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• D <br />-5202 <br />D <br />COBALT <br />GEOSCIENCES <br />December 14, 2020 <br />Jonathan Rempel <br />Rempel8o8 a gmail.com <br />RE: Limited Geologic Evaluation <br />Proposed Landscaping <br />1033 Temple Drive <br />Everett, Washington <br />CITY OF EVERETT <br />P9Tir6ZR&Waes <br />P.O. Box 82243 <br />Kenmore, Washington 98028 <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 to feet as potentially geologically hazardous (steep slope/landslide <br />hazards). <br />www.cobaltgeo.com / (2o6) 331-1097 <br />