CSLB C-12 Earthwork and Paving (Trade Exam) — All Questions

Which task is within the C-12 definition as the Board words it?

• a.Installing guard rails and wheel stops on a lot
• b.Fabricating and installing water pipelines
• c.Forming and finishing structural concrete walls
• d.Placing paving and other surfacing materials✓

The definition includes "the mixing, fabricating and placing of paving and any other surfacing materials." Guard rails and vehicle stops appear in the C-32 definition, fabricating and installing pipelines is the C-34 definition (with its own incidental trenching and paving), and forming and finishing concrete is the C-8 definition.CSLB C-12 classification text (16 CCR Div. 8, Art. 3)

A site plan is drawn at 1 inch = 20 feet. A loading apron measures 4-1/2 inches on the sheet. How long is the apron?

• a.90 feet✓
• b.45 feet
• c.9 feet
• d.180 feet

Each inch is 20 feet, so 4.5 × 20 = 90 feet. Forty-five feet is the result at 1 inch = 10 feet, 9 feet shifts the decimal point, and 180 feet uses 40 feet per inch.CSLB C-12 study guide 13E-12 (computation questions)

Which sheet of a paving plan set shows the pavement layers and their thicknesses?

• a.The erosion-control plan
• b.The typical section✓
• c.The utility plan
• d.The traffic-control plan

The typical section shows the pavement structure as layers (surface, base, subbase) with thicknesses and cross slope. The utility plan locates pipes and cables, the traffic-control plan stages lane closures and detours, and the erosion-control plan shows the stormwater measures.Plan-reading practice; Caltrans 2024 Standard Specifications §26-1.03D (layer thickness)

A profile shows a finish grade rising 3.6 feet over 240 feet. What is the grade?

• a.66.7 percent
• b.15 percent
• c.1.5 percent✓
• d.0.015 percent

Grade is rise over run times 100: 3.6 ÷ 240 = 0.015, which is 1.5 percent. Fifteen percent shifts the decimal, 66.7 percent inverts the ratio, and 0.015 percent reports the decimal as if it were already a percent.Plan-reading practice (percent grade)

Before an excavation begins, what does the Cal/OSHA excavation order require about notice to utility owners?

• a.Notice at least 5 calendar days before digging
• b.Notice when the trench is deeper than 5 feet
• c.Notice at least 2 working days before digging✓
• d.Notice within 2 working days after digging begins

The excavator must advise the regional notification center and known owners at least 2 working days before the start of digging, and must have positive responses from the known owner-operators. Notice after digging begins defeats the purpose, 5 calendar days is longer than the stated period, and a depth of 5 feet does not decide whether notice is needed.8 CCR §1541(b)(2)

Excavation is proposed within 10 feet of a high-pressure natural gas pipeline operating above 60 psig. What does the order require?

• a.Digging at night while the line pressure is reduced
• b.Machine potholing at the line, which is accepted as verification
• c.A repeat of the 2-working-day notice sent to the pipeline owner
• d.An on-site meeting with the owner-operator to verify the location✓

A pipeline above 60 psig is a high priority installation, so an on-site meeting with the owner-operator is required to determine the action needed to verify its location. Repeating the 2-working-day notice is not a substitute for the meeting, digging at night while the pressure is lowered is not a rule in the order, and machine potholing is not the verification method the order describes.8 CCR §1541(b)(1)(B)

A crew will work a loader near an energized 20,000-volt overhead line. What is the general minimum clearance for equipment and the body of an employee?

• a.10 feet
• b.6 feet✓
• c.16 feet
• d.20 feet

For voltages from 600 up to 50,000, the general clearance is 6 feet. Ten feet applies to boom-type equipment and storage in that band (and to the general table above 50,000 volts), 16 feet is for lines above 345,000 volts, and 20 feet is for lines above 750,000 volts.8 CCR §2946, Table 1

A plumber must go down into a 6-foot-deep trench to set pipe. What does Cal/OSHA require of the employer before the trench is dug?

• a.A permit, annual or project-specific, before digging✓
• b.A permit if the trench is wider than 15 feet
• c.A permit for emergency repairs
• d.A permit requested after the trench has been inspected

Trenches or excavations 5 feet or deeper into which a person is required to descend need an annual or project permit. Twenty feet is the engineer-design threshold for sloping, not a permit threshold, so being under it gives no exemption; a 15-foot width does not decide the permit; emergency repair of underground facilities is an exception rather than the trigger; and a permit requested after inspection comes too late because the permit is needed before the trench is dug.8 CCR §341(d)(5), §341(e)

A road base is 900 feet long, 20 feet wide and 6 inches thick after compaction. The base weighs 1.7 tons per cubic yard. About how many tons are needed?

