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The Mark at Eugene January 6, 2026 Geotechnical Investigation and Seismic Hazard Study 2 Project No.: 2251077 Eugene, Oregon Landmark Construction, LLC Disturbed soil samples were obtained in each of the borings using a split-spoon sampler, typically at 2½-foot intervals to 20 feet and at 5-foot intervals thereafter. The Standard Penetration Test (SPT), which is performed when the split-spoon is driven, provides an indication of the relative stiffness or density of the soil. The number of blows required to drive the sampler the final 12 inches of an 18-inch-long drive is recorded and represents the standard penetration resistance, or N-value, in blows per foot (bpf). Relatively undisturbed samples were obtained at various depths by pushing thin-walled Shelby tubes. The borings were continually logged by a FE representative during drilling. The collected samples were sealed to avoid moisture loss and transported to our office for further examination and potential testing. The soil profiles encountered in the borings are shown in the boring logs (Appendix B). The final logs were prepared based on a review of the field logs and the results of the laboratory testing, and an examination of the samples in our office. Upon completion of drilling the boreholes were backfilled in accordance with Oregon Water Resources Department (OWRD) guidelines and capped with asphalt concrete (AC) cold patch, Portland cement concrete (PCC), or gravel to match the existing conditions. A one-inch (I.D.) standpipe piezometer was installed in borehole BH-2 to monitor the groundwater levels. Test Pits We excavated four exploratory test pits at the site on September 25, 2025, using a Yanmar SV40 mini-excavator. The test pit locations are shown in Figure 2A. The test pits extended to maximum depths ranging from ±3.5 to 9.5 feet. The subsurface profiles in the test pits were logged by an FE representative. Grab samples of the excavated soil were obtained at selected depths and retained for examination in our office and possible laboratory testing. Upon completion of each exploration, the test pits were backfilled with the excavated material, which was placed and tamped in place using the excavator bucket. The soil profiles and sampling depths are summarized on the test pit logs in Appendix B. The final logs were prepared based on a review of the field logs and laboratory testing results, and an examination of the soil samples in our office. Additional information regarding the logs and the definitions of symbols and descriptive terms used in the logs are provided on the Important Information and Symbols and the Common Soil Descriptions Terms sheets in Appendix B. The sheets also include a discussion of the interpretation of the subsurface profiles at the exploration locations and the potential for inherent variations in the subsurface conditions across the site.