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January 3, 2025 <br />HWA Project No. 2021-159-21 <br />Geotechnical Engineering Report 5 HWA GEOSCIENCES INC. <br />Port Gardner Storage Facility <br />• Carcinogenic polyaromatic hydrocarbons (cPAHs) by EPA Methods 8270E/SIM <br />Analytical results of the composite sample indicated the presence of oil-range TPH, <br />ethylbenzene, xylenes, barium, chromium, lead, and cPAHs, all below respective Ecology Model <br />Toxics Control Act (MTCA) cleanup levels. These cleanup levels may not apply to the site but <br />are used for a general indication of environmental conditions at the property. <br />Results were also compared to Ecology’s guidelines for reuse of petroleum-contaminated soils <br />that are generally for use in handling soils from petroleum cleanups, but also may not apply at <br />this site. These Ecology guidelines include four categories: Category 1 end use criteria for <br />unrestricted use; Category 2 soils may be utilized as commercial fill above the water table; <br />Category 3 criteria are suitable for use as paving base material and road construction; and <br />Category 4 end use criteria is for landfill daily cover or asphalt manufacturing. The oil-range <br />TPH, lead, and cPAHs detected in the PGSF-IDW soil sample exceeded Ecology’s Category 1 <br />end use criteria. <br />No other COCs were detected in the PGSF-IDW soil sample analyzed. Analytical results are <br />provided in Table C-1 and Appendix C. <br />HWA coordinated with ACT Environmental (ACTEnviro), a waste disposal company, and the <br />City of Everett, owner of the Port Gardner site, for proper disposal of the IDW drums. On July <br />12, 2022, a representative of ACTEnviro met with City representative Zachary Brown to pick up <br />the IDW drums for final disposal as contaminated soils at the Chemical Waste Management <br />facility in Arlington, Oregon. <br />It should be noted that since the soil sample analyzed was a composite soil sample collected from <br />two drums (i.e., a mixture of multiple smaller grab samples), and was not collected using best <br />practices for environmental assessments (e.g., sample was collected several weeks after drilling <br />occurred and collected from drums), the analytical results may not be representative of in-situ <br />soil conditions at boring locations HWA-2 and HWA-6, and likely under-represents actual <br />concentrations in discrete locations. <br />2.4 2023 LIMITED ENVIRONMENTAL TESTING <br />Based on encountering suspect soils during the April 2022 drilling activities, HWA conducted <br />environmental sampling from additional geotechnical borings in 2023, for IDW disposal and to <br />evaluate limited environmental considerations during construction. In October 2023, HWA <br />collected environmental soil samples from additional geotechnical borings HWA-14P, HWA-15 <br />(noted as boring B15 in Table C-1 and the corresponding environmental laboratory report), and <br />HWA-16P (Figure 2). Borings HWA-14P and HWA-16P were subsequently completed as <br />monitoring wells and developed after completion for collection of environmental groundwater