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City of Pleasanton Proposal PR88056 <br />Geotechnical Investigation For October 5, 1988 <br />Road Failure Evaluation Page 2 <br />Pleasanton, California <br /> <br /> SCOPE OF WORK <br /> <br />Field Exploration <br /> <br />In order to explore the subsurface conditions, we plan to drill a <br />total of four borings, situated in the existing cracked paved <br />roadway, and over the adjoining right-of-way and canal service <br />road areas, as indicated on the attached Site Plan. The boring <br />in the pavement area would be 40 feet deep and the remaining <br />three borings would each be extended to 30 feet. Drilling would <br />be performed using a truck-mounted rotary drill rig. The field <br />investigation program would also include installation of <br />inclinometer casings in the exploratory borings. The casings <br />would be secured in the borings by a cement grout. The <br />inclinometer casings would be surface-mounted with 10-inch <br />diameter steel boxes with traffic worthy covers and locking lids. <br />Following casing installations, inclinometer readings would be <br />obtained approximately once every one to two weeks at each well <br />in order to assess the rate, direction and depth of possible <br />lateral movements due to ground shear failure in the area. <br />Readings would be obtained using a Terra-TechnologyMini-Probe <br />Torpedo, which measures lateral movement over 2-foot intervals to <br />1/1000 of an inch. The readings would be taken over a period of <br />approximately 6 months to monitor the lateral ground movements <br />affected by changes in groundwater conditions during dry and wet <br />periods. <br /> <br />The field exploration program including inclinometer casing <br />installation and well backfill 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 and <br />bulk soil samples, observe groundwater and other site conditions, <br />record sampler driving resistance and obtain initial <br />inclinometer readings. The soils would be classified according <br />to the Unified Soil Classification System. <br /> <br />Laboratory Testinq <br /> <br />Laboratory tests would be performed on selected samples to <br />evaluate their physical and engineering characteristics and to <br />aid in the engineering analyses. The testing program may include <br />shear and/or compression, consolidation, moisture/density, <br />classification, and soil corrosivity tests. <br /> <br /> BSK <br /> Associates <br /> <br /> <br />