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January 12,2021 <br /> Page 3 of 7 <br /> Limited Geologic Evaluation <br /> A. Designation. The following geologically hazardous areas shall not be altered except as <br /> otherwise provided by this chapter: <br /> 1. Landslide hazard areas: <br /> a. Those areas defined as high and very high/severe risk of landslide hazard in the Dames and <br /> Moore Methodology for the Inventory, Classification and Designation of Geologically Hazardous <br /> Areas,City of Everett,Washington:July 1,1991,or as revised through best available science: <br /> (i) Very high/severe: slopes greater than fifteen percent in the Qtb,Qw, and Qls geologic units; <br /> and slopes greater than fifteen percent with uncontrolled fill. <br /> This criteria is present due to the mapped geologic units of Qtb and Qw. <br /> (2) High: slopes greater than forty 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 <br /> Methodology for Inventory, Classification and Designation of Geologically Hazardous Areas, City <br /> of Everett,Washington:July 1, 1991,or as revised through best available science,when combined <br /> with springs or seeps,immature vegetation,and/or no vegetation: <br /> (1) Slopes less than fifteen percent for Qtb,Qw,and Qls geologic units and uncontrolled fill. <br /> (2) Slopes of twenty-five percent to forty percent in all other geologic units. <br /> These areas are also present locally. <br /> c. Any area with all three of the following characteristics: <br /> (i) Slopes greater than fifteen percent;and <br /> (2) Hillsides intersecting geologic contacts with a relatively permeable sediment overlying a <br /> relatively impermeable sediment or bedrock; and <br /> (3) Springs,ground water seepage,or saturated soils. <br /> d. Any area which has shown movement during the Holocene epoch (from ten thousand years <br /> ago to the 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 /> There is a seasonal(presumed)stream near the west property line at the toe of steep slopes. This <br /> stream is likely incising however, we did not observe evidence of heavy stream bank erosion or <br /> rapid incision. At this time,risks associated with the stream are low. <br /> f. Areas of historic failures, including areas of unstable, old and <br /> recent landslides or landslide debris within a head scarp, and areas exhibiting geomorphological <br /> features indicative of past slope failure, such as hummocky ground, slumps, earthflows, <br /> mudflows,etc. <br /> There are local areas of shallow sloughs (historic) on north-facing slopes. Additionally,there are <br /> older mapped slides(Coastal Zone Atlas)east of the site along the north-facing slopes. This slope <br /> system was created during and after glaciation with presumed post-glaciation erosion and mass <br /> wasting. <br /> www.cobaltgeo.com (206)331 io97 <br />