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, <br />' <br />Geotechnical Eugineering Letter <br />Alllussaiili Slope Stabilization and Retaining Walls <br />Everett, Washington <br />NGA Pile No. 867612 <br />Deceulber 10, 2012 <br />Page 2 <br />informed us that you would still like to construct a tiered retaining wall system on the steep slope <br />� below your residence as allowed by the City of Everett. The existing site conditions are shown on <br />tlle Schematic Site Pla�1 ii1 Figui-e 2. <br />' <br />' <br />� <br />1 <br />l�or our usc in preparing lhis letter we l�ave bcen provided with an undat'ed, untiticd site plau <br />prepared by you showing the property lines, cxisting residence, and proposed retainiilg wall plan <br />prior to the till placeu�ent. We have bcen requested to evaluate the sit�e surface anci subsurface <br />conditions and provide our opinio�ls and recommendations for slope stabilizatio�l, construction of <br />block retaining walls ancl improving overall site drainage and stability conditions. <br />SCOPE <br />The puipose of this study is to eYplore and cl�aracterize the site subsurface conditions, and <br />� provide general recommendations for site development. Specifically, our scope of services <br />includes t11e followin�: <br />' <br />' <br />1 <br />1 <br />' <br />' <br />1 <br />' <br />1 <br />' <br />1. Review available soil a�1d beologic nzaps of the area. <br />2. Map the conditions on the slope, E�erfoi-�u hand-tool excavatioils, alld evaluate <br />curreilt slope stability conditions. <br />3. Provide rccommendations for restorin�; the slope and constructing a wall systcm <br />compatible with slope conditions. <br />4. Provide recomiucndations for erosion control measures and draivabe <br />iinproveine�lts based on our �lield obser-vatioi7s. <br />5. Provide recornmendations for lonb-term slope mana�ement. <br />6. Docuinent the results of our ti�idings, conclusions, and recominendations in a <br />written geotecln7ical letter. <br />SITE CONDITIONS <br />Surface Conditions <br />The site consists of ai1 irregular sllaped pai-cel covering approximately 0.24 acres. The site is <br />occupied by a two-story residence with a daylight baseme«t within the moderately east to west <br />sloping castcrn portion of the site. A steep southwest-faciu� slope descends froin tl�e residence <br />area to the westei-�� pro�erty line at gradients in thc range of approxi�natcly 27 to 29 degrees (51 <br />NELSON GEOTECHNICAL ASSOCIATES, INC. <br />