AgdaPkt 2000-08-14 - Laserfiche WebLink

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'�.3A�1 our subconsultant, using the high air pressure method to minimize potential damage to existin� 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 Regort for the new bridge will be prepared and submitted to Caltrans Division of Structures (DOS). The work will include review of readily available existing soiUgeology literature in the project area, subsurface exploration, soil sampling, laboratory testin;, design recommendations, report preparation, and desi� review/consultation. Generally Caltrans requires a Materials Report (pavement and corrosion studies) and a separate Geotechnical Desi� Report (structures and embanlanents) _. for their projects. In our past projects with Caltrans District 4, when there are minor structures included in a roadway embanlanent construction, we have been able to successfully agree to submit one combined report to save costs and rime required for reviews. Therefore, we have assumed that a combined report will be acceptable to Caltrans. a) Geotechnical Desi� and Materials Report (Combined) • Research and Data Collection: Review of readily available published �eologic and soil literature in the vicinity of the site includin� review of the as-built drawings and e�isting LOTB. • Permits: We will comply with the City and Caltrans Pemnit 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, 1�-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 assumed at this time in areas where necessary. • Classify and continuously log subsurface soil conditions encountered in each test boring at the time of drillin�. 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 gout. • Laboratory Testin�: Perform laboratory tests on representative soil samples such as moisture density, direct shear, unconfined compression, gradation analyses, R-value tests, corrosion tests and Plasticity IndeY test, as necessary. • Soils Analysis/Evaluation: Perform engineenng analyses to develop desi� recommendations for the proposed pavement, embanlanent slopes and retainin� structures. Perform corrosion study of the subsoils per Caltrans guidelines. City of Belmont — Route 101/Ralsron Ave IC �Yfodifications 07/06/00 Proposal — PS&E 3 ___. ,.._._ . .�_ �