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• <br /> GeoTest Services, Inc. October 8, 2021 <br /> 2405 Hillside Lane, Everett, WA Project No. 21-0845 <br /> Groundwater levels are variable and groundwater conditions will fluctuate depending on local <br /> subsurface conditions, precipitation, and changes in on-site and off-site use. <br /> GEOLOGICALLY HAZARDOUS AREAS <br /> Our geotechnical investigation included an assessment of potential geologic hazards that include <br /> landslide, erosion, flood, liquefaction, and seismic hazards. According to Chapter 19.37 of the <br /> Everett Municipal Code (EMC), Geologically Hazardous Areas include areas that are "susceptible <br /> to erosion, landslide, seismically induced soil failure, or other geological events." Based on this <br /> information and our observations of the subject property, it does not appear that flood, <br /> liquefaction, or seismic hazards are present on or in the immediate vicinity of the subject <br /> property. We have provided commentary on landslide, erosion, and seismic hazards in the <br /> following sections. <br /> Landslide Hazard Areas <br /> According to Chapter 19.37.080.A.1 of the EMC, Landslide Hazard Areas include those areas <br /> 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, <br /> City of Everett,Washington:July 1, 1991,or a revised through best available science".This section <br /> further defines areas of very high/severe risk as those areas "with slopes greater than fifteen <br /> percent in the Qtb, Qw, and Qls geologic units; and slope greater than fifteen percent with <br /> uncontrolled fill". <br /> A slope approximately 32 feet in height comprises the subject property.The slope did not appear <br /> to be showing signs of springs, seeps, cracks, or evidence of instability. We did not observe <br /> noticeable signs of instability on this slope during our visits to the subject property. Existing <br /> residences surround the development on all sides of the slope, in which GeoTest did not observe <br /> apparent cracking within the neighboring building's exterior foundations. The slope comprising <br /> the property (specifically, the slope that comprises Lots 2 and 3 on the southern half of the <br /> proposed development) is classified to be "very high/severe risk" per the EMC due to the <br /> underlying soils consisting of Transitional Beds. This is consistent with the mapped Geologic <br /> Hazard Area information obtained from the City of Everett GIS web application. <br /> Chapter 19.37.080.B of the EMC provides guidelines regarding setback buffers. Since Lots 2 and <br /> 3 of the proposed development consist of a slope that is slightly above 15 percent and may <br /> contain seasonal perched groundwater, the minimum setback buffer that is required by the City <br /> of Everett would normally preclude the construction of a residence on the subject property. <br /> However, Chapter 19.37.080.0 of the EMC also states that alterations may be allowed subject to <br /> specified criteria. Some of this specified criteria state that alterations may be allowed, provided <br /> that the proposed development "will not create a hazard to the subject property, surrounding <br /> properties, or rights-of-way ..."; that the proposed method of construction "will reduce erosion <br /> 5 <br />