10521 19TH AVE SE Geotech Report 2022-10-25

INTRODUCTION This report presents the results of our geotechnical engineering investigation at your proposed two-story mixed-use commercial project, in the Everett area of Snohomish County, Washington. The site is located at 10521 — 19th Avenue SE, with the tax parcel number 28052000203000,as shown on the Vicinity Map in Figure 1. You have requested that we complete this report to evaluate subsurface conditions and provide recommendations for site development. For our use in preparing this report, we have been provided with a site plan by Jensen Fey Architects dated February 26, 2016 that shows the preliminary lot layout. PROJECT DESCRIPTION The development will consist of a 7,544 square foot ground level footprint two-story mixed-use commercial building, with retail and office space. The commercial structure is to be located in the northwest region of the property. An elevator pit is expected in the central to eastern region of the structure. No basement or underground parking is anticipated. Sixty-seven surface level parking stalls are planned along the south boundary and central to eastern region. We have not been provided with a grading plan, but we expect that site grading will include minor cuts and fills. SCOPE The purpose of this study is to explore and characterize the subsurface conditions and present recommendations for site development. Specifically, our scope of services as outlined in our Services Agreement, dated March 4, 2016, includes the following: • Review available geologic maps for the site. • Explore the subsurface soil and groundwater conditions in the area of the planned building via test pits. • Evaluate pertinent physical and engineering characteristics of the soils encountered in the test pits. • Prepare a geotechnical report containing the results of our subsurface explorations, and our conclusions and recommendations for geotechnical design elements of the project. SITE CONDITIONS Surface Conditions The roughly rectangular-shaped project site is about 1 acre in size and has maximum dimensions of approximately 220 feet in the east-west direction and 196 feet in the north-south direction.Access to the site is provided by 19th Avenue Southeast on the west side of the site. The site is also bordered by existing single family residential acreage to the east and south, and commercial acreage to the north. A layout of the site is shown on the Site Plan in Figure 2. The ground surface within the site is generally gently sloping down to the west. A small ridge exists in the central region of the site extending east-west that also slopes to the south and north. The site is currently undeveloped, and is vegetated mostly with grass, blackberries, and several small to large bushes and trees. Robinson Noble, Inc