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our subconsultant, using the high air pressure method to minimize potential damage to existing utilities. It is assumed that approximately 10 potholes will be required. 1.9 Geotechnical A combined Geotechnical Design Report and Materials Report will be prepared and submitted to District 4, and a Foundation Report for the new bridge will be prepared and submitted to Caltrans Division of Structures (DOS). The work will include review of readily available existing soiVgeology literature in the project area, subsurface exploration, soil sampling, laboratory testing, design recommendations, report preparation, and design review/consultation. Generally Caltrans requires a Materials Report (pavement and corrosion studies) and a separate Geotechnical Design Report (structures and embankments) for their projects. In our past projects with Caltrans District 4, when there are minor structures included in a roadway embankment construction, we have been able to successfully agree to submit one combined report to save costs and time required for reviews. Therefore, we have assumed that a combined report will be acceptable to Caltrans. a) Geotechnical Design and Materials Report (Combined) . Research and Data Collection: Review of readily available published geologic and soil literature in the vicinity of the site including review of the as-built drawings and existing LOTE. . Permits: We will comply with the City and Caltrans Permit requirements. We will obtain necessary utility clearances for field exploration. . Field Exploration: Based on available information, we anticipate drilling about 17 borings, ranging in depth from 1.5 to 20 meters deep for the ramps and retaining walls. In addition, 15-20 R-Value samples will be collected from the roadway alignment. The boring locations will depend upon the available access and any boring data from previous studies. Some traffic control is asswned at this time in areas where necessary. . Classify and continuously log subsurface soil conditions encountered in each test boring at the time of drilling. Obtain "relatively undisturbed" and bulk samples of substrata from test borings. The borings will be drilled and capped in accordance with the permit requirements. Generally the borings are required to be backfilled with cement grout. . Laboratory Testing: PerfoIl11 laboratory tests on representative soil samples such as moisture density, direct shear, unconfined compression, gradation analyses, R-value tests, corrosion tests and Plasticity Index test, as necessary. . Soils Analysis/Evaluation: PcrfoIl11 engineering analyses to develop design recommendations for the proposed pavement. embankment slopes and retaining structures. PerfoI111 corrosion stlldy of the subsoils per Caltrans guidelines City of fie/mOIlI - Rowe IOI/Ral.\(()1I Ave lC ,HodijïcalÌolIs Proposal - I'S& E o-;'/oó/OO