5105 CHINOOK DR 2016-01-01 MF Import

current stability of the site providecl that it is developed in accordance with ihe recommendations containcd in lhis rcport. Erosion laazard The onsitc soils in the developmcnt area have a modcrate erosion potential due to the slopc of the property. 7'hc proper usc of"best management practices" BMPs should be used during development of lhe project to minimizc the potential for erosion and sedimcnt transport. T6e following is a partial list of BMPs that should bc implemcntcd as part of an erosion control plan for the project. • Kceping all exposed soils covered whcn not actively worked • Esteblish a silt fence across the northern exlent of the clearing limits • Scheduling earth work activities during dry conditions . Fstablish tcmporary/permanent vcgetation as soon as possiblc after foundation installution and utility hook-up. With proper implcmentation of best manegcmcnt practices,thc property may bc dcvcloped without significant erosion or sediment transpoA. ', Seismic F�n�ard Generally, there are four types of potential gc�logic he�ards associated with largc seismic events: 1) surficial ground rupture; 2) seismically induced landslidec; 3) liquefnction;and 4) ground motion. 7'he potential for each of these to impact lhe site is discussed below. Thc lot is not within the vicinity of a known fault zonc. Fault �nnes in the Puget Sound region are curtcntly being studied by the United Slates Goological Scrvice (USGS) and huve bcen detertnined to be active and capablc of produciag largc caRhquukes. Much is still to be Icnmcd alxwt thcse fault systems but it is generally hypothesized that their rccumencc intcrval is several thousar►d ycars. Due to thc suspccted long rec�urence interval and the unccrtainty of wherc thc next surface rupture may occur, the potentiel for sur(icial ground rupturc is considercd to be unpredictable and no mitigation is possiblc or necessary. Based on the dense, consolidatcd nnture of the glacial advancc outwatih sediments underlying thc ��p�rty, the risk of n seismically triggered landslide: is considcn:d lo be low. Batcd on thc dcnsc chamctcristic of thc advancc outwash sand and lack of saturatcd gmund conditions, it is our opinion that thc risk of liquefac4on on this sitc is low. Scismic h�.�vds that will affect the hoase will be duc to the intcnsity and duration of thc ground shaking. Ba�cd on thc cncountcrcct suatigraphy, swctural dcsign of thc projcct should bc consistcnt with 20091n�erna�ional Building Code(IBC) guidelines. In accordance with 'I aMc 1613.5.2 of the 2009 IBC, the subjcct sitc would be classificd as Sile Clnss C. Geotechnical F.nRinccrin�; Rccommendallons I�rom a geotcchnic;al cnginecring stnndpoint, thc property is considcred to bc suitablc for Ihc planncd dcvelopmenl of a single family residencc. Thc dcn.sc aJvancc outwash s:u�d sedimcnts will providc suitable foundation bcaring support for thc plenncd residenca Sincc thc residena: foundntion is bcing developed on a modetatc slope it will bc nccca�ry to kcy the foundation into thc densc sand BGC, pllc 14267 209°` Avenue NE WoodfnvElle, WA 98077 (425) 273-5062 1 L�� , � �