2001 W MUKILTEO BLVD 2016-01-01 MF Import

� Propoaed McGbe Residence Remodel Everett, WeahinQton Project No. K3-9701022 Page 4 Investigations Series tnap number MF-1438. The SCS map indicatas tl�et the site and edj�cent siopes consist of Aldenva,d gravelly sudy loem at the grouad surfece, wUile map MF-1438 indicatea dut Tc+witional Bed� are exposed st the site. While thae aoil classiScadons do not match preciuly. they are in genersl agreement with one another. Our observations on the aite ere gene�ally conaiaoent with these reference �ourca. We interpret the gcaaular aurficial soils on the site W represent the bale of the Vashon glacial edvance / glacial till sequence, above Sner grained ietaglacial deposib expo�ed in t6e soles of landslide scars on the slopes north and west of t� aite. ii� n.�_ .r .-� __� i.� � � � Wet W seturatcd subsufacx condidona wae obae�ved in ach of the baings whae looxr granular soi(s overlie more denx, silty soils. This sapege reprGxnti a paehed groundwata condi6on. Perched groundwater develops where vertical infiltxation of surfaa wata is impeded by a relativdy impe�mable soil Inyet resul6ng in horizontal migration of the weter in ovedying more permeable soil layets. The pecmccbility of a soil is generally govemed by the amount of void sp�ce pr�sent in the aoil. Silry or clayey soils, or soils of high deesity, oRen can impede intiltration of water. Soil moishue and groundwater wndidons should be expccted W fluctuete with xa9on, prxipitadon emounts, end other ar and off-site factors including site udlization. Due to the time of year that our explontion proQcam waa compleud, it is andcipated that groundwater conditions observed during the exploredon program represent levels near the sea�onal maximucn, elthough higher groundwata level� could oavr duting peak runotievents or as a result of other outside influences. • CSian+iC -o i io a According to the Seismic Zone Map ojd�e UniJed S►ates contained in the 1994 Unijorm Butldtng Code, the project site lies within seismic risk �one 3. Based on soil conditions encountered at the site, the subsurface site conditions are inte�preted to correspond to a seismic soil profile type S= as defined by Table 16-J of the /994 Untjorm Building Codt. Soil profile type S= applies to a pmfile consisting predominantly of inedium dense to dense soil which exceeds 200 fat in depth. The site is considered ro be at relatively low risk of liquefaction damege due to the limited thiclrness of loose surface aoils, and the relatively high density of most of the soils encountered below the site. � •. •► :.� ; �,�� .�: �. The conditions imposed by the proposed devetopment have been evaluated on the besis of the assumed development plan, the engineering characteristics of the subsurface materiels encountered in the borings, and the anticipated soil behavior M ii� during and after wnshuction. Be�ed on the inforn►ation obtained from our subsurfece exploration pmgram, the project appears feasible with respect to soil and groundwater conditions encountered at the site. The conclusions end recommendadons for foundadon, floor slab, and pavement design, along with site development recommendatiou and consideradons, are discussed in the following sections of this report.