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City of Arden Hills <br />Project B2502087 <br />June 13, 2025 <br />Page 18 <br />The cores were measured to obtain approximate bituminous thicknesses, and their material conditions <br />were noted based on visual observation. A sample of underlying base material was obtained at each of <br />the exploration locations and was sent to our laboratory for review by a geotechnical engineer. <br />D.3. Penetration Test Borings <br />We drilled the penetration test borings with a GeoProbe-mounted core and auger drill equipped with <br />hollow-stem auger. We performed the borings in general accordance with ASTM D6151 taking penetration <br />test samples continuously to a depth of 6 feet below existing grade, then at 2 1/2-foot intervals in general <br />accordance to ASTM D1586. The boring logs show the actual sample intervals and corresponding depths. <br />D.4. Exploration Logs <br />D.4.a. Log of Boring Sheets <br />The Appendix includes Log of Boring sheets for our penetration test borings. The logs identify and <br />describe the penetrated geologic materials, and present the results of penetration resistance tests <br />performed. The logs also present the results of laboratory tests performed on penetration test samples, <br />and groundwater measurements. <br />We inferred strata boundaries from changes in the penetration test samples and the auger cuttings. <br />Because we did not perform continuous sampling, the strata boundary depths are only approximate. The <br />boundary depths likely vary away from the boring locations, and the boundaries themselves may occur as <br />gradual rather than abrupt transitions. <br />D.4.b. Geologic Origins <br />We assigned geologic origins to the materials shown on the logs and referenced within this report, <br />based on: (1) a review of the background information and reference documents cited above, (2) visual <br />classification of the various geologic material samples retrieved during the course of our subsurface <br />exploration, (3) penetration resistance performed for the project, (4) laboratory test results, and (5) <br />available common knowledge of the geologic processes and environments that have impacted the site <br />and surrounding area in the past.