2710 14TH ST BLDG A Geotech Report 2023-12-29

' systems. We recommend a preliminary long-term design infiltration rate of not more than 0.2 inches per hour be used for design of the infiltration facilities in the native glacial soils. ' If infiltration facilities will be used for this project, we recommend that in -situ testing, such as pilot infiltration tests (PIT), be completed in accordance with the governing jurisdictional requirements to more accurately determine the infiltration capacity of the soil. ' 5.0 RECOMMENDED ADDITIONAL GEOTECHNICAL SERVICES Throughout this report, recommendations are provided where we consider additional geotechnical services ' to be appropriate. These additional services are summarized below: ■ GeoEngineers should be retained to review the project plans and specifications when complete to ' confirm that our design recommendations have been implemented as intended. ■ GeoEngineers should be retained to provide additional recommendations for design of stormwater infiltration facilities, including performing pilot infiltration testing, if infiltration is being considered at ' the site. ■ During construction, GeoEngineers should observe and evaluate the suitability of the wall and ' foundation subgrades, observe removal of unsuitable soils, evaluate the suitability of floor slab and pavement subgrades, observe installation of subsurface drainage measures including footing drains and underslab drains, observe and test structural backfill includingwall and trench backfill, and provide a summary letter of our construction observation services. The purposes of GeoEngineers construction phase services are to confirm that the subsurface conditions are consistent with those observed in the explorations and other reasons described in Appendix C, Report Limitations and Guidelines for Use. ' 6.0 LIMITATIONS ' We have prepared this report for the exclusive use of the EHA and their authorized agents for the planned Baker Heights Redevelopment project in Everett, Washington. The data and report should be provided to prospective contractors for the bidding or estimating purposes, but our report, conclusions and ' interpretations should not be construed as a warranty of the subsurface conditions. Within the limitations of scope, schedule and budget, our services have been executed in accordance with ' generally accepted practices in the field of geotechnical engineering in this area at the time this report was prepared. No warranty or other conditions, express or implied, should be understood. ' Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored ' by GeoEngineers, Inc. and will serve as the official document of record. Please refer to Appendix C for additional information pertaining to use of this report. I GWENGINEERS� October30,2019 Page20 File No. 2: 288-002-00