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Revised Proposal for Geotechnical Pavement Investigation BSK Proposal GL21-21837B <br /> W. Las Positas Boulevard September 15, 2021 <br /> Pleasanton, California Page 5 <br /> our borings; <br /> • A description of the site geologic setting and associated geology related hazards, including faulting <br /> and expansive soils; <br /> • Conclusions and recommendations related to the geotechnical aspects of: <br /> o Possible causes of the settlement and movement taking place at the Site; <br /> o Possible mitigation options for the Site including, but not limited to: <br /> o Overexcavation and replacement with light weight fill; <br /> o Use of geotextiles and/or geofabrics under the pavement section; <br /> o Control and/or removal of surface water and tree roots; <br /> o Structural support or compaction grouting of bridge approach ramps; <br /> o Recommendations for site preparation, earthwork, and fill compaction specifications; and <br /> o Construction considerations and limitations. <br /> We will provide an electronic copy of our draft report in PDF format. <br /> Task 5—Final Report <br /> Upon receipt of review comments from the City, we will revise our draft report and issue it as final. We <br /> will provide an electronic copy of our final report in PDF format. <br /> OPTIONAL Task 6—Investigation and Report for 1-680 to Hopyard Road Segment <br /> If desired by the City, we can also investigate the portion of West Las Positas Boulevard between 1-680 <br /> and Hopyard Road at a future date. We propose to investigate this portion of the roadway with nine (9) <br /> borings located approximately as shown on Figure 3. The estimated fee for this investigation are <br /> presented in the fee table below as an optional task. This fee assumes that this investigation and report <br /> would be conducted separately from other roadway segments. If this investigation was conducted <br /> concurrently with the main investigation and/or the optional Task 7 below, some cost savings could be <br /> realized. <br /> Note:Two of our planned borings are within the Caltrans right-of way(ROW) as shown on Figure 3.We <br /> can discuss with the City the possibility of moving these borings to alternative locations outside the <br /> Caltrans ROW to avoid obtaining a costly and time consuming Caltrans encroachment permit. However, <br /> if these borings are not drilled within the Caltrans ROW, we will not be able to assess the approach <br /> ramp fill.We have not included fees or time by BSK personnel to obtain a Caltrans drilling permit within <br /> our fee estimate for this task. <br /> OPTIONAL Task 7—Investigation and Report for Stoneridge Drive to Santa Rita Road Segment <br /> If desired by the City, we can also investigate the portion of West Las Positas Boulevard between <br /> Stoneridge Drive and Santa Rita Road at a future date. We propose to investigate this portion of the <br /> roadway with six (6) borings located approximately as shown on Figure 4. The estimated fee for this <br /> investigation are presented in the fee table below as an optional task. This fee assumes that this <br /> investigation and report would be conducted separately from other roadway segments. If this <br />