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EXHIBff W. KOO & Associates, Inc. Structural Engineers September 30, 1998 Mr. James G. Ross City of Santa Aha Public Works Agency 101 W. Fourth Street, 4th Floor Santa Ana, CA 92701 RE: Seismic Retrofit Design of City of Santa Aha Bridges Dear Mr. Ross: W. Koo & Associates (WKA) is pleased to present the enclosed fee proposal for the performance of the entire scope of work for the referenced project as described in the City's RFP dated September 9, 1998, and addendum One dated September 23, 1998. We have carefully reviewed the Statement of Work as contained in the RFP, and have made reasonable effort to estimate the amount of work that will be required to prepare a complete and biddable contract document that consists of plans, specification and estimates (PS&E) to retrofit these three critical bridges. However, it is necessary to make a number of assumptions based on our understanding of the project and the reasonably expected level of effort which is derived from our past experiences on similar projects. These assumptions are summarized below: Permit Processing - The PS&E will be processed through the Orange County Public Facilities and Resources Department (PF&RD), the U.S. Army Corps of Engineers (USACOE) for approval. In addition, a permit will be needed from the Regional Water Quality Board due to excavation and de- watering within the river bed. No regulatory permitting CUSACOE 404 or U.S. Department of Fish and Game 1601) is anticipated since this is a lined channel and no modifications will be made to the lined river bed. Processing with the USACOE will not require new hydraulic since the proposed retrofit (and anticipated modifieatinns) will not alter the hydraulic flow area. The primary issue with PF&RD is anticipated to be the potential closure or temporary detour of the Santa Ama River bike trail. Survey -Survey service is typically not required for a seismic retrofit projects when adequate record drawings of the bridge and street/channel improvements are available. It is assumed that any necessary survey information would be provided by the City. The project team has survey capabilities which can be provided on a time and material basis. Utility Research/Coordination -Utility research will be limited to contacting known utilities in the area of each bridge and requesting information regarding their facilities in the vicinity. Identified utilities will be shown on the Foundation Plans for each bridge. _Plans will be forwarded to each utility agency for verification that their facilities are shown correctly. Preparation of utility relocation is not anticipated at this time, and the costs are not included in this fee proposal. It is assumed that any facilities which may require relocation will be handled by the owner. Known facilities at this time are: 600 The City Parkway West, Suite 310 · Orange, CA 92868 · Tel 714.456.0280 · Fax 714.456.0295