330 ELM ST VIEW RIDGE ESTATES 2022-04-04

Y Y Geotechnical Engineering Evaluation View Ridge Estates 330 Building Settlement 330 Elm Street Everett, Washington INTRODUCTION This report presents the results of our geotechnical engineering evaluation for the settlement-related distress at the View Ridge Estates 330 Building located at 330 Elm Street in Everett, Washington, as shown on the Vicinity Map in Figure 1. The purpose of this study is to explore and characterize the site's surface and subsurface conditions, and to provide geotechnical recommendations to mitigate the settlement observed throughout the building. The site is currently occupied by three condominium structures surrounded by grass-covered yard areas, scattered landscaping plants, and few young to mature trees. The subject condo building is situated within the northeastern portion of the site. The ground surface within the property is generally relatively level to gently sloping. Based on discussions with you and review of the provided structural observation report by CG Engineering we understand the eastern portion of the building is experiencing ongoing settlement on the order of 3.0 to 4.9 inches. We also observed sloping floors, interior drywall cracks, and doors that were out of plumb. The site layout within the vicinity of the building and the locations of our explorations are shown on the Schematic Site Plan in Figure 2. SCOPE The purpose of this study is to explore and characterize the site surface and subsurface conditions, and provide our opinion regarding the on-going settlement issues. Specifically, our scope of services included the following: 1. Review available soil and geologic maps of the area,as well as our previous study. 2. Explore the subsurface soil and groundwater conditions within the vicinity of the settling condominium structure with 4 to 5, up to 30-foot deep geotechnical borings, using a limited-access drill rig. The drill rig was subcontracted by NGA. 3. Perform additional subsurface explorations using hand tools, including inside the crawlspace, as warranted. 4. Perform concrete coring and associated patch work within boring locations around exterior concrete walkways, as needed. 5. Perform laboratory analysis on selected soil samples, as needed. 6. Provide our opinions regarding the potential causes of settlement. 7. Provide recommendations for permanently stabilizing the affected areas. 8. Document the results of our findings, conclusions, and recommendations in a written geotechnical report. L\ \n n INELSON GEOTECHNICAL ASSOCIATES, INC.