California CSLB C-12 Earthwork and Paving Examination

A grading site requires 1,200 bank cubic yards (BCY) of earth excavation. If the excavated soil has a swell factor of 25%, what is the total volume of loose cubic yards (LCY) that must be hauled away?

• A1,500 loose cubic yards
• B1,440 loose cubic yards
• C1,320 loose cubic yards
• D1,200 loose cubic yards

An earthwork contractor needs to fill a structural pad with 2,700 compacted cubic yards (CCY) of soil. If the soil material has a shrinkage factor of 10%, how many bank cubic yards (BCY) of excavation are required?

• A2,970 bank cubic yards
• B3,000 bank cubic yards
• C2,850 bank cubic yards
• D3,150 bank cubic yards

A parking lot area measuring 200 feet long by 135 feet wide requires a 1-inch lift of Hot Mix Asphalt (HMA). Assuming HMA density is 145 lbs per cubic foot, how many tons of asphalt are required for estimating?

• A210.5 tons of asphalt
• B185.0 tons of asphalt
• C163.1 tons of asphalt
• D142.8 tons of asphalt

Using a 1 inch = 40 feet engineering scale on a site plan, a proposed road alignment measures 14.5 inches long. What is the actual ground distance in feet?

• A440 feet ground distance
• B520 feet ground distance
• C560 feet ground distance
• D580 feet ground distance

According to California Underground Service Alert (USA / 811 Dig Alert) regulations, what is the minimum required advance notice before beginning excavation work?

• A2 working days advance notice
• B3 calendar days advance notice
• C5 working days advance notice
• D1 calendar day advance notice

A cut slope drops 12 feet vertically over a horizontal distance of 40 feet. What is the slope grade percentage?

• A25 percent slope grade
• B30 percent slope grade
• C35 percent slope grade
• D40 percent slope grade

An estimator calculates cut and fill volumes using the Average End Area method. Section A has a cut area of 120 sq ft, Section B has a cut area of 180 sq ft, and the distance between sections is 100 feet. What is the cut volume in cubic yards?

• A666.7 cubic yards volume
• B444.4 cubic yards volume
• C555.6 cubic yards volume
• D777.8 cubic yards volume

How many cubic yards of Class 2 Aggregate Base (AB) are required to cover a subgrade area of 18,000 square feet to a compacted depth of 6 inches?

• A450 cubic yards of base
• B225 cubic yards of base
• C600 cubic yards of base
• D333 cubic yards of base

When reviewing a topographical map, what do contour lines that are spaced very close together indicate about the site terrain?

• AA steep slope terrain
• BA flat plane terrain
• CA uniform mild grade
• DA depression in ground

A scraper cycle time is 6 minutes, and its struck capacity is 18 loose cubic yards. Assuming an job efficiency factor of 50 minutes per hour, what is the estimated hourly production rate per scraper?

• A180 loose cubic yards
• B150 loose cubic yards
• C120 loose cubic yards
• D160 loose cubic yards

What is the primary purpose of obtaining a geotechnical engineering report prior to bidding an earthwork project in California?

• ADetermining surface utility ownership records
• BEstablishing property boundary lines
• CIdentifying soil strata and water table
• DVerifying asphalt supplier locations

According to Caltrans Standard Specifications, what is the standard unit of measurement specified when estimating and bidding Hot Mix Asphalt (HMA)?

• ASquare feet area paving
• BCubic yards volume HMA
• CGallons total binder
• DU.S. Tons net weight

A roadway project requires paving a 24-foot wide lane for 2.5 miles with a 3-inch compacted HMA mat. Assuming 145 lbs/cu ft density, how many tons of HMA must be ordered?

• A5,742 tons of HMA mat
• B4,850 tons of HMA mat
• C6,200 tons of HMA mat
• D3,960 tons of HMA mat

When marking proposed excavation boundaries for USA / 811 Dig Alert field location, what color paint must the contractor use on the ground surface?

