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Earth Mechanics, Inc. <br /> Geotechnical & Earthquake Engineering <br /> <br />March 24, 2003 <br /> <br />W. Koo & Associates <br />600 The City Parkway West, Suite 310 <br />Orange, CA 92868 <br /> <br />EM1 Proposal No. P02-027 <br /> <br />Attention: Mr. Wei Koo <br /> <br />Subject: Cost Estimate for Fairview Street Bridge over Santa Ana River (Revised) <br /> <br />Dear Mr. Koo: <br /> <br />Per your request, Earth Mechanics, Inc. (EMI) has prepared a scope of work to provide <br />geotechnical consulting services for the Fairview Street Bridge retrofit project. We had provided <br />a scope of work and cost estimate on April 23, 2002. The current proposal is prepared to update <br />the scope of work and the cost estimate. <br /> <br />It is our understanding that Caltrans conducted the original retrofit design over 10 years ago and <br />WKA will check validity of the design to conform with current design codes. There is no <br />geotechnical report available from the earlier Caltrans' design. <br /> <br />This bridge is supported on eight piers and two abutments. All foundations are supported on <br />piles. We propose two phases that include the following scopes of works <br /> <br />1. Preliminary Design Phase <br /> <br />Search Additional Soil Data: The existing Log-of-Test-Boring (LOTB) shows three soil <br />borings; all drilled within the Santa Ana river channel. No soil data is available from the <br />embankment. We will search for additional soil data specifically from the U.S. Army <br />Corp of Engineering during the river improvement program. <br /> <br />Development of ARS Curve: EMI will study the seismic hazards at the site and <br />recommend an ARS design curve appropriate for the site which is consistent with <br />Caltrans latest guideline. <br /> <br />Evaluation of Liquefaction Potential: EM1 will evaluate liquefaction potential of the <br />foundation soil. Effects on the foundation as a result of soil liquefaction will be <br />addressed. <br /> <br />17660 Ncwhopc Street, Suite E, Fountain Valley, Calit'ornia 92708 Tel: (714) 751-3826 Fax: (714) 751-3928 <br /> <br /> <br />