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Exhibit A-1 Scope of Work <br />Continued <br />necessary scour calculations will be included in the analysis to support the design of scour <br />countermeasures (toe -down depths). <br />Assumptions: <br />• Evaluation of channel stability impacts upstream of the flap gate removal will be based on <br />assessment of changes in predicted hydraulic conditions and will not include detailed channel <br />stability or sediment transport calculations. <br />• This task does not include detailed design drawings or cost estimates that are assumed to be <br />covered by other project tasks. <br />Deliverables: <br />• Scour and design calculations <br />6.5 Technical Memorandum <br />Write a draft and final technical memorandum that documents the hydraulic analysis and results. <br />Deliverables: <br />• Draft and final technical memorandum in electronic format <br />Task 7 — Geotechnical Analysis (New) <br />This task includes a geotechnical evaluation by GeoEngineers, a subconsultant to Otak. Phase 1 <br />geotechnical services included a brief review of preliminary drawings and available existing <br />subsurface information, including the 1996 geotechnical report, as -built drawings of the existing TIB <br />bridge and sheet pile wall, and a site visit with the design team. Phase 2 services will include <br />completing geotechnical explorations for the planned pedestrian bridge, completing engineering <br />analysis to support final design, preparing a final geotechnical report for the project, providing <br />consultation, and reviewing the project plans and specifications, as needed. <br />This contract amendment includes scope and fee estimate for Phase 2 of the project. Our Phase 2 <br />scope assumes the as -built drawings will provide information on the backfill type and geometry <br />behind the sheet pile wall for design of the ground anchors and explorations behind the wall are not <br />necessary. Our specific scope of services for Phase 2 is presented below. <br />7. I Explorations and Final Design Report <br />1. Review available subsurface information including our 1996 geotechnical report, as -built <br />drawings of the existing sheet pile retaining wall, and available geologic and topographic <br />W:APW Eng\PROJECTS\A- DR Projects\Riverton Flap Gate Removal (99830103 98-DR03)\Consultant Selection\Phase <br />2\contract\Amendment #1\Riverton SOW_Amend 1_17_I027.docx 4 94 <br />