5034 OCEAN AVE Geotech Report 2022-10-25

51xx Ocean Avenue (Parcel#00571700100100) November 1, 2017 Everett, Washington Project#17110 that the probability of ground surface rupture impacting the subject property is low, and no mitigations are necessary. Seismically Induced Landslides Due the medium dense to dense native soils and the moderate slopes on the subject property, it is our opinion that the potential for seismically induced slope failures on the site is low and no mitigations are necessary. Liquefaction Liquefaction is a condition where loose, saturated, fine sandy soils lose their shear strength due to rapid pore pressure build-up when subjected to high intensity cyclic loads, such as occur during earthquakes. Due to the medium dense to dense native soils encountered in the subsurface explorations,the liquefaction potential of this site is low, and no mitigations are necessary Ground Motion Seismic hazards that will affect the structure would likely be due to the intensity and duration of the ground shaking. The structural design of the project should be consistent with 2015 International Building Code (2015 IBC)guidelines(Section 1613). Based on the results of our subsurface explorations and our estimation of soil properties at depth utilizing available geologic data, Site Class"C" may be used for the design of the project, as defined by ASCE 7 "Minimum Design Loads for Buildings and Other Structures", Chapter 20. Preliminary Geotechnical Engineering Recommendations Complete architectural and civil engineering plans were not available for review at the time this report was prepared. The design recommendations in this report are considered preliminary, and South Fork Geosciences will need to review future architectural and civil engineering plans to ensure that our recommendations have been properly incorporated into the design of the building and site work and for the recommendation contained in this report to be valid. Our exploration indicates that,from a geotechnical standpoint, the subject property is suitable for the proposed development, provided the risks discussed are accepted and the recommendations contained herein are properly followed. The medium dense to dense Transition Bed sediments underlying the existing fill soil will be capable of providing support for the proposed structures and for new structural fills-the existing fill is not suitable for foundation support. To aid in the design of the project,the following general recommendations for site development are provided. South Fork Geosciences is available for further consultation with respect to specific design item`s, if needed. Site Preparation and Site Grading It is likely that structural fill soils will be required to establish grades for the project. Any fill soil placed beneath a foundation, retaining wall, or driveway/parking area must be constructed as a SOUTH FORK GEOSCIENCES, PLLC Page 4 PO Box 1275 NORTH BEND,WA 98045 425-831-2023 I ANDREW@SFGEO.COM