3620 36TH PL NE 2018-01-02 MF Import

• GeoEngineers, Inc., "Report, Geotechnical Engineering Services, New Aggregate Conveyor, Everett Aggregate Yard, Smith Island, Washington," July 1998. • GeoEngineers, Inc., "Report Geotechnical Engineering Services, Proposed Dock/Bulkhead Rehabilitation Glacier Northwest — Smith Island Everett, Washington," June 2001. • GeoEngineers, Inc., "Report Geotechnical Engineering Services, Proposed Conveyor Foundation:. Glacier Northwest— Smith Island, Everett, Washington," July 2001. • GeoEngineers, Inc., "Smith Island Phase I Wetland Delineation, Everett, Washington," July 2003. 2.0 FIELD EXPLORATION AND LABORATORY TESTING 2.1 FIELD EXPLORATION Subsurface conditions were evaluated by a field exploration program that consisted of performing three cone penetration tests (CPT) and excavating 22 test pits using an excavator. The CPTs (designated CPT-1 through CPT-3) were each advanced to a depth of 110 feet below the existing ground surface. The test pits (designated TP-1 through TP-22) were excavated across the site in planned facility improvement areas to evaluate near surface compressible soil conditions. The test pits were generally excavated to a depth of 20 feet below the ground surface, which was the limit of the excavation equipment. The CPTs and test pits were located in the Geld using a handheld global positioning system (GPS) and/or by pacing or tape measuring from existing site features. The locations of the explorations were later surveyed by David Evans & Associates, and their locations are shown on Figure 2. Appendix A includes logs of the test pits (Figures A-2 through A-23), logs of the CPTs (Figures A-24 through A-26), and details of the subsurface exploration program. 2.2 LABORATORY TESTING Soil samples obtained from the explorations were transported to GeoEngineers' laboratory in Redmond, Washington and examined to confirm or modify field classifications, as well as to evaluate index and engineering properties of the soil. Representative samples were selected for laboratory testing consisting of moisture content, dry density, Atterberg limits, percent passing the US No. 200 sieve, and consolidation tests. The tests were performed in general accordance with test methods of the American Society for Testing and Materials (ASTrNI)' or other applicable procedures. Appendix B includes a brief 1 discussion of the laboratory tests and test results. 3.0 SITE CONDITIONS 3.1 GENERAL SITE DESCRIPTION The approximately 25-acre site is located in the Snohomish River delta area south of Steamboat Slough at the northwest end of Smith Island. Smith Island is part of an extensive alluvial fan that sits north of the main channel formed by Union Slough on the east and Steamboat Slough to the north. Past land use practices include diking and draining areas for cropland and pasture, and logging yard operations and storage. A dike, that excludes tidal waters from the site, forms the north and west extent of the project area. A historic cut-off slough that runs from east to west is just within the southern boundary of the site. This slough drains through a one-way tide gate during low tide. A north -south running ditch that drains seasonal precipitation into the slough forms the eastern boundary of the Phase I project area. GeoEngineers 3 File No. 10625-001-02J127003