• a.1,134 tons
• b.567 tons✓
• c.333 tons
• d.6,800 tons

The volume is 900 × 20 × 0.5 = 9,000 cubic feet = 333.3 cubic yards, and 333.3 × 1.7 = 567 tons. The 333-ton figure stops at cubic yards, 1,134 doubles the depth, and 6,800 uses 6 feet for the thickness instead of 0.5 foot.CSLB C-12 study guide 13E-12 (computation questions)

A 1,800 bank cubic yard excavation swells 30%. Trucks haul 13 loose cubic yards per load. How many loads are needed?

• a.180 loads✓
• b.234 loads
• c.2,340 loads
• d.139 loads

Loose volume is 1,800 × 1.30 = 2,340 loose yards, and 2,340 ÷ 13 = 180 loads. The 139 loads forgets swell, 234 divides by 10 instead of the truck size, and 2,340 is the loose volume rather than the number of loads.Estimating practice (swell factor)

An embankment needs 6,000 compacted cubic yards. The borrow compacts to 0.80 compacted cubic yard for each bank cubic yard. How many bank cubic yards must be dug?

• a.6,000
• b.7,500✓
• c.4,800
• d.7,800

Bank yards needed = 6,000 ÷ 0.80 = 7,500. Multiplying by 0.80 gives 4,800 and gets the direction wrong, 6,000 ignores the shrinkage, and 7,800 has no basis in the factor.Estimating practice (shrinkage factor)

A parking area of 25,000 square feet is paved with a compacted 0.20-foot course of hot mix weighing 145 pounds per cubic foot. How many tons of mix?

• a.181.3 tons
• b.36.25 tons
• c.362.5 tons✓
• d.725.0 tons

Volume = 25,000 × 0.20 = 5,000 cubic feet; weight = 5,000 × 145 = 725,000 pounds; tons = 725,000 ÷ 2,000 = 362.5. Dividing by 1,000 gives 725, halving the thickness gives 181, and shifting the decimal gives 36.3.Estimating practice (tons from area, thickness and unit weight)

A 6,000-square-yard planed pavement receives tack coat at a minimum residual rate of 0.05 gallon per square yard. How many gallons of residual asphalt are required?

• a.300 gallons✓
• b.600 gallons
• c.120 gallons
• d.180 gallons

6,000 × 0.05 = 300 gallons of residual asphalt. The 120 and 180 gallon figures use the rates for new hot mix (0.02) and for existing asphalt or concrete (0.03), and 600 gallons doubles the correct result.Caltrans 2024 Standard Specifications §39-2.01C(3)(f)

A job costs $150,000 and the estimator adds a 20 percent markup on cost. What is the profit margin on the selling price?

• a.80.0 percent
• b.20.0 percent
• c.16.7 percent✓
• d.25.0 percent

The price is $150,000 × 1.20 = $180,000 and the profit is $30,000, so the margin is 30,000 ÷ 180,000 = 16.7 percent. Twenty percent is the markup on cost, 25 percent inverts the relation, and 80 percent is the cost share of the price.Estimating practice (markup versus margin)

A level is read at 3.18 feet on a benchmark of elevation 212.50 feet. What is the height of instrument?

• a.215.50 feet
• b.215.68 feet✓
• c.3.18 feet
• d.209.32 feet

HI = benchmark elevation + backsight = 212.50 + 3.18 = 215.68 feet. Subtracting the backsight gives 209.32, 3.18 is only the rod reading, and 215.50 is an arithmetic slip.Surveying practice (leveling)

A road segment runs from STA 22+40 to STA 29+15. How long is it?

• a.775 feet
• b.5,155 feet
• c.675 feet✓
• d.6.75 feet

Subtract station values in feet: 2,915 − 2,240 = 675 feet. A reading of 6.75 treats the stations as if they were hundreds, 775 slips by 100 feet, and 5,155 adds the stations.Surveying practice (stationing)

Existing ground at a stake is 101.45 feet and the finish grade is 100.20 feet. What does the stake read?

