11625 AIRPORT RD SONRISE CHRISTIAN CENTER Geotech Report 2022-10-25

I GEOTECHNICAL EVALUATION EVERETT,WASHINGTON February 6,2018 to Introduction In accordance with your authorization, Cobalt Geosciences, LLC (Cobalt) has completed a geotechnical evaluation for the proposed parking lot located adjacent to 11625 Airport Road in Everett, Washington (Figure 1). The purpose of the geotechnical investigation was to identify subsurface conditions and to provide preliminary geotechnical recommendations for pavement design, earthwork, soil compaction, utilities, stormwater management,and suitability of the on-site soils for use as fill. The scope of work for the geotechnical investigation consisted of a site investigation followed by engineering analyses to prepare this report. Recommendations presented herein pertain to various geotechnical aspects of the proposed development,including drainage and earthwork. 2.o Projectj Description P The project includes development of the site with a new asphalt paved parking lot and stormwater management infrastructure. The parking lot will be used by the Sonrise Christian Center which is located southwest of the property. We anticipate that site grading will include cuts and fills on the order of 8 feet or less. Stormwater runoff will likely be directed into below-grade detention vaults with overflow discharge to an adjacent wetland I area. 3.0 Site Description The site is located north and east of 11625 Airport Road in Everett,Washington(Figure 1). The property consists of one irregularly shaped parcel (No. 00537900oo530i) with a total area of 82,113 square feet. The property is situated with the long direction extending slightly north of east to just south of west. For the purposes of this report and ease of understanding, the long direction extends east to west and the short direction is north to south. The property is currently undeveloped and is vegetated with grasses, blackberry vines, along with sparse Fir and small diameter deciduous trees. There is an apparent wetland area in the eastern portion of the property. A majority of the property is nearly level to slightly undulating. There is a low ridge near the center of the property that extends about 8 feet above the adjacent areas. A paved utility access roadway is located north of the property. The property is bordered to the north and west by undeveloped land, to the south by commercial properties,and to the east by a utility lift station. i I P.O.Box 82243,Kenmore,WA 984328