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Exhibit A <br /> Continued <br /> • Soil cuttings and drilling mud will be handled by the City. <br /> • Soils are assumed to be non-contaminated.Any soil cuttings suspected to be contaminated, <br /> based on field observations,will be placed into 55 gallon drums and disposed of by the City. <br /> • The borings will be completed during workday hours over a period of ten business days. Drilling <br /> equipment will remain on site for the duration of exploration activities. <br /> • No site restoration of vegetation will be required for minimal disturbance necessary to conduct <br /> work. <br /> 3.5 Geotechnical Analyses <br /> The Otak team will evaluate geotechnical conditions along the dike alignment based on the existing <br /> and new subsurface data.Based on the review of the existing erosion and scour problems,the <br /> existing problems will be categorized into reaches of similar characteristics (expect 4 for scoping <br /> purposes). For each reach,a geologic cross-section will be prepared to illustrate the existing <br /> conditions and up to two potential repair concepts.The Otak team will develop concepts for raising <br /> the dike. For each of these improvement(dike raising) concepts,the Otak team will complete the <br /> following engineering evaluations. <br /> • Slope stability <br /> • Seepage <br /> • Settlement <br /> • Scour <br /> • Freeboard <br /> • Interior Drainage <br /> The Otak team will confirm that all options will meet the U.S.Aituy Corps of Engineers (USACE) <br /> PL 84-99 eligibility requirements. <br /> Deliverables <br /> • The Otak team will prepare a draft geotechnical report presenting the results of the field <br /> explorations,laboratory testing,geotechnical analyses and design recommendations.The <br /> geotechnical report will indude,as applicable,the following: <br /> o Summarize site investigation program, subsurface conditions and lab testing <br /> o Summarize conceptual options and engineering evaluations <br /> o Site plan showing locations of new borings <br /> o Summary boring logs <br /> o Laboratory test results <br /> o Geotechnical analysis results <br /> Assumptions <br /> DD5 Dike Repairs and Improvements Project 7 <br /> otak <br /> K:\project\32700\32758\Contract\Scope for Phase 1—DD5 dike repairs final 7-22.docx <br />