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5816 25TH AVE W Geotech Report 2025-06-25
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5816 25TH AVE W Geotech Report 2025-06-25
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6/25/2025 9:58:51 AM
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6/25/2025 9:58:10 AM
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25TH AVE W
Street Number
5816
Address Document Type
Geotech Report
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Kierstein Residence Retaining Wall <br /> Everett, Washington Geotechnical Engineering Report <br /> generally consisted of loose to medium dense, iron oxide stained, moist, olive, silty sand with <br /> trace amounts of gravel. We interpret this to be a small block of lodgement till that has moved <br /> during past landslide activity and thus have placed it under the "Quaternary Landslide Debris" <br /> heading on the boring logs. <br /> Quaternary Landslide Debris (Advance Outwash) <br /> Soils interpreted as advance outwash derived landslide debris were encountered in exploration <br /> borings EB-2 through EB-4 underlying the units described above. These sediments generally <br /> consisted of very loose to medium dense, iron oxide stained, moist, brownish orange to olive, <br /> sand with trace to some amounts of silt and trace amounts of gravel. We interpret this to be <br /> weathered advance outwash that has moved during past landslide activity and thus have placed <br /> it under the "Quaternary Landslide Debris" heading on the boring logs. <br /> Vashon Advance Outwash <br /> Below the units described above in all four of our exploration borings, we typically encountered <br /> medium dense to very dense, moist, light olive to brownish olive, fine sand ranging to fine to <br /> coarse sand with trace to some amounts of silt, and trace amounts of fine gravel, interpreted as <br /> Vashon-age advance outwash. Advance outwash was deposited in rivers and streams ahead of <br /> the southward advancing Vashon-age glacier around 15,000 years ago. <br /> Hydrology <br /> Groundwater was encountered in only one of four our borings (EB-2) at a depth of <br /> approximately 16.5 feet at the time of drilling (April 2019). Based on the lack of observed <br /> groundwater in boring EB-3 located downslope of EB-2, and the lack of observed emergent <br /> groundwater seepage from the slope below the area of the walls, we interpret the observed <br /> groundwater to be locally perched. Perched groundwater may occur within the sediments <br /> encountered at the site during the winter and spring months. Perched ground water occurs <br /> when surface water infiltrates down through relatively permeable soils, such as the fill or the <br /> weathered portions of the glacial deposits, and becomes trapped or "perched" atop a <br /> comparatively impermeable barrier, such as a silt interbed of siltier interbeds within the glacial <br /> soils. This infiltration can occur at great distances from the area where the groundwater is <br /> encountered. It should be noted that fluctuations in the level of the ground water may occur <br /> due to the time of year and variations in the amount of rainfall. The quantity and duration of <br /> flow from excavations made into the perched zone will vary depending on season, topography, <br /> and soil grain size. <br /> SLOPE HAZARDS AND MITIGATION <br /> The western sloping portion of the site is classified as a high landslide hazards critical area <br /> according to City of Everett Critical Areas Code Section 19.37.080. The site is characterized by a <br /> relatively flat topography with a steep slope area along the west side of the site underlain by <br /> loose to medium dense existing fill and native glacial soils. Based on the topographic survey <br /> July 1, 2022 ASSOCIATED EARTH SCIENCES,INC. <br /> SASlih-20180614EO01-002 Page 4 <br />
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