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HR Green, Inc. <br />Project B2204225 <br />October 3, 2022 <br />Page 9 <br /> <br /> <br />2. Scarify to a minimum depth of 1 foot, moisture condition, and surface compact to at least <br />100 percent of Standard Proctor density. <br /> <br />3. Slope subgrade soils to areas of sand or drain tile to allow the removal of accumulating <br />water. <br /> <br />4. Place pavement engineered fill to grade where required and compact in accordance with <br />Section C.2.f to bottom of pavement section. <br /> <br />5. Test roll the pavement subgrade as described below in Section C.2.e. <br /> <br />C.2.e. Pavement Subgrade Test Roll <br />After preparing the subgrade as described above and prior to the placement of the aggregate base, we <br />recommend test rolling the subgrade soils with a fully loaded tandem-axle truck. We also recommend <br />having a geotechnical representative observe the test roll. Areas that fail the test roll likely indicate <br />soft or weak areas that will require additional soil correction work to support pavements. <br /> <br />The contractor should correct areas that display excessive yielding or rutting during the test roll, as <br />determined by the geotechnical representative. Possible options for subgrade correction include <br />moisture conditioning and recompaction, subcutting and replacement with soil or crushed aggregate, <br />and/or geotextiles. We recommend performing a second test roll after the aggregate base material is in <br />place, and prior to placing bituminous pavement. <br /> <br />C.2.f. Engineered Fill Materials and Compaction <br />Table 2 below contains our recommendations for engineered fill materials and compaction specifications. <br /> <br />Table 2. Recommended Fill and Compaction Specifications* <br />Material Material Specification Compaction Specification <br />Pavement subbase fill Granular Material <br />MnDOT 3149.2.B MnDOT 2106.3.G.1 <br />Subgrade fill Suitable Grading Material <br />MnDOT 2106.2.B.1 MnDOT 2106.3.G.1 <br />Below landscaped surfaces, where <br />subsidence is not a concern <br />Non-Structural Embankment <br />MnDOT 2106.2.B.8 MnDOT 2106.3.G.2 <br />*More select soils comprised of coarse sands with < 5% passing #200 sieve may be needed to accommodate work occurring in <br />periods of wet or freezing weather. <br /> <br />42