202 ALDER ST Geotech Report 2025-07-30 (2)

Proposed View Ridge Subsurface Exploration, Geologic Hazards, Infiltration Potential, Elementaly School Replacement and Preliminary Geotechnical Engineering Report Everett, Washington Project and Site Conditions 2.0 PROJECT AND SITE DESCRIPTION The existing View Ridge Elementary School site is approximately 9.5 acres in total area. Topography generally consists of high areas on the south and east edges of the site, a smaller topographic rise on the northwest part of the site, and relatively level topography elsewhere. Overall vertical relief across the site is approximately 20 feet. Significant slopes are present near the south and east edges of the site. None of the slopes appear to meet the City of Everett definition for Landslide Hazard Areas as defined in Everett Municipal Code Title 19, Chapter 37.080 due to the fact that the slopes are man-made cut slopes shorter than 15 feet, and were presumably created by previously permitted grading. The site is occupied by the existing school buildings, which appear to be about 40 years old. The existing buildings are typically single-story structures with flat roofs. Although the buildings appear to be nearing the end of their design life, a visual reconnaissance of the exterior of the buildings did not reveal indications of poor foundation performance. Existing concrete walkways and asphalt parking lots, driveways, and play areas are in good condition for their age, and show no visual evidence of pervasive settlement or subgrade drainage problems. The project will include demolition of the existing school buildings, and construction of a new elementary school. The new buildings will be located on the west-central part of the site, in an area currently occupied by the existing buildings. We anticipate that the new buildings will be low-rise structures with low to moderate foundation loads typical of school construction methods and materials. New sidewalks, utilities, and pavement areas are also expected. We anticipate that the new school buildings and related improvements will be constructed close to existing grades, without the need for deep earthwork cuts or thick fills. Preliminary project plans include a substantial retaining wall along the south property boundary to accommodate a new driveway. At the time this report was written, the wall location, height, and type had not been determined. We anticipate that we will address the geotechnical requirements of the south wall when these design details have been finalized. 3.0 SUBSURFACE EXPLORATION Our subsurface exploration completed for this project included advancing seven exploration borings and installing one well. The conclusions and recommendations presented in this report are based on the explorations completed for this study. The locations and depths of the explorations were completed within site and budget constraints. September 22, 2010 ASSOCIATED EARTH SCIENCES,INC. BWG/tb-KL•100255A2-Project.s120100255IKEIWP Page 2