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<br /> <br />17800 Newhope Street, Suite B, Fountain Valley, California 92708 Tel: (714) 751-3826 Fax: (714) 751-3928 <br /> <br /> <br /> <br /> <br /> <br /> <br />June 9, 2014 <br />EMI Project No. 12-109 <br />RBF Consulting <br />14725 Alton Parkway <br />Irvine, California 92618 <br /> <br />Attention: Mr. Bo Burick, P.E. <br /> <br />Subject: Preliminary Materials Report <br /> SR-57/Lambert Road Interchange Improvements <br /> Orange County, California <br /> 12-ORA-57, PM 20.1/21.8 <br /> Caltrans EA No. 12-0C1100 <br /> <br />Dear Mr. Burick: <br />Attached is the revised Preliminary Materials Report for the SR-57/Lambert Road Interchange <br />Improvement Project. Earlier versions of this report dated July 8, 2013 and May 5, 2014 were <br />submitted to Caltrans for review. Caltrans review comments and our responses are included in <br />Appendix B. <br />Conclusions and recommendations given in this report are based on available as-built subsurface <br />soil information. Conclusions and recommendations are considered preliminary and should be <br />verified in the future by conducting additional site-specific geotechnical field investigations, <br />laboratory soil testing, and analyses. <br />We appreciate the opportunity to provide geotechnical services for the project. If you have any <br />questions or require additional information please call us. <br /> <br />Sincerely, <br />EARTH MECHANICS, INC. <br /> <br /> <br /> <br />Lino Cheang, GE 2345 <br />Project Manager <br /> <br /> <br /> <br /> <br /> <br /> <br />