• a.Fill 0.25 foot
• b.Cut 1.25 feet✓
• c.Fill 1.25 feet
• d.Cut 2.25 feet

The finish is below the ground, so material is removed: 101.45 − 100.20 = 1.25 feet of cut. Calling it fill reverses the sign, and 2.25 and 0.25 are arithmetic slips.Surveying practice (cut and fill)

Which minimum R-value does the State specification require for Class 2 aggregate base?

• a.35
• b.50
• c.22
• d.78✓

Class 2 aggregate base requires a minimum R-value of 78 for contract compliance. Fifty is the Class 3 minimum, 35 is the minimum durability index, and 22 is the minimum sand equivalent.Caltrans 2024 Standard Specifications §26-1.02B

Under method compaction, which machine is the breakdown roller?

• a.A steel-tired two-axle tandem roller
• b.A vibratory roller of at least 7.5 tons✓
• c.A sheepsfoot roller used on soil subgrade
• d.An oscillating pneumatic-tired roller at least 4 feet wide

The breakdown roller is a vibratory roller designed to compact hot mix, at least 7.5 tons and capable of at least 2,500 vibrations per minute. The pneumatic roller is the intermediate roller, the steel tandem is the finish roller, and a sheepsfoot roller is a soil-compaction drum.Caltrans 2024 Standard Specifications §39-2.01C(2)(c)

Which binder grade does the State specification require for replacing asphalt concrete surfacing?

• a.PG 70-10 or PG 76-22
• b.PG 64-10 or PG 64-16✓
• c.PG 58-16 or PG 64-22
• d.PG 52-34 or PG 58-28

Replacement HMA uses PG 64-10 or PG 64-16 asphalt binder. The other grades are real binder grades but are not the ones this section specifies.Caltrans 2024 Standard Specifications §39-3.02B

A State specification calls for 0.35 foot of aggregate base. What thickness is that in inches?

• a.4.2 inches✓
• b.3.5 inches
• c.0.42 inch
• d.35 inches

Multiply feet by 12: 0.35 × 12 = 4.2 inches. Reading 0.35 foot as 3.5 inches moves the decimal point, 0.42 inch drops a factor of ten, and 35 inches treats the foot value as inches times 100.Caltrans 2024 Standard Specifications §26-1.03 (thickness stated in feet)

A route runs from STA 7+25 to STA 11+80. What is its length?

• a.4.55 feet
• b.455 feet✓
• c.355 feet
• d.1,905 feet

Stations are in feet: 1,180 − 725 = 455 feet. Reading the difference of the station numbers as 4.55 feet ignores the 100-foot station, 1,905 adds the stations, and 355 subtracts incorrectly.Surveying practice (stationing)

Under the State earthwork specification, where concrete base or pavement is to be placed, how must the grading plane be prepared?

• a.It must not extend above the established grade✓
• b.It must be at least 0.10 foot below the grade everywhere
• c.It must be within 0.05 foot above or below the grade
• d.It may be up to 0.10 foot above the grade

Under concrete base or pavement the grading plane may not extend above the established grade, because a high spot would reduce the slab thickness. The plus-or-minus 0.05 foot tolerance is for asphalt, 0.10 foot above applies only to base paid by the ton, and a mandatory 0.10-foot depression is not stated.Caltrans 2024 Standard Specifications §19-1.03C

Aggregate base is paid by weight. Which deduction does the State specification make from the weighed tons?

• a.The weight of all water present in the load when weighed
• b.Water above optimum moisture plus 1 percent✓
• c.The tare weight of the haul truck's tires and bed
• d.A flat 5 percent deduction for moisture

When base is paid by weight the engineer deducts the weight of water in excess of the optimum moisture content plus 1 percent. Deducting all water would remove the moisture the compacted base needs, truck tare is not part of the weighed load, and a flat percentage ignores the actual moisture in the load.Caltrans 2024 Standard Specifications §26-1.04

On a grading plan, contour lines that are drawn very close together indicate which condition?

• a.A drainage inlet
• b.Steep ground✓
• c.Flat ground
• d.A change in soil type

Closely spaced contours mean the elevation changes quickly over a short distance, which is steep ground. Flat ground has widely spaced contours, a drainage inlet is shown by a structure symbol, and soil type is not shown by contour spacing.Plan-reading practice (contours)

Which statement about the construction stormwater permit is correct?

