Laserfiche WebLink
7. Review soil and rock samples collected from drilling and bank and channel. <br />8. Complete geotechnical tests on selected soil and rock samples, including moisture content <br />determination, grain size analysis, unconfined compression of rock, and plasticity <br />characteristics. <br />9. Facilitate a discussion with the Owner regarding preliminary results of the field <br />investigation. <br />10. The soil boring locations will be tied to the project layout with a station and offset from the <br />existing bridge and shown on a Site Plan. <br />11. Provide and adhere to appropriate maintenance of traffic plan while drill rig is at the project <br />site. <br />12. OPTIONAL: Additional bore holes <br />12.1. Complete up to two (2) additional soil boring up to 35 feet deep using air rotary <br />methods and SPT soil sampling to bedrock or refusal at alternate bridge abutment <br />locations, or if subsurface conditions encountered in TASK 3A soil borings indicate <br />additional exploration is warranted. Supplemental explorations would be completed in <br />the same driller mobilization and manner as soil borings completed for TASK 3A. The <br />need for supplemental investigations will be communicated to the COUNTY for <br />authorization prior to proceeding. <br />12.2. Complete additional geotechnical tests on selected soil samples, including moisture <br />content determination, grain size analysis, and plasticity characteristics. <br />TASK 4GEOTECHNICAL ENGINEERING ANALYSIS & REPORT <br />1. Analyze collected field investigation data to characterize the geotechnical properties of the <br />subsurface. <br />2. Determine seismicity, seismic ground motions, and identify seismic hazards. Seismic design <br />parameters will also be provided. <br />3. Evaluate and provide design/construction recommendations for temporary excavations, and <br />construction dewatering and supporting any necessary bypass structures. <br />4. Provide lateral earth pressures for design of any wing walls or abutment walls. <br />5. Qualitatively analyze slope stability of proposed embankments near the bridge ends. <br />6. Determine suitable bridge foundation type and analyze axial, uplift, lateral resistances and <br />construction considerations for one preferred foundation type. <br />7. Provide gradation characteristics of bank and channel material for use in scour analysis. <br />Scour analysis to be completed by Hydraulics Engineer. <br />8. Participate in up to three (3) 90 -minute design team meetings by phone to discuss <br />geotechnical design and construction elements of the project. <br />9. Provide up to 12 hours of Plans and Specifications support throughout the project. <br />10. Deliverables: <br />10.1. One (1) Draft Geotechnical Report <br />