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City of Everett Edgewater Creek Bridge Replacement <br /> Once the borings are completed and the drilling rods are removed,the core holes in the <br /> bridge deck will be patched with high strength concrete. We anticipate that rebar <br /> dowels will be installed in the side wall of the core holes to properly adhere the new <br /> concrete to the existing bridge deck. CONSULTANT will coordinate with TranTech to <br /> determine the required doweling protocol for patching the pavement cores. After each <br /> core is patched,a steel plate will be placed over the core and surrounding roadway to <br /> allow the associated patch to dry. <br /> 3.3.5 Conduct Phase 2 Explorations(Slope Reconnaissance): CONSULTANT will conduct a <br /> one-day slope reconnaissance of the steep slopes along the ravine adjacent to the bridge. <br /> This reconnaissance will be used to identify critical slope features, signs of slope <br /> instability and to map exposed soil outcroppings. Hand borings and Dynamic Cone <br /> Penetrometer(DCP)testing will be completed along the steep slopes during the <br /> reconnaissance to quantify the thickness of loose,near surface colluvial soils along the <br /> slopes. Information from the slope reconnaissance will be critical in the design of slope <br /> protection measures. <br /> In addition to the one-day slope Reconnaissance, CONSULTANT will conduct two days <br /> of drilling within the ravine with a limited access drill rig. Limited access borings will be <br /> drilled at locations of possible retaining walls or areas of observed slope instability. <br /> Limited access borings will be drilled to depths ranging from 15 to 25 feet below ground <br /> surface, or until practical refusal. No groundwater monitoring wells will be installed <br /> within the limited access borings. <br /> 3.3.6 Generate Boring logs and Assign Laboratory Testing: CONSULTANT will prepare <br /> summary boring logs and perform laboratory testing to evaluate relevant physical <br /> properties of the site soils. Laboratory testing would include moisture content, grain-size <br /> distribution,Atterberg Limits,and direct shear testing. <br /> 3.3.7 Groundwater Monitoring: CONSULTANT shall install a groundwater monitoring <br /> transducer in both of the proposed monitoring wells. These transducers will be set to <br /> acquire groundwater elevation readings every half an hour for the duration of 6 months. <br /> A Hydrogeologist from CONSULTANT shall make two site visits to download and <br /> process the groundwater data. This data will be used to provide geotechnical design <br /> recommendations and to provide prospective contractors with an accurate representation <br /> of the seasonal groundwater variations across the site. <br /> 3.4 Geo Environmental Support <br /> 3.4.1 Review of Existing/Readily Available Data: CONSULTANT will review environmental <br /> regulatory database records,historical documentation, and regulatory agency files(if <br /> deemed necessary)to assess sites of concern,particularly those located adjacent to the <br /> project corridor,that have the potential for hazardous materials impacts to the project. <br /> The data review will be completed per WSDOT"right-sized" Hazardous Materials <br /> Analysis report guidance. Historical information reviewed will include Sanborn Fire <br /> Page 10 of 42 <br />