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Geotechnical Engineering Report <br />4721 Belvedere Ave, Everett -I loot <br />January 18, 2009 <br />RMI File No. 50609 <br />Page 3 <br />The latest glac ial advance over the area is referred to as the Vashon Stade of the Fraser Glaciation, which <br />deposited the glacial materials on site. <br />Literature Review <br />The Geologic Map mentioned above notes that this area contains Vashon till, Qvt, over advance oumash <br />deposits, Qva, underlain by glacial and non -glacial sedimentary deposits, Qtb. [Vashon-age advance <br />outwash (Qva) consists of dense fine to medium sands with gravels. It was deposited in front of the <br />advancing glaciers.) <br />Site Conditions <br />We observed soil exposures on the site. These were identified as sands of the advance outwash deposits, <br />Qva. <br />Hydrologic Conditions <br />We did not observe any seepage on any slopes, <br />Slope Stability <br />The soils on site comprise glacially compacted deposits of advance outwash sands and gravels, Qva. <br />These deposits typically have good strength. We did not observe signs of deep-seated slope failures and <br />would not expect any. It is our opinion that there is not a significant potential for deep-seated slope <br />instability. <br />Seismic Hazard <br />The site is in Site Class C as defined in Tabla 1613.5.2 in the 2006 International Building Code. <br />Hazards associated with seismic activity include liquefaction potential, slope instability and <br />amplification of ground motion due to soft soil. The dense to very dense glacial soils interpreted to <br />underlie this site do not have a significant potential for liquefaction or amplification of ground motion. <br />No significant impact on slope stability is expected due to a seismic event. <br />RMI ASSOCIATES LLC <br />