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City of Arden Hills <br />Project B2204011 <br />June 23, 2022 <br />Page 12 <br /> <br /> <br />C.3.d. Performance and Maintenance <br />We based the above reconstruction section pavement designs on a 20-year performance life. This is the <br />amount of time before we anticipate the pavement will require major rehabilitation. This performance <br />life assumes routine maintenance, such as seal coating and crack sealing. The actual pavement life will <br />vary depending on variations in weather, traffic conditions and maintenance. <br /> <br />Many conditions affect the overall performance of pavements. Some of these conditions include the <br />environment, loading conditions and the level of ongoing maintenance. Regarding bituminous <br />pavements, it is common to have thermal cracking develop within the first few years of placement and <br />continue throughout the life of the pavement. We recommend developing a regular maintenance plan <br />for filling cracks in pavements to lessen the potential impacts for cold weather distress due to frost heave <br />or warm weather distress due to wetting and softening of the subgrade. <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 with 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 tests <br />performed. The logs also present the results of 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 />