2023/04/19 Council Agenda Packet

EXHIBIT A-1 SCOPE OF WORK GEOTECHNICAL ENGINEERING SERVICES CITY OF EVERETT, WATER MAIN REPLACEMENT Y GEOENGINEERS JOB NO. 0661-137-00 INTRODUCTION AND PROJECT UNDERSTANDING GeoEngineers, Inc. is pleased to present our scope and fee estimate for geotechnical engineering services for the proposed Water Main Y project located in Everett, Washington. We understand the City is proposing to upgrade 5 segments of existing 6- to 8-inch diameter water main, bundled together as Water Main Replacement "Y". The proposed segments to be replaced are listed below: 1. Beverly Lane (74th Street SE to 76th Street SE). Replace approximately 920 LF of existing 8-inch diameter asbestos cement pipe with new 8-inch diameter ductile iron water main. 2. 75th Street SE and Evergreen Way Intersection. Replace approximately 110 LF of existing 8-inch diameter asbestos cement pipe with new 8-inch diameter ductile iron water main. 3. Evergreen Way (south of 52nd Street SE). Replace and upsize approximately 525 LF of existing 6- inch diameter asbestos cement pipe with 8-inch diameter ductile iron water main. 4. Interstate 5 bridge (E. Grand Ave. to 4th Street SE). Replace and upsize approximately 800 LF of existing 8-inch diameter ductile iron pipe suspended on 1-5 bridge with new 12-inch diameter ductile iron water main. 5. Madrona Avenue (W. Mukilteo Blvd to SeahurstAve.). Replace and upsize approximately 2,200 LF of existing 6-inch diameter cast iron pipe with new 8-inch diameter ductile iron water main. Geotechnical engineering services are requested for Sites 1 through 3 and Site 5 to evaluate subsurface soil and groundwater conditions and provide geotechnical recommendations for design. Key geotechnical considerations will include trenching and excavation, temporary slopes and temporary shoring, construction dewatering, pipe support, reuse of on -site soils, and geologic hazards and excavation stability. SCOPE OF SERVICES Based on our discussions with the design team, review of the exhibits, and brief site visits, we anticipate our scope will include the following tasks: A. REVIEW AVAILABLE GEOLOGIC AND SUBSURFACE INFORMATION Review geologic maps, soil surveys, and available geotechnical reports in our files and on public data bases regarding subsurface soil and groundwater conditions in the vicinity of the sites.