Earthwork Level 2 Study Guide - Complete Compaction Density Testing LBR Mastery Practice with Verified Answers 2027

Covers full Level 2 blueprint: Compaction goal 95%+ Standard Proctor D698, Moisture ±2% OMC, Equipment Sheepsfoot clay Vibratory sands/gravel Pneumatic finishing, Density testing verifies specs, Sand Cone D1556 volume sand hole, Nuclear Gauge D6938 fast non-destructive, LBR Florida DOT bearing value similar CBR load-bearing typical min LBR 40+ base course design pavement thickness, Cs-137 & Am-241:Be sources, Wet density moisture ∼1 min, Safety licensed operator PPE distance shielding storage log calibration daily, Proofroll final check heavy loaded truck subgrade pass no rutting 1/2" pumping soft spots failure recompact remove replace, Lift thickness 6-8 in max per lift, Testing frequency 1 per 5,000 ft² or 500 yd³, Documentation moisture-density curve test reports location, Corrective action rework if 95%, Moisture key too dry wet poor compaction LBR Florida elsewhere CBR Proofroll visual field verification last step before base, Reference ASTM D698 D1556 D6938 FDOT 120 160, Embankment successive layers max 6-inch typical A-3/A-2-4 ≤15% fines up to 12" allowed compact full width uniform moisture optimum thick lift approved test section 5 passing QC + verification dry fill method avoid unstable organic dewatering, Stabilization lime cement fly ash weak soils geosynthetics geotextile geogrid reinforcement undercut replace unsuitable stabilize organics muck moisture treatment dry wet aerate blend dry purpose bearing capacity settlement stability, QC contractor sampling testing documentation QA/IA department independent assurance verification, Key tests nuclear gauge D6938 Modified Proctor FM 1-T 180 max dry density optimum moisture Gradation Atterberg Limits AASHTO M145 classification, Lot definition same material source consistent process uniform placement, Control charts weekly QC summary report, Exam 70% passing Level 2 80% Level 1, Governing docs Section 120 excavation embankment Standard Plans Index 505 120 ERS Forms -28 Density Log CTQP Manual Prerequisites BT-06-0007 Construction Math BT-06-0008 Contract Plans Reading BT-06-0009 Earthwork Inspection BT-06-0020 Subgrade & Base Inspection, All testing FDOT Materials Manual AASHTO samples retained 60 days weekly summary OSHA 1926 trenching excavation shoring, Passing 70% 2-Hour Exam Edition