5900 36TH AVE W PRE APP 015 - 032 - SOUNDVIEW BUSINESS CAMPUS - VERITAS Geotech Report 2025-04-22

Veritas Construction Inc ES-4011.03 r June 17, 2016 Page 2 Revised June 22, 2016 , Project Description I We understand construction of a light industrial business center is planned for the subject property. The proposed development will include three concrete tilt-up buildings, paved parking areas, and associated infrastructure improvements. Grading activities will involve cuts and fills on the order of roughly 20 to 40 feet (or more in some areas) to establish design grades. Stormwater will be conveyed to a series of detention vault structures located on the north and west sides of the development. The stormwater vaults will incorporate control structures that release into armored spillways within the natural drainage courses surrounding the property. The proposed buildings will likely consist of concrete tilt-up panel construction supported on 1 conventional foundations. Based on our experience with similar developments, we anticipate wall loads on the order of 2 to 4 kips per lineal foot. Column loads are anticipated to range from 100 to 150 kips. Slab-on-grade loading will likely be on the order of 250 to 350 pounds per square foot (psf). Retaining wall construction will likely incorporate mechanically stabilized earth (MSE) structures and rockeries. I If the above design assumptions are incorrect or change, ESNW should be contacted to review the recommendations in this report. ESNW should review the final design to confirm that our geotechnical recommendations have been incorporated into the final design. SITE CONDITIONS I Surface The subject property is located on the north end of the upland plateau south of Possession Sound in Everett, Washington. The property consists of a single tax parcel (Snohomish County Parcel No. 28040300200100) totaling approximately 39.48 acres. The approximate location of the subject property is depicted on the Vicinity Map (Plate 1). The site is accessed from the north end of 36th Avenue West. The subject site is bordered on the west by a steep, north- trending drainage ravine identified as Japanese Gulch; at the base of this ravine there is a 111 railroad system. The northern margin of the property borders a moderately steep, northward- facing slope. Existing residential developments are located north of the subject site at the base of the steep slope on the north property line and along the north half of the east property line. The rest of the east property line is bordered by 36th Avenue West and undeveloped areas. An undeveloped property is located on the south margin. Topographically, the upland portion of the site is characterized by gentle to moderate, north-to-northwest facing slopes with overall gradients of about 20 to 30 percent. Slope gradients in excess of 40 percent are located along west and north areas of the site. Elevation change on the subject site is on the order of 150 feet. The property is currently undeveloped. Vegetation consists of a mixture of medium to large deciduous and evergreen trees with moderate to dense underbrush. The steep slopes located in the west and north areas of the site are heavily vegetated with no signs of landslide activity based on reconnaissance performed in 2014, 2015, and 2016. 1 Earth Solutions NW,LLC