400 RIVERSIDE RD SEPA 016 - 039 - RIVERSIDE BUSINESS PARK Geotech Report 2025-04-14

' APPENDIX A FIELD EXPLORATION AND LABORATORY TESTING ' Riverside Business Park,Lots 2 and 4 Everett,Washington On November 21 and 22, 2016, we explored subsurface conditions by completing 6 cone penetration tests(CPTs) at the site. The CPT locations were approximately determined in the field using a GPS system. The CPT locations are shown on Figure 2. For reference, the Unified Soil Classification System (USCS) describes soil ' classification on attached Figure A-1. In Situ Engineering, Inc., under subcontract to Terra Associates, Inc. performed the CPTs at locations selected by ' Terra Associates, Inc. The CPTs were each advanced to depths of 60 and 60.5 feet below the surface. The CPT consists of pushing an instrumented, approximately 1 1/2-inch diameter cone into the ground at a constant rate. During advancement, continuous measurements are made of the resistance to penetration of the cone and the friction of the outer surface of a sleeve. The cone is also equipped with a porous filter and a pressure transducer for measuring groundwater or pore water pressure generated. Pore pressure dissipation tests were completed at four of the CPT locations to determine groundwater depths. Measurements of tip and sleeve frictional resistance, pore pressure, and interpreted soil conditions and groundwater depths are summarized in graphical form on the CPT Logs attached in Appendix A. 1 1 Project No. T-7388-1