Agmt00 Mark Thomas Co, Inc - Laserfiche WebLink

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Geotechnical Our approach will be to provide the required geotechnical design information in accordance with Caltrans guidelines implementing a cost effective study program. For this we will try to utilize as much of any existing information for the foundation and the subsurface conditions. Based on the approved Combined Project Study Report/Project Report, there are approximately 560 meters of new sound wall/retaining wall on the north side and about 590 meters of sound wall/retaining wall on the south side of Woodside Road included in the project. Also, there is a tie-back retaining wall approximately 115 meters long under the existing Route 101/84 Separation. For the proposed roadway widening, the geotechnical investigation will be focused on the roadway construction, pavement construction including embankment fill and retaining walls and sound walls. The work will include review of readily available existing soil/geology 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 (paverpent 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. The preparation of the geotechnical report will generally follow the following tasks: Task 1 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, materials report and maintenance information. We have significant data in our files from previous studies. Permits: We will comply with the City and Caltrans Permit requirements. We will obtain necessary utility clearances for field exploration. Task 2 Field Exploration: Based on available information, we anticipate drilling about 20 to 22 borings, up to 10 meters deep, for the retaining walls and sound walls. These will be placed at about 75 meter spacing. The pavement widening will require about 17 shallow borings (1-2 meter deep) to collect R-value samples. The boring locations will likely be along the shoulder of the proposed widening and retaining wall structures, and traffic control/lane closure will be required for the field exploration. City of Redwood City - Route 84 (Woodside Road) Widening Proposal- PS&E 08/08/00 5 of 10 , --"""""""'--,-.-."-,--",......,...-......,,..------...---'..,.-....,..'..,...,