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Santa Ana Bridge Rehabilitation and Bike Trail Structure 12/27/2004 • Soil corrosion potential TASK 1.7.4 - GEOLOGICISEISMIC INVESTIGATION A Certified Engineering Geologist (CEG) will lead the geologic/seismic investigation and will: • Review available published geologic/seismic reports pertinent to the project site. • Visit the site to identify geologic/seismic issues of concern. • Provide a discussion of relevant geologic/seismic issues. Results of recent investigations by Southern California Earthquake Center scientists and their consultants will be reviewed in our evaluation and incorporated into the development of site ground motion. TASK 1.7. 5 —FINAL FOUNDATION REPORTS The Final Foundation Report will be developed based on the existing LOTB and Engineering analysis described above. The final foundation report will include discussion of the soil conditions at the site, existing boring logs, soil classifications, groundwater level, and unusual conditions. We will also recommend an AIRS curve and seismic parameters using Caltrans California Seismic Hazard Map and ATC-32. All reports will be issued as draft for review and comments. Final reports will be issued after incorporating the review comments. DELIVERABLE: FINAL FOUNDATION REPORT (t STRUCTURE) 1.8. CONCEPT ALTERNATIVE STUDY For the bike path structure along the Santa Ana -Delhi Channel it is our understanding that the cantilever bike structure is the chosen structure type. DELIVERABLES: (Deleted) 1.9 BRIDGE GENERAL PLANS / STRUCTURE TYPE SELECTION The WKA Team will prepare the bridge general plans to reflect all the English, utility, foundation and bridge design changes. The general plan will follow Caltrans OSFP I&P Guide Section 4-2 "Structure Type Selection'. Bridge General Plans. The proposed bike path structure will span over or be constructed in the Santa Ana -Delhi Creek, which is a lined channel owned and maintained by Orange County Flood Control District. Channel hydrology and hydraulic will not be completed as it is anticipated that the structure will be above the existing high water elevation plus the minimum freeboard required The bridge type for McFadden Avenue and Fifth Street will include the study of widening by removing the existing overhang and constructing a new wider overhang to carry the girder. The existing outside girder will be checked with the increased weight of the new barrier. If necessary the girder will be strengthened to carry the additional load. For Flower Street Barrier Replacement, two alternatives will be studied. The barrier rehabilitation and replacement requires the outside sidewalk girder to be replaced and/or strengthened to carry the additional barrier weight as well as vehicular wheel loads and barrier crash loads. The first alternative will investigate strengthen the existing edge