1020 N BROADWAY EVCC STUDENT HOUSING Geotech Report 2022-10-25

Proposal for Geotechnical Engineering Services Proposed Apartments: 1020 North Broadway,Everett,Washington September 27,2017 3.0 SUBSURFACE EXPLORATIONS 3.1 SITE GEOLOGY General geologic information for the project area was obtained by reviewing the Geologic Map of the Marysville Quadrangle, Snohomish County, Washington (Minard 1985). Based on our review,the project site is underlain by Vashon Till—Geologic Map Unit Qvt. Vashon Till consists of an unsorted deposit (diamict) of clay, silt, sand and gravel that has been glacially transported and deposited. This soil has been directly deposited by a glacier and overridden by several thousand feet of glacial ice and is typically dense to very dense. 3.2 SUBSURFACE EXPLORATION Three borings were drilled on the property on August 10, 2017. The borings were drilled using a track-mounted drill rig operated by Boretec, Inc. under subcontract to PanGEO and were logged by a geologist with our firm. The borings were drilled to a maximum depth of 15 1/2 feet below existing grade. The approximate boring locations were located in the field by measuring from property corners and site features and are shown on Figure 2, Site and Exploration Plan. Standard Penetration Tests (SPT)were performed at 21A-to 5-foot depth intervals using a standard, 2-inch diameter split-spoon sampler. The sampler was advanced with a 140- pound drop hammer falling a distance of 30 inches for each strike, in general accordance with ASTM D-1586, Standard Test Method for Penetration Test and Split Barrel Sampling of Soils. The soils were logged in general accordance with ASTM D-2487 Standard Practice for Classification of Soils for Engineering Purposes and the system summarized on Figure A-1,Terms and Symbols for Boring and Test Pit Logs. 3.3 Soil,CONDITIONS For a detailed description of the subsurface conditions encountered at each exploration location, please refer to our boring logs provided in Appendix A. The stratigraphic contacts indicated on the boring logs represent the approximate depth to boundaries between soil units. Actual transitions between soil units may be more gradual or occur at different elevations. The descriptions of groundwater conditions and depths are likewise 17-233 1020 North Broadway Page 3 PanGEO,Inc.