3315 BROADWAY 2017 HOPEWORKS STATION 2 Geotech Report 2022-10-25

GEOTECHNICAL ENGINEERING STUDY Proposed Building 3319 Broadway Avenue Everett, Washington This report presents the findings and recommendations of our geotechnical engineering study for the site of the proposed building to be located in Everett. We were provided with a preliminary site plan and a topographic map. Dykeman developed the site plan and A.S.P.I Land Surveying and Planning developed the topographic map, which is dated November 14, 2017. Based on the provided site plan, we understand that the subject site will be developed with a new six-story building that will cover nearly the entire site. The proposed building will have no offsets from the northern and eastern property lines and an offset of 5.5 feet from the western property line. We understand the southern building perimeter has a proposed offset that may range from 0 to 5 feet from the southern property line. The lowest floor (P1) will contain a parking garage that daylights to the adjacent alley to the east with a finished floor elevation of 69 feet; this Level P1 finished floor elevation will rise to approximately 73 feet along the western building perimeter. Thus, the proposed excavation across the majority of the site will be relatively small. However, cuts of approximately 11 to 13 feet will be needed along the western edge of the property where the ground level rises up to the Broadway Avenue right-of-way. If the scope of the project changes from what we have described above, we should be provided with revised plans in order to determine if modifications to the recommendations and conclusions of this report are warranted. SITE CONDITIONS SURFACE The Vicinity Map, Plate 1, illustrates the general location of the site on the eastern side of Broadway Avenue in Everett. The rectangular-shaped subject site has dimensions of 215 feet in the north-south direction and 120 feet in the east-west direction. The subject site consists of four adjoining parcels; however only the northern half of the southern-most parcel is included in the proposed development. The existing HopeWorks building covers the southern half of the southern- most parcel and is not part of the project development site. The subject site is covered with four separate asphalt parking lots. The parking areas generally have a western elevation near 72 feet and slope down 68 feet to the adjacent alley to the east. However, the western 6 to 10 feet of the northern parking lot area contains a combination of retaining walls and a rockery where the ground surface rises 10 to 12 feet up to the west to the Broadway Avenue right-of-way. Based on our observations, the four existing parking lots were developed separately and thus the change in elevation up to Broadway Avenue on the subject site's western end occurs over four separate retaining walls. The northern parcel (Tax No. 00439079600500) contains a 12-foot-tall ecology block retaining wall along its western end and "returns" to the east along nearly the full length of the northern and southern parcel property lines. The western section of the wall is offset approximately 8 feet from the western property line, appears to have no toe embedment, and has a noticeable"bow" in the middle. GEOTECH CONSULTANTS,INC.