• a.Sites disturbing one or more acres of land, or part of a larger common plan disturbing more than one acre✓
• b.Sites disturbing more than 10 acres, or part of a larger plan disturbing more than 40 acres of land
• c.Sites that discharge stormwater directly to the ocean, a lake or a bay
• d.Asphalt paving operations on sites larger than one acre in total area

The order covers sites disturbing one or more acres of land surface and smaller sites that are part of a larger common plan that disturbs more than one acre, for clearing, grading and excavation as well as paving. The 10-acre threshold, a paving-only scope and an ocean-drainage limit are not in the order.SWRCB Order WQ 2022-0057-DWQ (applicability)

A soil report finds groundwater 4 feet below the ground surface on a site that will have 8-foot trenches. What is the main planning consequence?

• a.Higher haul costs, with trench-safety cost unchanged
• b.Dewatering and trench-safety costs must both be priced✓
• c.The trenches can be dug at a steeper slope
• d.The utility notice period is shortened

Groundwater in an 8-foot trench means water accumulation, submerged Type C soil, dewatering and added protective-system cost. Higher haul cost is not the consequence because trench-safety cost does change, water does not allow steeper slopes (submerged soil is Type C at 1-1/2:1), and it has no effect on the utility notice period.8 CCR §1541(h); Appendix A soil classification

A street closure for pipe work will change how traffic moves. If local authorities regulate traffic, how far ahead does the State specification require notice?

• a.At least 30 calendar days before the work begins
• b.At least 24 hours before job site activities start
• c.Notice is required after a complaint is received
• d.At least 5 business days before activities start✓

The specification requires notifying local authorities at least 5 business days before the start of job site activities. Twenty-four hours is the notice for seal-coat parking restrictions, 30 days is longer than the specification states, and notice after a complaint comes too late to be notice at all.Caltrans 2024 Standard Specifications §12-4.01A

A backhoe cuts a natural gas line operating at 100 psig (a high priority installation) and gas escapes. Which action is required?

• a.Immediately notify 911 and the owner-operator✓
• b.Cover the nick with tape and keep digging
• c.Wait for the next daily inspection to report it
• d.Notify the owner-operator at the end of the shift

If damage to a high priority installation releases flammable gas or endangers life, health or property the excavator must immediately notify 911, and must notify the facility owner-operator or the regional notification center. Taping, end-of-shift notice and waiting for an inspection all delay the response.8 CCR §1541(b)(5)

Which two conditions must both be met before an excavation may start?

• a.The area is marked and positive responses are received from all known owner-operators✓
• b.The weather forecast is dry and a street sweeper is on site for tracking
• c.The trench is under 5 feet deep and the competent person classifies the soil Type A
• d.The daily inspection log is signed and the permit fee has been paid in full

The order says excavation may not commence until the area is marked and the excavator has positive responses from the known owner-operators of subsurface installations within the project. Depth, soil type, logs, fees, forecasts and sweepers are other topics.8 CCR §1541(b)(1)(A)

A sidewalk 400 feet long, 4 feet wide and 4 inches thick will be poured. Allow 10 percent waste. How many cubic yards of concrete should be ordered?

• a.20 cubic yards
• b.22 cubic yards✓
• c.21 cubic yards
• d.59 cubic yards

The volume is 400 × 4 × (4 ÷ 12) = 533.3 cubic feet = 19.75 cubic yards, and with 10% waste 21.7, which is ordered as 22. Twenty omits the waste, 59 uses a 12-inch thickness, and 21 rounds down a quantity that is being ordered.Estimating practice (flatwork quantity)

A loader has a 3-cubic-yard bucket, a 30-second cycle and a 50-minute working hour. How many hours does it take to load 2,400 loose cubic yards?

• a.16 hours
• b.6.7 hours
• c.8 hours✓
• d.10 hours

Cycles per hour = (3,600 ÷ 30) × (50 ÷ 60) = 100, so production is 100 × 3 = 300 loose yards per hour, and 2,400 ÷ 300 = 8 hours. Using a full 60-minute hour gives 6.7 hours, and 10 and 16 hours come from halving the production or the bucket size.Estimating practice (production)

Cross-section areas of 120 square feet and 180 square feet occur at stations 100 feet apart. What is the volume between them by the average-end-area method?

