Otak, Inc 8/15/2016 - Laserfiche WebLink

Exhibit A Continued The USACE's Levee Safety Program requires that the levee must achieve a"minimally acceptable" or"acceptable"rating on the FDR Inspection Report to remain eligible for USACE's PL84-99 program. The Otak team will compile existing geotechnical exploration data,and perform additional field geotechnical explorations to characterize subsurface conditions in support of preliminary design for levee modifications to meet the PL84-99 objective. Design recommendations will be provided with the intent of addressing levee deficiencies and achieving an acceptable rating from the USAGE,and with the understanding that geotechnical information is needed for dike design purposes,but not a requirement of eligibility for the PL84-99 program.The geotechnical dike evaluation and analysis will be performed in general accordance with the following U.S.Away Corps of Engineers (USAGE) publications: • EM 500-1-1 "Civil Emergency Management Program"PL84-99 requirements • EM 1110-2-1913 "Design and Construction of Levees" • EM 1110-2-1902 "Slope Stability" • ER 1110-2-1806 "Earthquake Design and Evaluation for Civil Works Projects" • ETL 1110-2-569 "Design Guidance for Levee Underseepage" • EC 1110-2-6067 "Engineering and Design:USAGE Process for the National Flood Insurance Program(NFIP) Levee System Evaluation" • ETL 1110-2-6-571 "Guidelines for Landscape Planting and Vegetation Management at Levees, Floodwalls,Embankment Dams,and Appurtenant Structures" 3.1 Report, Mapping and Data Review The Otak team will review historic and current aerial photographs provided by the City. Snohomish County has performed a number of borings,test pits and well installations in the project vicinity associated with their Smith Island Restoration Project. Cornforth will review the final geotechnical report completed for the Smith Island Restoration Project and will review construction records (if any) to establish the historical dike footprint. Assumptions • The City will provide existing reports, surveys,aerial photographs,data,engineering studies,and construction records for the dike and other construction activities near the site. 3.2 Site Reconnaissance In addition to the field reconnaissance performed during the kickoff meeting(Task 1.2),the Otak team will tour the site by foot and by boat(performed at low tide).The site tour will explore and map distressed areas (slope failures,scour, settlement,and seepage)with GPS.The site tour will evaluate construction access routes, staging,and stockpile areas.The tour will check utility crossings (previously identified on the preliminary base map) and note additional utilities that should be included on the project base map (Task 2.1). DD5 Dike Repairs and Improvements Project 5 otak K:\project\32700\32758\Contract\Scope for Phase 1—DD5 dike repairs final 7-22.docx