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February 28,2023 G-5835 <br /> 3821 — Shore Ave Everett,WA Page 5 <br /> were observed to be undisturbed and heavily vegetated with near vertical trees, medium sized <br /> bushes, and ivy groundcover. We observed the previously landscaped areas located east of the <br /> proposed retaining wall's location had been partially stripped of vegetation during prior clearing <br /> and grading activities at the project site. <br /> Seismic Hazard Areas <br /> No seismic hazard areas are mapped at the project site by the City of Everett. <br /> Evaluation of Geologic Hazard Areas <br /> Based on the topography, geologic, and hydrogeologic conditions encountered during our <br /> subsurface investigation and visual reconnaissance of the project site, it is our opinion that the <br /> potential for slope instability in the landslide hazard area mapped by the City of Everett near the <br /> project site's western limit is minimal because of the existing vegetated condition of the areas <br /> beyond the proposed project area, and the project's completed condition is anticipated to include <br /> revegetation of disturbed soils within the project area. <br /> Based on our visual reconnaissance,the proposed retaining wall is to be constructed on the <br /> relatively flat to gently sloping topography located near the eastern extent of the mapped <br /> landslide hazard area,and disturbance to the moderately to steeply sloping topography is not <br /> anticipated for the project. <br /> It is also our opinion that soil erosion at the project site can be mitigated through temporary and <br /> permanent erosion control measures and control of surface water runoff. Our recommendations <br /> for appropriate construction BMPs and erosion control are provided in the Conclusions and <br /> Recommendations section of this report. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the results of our visual reconnaissance, subsurface investigation,and our <br /> understanding of the proposed project, it is our opinion that construction of a ecology block <br /> retaining wall can be completed without increasing the risk of erosion or slope instability within <br /> the mapped landslide hazard area, as well as without increasing the risk of damage to <br /> neighboring properties,such that provided that design and construction recommendations <br /> presented in this report are properly implemented(EMC 19.37.080.C.8). <br /> i <br /> GEO Group Northwest, Inc. <br /> I <br />