• a.About 15,000 cubic yards
• b.About 444 cubic yards
• c.About 1,111 cubic yards
• d.About 556 cubic yards✓

The average area is 150 square feet, times 100 feet is 15,000 cubic feet, and 15,000 ÷ 27 = 556 cubic yards. The 444 figure uses only the smaller area, 1,111 adds the areas instead of averaging, and 15,000 leaves the answer in cubic feet.Caltrans 2024 Standard Specifications §19-6.03B (average end areas)

An excavation produces fill that compacts to 0.90 compacted cubic yard per bank cubic yard. The job needs 10,000 compacted cubic yards from borrow that swells 25 percent when dug. How many loose cubic yards must be hauled?

• a.About 13,889✓
• b.About 9,000
• c.About 12,500
• d.About 11,111

Bank yards = 10,000 ÷ 0.90 = 11,111, and loose yards = 11,111 × 1.25 = 13,889. The 12,500 figure applies swell without the shrinkage conversion, 11,111 stops at bank yards, and 9,000 multiplies by the shrinkage factor.Estimating practice (bank, loose and compacted volumes)

Direct cost is $400,000. Overhead is 12 percent of direct cost, and profit is 10 percent of cost plus overhead. What is the bid?

• a.$440,000
• b.$492,800✓
• c.$488,000
• d.$448,000

Cost with overhead is $448,000, and 10 percent profit on that is $44,800, so the bid is $492,800. Adding 12 and 10 percent to $400,000 gives $488,000, $448,000 omits profit, and $440,000 applies only the profit to the direct cost.Estimating practice (overhead and profit)

A parking lot is 150 feet by 80 feet and will receive 6 inches of aggregate base. About how many cubic yards of base are needed in place?

• a.444 cubic yards
• b.111 cubic yards
• c.222 cubic yards✓
• d.6,000 cubic yards

Area = 12,000 square feet, volume = 12,000 × 0.5 = 6,000 cubic feet, and 6,000 ÷ 27 = 222 cubic yards. Using 12 inches gives 444, using 3 inches gives 111, and 6,000 leaves the answer in cubic feet.Estimating practice (prism volume)

A site is 3.5 acres. How many square feet is that?

• a.15,246 square feet
• b.130,680 square feet
• c.174,240 square feet
• d.152,460 square feet✓

One acre is 43,560 square feet, and 3.5 × 43,560 = 152,460. The 130,680 figure is 3 acres, 174,240 is 4 acres, and 15,246 shifts the decimal point.Estimating practice (unit conversion)

A chip seal covers 8,000 square yards with 3/8-inch aggregate spread at 22 pounds per square yard. How many tons of aggregate are needed?

• a.176 tons
• b.4,400 tons
• c.88 tons✓
• d.8.8 tons

8,000 × 22 = 176,000 pounds, and 176,000 ÷ 2,000 = 88 tons. The 176 figure divides by 1,000 instead of 2,000, 8.8 shifts the decimal, and 4,400 divides by 40.Caltrans 2024 Standard Specifications §37-2.02C(3) (aggregate spread rates)

A level reads 4.62 feet at a stake. The instrument height is 96.30 feet. What is the ground elevation at the stake?

• a.96.30 feet
• b.100.92 feet
• c.91.68 feet✓
• d.4.62 feet

Ground elevation = HI − foresight = 96.30 − 4.62 = 91.68 feet. Adding the reading gives 100.92, and the other two are the rod reading and the HI themselves.Surveying practice (leveling)

A road cut is 6 feet deep at the centerline with 2:1 cut slopes and a 30-foot-wide finished roadbed. How far from the centerline is the catch point at the top of the cut on level ground?

• a.27 feet✓
• b.21 feet
• c.12 feet
• d.33 feet

Catch point = half the width + depth × slope ratio = 15 + 6 × 2 = 27 feet. Twelve feet counts only the slope run, 21 uses a 1:1 slope, and 33 uses a 3:1 slope.Surveying practice (slope staking)

Two curb stakes 25 feet apart have finish elevations 150.00 and 150.50 feet. What is the grade?

• a.1.0 percent
• b.0.5 percent
• c.20 percent
• d.2.0 percent✓

Rise 0.50 foot over a run of 25 feet is 0.02, which is 2.0 percent. Half a percent uses the rise as the percent, 20 percent shifts the decimal, and 1.0 percent uses a 50-foot run.Surveying practice (grade between stakes)

The instrument height is 92.15 feet and finish grade at a stake is 87.60 feet. What rod reading shows that the rod bottom is at finish grade?

