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40 101 i 40 SECTION 2F - SUBGRADE L DESCRIPTION A. The subgrade will be con.gi acted such that after being compacted it will conform to the line, grade, and crass sections as shown on the Drawings. Shoulders shall be stabilized and compacted as specified herein for subgrades. 2. LIMEROCK BEARING RATIO A. The subgrade shall have a minimum hearing ratio of 40 as determine([ by the Limerock Bearing Ratio Test. In an area where the bearing ratio is less than 40, stabilizing material approved by the Engineer shall be furnished by the Contractor, spread and mixed in accordance with Section 160-5.3 "Mixing" of the 1991 Edition of the Florida D.Q.T. Specifications. 3. CONSTRUCTION DETAILS A. The subgrade shall be shaped, graded, and rolled to contorin to the lines and grades as shown on the Drawings. Fine grading of the subgrade to its final profile shalt be accomplished after the existing ground has been cxcavaicd as close as possible to the design eleva€ions. In fill areas, fine grading of the subgrade shall he accomplished atter till is spread and compacted in accordance. with Section 2C of these Specifications = ,"Backfill and Compaction". B. All drainage culverts and utility conduits which will be installed under the pavement shall be installed prior to the final shaping and compaction of the subgrade. COMPACTION A. The top of the subgrade in both cuts and falls shall be compacted to a minimum of 98 percent of the maximum dry density to the depth specified on the Plans. The required density shall be maintained until the base course has been constructcd. The subgrade shall be compacted with an approved self-propelled steel drum or pneumatic tired roller weighing not less than 8 tons. All hollows and depressions which develop under rolling shall be filled in with suitable. material. The process of grading and rolling shall he repeated until no depressions develop. After compaction, the top surface of the fine grade shall be true to lite and grade at all locatinns. If the fine grade becomes rull t] or di4plxtved due to any cause whatsoever, the Contractor shall regrade it and recompact it. Ditches, drains, unci swales shall be maintained along the completed subgrade section after their construction. B. In no case shall the Contractor proceed to construct the base course oil tate subgrade until the subgrade has been tested for Limerock Bearing Ratios and compaction, line and riade is chcckcd, and approval given by the Engineer.