California C-12 Earthwork and Paving Exam
Free study guide and practice questions for the California CSLB C-12 Earthwork and Paving exam — grading and compaction, excavation, asphalt and concrete paving, ADA, OSHA trench safety, and construction stormwater, built from public OSHA standards, the California MUTCD, and Water Boards materials.
Your progress
The C-12 Earthwork and Paving contractor digs, moves, and places the material that forms the surface of the earth — cut, fill, excavation, grading, trenching, and backfill — and mixes, fabricates, and places paving and other surfacing materials. Like every trade license, it requires passing this trade exam in addition to the Law & Business exam.
The CSLB exam outline weights the trade exam in four areas: Planning & Estimating (~20%), Earthwork & Grade Control (~29%), Paving (~30%), and Safety (~21%) — where “Safety” pulls in job-site safety, environmental (stormwater) impact, and traffic control. Earthwork and paving together are most of the exam, so the topics below put the most practice there.
The study material here is built from public, reusable sources: OSHA’s excavation standards (29 CFR 1926 Subpart P), the California MUTCD for work-zone traffic control, the State Water Board’s Construction General Permit for stormwater, and the federal ADA Standards for accessibility — plus standard civil-engineering fundamentals for grading, compaction, and paving. Work through the topics, then take a full timed practice exam.
Study by topic
Planning & Estimating Earthwork
C-12 study guide on planning and estimating earthwork: reading plans, cut and fill, balancing a site, shrink and swell factors, percent grade, and project layout.
Read & practice →02Soils & Compaction
C-12 study guide on soils and compaction: the Proctor test, maximum dry density, optimum moisture content, relative compaction, standard vs modified Proctor, and lifts.
Read & practice →03Excavation & Grading
C-12 study guide on excavation and grading: the pavement structure (subgrade, subbase, base course), load distribution, benching fill into slopes, grade control, and trench backfill.
Read & practice →04Paving & ADA
C-12 study guide on paving: asphalt vs concrete pavement, prime and tack coats, base failure causes, concrete joints, and ADA slope limits for ramps, parking, and cross slope.
Read & practice →05Excavation Safety (OSHA)
C-12 study guide on OSHA trench and excavation safety: when a protective system is required, soil types and slopes, the competent person, access and egress, spoil placement, water, and atmospheres.
Read & practice →06Stormwater & Environmental
C-12 study guide on construction stormwater: when a site needs Construction General Permit coverage, the SWPPP and QSD/QSP roles, and erosion control vs sediment control BMPs.
Read & practice →07Work-Zone Traffic Control
C-12 study guide on work-zone traffic control for paving and roadway jobs: orange signs, taper length, the flagger's STOP/SLOW paddle, and channelizing device spacing.
Read & practice →