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