• ASafety Red paint color
• BWhite paint or stakes
• CSafety Yellow paint
• DHigh Visibility Pink

If a job site requires 5,000 bank cubic yards of cut and has 5,000 bank cubic yards of fill needed, but the excavated earth swells by 20% loose and shrinks by 10% when compacted, what is the net earth balance?

• AExact balance zero import
• BSurplus of 500 cubic yards
• CShortage of 556 cubic yards
• DSurplus of 1,000 cubic yards

What is the term for a drawing view that cuts vertically through a proposed roadway to show subgrade layers, slopes, and pavement cross-section details?

• APlan view drawing sheet only
• BElevation view drawing
• CIsometric view detail
• DCross-section view sheet

A contractor must apply an asphalt tack coat over 12,000 square yards of existing pavement at a specified application rate of 0.05 gallons per square yard. How many total gallons of tack coat emulsion are needed?

• A600 total gallons tack
• B450 total gallons tack
• C500 total gallons tack
• D750 total gallons tack

When calculating grader production for fine grading a subgrade, what three primary parameters are multiplied together?

• ABucket size, depth, cycles
• BSpeed, moldboard width, efficiency
• CTire size, engine HP, weight
• DFuel rate, slope, operator skill only

On a site plan, benchmark elevation is listed as BM-1 = 124.50 feet. If the laser level instrument height (HI) is established at 129.80 feet, what target rod reading indicates a grade elevation of 122.00 feet?

• A5.30 feet rod reading
• B6.80 feet rod reading
• C7.80 feet rod reading
• D4.50 feet rod reading

What standard safety factor is typically added to estimated aggregate material totals to account for compaction loss, subgrade yield, and site waste?

• A1 to 2 percent allowance
• B3 to 4 percent allowance
• C12 to 15 percent allowance
• D5 to 10 percent allowance

According to ASTM D1557 (Modified Proctor Test), what condition achieves the maximum dry density of soil during compaction operations?

• AOptimum moisture content
• BZero moisture dry state
• CFully saturated soil state
• DAir dried loose state

Under Caltrans specifications for roadway subgrade preparation, what minimum relative compaction percentage is required for the top 0.5 foot of structural subgrade soil?

• A90 percent compaction
• B95 percent compaction
• C98 percent compaction
• D100 percent compaction

Which compaction equipment type is most effective for compacting cohesive clay soils on heavy earthwork grading projects?

• ASmooth steel static roller
• BVibratory plate compactor
• CSheepsfoot tamping roller
• DPneumatic multi-wheel tire

A grading plan calls for a 2:1 (Horizontal to Vertical) cut slope. If the vertical depth of cut is 14 feet, how far horizontally back from the slope toe must the top of slope stake be set?

• A14 feet horizontal run
• B21 feet horizontal run
• C24 feet horizontal run
• D28 feet horizontal run

What chemical additive is most commonly used in California to stabilize expansive clay subgrades before placing aggregate base?

• AHydrated lime treatment
• BSodium chloride salt
• CCalcium chloride brine only
• DAsphalt emulsion tack

According to Caltrans specifications for Class 2 Aggregate Base, what is the maximum loose lift thickness permitted when compacting base material?

• A0.33 foot loose lift
• B0.50 foot loose lift
• C0.75 foot loose lift
• D1.00 foot loose lift

When performing field density verification using a nuclear density gauge (ASTM D6938), what parameter is directly measured by the gauge sensor in direct transmission mode?

• ASoil plasticity index
• BOrganic silt content
• CWet soil density value
• DOptimum moisture level

What is the primary function of installing geotextile stabilization fabric directly over soft, pumping subgrade soils before aggregate base placement?

• AWaterproofing subgrade only
• BPreventing weed growth
• CKilling soil bacteria
• DLayer separation & load

If a slope stake is marked 'C-3.4 / 12.0', what does this surveying notation indicate to the grader operator?

• ACut 3.4 ft at 12.0 ft offset
• BClear 3.4 acres in 12 days
• CCompaction 3.4 % over 12 ft only
• DCrown 3.4 in over 12.0 ft

Which soil classification system is primarily used in geotechnical reports to identify soil grain size distribution and plasticity index for engineering construction?

