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January 3, 2025 <br />HWA Project No. 2021-159-21 <br />Geotechnical Engineering Report 4 HWA GEOSCIENCES INC. <br />Port Gardner Storage Facility <br />conditions depicted are only for the specific dates and locations reported, and therefore, are not <br />necessarily representative of other locations and times. <br />2.2 GEOTECHNICAL LABORATORY TESTING PROGRAM <br />Laboratory tests were conducted on selected samples from the explorations to characterize <br />relevant engineering and index properties of the soils encountered at the site. The tests included <br />visual classification, natural moisture content determination, grain size distribution, <br />determination of unit weight, direct shear strength testing, and Atterberg Limits (plasticity <br />characteristics). The soil tests were conducted in the HWA laboratory in general accordance with <br />the American Association of State Highway and Transportation Officials (AASHTO) testing <br />standards. Test procedures are discussed in further detail in Appendix B. The test results are <br />presented in Appendix B, and/or displayed on the exploration logs in Appendix A, as <br />appropriate. <br />2.3 2022 ENVIRONMENTAL SAMPLING <br />During geotechnical drilling activities in April 2022, petroleum odors were encountered in soil <br />cuttings from mud rotary borings HWA-2 and HWA-6. Suspect soil cuttings from these borings <br />were placed in separate 55-gallon steel drums and labeled with boring numbers and soil cutting <br />intervals. BC was immediately notified and later contracted HWA to provide environmental <br />consulting services for proper disposal of the drummed soil cuttings. <br />On June 6, 2022, HWA returned to the site to collect a single composite soil sample (PGSF- <br />IDW) consisting of soil cuttings from both drums. The soil sample was placed in clean, unused, <br />laboratory-supplied containers. The sample was labeled with pertinent sampling information, <br />transferred to an ice-filled, insulated cooler, and transported to the analytical laboratory under <br />chain-of-custody procedures. This soil sample was submitted to OnSite Environmental Inc. of <br />Redmond, Washington, an Ecology-accredited third-party analytical laboratory under <br />subcontract to HWA, for standard turnaround time. Based on a limited review of Ecology online <br />documents for the site and general disposal facility requirements, the sample was submitted for <br />chemical analyses for the following contaminants of concern (COCs): <br />• Total Petroleum Hydrocarbons (TPH)-gasoline by NWTPH-Gx <br />• TPH-diesel and -oil by NWTPH-Dx <br />• Benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8260D <br />• Resource Conservation and Recovery Act (RCRA) 8 Metals (Ag, As, Ba, Cd, Cr, Hg, Pb <br />& Se) by EPA Methods 6010D/7471B