7105 JUNIPER DR 2025-03-27 - Laserfiche WebLink

April, 14, 2023 G-5844 7105 —Juniper Dr, Everett, WA Page 3 systems. Descriptions of the variables used for the wall's design& analysis are described in Appendix A —Retaining Wall Calculations. Lateral Earth Pressure To address surcharge load effects, the segmental concrete block retaining wall is anticipated to resist a lateral earth pressure of approximately 75 pcf, as the ground behind the wall is sloped at an inclination of approximately 2.5H:IV. Soil Bearing Pressure Based on the findings of our limited subsurface investigation, and review of the published geologic map for the property (Geologic map of the Everett 7.5-minute quadrangle, Snohomish County, Washington, Minard, J.P., 1985), the soils underlying the retaining wall consist of advance outwash deposits, which were over-ridden by the Puget lobe during the last glacial period. Due to the over consolidated and compact nature of these deposits, allowable bearing capacity is in excess of 3,000 pounds per square foot(psf). The load imposed by the retaining wall was calculated to be approximately 700 psf. Factors of Safety The retaining wall's bearing, overturning, and sliding factors of safety were considered acceptable if they were calculated to be greater than or equal to 2.0, 1.5, and 1.5 respectively. Each factor of safety was calculated at each retaining wall station, which are illustrated on Plate 2— Wall Cross Sections &Elevation View, STABILITY ANALYSIS RESULTS The results of our calculations for the retaining wall's factors of safety at the stations used for the cross sections are described in the attached Appendix A ---Retaining Wall Calculations, and are as follow: Bearing FoS Overturning FoS Sliding FoS 1, STA: + 25.50' > 3.0 1.91 1.91 2. STA: +40.00' > 3.0 1.58 1.58 GEO Group Northwest, Inc.