• AUSDA Agricultural System
• BUnified Soil Classification
• CAASHTO Soil Standard System
• DOSHA Soil Hazard System

When preparing a subgrade area, what visual phenomenon is indicated when heavy equipment tires cause subgrade soil to flex, weave, and pump under load?

• AOptimum compaction state only
• BExcessive dry soil dust
• CExcessive moisture subgrade
• DBedrock refusal horizon

What type of compactor is best suited for achieving surface sealing and high density on granular cohesionless sand and gravel subgrades?

• APneumatic tamp foot roller
• BGrid roller static compactor
• CSmooth wheel static roller
• DVibratory smooth steel drum

A grading elevation at Station 10+00 is 105.00 feet, and at Station 12+50 it is 110.00 feet. Assuming a constant gradient, what is the roadway slope percentage?

• A2.0 percent positive grade
• B3.0 percent positive grade
• C4.0 percent positive grade
• D5.0 percent positive grade

Under Caltrans Section 19 earthwork specifications, what is the maximum permissible rock size allowed in the top 2 feet of structural embankment fill?

• A12 inches max diameter only
• B2.5 inches max diameter
• C6 inches max diameter
• D8 inches max diameter

What grade tolerance is typically permitted for finished aggregate base subgrade prior to hot mix asphalt paving under standard California public works specs?

• APlus/minus 0.10 foot
• BPlus/minus 0.25 foot
• CPlus/minus 0.05 foot
• DPlus/minus 0.50 foot

When excavating a site with high groundwater, what dewatering method uses a series of small diameter perforated pipes driven around the excavation perimeter connected to a header pipe vacuum pump?

• ASump pit open pumping
• BDeep well turbine pump system
• CElectro-osmosis system
• DWellpoint dewatering system

What is the purpose of proof rolling a completed subgrade with a fully loaded heavy tandem axle dump truck prior to placing base material?

• ADetecting soft yielding spots
• BApplying a final seal coat layer
• CMeasuring soil pH level
• DTesting subgrade color

If a soil sample has a wet weight of 44.0 lbs and a dry weight of 38.0 lbs, what is the moisture content percentage of the soil sample?

• A13.6 percent moisture
• B15.8 percent moisture
• C12.0 percent moisture
• D18.2 percent moisture

What grading operation involves cutting away vegetation, root systems, and organic topsoil before starting major earthwork fills?

• ASubgrade scarification
• BFine grading pass
• CClearing and grubbing
• DBench excavation cut

When excavating fill on steep existing natural hillsides (steeper than 5:1 H:V), what site preparation procedure is required before placing fill lifts?

• ASurface moisture flooding
• BSoil lime injection
• CVibratory compaction pass
• DBench excavation steps

What instrument component on a motor grader allows the blade to be rotated horizontally to cast excavated earth to either side during grading?

• ACircle drive gear assembly
• BRipper tooth shank assembly
• CWheel lean hydraulic cylinder
• DDrawbar hitch pivot pin

What aggregate grading property measures the resistance of aggregate base particles to abrasion and degradation when subjected to mechanical friction?

• AAtterberg liquid limit
• BLos Angeles Rattler test
• CSand Equivalent value
• DCalifornia Bearing Ratio

What is the primary indicator evaluated by the Sand Equivalent (SE) test (California Test 217) performed on aggregate base samples?

• AMaximum particle diameter only
• BSpecific gravity of rock
• CRelative proportion of clay
• DOptimal water percentage

What total vertical height change occurs along a ditch line that extends 320 feet at a continuous downward slope grade of 1.5 percent?

• A3.2 feet drop
• B4.2 feet drop
• C4.5 feet drop
• D4.8 feet drop

When constructing a structural fill using granular soils, why is lift thickness control critical during compactor passes?

• ACompactor depth limit
• BFuel consumption rate
• CBlade wear prevention
• DDust control requirements

What excavation tool attachment on a heavy bulldozer is utilized to fracture hard rock or cemented hardpan soil before scraper loading?

• AAngle blade attachment only
• BRear mounted ripper shank
• CFront loader bucket
• DSide boom crane winch