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Geotechnical Engineering Services Proposal PR89055 <br /> For Pavement Failure Evaluation June 28, 1989 <br /> Northbound Section of Hopyard Road Page 2 <br /> City of Ple~santon <br /> <br /> existing pavement section was constructed. Also, aerial <br /> photographs and published geotechnical reports pertaining to <br /> Hopyard Road and the adjacent developments in the area would <br /> be reviewed to evaluate surface and subsurface conditions <br /> prior to and during construction of the subject street <br /> section. <br /> <br />2. Field Exploration <br /> <br /> In order to assess the existing pavement section and soil <br /> profile below, we plan to drill a total of five (5) borings <br /> in the affected areas within the northbound section. These <br /> borings would extend 15 to 25 feet deep. Through the <br /> exploration borings and information obtained from literature <br /> review, an attempt would be made to define the backfill <br /> material in an old channel which may have existed prior to <br /> the subject roadway construction. <br /> <br /> The field exploration program would be performed under the <br /> technical direction of our soils engineer, who would also <br /> maintain a continuous log .Of the borings, obtain undisturbed <br /> and bulk soil samples, observe groundwater (if encountered) <br /> and other site conditions, and record sampler driving <br /> resistance. The soils would be classified according to the <br /> Unified Soil Classification System. Traffic control would <br /> be provided, if desired by the City. <br /> <br />3. Laboratory Testing <br /> <br /> Laboratory tests would be performed on selected samples to <br /> evaluate their physical and engineering characteristics and <br /> to aid in the engineering analyses. The testing program <br /> may include shear and/or compression, consolidation, <br /> moisture/density, classification, expansion, compaction, <br /> and R-Value tests. <br /> <br />4. Geotechnical Evaluation & Report <br /> <br /> Based on the results of our site reconnaissance, literature <br /> review, field exploration and laboratory testing, we would <br /> perform engineering analyses to evaluate the geotechnical <br /> factors causing the subject pavement failure. The results <br /> of these analyses would be the basis for our conclusions and <br /> recommendations. These would be summarized in a draft <br /> report for the Public works Department's staff review and <br /> comments; the report would contain the following: <br /> <br /> a.Site Plan showing the affected areas and exploratory <br /> boring locations; <br /> <br /> b. Detailed Logs of Borings; <br /> BSK <br /> &Assocsat~ <br /> <br /> <br />