2514 RAINIER AVE Geotech Report 2022-10-25

amec % I fosterI wheeler 2.0 EXPLORATORY METHODS We explored surface and subsurface conditions at the project site on September 6, 2016. Our exploration and testing program consisted of the following elements: I ► Visual surface reconnaissance of the site; ► Six borings (designated B-1 through B-6) with standard penetration tests (SPTs) advanced at strategic locations across the site; ► Laboratory testing consisting of six grain-size distribution analyses, five minus-200 I washes, and 15 moisture content determinations performed on selected soil samples; and ► A review of published geologic maps and seismic information in the vicinity of the site. I Table 1 summarizes the approximate locations, surface elevations, and termination depths of the subsurface explorations performed for this investigation. Figure 2 depicts the approximate locations of I these explorations on the conceptual plans provided by ESD. Appendix A presents the detailed field exploration procedures and logs, and Appendix B presents laboratory testing procedures and results. I Table 1 Exploration Locations, Elevations, and Depths Surface Termination Elevation Depth Exploration Relative Location (feet) (feet) B-1 Center of athletic field -82.0 21.5 B-2 Southeast corner of athletic field -81.0 19.0 B-3 17 feet west of southwest corner of covered play area -76.5 19.0 B-4 Bus Lane-33 feet east of school building southeast corner -78.0 15.0 B-5 24 feet north of northern edge of southwest parking lot -76.0 19.0 B-6 Center of parking lot north edge across 26th Street -77.5 19.0 Elevation datum: NAVD88(Vertical)and NAD 83/91 (Horizontal) per North Middle School Modernization Plan Set by Coughlin Porter Lundeen, dated August 29,2017. -=Approximate We selected the specific number, locations, and depths of explorations based on locations of existing I and proposed site features, under the constraints of surface access, underground utility conflicts, and budget. We estimated the relative location of each exploration by measuring from existing features and scaling these measurements from old topographic surveys and construction plans provided to us by the ESD. We then estimated their elevations by interpolating between contour lines shown on I topographic surveys and construction plans. Consequently, the data listed in Table 1 and the locations depicted on Figure 2 should be considered accurate only to the degree permitted by our data sources and implied by our measuring methods. Once a campus-wide survey is completed by I ESD, Amec Foster Wheeler can provide more definitive elevations. Amec Foster Wheeler I 2 Project No.6-917-18116-0 1\\Sea-fs1\WordProc\ Projects\18000s\18116 Everett School District\Geotech Report\Revised\2017_10-19_Everett Middle School Geotech_Sx.docx