Section at Ponte Your interpretation of the proposed grading at Ponte Avenue Bridge is acceptable. ________________________________ From: Christiansen, Eric [mailto:echristiansen@halff.com] Sent: Thursday, April 15, 2010 5:30 PM To: Maxwell Zhang Cc: Bruce Dunne; Eric Little Subject: Vitruvian Park - Section at Ponte Importance: High Maxwell, As we just discussed on the phone, please consider the attached document as Halff's interpretation of the cross-section at the Ponte Avenue Bridge within Vitruvian Park. Since Icon graded the site, we have forwarded this document to Bruce Dunne for his approval and expect he will do so quickly. Once he has approved the document, you should be free to run your global stability analysis at Ponte. Should you still need additional information at Ponte, please let us know. If this is acceptable, let us know and we'll send you similar sections at Bella and the Southern Pedestrian Bridge. Thank you! Eric Christiansen Eric S. Christiansen, P.E., SECB, LEED AP Senior Structural Engineer HALFF ASSOCIATES, INC. 1201 North Bowser Road Richardson, Texas 75081 Phone 214-346-6284 Fax 214-739-0095 Cell 972-955-2996 www.halff.com