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Exhibit B <br />ORDINANCE Exhibit A - Page 26 of 55 <br />b. Those areas mapped as high and moderate to high liquefaction susceptibility on the <br />Liquefaction Susceptibility Map of Snohomish County, Washington, Washington State <br />Department of Natural Resources, Palmer, Stephen, et al., September, 2004. <br />3. Erosion hazard areas: <br />a. Those areas defined as high and very high/severe risk of erosion in the Dames and <br />Moore Methodology for the Inventory, Classification and Designation of Geologically <br />Hazardous Areas, City of Everett, Washington: July 1, 1991, or as revised through best <br />available science: <br />(1) High erosion hazard areas include slopes of twenty-five to forty percent in <br />Qva and Qal geologic units; and slopes of greater than forty percent in other <br />(not Qva or Qal) geologic units. <br />(2) Very high/severe erosion hazard areas include slopes of greater than forty <br />percent in Qva and Qal geologic units. <br />b. Those areas defined as medium risk of erosion in the Dames and Moore <br />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 <br />science, when they contain debris and mud flows, gullying or rifling, immature <br />vegetation, or no vegetation: <br />(1) Slopes of twenty-five to forty percent in other (not Qva or Qal) geologic <br />units. <br />4. Other areas which the city has reason to believe are geologically hazardous. <br />B. Geologically Hazardous Slope Setbacks and Slope Protection. <br />1. Geotechnical Assessment Requirements. Development proposals on or within two hundred <br />feet of any area designated as or which, based on site-specific field investigation, the city has <br />reason to believe are geologically hazardous areas shall submit a geological assessment as <br />required by subsection F of this section. <br />2. The setback buffer requirement shall be based upon information contained in a geological <br />assessment, and shall be measured on a horizontal plane from a vertical line established at the <br />edge of the geologically hazardous area limits (both from the top and toe of slope). In the event <br />that a specific setback buffer is not included in the recommendation of the geological <br />assessment, the setback buffer shall be based upon the standards contained in Chapter 19.18 of <br />the International Building Code (IBC), or as the IBC is updated and amended. <br />a. If the geological assessment recommends setback buffers that are less than the <br />standard buffers that would result from application of Chapter 19.18 of the IBC, the <br />specific rationale and basis for the reduced buffers shall be clearly articulated in the <br />geological assessment.