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GeoTest Services, Inc.—Revision 1 April 10, 2020 <br /> Kikuchi Retaining Wall, Everett, Washington Project No. 20-0344 <br /> unit Qva)of the Vashon Drift.Advance outwash consists of clean, mostly grey,well stratified sand <br /> with pebbles and cobbles. Less than a half mile directly north of the project site,transitional beds <br /> (map unit Qtb) are shown on the geologic map. Transitional beds were deposited during the <br /> Fraser glaciation to pre-Fraser glaciation in mostly still to slowly moving water. As a result of the <br /> depositional environment, these deposits consist of clay, silt, and very fine to fine-grained sand. <br /> Our on-site exploration indicates that the encountered subsurface soil conditions are generally <br /> in accordance with the published geological information for areas near the project site. <br /> Specifically, the silty, clayey deposits encountered in the subsurface within the test pits suggest <br /> native soils closely match the descriptions under the mapped transitional beds (Qtb) geologic <br /> unit. For the purpose of this report, native soils are referred to as 'transitional bed deposits'. <br /> Ova <br /> /r ' <br /> ! <br /> Ova <br /> C• <br /> Subject Property <br /> 0 wk\ Ovl . . <br /> Q� <br /> Image 2. Screenshot from the Geologic Map of Everett 7.5-Minute Quadrangle, Snohomish County, Washington (Minard 1985). <br /> Advance outwash (map unit Qva) is mapped directly under the subject property.Transitional beds (map unit Qtb) are mapped <br /> directly to the north.On-site subsurface conditions match closely to the descriptions of the transitional bed deposits(Qtb). <br /> Surface Water <br /> Surface water generally flows across the subject property in a north to northwest direction. A <br /> natural drainage flow path is located between the subject property and the neighboring <br /> residence to the west(located at 3329 Tulalip Ave). Surface runoff flows north along the drainage <br /> path and appears to contribute to the erosion and washout of the underlying log bulkhead. <br /> Recently, the drainage was denuded of vegetation. As a result, the bare soil has likely increased <br /> the sheet flow runoff and erosion of the bulkhead. <br /> GeoTest understands that no drains accessing municipal facilities exist in close proximity to the <br /> existing bulkhead or proposed retaining structure in the northwestern quadrant of the property. <br /> Mr. Kikuchi has obtained a drainage easement from his neighbor to the northwest (located at <br /> 5 <br />