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JUL-:4-2096 FRf Oi�53 Pn NWA GEOSCIENCEa FAX h0. 4257742714 P. 03 <br />]uly 14,2006 <br />HNA I'rojcct No. 200G-000-21-T054 <br />( G��/i—G'l ( <br />dcsccnding to Mukilteo Boulcvan3. Al thc nearcst point, at lhc noRhcast corncr, chc slopc <br />cr�st appeared to be within 3 fcet or less af the foundaHon edga The foun�ation sclback <br />fiom thc siopc crest gadually increases toward the wcst, a��d about 19 fcct trom ffie <br />norlhwest comcr the foundntion jogs in about 5 fcct away from the slorc. In total, Sfi fect <br />of thc perimcler Footing foundation adjoias the cest of the slope abovc Mukiltoo <br />Bou)cvard. <br />We understand that a 3+ car garage will ocuipy thc caslem cnd of the ]c6 parallelins tl�e <br />slope and will be consttvcicd with a concrcte slab-on•b�raiie floor. Another two-stall <br />Sazagc is shown on the plans to occupy the shori leg of thc L-sh�pcxl sW cture. "Ihe he�:l <br />segment wifl comprise livins quattcrs, and a bcdroan and bonus roam are indicaud on <br />thc plans to overlie the 3-bay garage uai t next to die slope. VVe undcrstand that ihe living <br />quartcrs on thc lowcr Icvcl will bc providcd with a structur�l floor with crawl spacc <br />bcVow. <br />FIELD OBSFAVA7'fO�S <br />At thc timc of Mr. Balanko's inspcction ofthe site, and the foundation system then undcr <br />cons[n:clion, the building cm'clopo had bocn cxcavatcd and the footings had been <br />fonnecl, with runtoicing stecl in place within the base of du formwork. lt was obscrvrd <br />that lhe �oii exposcd in the c�cnvation and foodng arras comprised a ligbt to �nedium <br />Urown, silty and sendy, glacial till, with gavcl and cabblc inclusions. "ihis obsccvation is <br />con�slcne with the geolagic roapping for the project erc,�; D�stribution and DescriDtion oj <br />Cr.o�ogic Units in !hc Mukilleo Qundrangle, Wachingtnn. Uy I.P. Minard, 1982; U.S <br />Gcalogical Survcy, Map h1F-1438. As indicated on this mep, Vashan Till, of the Fnsci <br />Glaciution, c�vc.s ilic uplands portion of this site, and is likely undalain by Advancc <br />putw�ash ancUurTcansetional Rcds, of Crascr to prc-Fr�scr Glaciation time. These <br />dc��osits lian:c bccn iocally modifi�d �nd intlucnced by erosional proccsscs thnt have <br />occnm:d in thc slopcs abovc Pugct Sound and in thc loa+] drainagc channcl crcatcd by <br />Powdtr Mill Cicck immatiat�ly to thc cast of the site. Additionally, it sccros that prior <br />man-made condilions inlluence the site, as thc slope betK•ecn the site and Mulciltu� <br />Boulevard nppears to have becn excavatcd, st Lcast in part, during tonstniction of the <br />roadway ncress Powda'�7ill Gulch, os the ncazby ravine is locally rcfcircd to. <br />The footing excavation basc was probui �vi�h a T-bar and tlie penetratiou was obsttvcd to <br />range from as much as 2 faet in the eatrcme northcast comer, but mduced l0 6-inches or <br />lcss within a fuw to thc wc5�t. For thc majority of thc fnoting ]ength, thc probe <br />penctration was Icss dian an �nch or tx�o, indicating that the native till below the footing <br />basc is dcnsc to acry dcnse. Ho�vcvcr, on thc slope side of the footing cxcavetion, thc <br />soils probctii loose tu the slopc crest, and it is likely that thc surticia! scvcral feet of soil in <br />thc slope is in ¢ loosa condition duc [o wcathcring proccsscs ovcr umc. it was also <br />obscrvcd that a significant colonization by mountain beavcr of the slope atea bclo�• thc <br />sitr, fias ocwrral. Their bumowing acrivity furthcr savcs to looscn thc slopo soils. <br />eoo: sr� ercue War <br />L-d Z590VlSSZ� <br />Z I[WA GeoSar�cEs ]e:c. <br />�� <br />�NI uoqon�lsuc� 18� dg0£0 90 vt I^f <br />