Res-2017-170 - Laserfiche WebLink

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1.6. Collect near surface representative soil samples and assess particle size distribution of the bank and channel material within 25 feet upstream and downstream of the proposed bridge (total of four samples). 1.7. Review soil and rock samples collected from explorations. 1.8. Complete geotechnical tests on selected soil samples, including moisture content determination, grain size analysis, unconfined compression strength of rock core, and plasticity characteristics. 1.9 . Participate in a teleconference discussion with the Owner regarding preliminary results of the field investigation. 1.10. The soil boring and test pit exploration locations will be tied to the project layout with a station and offset from the existing bridge and shown on a Site Plan. 1.11. Adhere to appropriate maintenance of traffic plan and control (provided by the County) while drill rig is at the project site. 2. Two Residential Culvert Crossings 2.1. The effort described in this Task 3.2.2 shall be completed only after authorization from the COUNTY. 2.2. Participate in one (1) site visit to observe surface conditions, and drill rig access, and mark exploration locations for public utility locate (concurrent with Task 3.1) 2.3. Coordinate public utility locating for two soil borings -one at each crossing near the existing culvert abutments/approaches . 2.4. Develop a safety plan for exploration work and coordinate with drilling subcontractor. 2.5 . Direct, observe, and document two (2) soil borings up to 25 feet deep, or to bedrock each using air rotary drilling methods. If rock is encountered, rock coring will not be completed as it is typically not necessary for shallow foundation design for short span structures that are except from seismic design . Standard penetration test (SPT) soil samples will be collected about every 5 feet of depth, or at discretion of the on-site engineer or geologist. Drilling and sampling will be observed by a geotechnical engineer or geologist. Borings will be backfilled in accordance with DOE requirements and patched at the surface with cement . Excess soil cuttings from the proposed borings will be spread on-site. 2.6. Review soil collected from drilling and test pits explorations. 2.7. Complete geotechnical tests on selected soil samples, including moisture content determination, grain size analysis, and plasticity characteristics. 2.8. Participate in a teleconference discussion with the Owner regarding preliminary results of the field investigation. 2.9. The soil boring locations will be tied to the project layout with a station and offset from the existing bridge and shown on a Site Plan . 2.10. Adhere to appropriate maintenance of traffic plan and control (provided by the County) while drill rig is at the project site.