3301 LOMBARD AVE COMPASS HEALTH SUPPORTIVE HOUSING Geotech Report 2022-10-25

GEOTECHNICAL ENGINEERING STUDY Proposed Multi -Story Building 3301 Lombard Avenue Everett, Washington This report presents the findings and recommendations of our geotechnical engineering study for the site of the proposed multi -story building to be located in Everett. We were provided with a site plan that included topographic information, and some floor plans and sections; prepared by Environmental Works dated May 5, 2017. Based on this information, we understand that the development will consist of a multi -story building that will cover a majority of the property. The existing structures will be demolished. The building will have one level of underground parking that will be up to 15 feet below the ground surface along the west side of the site. The parking will be accessed from the eastern alley; the parking level will be close to the alley grade. 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 in Everett. The site is bordered to the west by Lombard Avenue, to the north by 331 Street, to the east by an alley, and to the south by a multi -story apartment building. The ground surface within the site, and in the surrounding vicinity, slopes gently to moderately down toward the east. There is a change in elevation of about 13 feet across the 120-foot site width. A one-story house with a basement that daylights toward the east is close to the northeast corner of the property, and a detached garage is near the southeast corner. A concrete retaining wall is close to the central part of the southern property line. This wall has a height of up to 4 feet and supports soil on the adjacent southern property. The undeveloped areas of the site are generally vegetated with grass. An aerial photo from 2007 shows a second house just west of the existing northeastern house, but it is not present in a 2012 aerial photo. Some of our test pits in that area, described in the next section, encountered rubble that.is probably remnants of that house. The apartment building to the south has three stories and an apparent basement level. It is more than 10 feet south of the location of the proposed building. SUBSURFACE The subsurface conditions were explored by excavating four test pits and one test boring at the approximate locations shown on the Site Exploration Plan, Plate 2. Our exploration. program was GEOTECH CONSULTANTS, INC.