2023/04/19 Council Agenda Packet

Full street right-of-way between W. Mukilteo Blvd to Seahurst Ave., inclusive of intersections. Within project limits, Consultant will survey existing surface features including topography breaks, pavement and other hardscape, channelization and signing, significant trees and other significant landscaping, fences, buildings, and paint marks from utility locating services. Storm drainage and other utilities will be surveyed to the first structure or valve outside of the area to be surveyed and mapped. Invert elevations and pipe dimensions will be obtained for existing storm drains and sewer structures within these limits. Consultant will create a topographic and planimetric base map in AutoCAD format from field survey data and utility records. Base mapping will be provided at a horizontal scale of 1 inch = 20 feet showing the features outlined above. A digital surface will be prepared, and contour lines will be shown at one -foot intervals. Parcel lines of properties adjoining street right-of-way will be depicted from available assessor records. The survey data will be referenced to the City's horizontal and vertical datum. It is anticipated that traffic control will be necessary to perform the field surveying of the two Evergreen Way project locations. Traffic control plan preparation, obtaining city approvals, and performing traffic control during field surveying of these project locations will be performed by an outside service. 1.3. Geotechnical engineering and site investigation The Consultant will conduct a geotechnical investigation to identify soil conditions for proposed waterline replacement locations Consultant will review existing available soils data and reports Investigation will consist of conducting a total of nine (9) soil borings (1 boring at project site #2; 2 borings each at project sites #1 & #3; 4 boring at project site #5) with laboratory testing for applicable project location areas. The results of the investigation and analysis will be presented in a geotechnical engineering report. The report will summarize the site investigation, results of laboratory testing and analysis to characterize soil conditions and identify ground water depths for the purpose of planning utility trenching, backfill, and pipe loading. The report will include recommendations on design and construction considerations including potential soil corrosion risks, trench safety and dewatering, slope protection and settlement monitoring related to landslide hazard and soil erosion. Geotechnical field investigation and report will be performed by sub -consultant, GeoEngineers, Inc. Refer to Scope Appendix A-1 for more detail on specific Scope of Services, deliverables, and assumptions. Task 1 Deliverables • Findings/conclusions memorandum from site visits/existing document review, PDF • Existing utility matrix spreadsheet, PDF • Geotechnical investigation summary report, PDF • Survey basemap CAD files and Surface TIN file for City review. Task 1 Assumptions • The Client shall provide the Consultant with copies of any available previous studies, reports, or other pertinent information relative to the project. • It is assumed that right -of -entry permits for private properties will not be required however if determined necessary, it is assumed the Client shall obtain these permits allowing Consultant access. • Topographic survey base maps will be developed using AutoCAD C3D 2023.