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GeoTest Services, Inc.—Revision 1 April 10, 2020 <br /> Kikuchi Retaining Wall, Everett,Washington Project No. 20-0344 <br /> 3323 Tulalip Ave). The drainage easement conveys surface water collected on the subject <br /> property along the northside of the neighboring residence extending to Tulalip Avenue. <br /> ..4 ' <br /> • <br /> F 5 <br /> 4:'+.Y -•��•. ":i' . <br /> • <br /> V,17--,04 +. �r/!. .?.. v��:� t�'`'l.; {�. � ,�lrk w • <br /> aW'► + �f c .y%�r _,.. yX y• , + A � �.�1 +.-� + -` v. <br /> i, y ' ,y^".•� )j Z !..1'�'w;• "1' �`t ~ `n \ - <br /> Photo 3.Natural drainage along the boundary of neighboring property at 3329 Tulalip Ave.Vegetation had recently been stripped <br /> during the construction of the fence. <br /> Groundwater <br /> Perched groundwater seepage was encountered during the test pit exploration of TP-2 at the <br /> time of the site visit on March 17, 2020. Seepage was encountered in the native, silty clay at 3.5 <br /> feet BGS. No perched water was encountered in TP-1 or TP-3 however, seepage atop the dense, <br /> low permeability clay soil could be encountered depending on the time of year. <br /> Perched groundwater conditions occur above the regional groundwater table in the unsaturated <br /> zone and typically occur when loose, more permeable soil is underlain by denser, less permeable <br /> soil. The vertical movement of water through loose soils is restricted once a dense or less <br /> permeable soil (i.e. denser clay-rich transitional deposits) is encountered. Perched groundwater <br /> conditions typically develop in the wet season (November through April) or after extended <br /> periods of rainfall. <br /> The groundwater conditions reported on the exploration logs are for the specific locations and <br /> dates indicated, and therefore may not be indicative of other locations and/or times. <br /> 6 <br />