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COBALT Cobalt Geosciences,LLC <br /> G E 0 S C I E N C E S P.O.Box 82243 <br /> Kenmore,Washington 98028 <br /> December 14,2020 <br /> Jonathan Rempel <br /> Rempel8o8 ftmail.com <br /> RE: Limited Geologic Evaluation <br /> Proposed Landscaping <br /> 1033 Temple Drive <br /> Everett,Washington <br /> In accordance with your authorization, Cobalt Geosciences, LLC has prepared this letter to <br /> discuss the results of our limited geologic evaluation of steep slope areas near the above- <br /> referenced location. <br /> The proposed construction includes new landscaping development east of the residence. This <br /> development includes a new cast in place concrete wall near the residence, patio areas, and new <br /> terraced railroad tie walls near the east property line. <br /> Site Description <br /> The site is located at 1033 Temple Drive in Everett, Washington. The site consists of one <br /> irregularly shaped parcel(No.00596200400302)with a total area of 0.32 acres. <br /> The western half of the property is developed with a residence and accessory walls and driveway <br /> areas. The remainder of the property is undeveloped and vegetated with grasses, bushes, sparse <br /> trees,and other understory. <br /> The site slopes downward from west to east at magnitudes of 5 to about 50 percent and total relief <br /> of about 55 feet. The site has been previously graded with cuts to allow construction of the <br /> residence. There is evidence of recent grading as part of the current development (landscaping <br /> and invasive vegetation removal). We understand that there are erosion and steep slope hazards <br /> near and likely within the subject property according to City mapping. <br /> Area Geology <br /> The Geologic Map of Washington — Northwest Quadrant, indicates that the site is near the <br /> contacts between Vashon Glacial Till and Vashon Advance Outwash. <br /> Vashon Glacial Till consists of relatively dense mixtures of silt, sand, gravel, and cobbles. These <br /> deposits are typically underlain by Vashon Advance Outwash. The outwash includes dense fine to <br /> medium grained sand. These deposits are typically susceptible to surface erosion. <br /> Geologic Hazards <br /> Most critical area ordinances designate slopes with magnitudes greater than about 40 percent and <br /> vertical relief of at least 10 feet as potentially geologically hazardous (steep slope/landslide <br /> hazards). <br /> www.cobaltgeo.com (2o6)331-1097 <br />