4800 DOGWOOD DR Geotech Report 2022-10-25

Subsurface Exploration, Geologic Hazards, View Ridge Community Church Addition and Geotechnical Engineering Report Everett, Washington Project and Site Conditions applications. At the time of exploration, we interpreted the existing fill to be near to over the optimum moisture content for compaction. Vashon Advance Outwash The boring encountered sediments interpreted as advance outwash beneath the existing fill. The upper portions, considered the weathered advance outwash, consisted of loose to medium dense, gray brown with orange -brown staining, SAND to silty SAND. The fines content and oxidation level of the advance outwash decreased with depth, while the density increased. The unweathered portion of the advance outwash consisted of a medium dense to very dense, gray, SAND. The Vashon advance outwash was deposited by meltwater streams that emanated from the advancing glacial ice and overridden during the latter portion of the Vashon Stade of the Fraser Glaciation. Advance outwash soils are considered suitable for light foundation loads, provided it has not been disturbed. The typically low silt content allows the advance outwash sands to be reused as structural fill. Published Geologic Map Our interpretations of subsurface conditions on site are generally consistent with a published geologic map of the area, as represented by the Geologic Map of the Everett 7.5' Quadrangle, Snohomish County, Washington, by James P. Minard (1985). The referenced map indicates that the project area is expected to be underlain at shallow depths by Vashon lodgement till with Vashon advance outwash contacts nearby to the east and west. Our interpretation of advance outwash at the project site is in general agreement with the published geologic mapping of the site and vicinity. 4.2 Hydrology Ground water seepage was encountered at the time of drilling in July 2016 from a depth of 5 feet to the bottom of the boring, 21.5 feet. It should be noted that the occurrence, duration, quantity, and level of ground water seepage may vary in response to such factors as changes in season, precipitation, and on- and off -site land use. August 29, 2016 ASSOCIATED EARTH SCIENCES, INC. SKC/Id-KE160351A2-Pro%ectSJ20160351JKEJWP Page 4