• a.4.45 feet
• b.179.75 feet
• c.4.55 feet✓
• d.87.60 feet

Rod reading = HI − design elevation = 92.15 − 87.60 = 4.55 feet. Adding gives 179.75, 4.45 is an arithmetic slip, and 87.60 is the design elevation.Surveying practice (setting grade)

Which practice best protects against a wrong height of instrument spreading through a layout?

• a.Trust the first rod reading of the day
• b.Use a single benchmark so every reading is consistent
• c.Close the level loop on a second known benchmark of elevation✓
• d.Stake from the machine's control model alone

Closing a loop on a second known benchmark exposes an error in the first setup before it is built into the work. A single benchmark cannot check itself, a machine model reproduces whatever reference it is given, and trusting an unchecked first reading is how errors propagate.Surveying practice (loop closure)

Why are offset stakes set at a known distance from the true point?

• a.They replace the benchmark for the whole project
• b.They cost less than hubs and need no guard stakes
• c.They survive construction and still carry the grade information✓
• d.They mark the exact finished edge of pavement afterward

Machines destroy stakes at the true point, so an offset stake carries the station, offset distance and cut or fill to a position that survives. Cost, marking finished pavement and replacing a benchmark are not their purpose.Surveying practice (offset stakes)

Which minimum durability index applies to Class 2 aggregate base under the State specification?

• a.35✓
• b.22
• c.50
• d.78

Class 2 aggregate base requires a minimum durability index of 35 (R-value 78, sand equivalent 22). Fifty is the Class 3 R-value minimum.Caltrans 2024 Standard Specifications §26-1.02B

Minor concrete for curbs and sidewalks must contain at least how much cementitious material?

• a.300 pounds per cubic yard
• b.463 pounds per cubic yard✓
• c.505 pounds per cubic yard for all curbs
• d.600 pounds per cubic yard

Minor concrete contains at least 463 pounds of cementitious material per cubic yard; 505 applies to extruded or slip-form curb with 3/8-inch maximum aggregate. Three hundred pounds is below the minimum, 600 pounds is not a stated value, and 505 applies to only one kind of curb rather than all curbs.Caltrans 2024 Standard Specifications §73-1.02A

What is the minimum overlap of adjacent edges of geosynthetic material under aggregate base?

• a.2 feet✓
• b.6 inches
• c.3 feet
• d.1 foot

Adjacent edges and roll ends overlap at least 2 feet; a repair patch overlaps at least 3 feet. Six inches and 1 foot are less than the minimum.Caltrans 2024 Standard Specifications §26-1.03C

A distributor truck for tack coat must be able to apply within which range?

• a.0.5 to 5 gallons per square yard at 5 to 10 psi
• b.0.001 to 0.01 gallon per square yard at 25 psi
• c.0.02 to 1 gallon per square yard at 25 to 75 psi pressure✓
• d.One fixed rate near 0.10 gallon per square yard

The State specification requires a distribution system capable of 0.02 to 1 gallon per square yard at 25 to 75 psi and within 0.02 gallon of the set rate. A fixed rate or the other ranges would not cover tack, chip seal and fog seal needs.Caltrans 2024 Standard Specifications §37-1.03B

Which tire pressure is the minimum for the pneumatic intermediate roller in a hot mix compaction train?

• a.100 psi
• b.30 psi
• c.15 psi
• d.60 psi✓

The pneumatic-tired intermediate roller is at least 4 feet wide with tires inflated to 60 psi minimum. The 100 psi figure belongs to the chip seal rollers, and 30 and 15 psi are below the minimum.Caltrans 2024 Standard Specifications §39-2.01C(2)(c)

What is the purpose of a material transfer vehicle in paving?

• a.It remixes the mix and feeds the paver continuously without stopping✓
• b.It cools the mix before it reaches the paver hopper
• c.It compacts the mix behind the screed with vibratory rollers
• d.It applies the tack coat ahead of the paver's screed

A material transfer vehicle receives hot mix, remixes it with augers and transfers it to the paver's hopper so paving can be continuous. Compaction is the rollers' job, tack is applied by a distributor, and cooling the mix is the opposite of the goal.Caltrans 2024 Standard Specifications §39-2.01C(2)(b)