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City of Arden Hills <br />Project B2502087 <br />June 13, 2025 <br />Page 19 <br />D.5. Material Classification and Testing <br />D.5.a. Visual and Manual Classification <br />We visually and manually classified the geologic materials encountered based on ASTM D2488. When <br />we performed laboratory classification tests, we used the results to classify the geologic materials in <br />accordance with ASTM D2487. The Appendix includes a chart explaining the classification system we <br />used. <br />D.5.b. Laboratory Testing <br />The exploration logs in the Appendix note most of the results of the laboratory tests performed on <br />geologic material samples. The remaining laboratory test results follow the exploration logs. We <br />performed the tests in general accordance with ASTM procedures. <br />D.6. Groundwater Measurements <br />The drillers checked for groundwater while advancing the penetration test borings, and again after auger <br />withdrawal. We then filled the boreholes or allowed them to remain open for an extended period of <br />observation, as noted on the boring logs. <br />E.Qualifications <br />E.1. Variations in Subsurface Conditions <br />E.1.a. Material Strata <br />We developed our evaluation, analyses and recommendations from a limited amount of site and subsurface <br />information. It is not standard engineering practice to retrieve material samples from exploration locations <br />continuously with depth. Therefore, we must infer strata boundaries and thicknesses to some extent. Strata <br />boundaries may also be gradual transitions, and project planning should expect the strata to vary in depth, <br />elevation and thickness, away from the exploration locations. <br />Variations in subsurface conditions present between exploration locations may not be revealed until <br />performing additional exploration work, or starting construction. If future activity for this project reveals <br />any such variations, you should notify us so that we may reevaluate our recommendations. Such variations <br />could increase construction costs, and we recommend including a contingency to accommodate them.