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City of Everett Point Industrial Center (EPIC) Bridge Project <br /> <br /> Page 10 of 28 <br /> <br />the AGENCY until analytical test results have been received (typically a period of about <br />two to three weeks) and retrieval of IDW drums has been completed (typically an additional <br />two weeks). Waste profile paperwork required for disposal of the IDW will need to be <br />signed by the AGENCY or a AGENCY representative. HWA does not sign any waste <br />profile documentation. HWA will arrange disposal of IDW using a waste disposal <br />subcontractor. The IDW drum disposal estimate is based on soil and groundwater meeting <br />non-hazardous waste (i.e., subtitle D landfill) disposal requirements. If analytical results <br />indicate that hazardous wastes are present, disposal of IDW as a hazardous waste (i.e, <br />subtitle C landfill) may be required, which could incur additional charges and/or extension <br />of the estimated time to dispose of the IDW. <br /> <br />• Conduct Phase 2 Explorations (Slope Reconnaissance): HWA will conduct a one-day <br />slope reconnaissance of the steep slope adjacent to the proposed western bridge abutment. <br />This reconnaissance will be used to identify critical slope features, signs of slope instability <br />and to map exposed soil outcroppings. Hand borings and Dynamic Cone Penetrometer <br />(DCP) testing will be completed along the steep slope during the reconnaissance to quantify <br />the thickness of loose, near surface colluvial soils along the slopes. Information gathered <br />during the slope reconnaissance will be critical in the design of slope protection measures. <br /> <br />• Generate Boring Logs and Assign Laboratory Testing: HWA will prepare summary <br />boring logs and perform laboratory testing to evaluate relevant physical properties of the <br />site soils. Laboratory testing would include moisture content, grain-size distribution, <br />Atterberg Limits, direct shear and consolidation testing. <br /> <br />• Groundwater Monitoring: HWA shall install a groundwater monitoring transducer in the <br />three proposed monitoring wells. These transducers will be set to acquire groundwater <br />elevation readings every half an hour for the duration of 12 months. A Hydrogeologist <br />from HWA shall make four site visits to download and process the groundwater data. This <br />data will be used to provide geotechnical design recommendations and to provide <br />prospective contractors with an accurate representation of the seasonal groundwater <br />variations across the site. <br /> <br />3.5 Geotechnical Engineering Analysis <br /> <br />• Evaluate Field and Laboratory Data: Based on the borings and the geotechnical <br />laboratory test results of selected samples, HWA will generate estimates of the soil <br />strength and other properties needed to evaluate the effects the subsurface conditions <br />will have on the proposed improvements. <br /> <br />• Develop Geologic Cross-Sections: HWA will construct a geologic cross-section along <br />the centerline of the project. This cross-section will show soil conditions along the <br />bridge alignment and will be provided in a geotechnical report. <br /> <br />• Generate AASHTO Seismic Design Parameters: Based on the soils encountered <br />along the alignment, HWA will determine the Site Class for seismic design. The design <br />Exhibit A