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June 13, 2024 <br />HWA Project No. 2024-P180-21 <br />Proposal for Geotechnical Engineering Services <br />Everett Stormwater Conveyance Improvements 4 HWA GeoSciences Inc. <br />• Site plans identifying the approximate locations of the explorations. <br />• Summary exploration logs and the results of the geotechnical laboratory tests completed by <br />HWA. <br />• A summary table of pavement and base course thicknesses observed at exploration locations. <br />• A discussion of near surface soil and groundwater conditions at each project site. <br />• An evaluation of the moisture sensitivity of soils at each project site. <br />• Conclusions regarding the anticipated need to dewater temporary excavations, including a <br />discussion relating to potential dewatering methods that may be used if it is anticipated that <br />dewatering will be required. <br />• Recommendations related to trench excavation and temporary shoring. <br />• Recommended allowable temporary excavation slopes. <br />• Recommendations for pipe foundation support, pipe bedding, and initial backfill materials. <br />• Recommended trench backfill compaction criteria. <br />• An evaluation of the suitability of excavated soil for use as trench backfill. <br />• A discussion regarding the feasibility of the jack and bore trenchless construction method for <br />the pipe crossing at Evergreen Way and McGill Avenue. <br />• Recommendations for buried utility vaults, including subgrade preparation, lateral earth <br />pressures, and buoyancy and uplift considerations. <br />• Recommendations for monitoring and testing during construction. <br />DELIVERABLES: <br />• Monthly status reports and invoices <br />• Right of Way Permit Application <br />• Draft and Final Geotechnical Engineering Reports <br />ASSUMPTIONS: <br />• The geotechnical field investigation will be conducted during daylight workdays and <br />hours, with at least 8 hours available per day for on-street work. <br />• The geotechnical field investigations for both project sites will be completed under one <br />mobilization.