2320 106TH ST SW Geotech Report 2022-10-25

October 14,2015 Project No. T-6116-2 Landslide Hazard Areas Section 37.080.1 of the EMC defines Landslide hazard areas as: "a. Those areas defined as high and very high/severe risk of landslide hazard in the Dames and Moore Methodology for the Inventory, Classification, and Designation of Geologically Hazardous Areas,City of Everett, Washington: July 1, 1991: i. Very high/severe: slopes greater than 15 percent in the Qtb, Qw, and Qls geologic units; and slopes greater than 15 percent with uncontrolled fill. ii. High: slopes greater than 40 percent in all other geologic units (not Qtb, Qw, and Qls or uncontrolled fill). b. Those areas defined as medium risk of landslide hazard in the Dames and Moore Methodology for Inventory, Classification, and Designation of Geologically Hazardous Areas, City of Everett, Washington: July 1, 1991, when combined with springs or seeps, immature vegetation, and/or no vegetation: i. Slopes less than 15 percent for Qtb, Qw,and Qls geologic units and uncontrolled fill. ii. Slopes of 25 percent to 40 percent in all other geologic units. c. Any area with all three of the following characteristics: i. Slopes greater than 15 percent. ii. Hillsides intersecting geologic contacts with a relatively permeable sediment overlying a relatively impermeable sediment or bedrock. iii. Springs, groundwater seepage, or saturated soils. d. Any area which has shown movement during the Holocene epoch (from 10,000 years ago to the present)or which is underlain or covered by mass wastage debris of that epoch. e. Any area potentially unstable as a result of rapid stream incision, stream bank erosion, or undercutting by wave action. f. Areas of historic failures, including areas of unstable, old and recent landslides or landslide debris within a head scarp, and areas exhibiting geomorphological features indicative of past slope failure, such as hummocky ground, slumps, earthflows,mudflows,etc. g. Any area with a slope of 40 percent or steeper and with a vertical relief of 15 or more feet, except those manmade slopes created under the design and inspection of a geotechnical professional, or slopes composed of consolidated rock. h. Areas that are at risk of landslide due to high seismic hazard. i. Areas that are at risk of landslides or mass movement due to severe erosion hazards." None of these conditions exist on the site, therefore, it is our opinion that the site is not a landslide hazard as fined by the EMC. Page No. 5