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CA FS... fo,HCC <br />�`°�e; KZTTZTAL^a COUNTY <br />DEPARTMENT OF PUBLIC WORKS <br />KITTITASCOUKTY <br />a. Review publicly available geologic maps, nearby well logs, and other available <br />geologic/geotechnical information at or near the project site. <br />b. Participate in one (1) site visit to observe surface conditions, and drill rig access, and <br />mark exploration locations for public utility locate. <br />c. Coordinate public utility locating for two (2) soil borings locations; near the proposed <br />culvert replacement abutments. <br />d. Develop a safety plan for exploration work and coordinate with drilling subcontractor. <br />e. Direct, observe, and document two (2) soil borings up to 35 feet deep each, or to bedrock <br />each using air rotary methods. If rock is encountered, rock coring will not be completed <br />as it is typically not necessary for shallow foundation design for short span structures that <br />are except from seismic design. Standard penetration test (SPT) soil samples will be <br />collected about every 5 feet of depth, or at discretion of the on-site engineer or geologist. <br />Drilling and sampling will be observed by a geotechnical engineer or geologist. Borings <br />will be backfilled in accordance with DOE requirements and patched at the surface with <br />cement. Excess soil cuttings from the proposed borings will be spread on site. <br />f Collect near surface representative soil samples and assess particle size distribution of the <br />bank and channel material within 25 feet upstream and downstream of the proposed <br />bridge (total of four samples). <br />g. Review soil and rock samples collected from drilling and bank and channel. <br />h. Complete geotechnical tests on selected soil samples, including moisture content <br />determination, grain size analysis, and plasticity characteristics. <br />i. Participate in a teleconference discussion with the Owner regarding preliminary results of <br />the field investigation. <br />j. The soil boring locations will be tied to the project layout with a station and offset from <br />the existing bridge and shown on a Site Plan. <br />k. Adhere to appropriate maintenance of traffic plan and control (provided by the County) <br />while drill rig is at the project site. <br />The geotechnical scope and cost estimate assumes the replacement culvert/bridge for Coleman Creek will <br />be less than 40 -foot -span structures and will not require seismic hazard evaluation for the <br />structure/foundations, and will be supported on shallow foundations. <br />2. Geotechnical Engineering and Analysis Report <br />a. Review publicly available geologic maps, nearby well logs, and other available <br />geologic/geotechnical information at or near the project site. <br />b. Analyze collected field investigation data to characterize the geotechnical properties of <br />the subsurface. <br />c. Evaluate and provide design/construction recommendations for temporary excavations, <br />and construction dewatering, if needed. <br />d. Provide lateral earth pressures for design any wing walls or abutment walls. <br />e. Evaluate and provide shallow foundation bearing and lateral resistance geotechnical <br />design parameters and construction considerations. <br />f Evaluate overall stability of approach embankment immediately adjacent the culvert. <br />g. Provide grain size analysis results of bank and channel material for use in scour analysis. <br />Scour analysis to be completed by Hydraulics Engineer. <br />h. Participate in up to two, one hour design team meetings by phone to discuss geotechnical <br />design and construction elements of the project. <br />