3214 BROADWAY SEPA 017 - 004 Geotech Report 2025-04-14

American Property Develc ,..lent ES-0599.05 January 16, 2015 Page 2 Updated January 22, 2015 Project Description Construction of an assisted living facility is proposed for the subject property. One level of below grade (garage level) construction relative to existing grades surrounding the property is proposed. Building setbacks from the property line will be minimal, and the use of temporary shoring or a combination of temporary slopes and shoring will be necessary to complete the garage level excavations. The shoring and open-cut excavations will be necessary along the north, south, and west perimeters of the site. To the east, the building structure will daylight along the Broadway Avenue North frontage. Based on current plans, excavations on the order of 12 to 15 feet will be required to establish subgrade elevations for the below grade level. We anticipate the proposed building construction will consist of reinforced concrete and post- tensioned slabs throughout the lower levels. The upper residential levels will be supported on the post-tensioned slab and consist of relatively lightly loaded wood or steel stud framing. Based on our experience with similar developments, we anticipate column loads on the order of 300 to 400 kips, and perimeter wall loads of approximately five thousand pounds per lineal foot. If the above design estimates are incorrect or change, ESNW should be contacted to review the recommendations in this report. ESNW should review the final design to verify that our geotechnical recommendations have been incorporated into the final design. Surface The site is located at 3214 Broadway Avenue North, Everett, Washington. It occupies the northern half of the city block (#763) at Broadway (east side of the street), between 32nd and 33rd Streets (see Plate 1, Vicinity Map). The subject property is rectangular in shape consisting of 5 consecutive lots (lots 28-32) for a total area of approximately 27,000 square feet. The subject property is bordered on the north by 32nd Street and on the south by a two-story brick assisted living facility. The subject property fronts Broadway on the east for approximately 225 feet. An access alley way adjoins the subject property on the west. The approximate limits of the property are illustrated on the Boring Location and Test Pit Location Plan (Plate 2). The subject property was previously used for both residential and commercial purposes, and has recently been cleared of all structures. The overall topography across the site is gently to moderately sloping, and descends at an even angle to the east. Vertical relief across the site east-west is estimated to be on the order of ten to fifteen feet, There are no geologic hazardous areas identified on the subject property. Subsurface Two borings and two test pits were completed at the site for purposes of assessing soil and groundwater conditions. Please refer to the boring and test pit logs provided in Appendix A for a more detailed description of the subsurface conditions. The maximum explored depth was approximately twenty-six feet below existing grade. Earth Solutions NW,LLC