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<br />BIGGS CARDOSA <br />ASSOCIATES INC <br />STRUCTURAL ENGINEERS <br /> <br />EXHIBIT -A: <br /> <br />ElSEl The Alameda <br />San .Jose, CA 95126-3133 <br />Telephone 408-288-5515 <br />Facsimile 408-288-81 14 <br /> <br />February 26,2010 <br /> <br />City of Redwood City <br />Building, Infrastructure and Transportation Department <br />1400 Broadway <br />Redwood City, Ca. 94063 <br /> <br />Attention: <br /> <br />Harris Siddiqui <br /> <br />Subject: <br /> <br />Structural Engineering Proposal for Replacement of: <br />Existing Redwood Creek Channel at 160511609 Redwood Avenue <br /> <br />Dear Harris: <br /> <br />Biggs Cardosa Associates, Inc. is pleased to submit the following proposal to provide structural <br />engineering services on the subject project. In general, the structural work will consists of the <br />following: <br />. Task 1: Conduct a field review and assessment of the existing 200-foot long engineered <br />channel located along Redwood Creek between Valota Road and Sierra Street and prepare <br />Type Selection recommendations for the existing channel replacement! rehabilitation. <br />· Task 2: Prepare plans, specifications and estimates for the existing channel replacement! <br />rehabilitation <br /> <br />Per our discussions, the existing channel was constructed in the 1960s and consists of a concrete <br />invert slab, ......8-foot high sack concrete slope protection along the south bank, and .....8-foot high <br />concrete lining along the north bank.. It is our understanding from the City that the existing south <br />bank is in relatively good condition and that the north bank has exhibited signs of distress <br />including significant inward rotation of the concrete lining> washout of material from the existing <br />weepholes and loss of backfill material from behind the wall. Per our review of the City supplied <br />field photos, it appears that the existing concrete wall will likely require replacement (rather than <br />rehabilitation) due to the significant rotation of the wall towards the creek. <br /> <br />Scope oj Work <br /> <br />Task 1: Field Review and Tvoe Selection: <br />· Review available project data. Data for review will include, but not necessarily be limited to: <br />o As-built Record Drawings <br />o Maintenance Reports <br />o Photographic Records <br />o Previous field measurements <br />o City base mapping <br /> <br />-~~ <br />-.:iiiI__I, <br />