9606 19TH AVE SE PREMIER STORAGE Geotech Report 2022-10-25

Premier Storage Everett, LLC ES-2432 June 26, 2012 Page 2 Revised June 28, 2012 Project Description We understand the subject site will be developed with two, two to three-story public storage buildings, access roadways and paved parking areas. Building A will be three stories constructed near the center of the site, with a gross footprint of about 27,000 square feet and a finish grade of about 478 feet. Building B will be located along the western site margin and will be two stories in height with a gross footprint of about 5,100 square feet and a finish floor elevation of about 475 feet. Grading activities will likely involve cuts and fills on the order of five feet or less to establish the final design grades. A concrete retaining wall will be constructed along the western development envelope to raise grades up to a maximum of about seven feet to accommodate new parking. If existing grades will be modified substantially, ESNW should reevaluate the recommendations provided in this report. Building construction is anticipated to consist of relatively lightly loaded wood or steel framing and slab-on-grade floors. Perimeter foundation loading is expected to range from approximately 3 to 5 kips per foot. Slab-on-grade loading is expected to be on the order of 250 psf. Stormwater management plans were being developed at the time of this report; however, we understand new detention vault(s) will be utilized to accommodate runoff generated from new impervious surfaces. An open-bottom detention vault is planned underneath Building B. 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 plans. SITE CONDITIONS Surface The site is located off the west side of 19th Avenue Southeast in Everett, Washington. The approximate location of the property is illustrated on Plate 1 (Vicinity Map). The site consists of two adjoining tax parcels (Snohomish Tax Parcels 280518-004-051 and -009) totaling about 1.7 acres in size. The site is rectangular in shape and is currently developed with a single-story fast-food restaurant along the south property, asphalt paved parking and drive lanes to the north and a communications tower facility in the southwestern corner. The site is bordered to the north and south by commercial development, to the east by 19th Avenue Southeast and to the west by Interstate 5 northbound lanes. Topography is relatively level across the majority of the site with approximately five feet of total elevation change. A relatively gentle natural slope is present along the western margins of the site which descends about 20 feet to a wetland/drainage area offsite. Based on the topographic survey, the slope is inclined at between 30 to 38 percent. Grading has occurred and is associated primarily with the existing development elements. Review of the ADaPT report indicates the area currently paved on the site has received fill since the report was completed (1999). Vegetation is limited to the western approximately one-third of the site and generally consists of field grass with landscaping elements and trees. Earth Solutions NW,LLC