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City of Arden Hills <br />Project B2502087 <br />June 13, 2025 <br />Page 5 <br />Figure 2. Surficial Geology Map of the Project Area <br />Figure extracted from Map M-178, Surficial Geology of the Twin Cities Metropolitan Area. <br />We based the geologic origins used in this report on the soil types, laboratory testing, and available <br />common knowledge of the geological history of the site. Because of the complex depositional history, <br />geologic origins can be difficult to ascertain. <br />B.2. Ground Penetrating Radar (GPR) <br />GPR was used to approximate pavement layer thicknesses along the road sections for the 2026 pavement <br />management project (PMP). The data was collected at a nominal 1-foot interval. Where “ground truth” <br />data (pavement cores) were performed, the interpreted layers from the GPR scan were compared directly <br />to the measured thicknesses from the cores to improve the overall accuracy of the GPR analysis. <br />The tables shown in the Appendix show summary statistics of the bituminous pavement layer thicknesses. <br />The Graphical Results of the GPR can be found in the Appendix as well. We can provide complete results <br />electronically at your request. <br />A second layer (probable aggregate base) was not always visible in the scans, i.e., it was difficult to identify <br />as a distinct layer due to ambient interference with the GPR signal. A lack of a visible second layer in the <br />Qnm <br />Project Area