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SUNOL BOULEVARD/I-680 IMPROVEMENTS PA&FD 6. Accelerated Bridge Construction (ABC) Questionnaire 7. Risk Assessment Form An APS Construction Cost Estimate will be developed by estimating quantities for major items of work and assigning prices to each item. A contingency factor of 25% and mobilization factor of 10%of the total of the items cost will be added to the estimate. This proposal assumes one(1) draft submittal for review and comment,and one(1) final submittal. The final submittal will include one(1)hard copy of the plans and estimate and a CD containing the electronic files of the Microstation drawings and estimate. Subtask 5.8-Preliminary Geotechnical Report. Site visits will be performed and available data will be reviewed, including geotechnical data developed for the Project. Possible geotechnical/geologic impacts and mitigation measures will be discussed on a broad basis including but not limited to slope stability, geology, seismic impacts and risk,erosion, groundwater conditions, etc. for proposed bridge widenings,retaining walls, cuts and embankments. Generally, the geotechnical issues relevant to the project will be presented in a qualitative manner with no specific design recommendations. Potential mitigation measures will also be provided in a discussion format. All of this will be incorporated into a Preliminary Geotechnical Report. Structure Preliminary Geotechnical Reports(SPGR)will be prepared for the bridge widen and retaining walls in accordance with Caltrans standards, to support the APS submittals. It is expected that up to four SPGRs will be required: one for the on-ramp bridge, one for retaining walls at the existing railroad bridge, one for retaining walls at the Pleasanton- Sunol UC, and one for retaining walls along Sunol Boulevard. Fieldwork will be limited to a site visit by the Geotechnical Engineer and a site visit by the Certified Engineering Geologist. The SPGRs will provide an overview of the existing foundations, site geology, seismicity,and,if possible,recommendations regarding suitable and unsuitable foundation types. If appropriate, the SPGR will also discuss the anticipated field and laboratory work required to support the future Preliminary Foundation Reports and the future Foundation Reports. Other efforts include providing a preliminary pavement recommendations memorandum based on an assumed subgrade R-value and design traffic index provided by others to support the Life-Cycle Cost Analysis(LCCA),and other input on the alternatives regarding excavations, fill slopes, retaining walls, and possible mitigation measures for settlement and liquefaction issues that can be expected. Subtask 5.9—Construction Cost Estimate and Schedule. CONSULTANT will prepare a Project Report Level Cost Estimate and Schedule, in accordance with Caltrans requirements. Major construction items, quantities,unit prices, and soft costs will be identified to estimate total project costs including allowances for mobilization and contingencies (appropriate for this level of design detail). Cost variants for alternatives will be estimated, if necessary. Right-of-way and utility relocation costs will be approximated at this stage of design using available information. April 10,2020 21