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Ramsey Business Park 95 Infrastructure Replacement December 9, 2020 <br />Project #: 17624.20.MNS Page - 6 <br />gradational transition between differing materials. This action is intended to limit differential frost heave <br />and provide more uniform pavement support. <br />Subgrades should be test rolled using a tandem axle truck. Any soft areas detected should be scarified, <br />dried, and recompacted. If time constraints prohibit drying, soil corrections, extra aggregate base, breaker <br />run, sand subbase, and/or geotextiles may be necessary for stabilization. <br />E.2. Preliminary Pavement Design <br />As mentioned earlier, subgrade soils are expected to consist primarily of clean sands and silty sands. The <br />effective Hveem-stabilometer R-values for dominant sands and silty sands would be expected to range <br />from 30 to 70, and associated Soil Factors from 50 to 75. <br />As noted before, the existing pavements could possibly be milled and then reused as base material <br />provided the reclaimed material meets Mn/DOT Specification 3138 for Class 5 Aggregate Base. <br />F. Construction Testing and Documentation <br />F.1. Excavation <br />A variety of equipment is expected to be capable of perfonning earthwork and grading. An excavator or <br />backhoe with a smooth -lipped bucket is recommended for completing any excavations. This is intended <br />to limit disturbance to the supporting soils being left in place, while also producing a smooth working <br />surface. <br />F.2. Compaction <br />Fill should be placed in lifts adjusted to the compactor being used and the material being compacted. We <br />recommend limiting lifts to no more than 1 foot, assuming large, self-propelled or tow -behind compactors <br />are used. Thinner lifts should be used for lighter compaction equipment. <br />F.3. Cold Weather <br />If the earthwork occurs during freezing temperatures, good winter construction practices should be used. <br />No frozen fill should be used nor should structural filling take place on frozen ground. <br />F.4. Construction Phase Testing and Documentation <br />The bottom of all excavations, grading, and roadway subgrade should be evaluated and documented by <br />geotechnical personnel after the unsuitable materials are removed and before placement of any fill or <br />pavement. Samples of any fill materials and/or alternative gradations of materials proposed for use <br />should be submitted for approval before use. The City may wish to have, or may be obligated to have <br />tests performed regarding the other various paving components. Specification of such requirements is <br />normally the responsibility of the City or their designated design consultant. <br />MINNESOTA <br />IOWA WISCONSIN <br />