2201 100TH ST SW AD SYSTEMS Geotech Report 2022-10-25

GeoTest Services, Inc. April 25,2017 2201 100th Street Southwest, Everett,WA Job No. 17-0186 warehouse will be constructed adjoining the northwest corner of the existing building. We anticipate that the new structure will be of similar construction to the existing building and would utilize shallow conventional foundations. We also anticipate that the proposed building loads would be relatively light. SITE CONDITIONS This section discusses the general surface and subsurface conditions observed at the project site during the time of our field investigation. Interpretations of the site conditions are based upon the results of our review of available information, site reconnaissance, subsurface explorations, laboratory testing, and our experience in the project vicinity. Surface Conditions The generally rectangular, approximately 4.2-acre subject property is located east of Paine Field in Everett, Washington. It occupies approximately 329 feet of frontage along the northern side of 100th Street Southwest and measures approximately 551 feet in the north-south direction. A two-story warehouse/office building (AD Systems) currently occupies the southern half of the subject property. Per the Snohomish County Online Property Information (SCOPI) website, this building was constructed in 1996 and was previously owned by the United States Postal Service and used as a mail transit facility. Asphalt parking and storage areas surround the existing building. The majority of the subject property is relatively level. The outer edges of the property slope down towards the center of the property at an approximate 15 to 20-percent slope over approximately 4 to 6 feet of vertical relief. Industrial and manufacturing buildings border the subject property to the west and north. The property to the east is vacant and heavily vegetated. Subsurface Soil Conditions Subsurface conditions were explored by advancing four test borings (B-1 through B-4) on March 28, 2017. The explorations were each advanced to a depth of 20.5 to 26.5 feet below ground surface (BGS) using a truck-mounted drill rig subcontracted to GTS. Approximate locations of these explorations have been plotted on the Site and Exploration Plan, Figure 2. Disturbed but representative samples were obtained during drilling by using the Standard Penetration Test (SPT) procedure in accordance with American Society for Testing and Materials (ASTM) Test Designation D1586. This test and sampling method consists of driving a standard 2-inch, outside-diameter, split-barrel sampler a distance of 18 inches into the soil with a 140-pound hammer free-falling a distance of 30 inches. The number of blows for each 6-inch interval is recorded and the number of blows required to drive the sampler the final 12 inches is known as the Standard Penetration Resistance ("N") or blow count. If a total of 50 is recorded within one 6-inch interval, the blow count is recorded as the number of blows for the corresponding number of inches of penetration. The resistance, or N-value, provides a measure of the relative density of granular soils or the relative consistency of cohesive soils; these values are reported on the attached boring logs. The borings generally encountered 6 to 6.5 inches of asphalt at the surface. Only one boring (B-1) encountered a layer of base fill directly underlying the asphalt. This base fill generally Page 2 of 13