202 ALDER ST Geotech Report 2025-07-30

• Limited Geotechnical Engineering Study View Ridge ElementarySchool Portable Classroom Installation Everett, Washington and Downspout Infiltration Feasibility will be self-contained wood-frame buildings with a crawl space below, supported on shallow foundation pads. We understand that the project will include below-ground utility services and downspout infiltration systems for each new classroom. We anticipate earthwork cuts and fills of 2 feet or less to reach the design building pad elevation, and that building pads will be capped with crushed rock. The portable classroom buildings will be situated near the northern property line adjacent to Alder Street and east of the existing parking lot. The project area is relatively flat with a short northward-facing slope down to Alder Street along the northern property boundary. The project area is currently occupied by a grass playfield. Two existing portable classroom buildings are located adjacent to the proposed new portable classrooms and will remain in use. SUBSURFACE EXPLORATIONS AND CONDITIONS Our field study included drilling three exploration borings on June 26, 2023. The various types of sediments, as well as the depths where the characteristics of the sediments changed, are indicated on the exploration logs presented in Appendix A. The depths indicated on the logs where conditions changed may represent gradational variations between sediment types. If changes occurred between sample intervals in our exploration borings, they were interpreted. Our explorations were approximately located in the field by measuring from known site features and the above-referenced site plan. The site and the approximate locations of the subsurface explorations referenced in this study are presented on the "Site and Exploration Plan" (Figure 2). The conclusions and recommendations presented in this letter-report are based, in part, on the exploration borings completed for this study. The number, locations, and depths of the explorations were completed within site and budgetary constraints. Because of the nature of exploratory work below ground, extrapolation of subsurface conditions between field explorations is necessary. It should be noted that differing subsurface conditions may sometimes be present due to the random nature of deposition and the alteration of topography by past grading and/or filling. The nature and extent of variations between the field explorations may not become fully evident until construction. If variations are observed at that time, it may be necessary to re-evaluate specific recommendations in this letter-report and make appropriate cha nges. Previous Explorations AESI completed a geotechnical study in 2010 during the design phase of the existing school. The 2010 study included six exploration borings and one observation well. Copies of the 2010 exploration logs are included in Appendix A along with logs of borings recently completed for the July 12,2023 ASSOCIATED EARTH SCIENCES,INC. BCY/Id-20100255E004-002 Page 2