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City of Everett - Water Main Replacement Y March 23, 2023 Page 3 <br />c. Perform laboratory tests on representative samples of the soils, including tests for moisture <br />content and grain size analyses. <br />d. Evaluate pertinent physical and engineering characteristics of the soils based on the results of <br />the field exploration, laboratory testing and our experience. <br />D. PROVIDE GEOTECHNICAL DESIGN RECOMMENDATIONS <br />a. Describe site conditions including detailed subsurface soil conditions encountered based on <br />results of the above tasks. Geologic descriptions will be provided based on published <br />information, our experience, and the conditions encountered in the borings. <br />b. Provide geotechnical recommendations for design including: <br />• Excavation and temporary slope inclinations for open cuts. <br />• Temporary shoring parameters for conventional systems (internally braced slide rails, <br />trench boxes, etc.) including lateral pressures for partial shoring considerations. <br />• Earthwork/trenching and stability considerations. <br />• Pipe support including bedding and trench backfill criteria. <br />• Suitability of reuse of on -site soils as trench backfill. <br />• Provide a brief discussion of the suitability of trenchless alternatives at Site 2 (75th Street <br />SE and Evergreen Way Intersection), as appropriate. This would include the need for <br />deeper borings at proposed launching/receiving pits, as appropriate. <br />• Pavement design recommendations for restoration. <br />• Construction dewatering considerations including depth to groundwater observed during <br />drilling and estimated permeability coefficients based on laboratory sieve analyses. <br />• Erosion control considerations during construction. <br />E. GEOLOGIC HAZARDS ASSESSMENT <br />Complete a brief geologic hazards assessment (erosion, landslide, and seismic) in accordance <br />with the City's municipal code for inclusion in the geotechnical report. <br />F. GEOTECHNICAL REPORT AND DESIGN TEAM MEETINGS <br />a. Provide consultation and attend design team meetings and conference calls, as requested. <br />b. Prepare a design report (draft and final) presenting our conclusions and recommendations <br />along with supporting boring logs, laboratory data, and other appropriate figures. <br />File No. 0661-137-00 <br />GEOENGINEERSZI <br />