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I. 1 <br /> as close as practical to the erosion failure. A second boring will be located south of the <br /> culvert to compare soil conditions in this area with the north conditions. A piezometer <br /> will be installed in the north boring to monitor groundwater levels,as appropriate. <br /> 4. Complete laboratory tests on representative samples obtained from the explorations. <br /> Anticipated tests include moisture content and particle size analyses. <br /> 5. Complete stability analyses of the roadway embankment considering the results of the <br /> above tasks and information from the hydrologic assessment. This includes an <br /> evaluation of the potential for failure of the roadway embankment during high flows using <br /> SLOPE/W. <br /> 6. Evaluate seepage/piping using SEEP/W for the high water condition: Also evaluate the <br /> potential for exfiltration of water through culvert joints or corrosion. We suggest that the <br /> City of Everett complete a video of the pipe as part of this evaluation. <br /> Hydrologic/Biolo i Jasks: <br /> The purpose of the hydrologic/biologic tasks are to evaluate the stream channel characteristics <br /> upstream, downstream, and at the site of the culvert. This task includes a site assessment in <br /> accordance with the current WDFW fish passage criteria standards as required by regulatory <br /> agencies for project permits, including an evaluation of anadramous fish passage potential. This <br /> task will include: <br /> 1. Complete a site visit by GeoEngineers geomorphologist and hydraulic engineer. Our site <br /> assessment will be completed approximately 300 feet upstream and 300 feet <br /> downstream of the culvert per WDFW guidelines. The field data collection will include: <br /> a. Identify and measure the channel slope and bankfull width at appropriate <br /> intervals along the tributary to assist in development of project concepts,pt;,_suchas <br /> pipe diameter and proposed channelslope. - <br /> b. Evaluate the potential effects of channel re-grading on buried-utilities upstream <br /> of the culvert. <br /> c. Evaluate the fish passage potential from the Sultan River to the culvert site by <br /> identifying the presence of fish passage barriers downstream of the project site. -. <br /> d. Field flag and provide a map to the City of the rough project limits for which <br /> topographic survey is recommended. We assume that the City will contract with <br /> a Professional Licensed Surveyor (PLS) to collect topography and develop base <br /> maps for the project area. We assume these base maps will be provided to us <br /> for completion of the 15% plans. We also assume that sub-grade utilities will be <br /> located and included in the base maps. <br /> Project Permitting Assessment: <br /> Following completion of the site assessment and fish passage evaluation, we propose to <br /> communicate our findings to the WDFW Area Habitat Biologist to solicit their opinion on the fish <br /> passage criteria they plan to require for the culvert replacement. At this time, we anticipate that <br /> Stream Simulation protocol will be required. Our permitting assessment will include: <br /> 1. Identify the permit requirements for the project, including federal, state, and <br /> local permit requirements. Provide design threshold information to the design <br /> team to ensure that the 15%design alternatives maximize the opportunities for <br /> streamlined and nationwide permit approvals. <br /> _. <br /> • <br /> Lake Chaplain Roadway Embankment and Culvert Evaluation <br /> GeoEngineers File No.0661-100-04 122 <br /> Scope of Work-Page 2 <br />