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City of Arden Hills <br />Project B2204011 <br />June 23, 2022 <br />Page 4 <br /> <br /> <br />Figure 1. Project Area Surficial Geology <br /> <br />Image extracted from the Metropolitan Area Geologic Atlas, dated 2007. <br /> <br /> <br />We based the geologic origins used in this report on the soil types, in-situ and laboratory testing, and <br />available common knowledge of the geological history of the site. Because of the complex depositional <br />history, geologic origins can be difficult to ascertain. We did not perform a detailed investigation of the <br />geologic history for the site. <br /> <br />B.2. Boring Results <br /> <br />Table 2 provides a summary of the bituminous section thicknesses measured from borings and cores <br />returned to the laboratory. Note that aggregate base was observed and measured in the field by the drill <br />and coring crews. We did not perform gradation analysis on the apparent aggregate base material <br />encountered as part of the pavement section and cannot conclusively determine if the encountered <br />material satisfies a particular specification. The aggregate base thicknesses should also be considered <br />approximate, as the transitions between the aggregate base and the underlying subgrade are difficult to <br />discern. <br /> <br /> <br /> <br /> <br /> <br />Project Area