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HR Green, Inc. <br />Project B2204225 <br />October 3, 2022 <br />Page 12 <br /> <br /> <br />D. Procedures <br /> <br />D.1. Penetration Test Borings <br /> <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 <br />penetration test samples at 2 1/2-foot intervals in general accordance to ASTM D1586. The boring logs <br />show the actual sample intervals and corresponding depths. <br /> <br />D.2. Exploration Logs <br /> <br />D.2.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 and other <br />tests performed. The logs also present the results of laboratory tests performed on penetration test <br />samples and groundwater measurements. <br /> <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 /> <br />D.2.b. Geologic Origins <br />We assigned geologic origins to the materials shown on the logs and referenced within this report, based <br />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 testing performed for the project, (4) laboratory test results, and <br />(5) available common knowledge of the geologic processes and environments that have impacted the <br />site and surrounding area in the past. <br /> <br />D.3. Material Classification and Testing <br /> <br />D.3.a. Visual and Manual Classification <br />We visually and manually classified the geologic materials encountered based on ASTM D2488. When we <br />performed laboratory classification tests, we used the results to classify the geologic materials in <br />45