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BLD-HEAV08-09 · Lesson 3 · 12 clock hours · lab

Rough Grading: Cut, Fill, and Compaction Sequencing

Objective. Students rough-grade a disturbed subgrade area to design elevation tolerances using a dozer or motor grader, then coordinate compaction equipment passes to achieve uniform subgrade density as specified in the site plan notes.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed professional engineer or master tradesperson or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

VoTechWorks program approval and accreditation are still in progress. Credentials are issued only by the certifying bodies named in each program, after their own exams.

What Is Rough Grading?

Rough grading is the first major earthmoving phase on a construction site. Its goal is to move native or disturbed soil to match the design elevations shown on the site plan—within a tolerance acceptable for subsequent work. On most commercial projects that tolerance is ±0.1 ft to ±0.2 ft. Finish grading, paving, and utility installation all depend on a stable, correctly elevated subgrade, so errors made during rough grading compound through every later phase.

Two operations are always paired in rough grading: cutting (removing high material) and filling (placing material in low areas). A well-planned sequence balances the earthwork so hauling distance is minimized and compaction is done in layers rather than all at once on top of a deep fill.

Reading the Site Plan and Setting Grade Stakes

Before any blade touches the ground, you must know where the ground is supposed to be. The site plan provides design elevations—the target finished-subgrade elevation at key points. On this exercise you will set a grid of grade stakes at 25-foot intervals across the training pad using a builder's level and grade rod.

The procedure: set up the level on solid, level ground near the center of the area. Take a backsight on a known benchmark to establish the height of instrument (HI). Then rod each stake location. The difference between HI and the rod reading gives you the existing ground elevation. Subtract the design elevation to get the cut or fill amount. Mark each stake clearly with lumber crayon: C for cut (ground is too high), F for fill (ground is too low), and the depth in tenths of a foot (e.g., C 0.4 or F 0.2).

Double-check your math at two or three stakes before you start the machine. A misread stake can mean re-working a large area.

Cut-and-Fill Sequencing

A logical cut-fill sequence prevents you from pushing material over already-compacted fill and avoids creating haul roads that have to be re-graded. Follow these principles:

1. Work downhill when possible. Gravity helps move material, reduces machine load, and gives better blade control.

2. Strip cut areas first. Remove material from the highest cut zones and winrow it near the adjacent fill zones so haul distance is short.

3. Fill in lifts. Never place fill deeper than the equipment manufacturer and project specification allow in a single lift—commonly 6–8 inches of loose material for general earthfill compacted with a vibratory roller. Thick lifts prevent uniform compaction at the bottom.

4. Check grade stakes every three passes. After three dozer or grader passes, stop and walk the area. Compare blade tracks to stake markings. If you are within 0.1 ft of the stake mark, slow down and reduce blade depth to avoid over-cutting.

5. Protect stake locations. Drive the machine path slightly to the side of each stake so the blade does not destroy it before you have made your final check.

When operating the motor grader, use the blade angle to cast material to one side in a controlled windrow. Adjust the circle (blade rotation) to move material efficiently without spinning the tires. On a track dozer, use short, overlapping pushes and raise the blade just before you reach the fill zone to avoid pushing material past the target.

Compaction Fundamentals

Compaction densifies soil by reducing air voids. Proper subgrade density prevents future settlement that could crack pavement or shift structures. The three factors that control compaction are moisture content, compactive effort (machine weight and vibration), and lift thickness.

For this exercise you will use a vibratory smooth-drum roller or a plate compactor immediately after rough grading each area—do not let freshly placed fill sit overnight before compacting, because moisture can change.

Passes are counted as one complete trip of the drum or plate over the same strip. Overlap each pass by roughly 6 inches to avoid uncompacted seams. The number of passes required will be given to you by the instructor, simulating a project specification. More passes beyond the optimum do not always increase density—they can actually loosen or shear granular soils.

After compaction, test density with a penetrometer. Push the probe into the soil using steady hand pressure and read the resistance value from the scale. Record the reading at each stake location in your field log. Areas that read below the minimum specified value must receive additional compaction passes before you move on.

Safety on the Grading Pad

Spotters and exclusion zones. No person on foot should be within the swing or travel path of any machine. Establish a clear exclusion zone and use a spotter with hand signals or radio when visibility is limited.

PPE. Hard hat, high-visibility vest, safety-toed boots, and eye protection are required at all times on the pad. Wear hearing protection when working near or on vibratory equipment.

Pre-operation inspection. Complete the manufacturer's walk-around checklist before starting any machine. Check blade hardware, tire or track condition, fluid levels, and all lights and alarms.

Rollover and slope hazard. On any slope, travel with the heaviest end of the machine uphill (dozer blade uphill, grader cutting uphill). Never operate across a steep cross-slope beyond the machine's rated stability limit.

Underground utilities. Even on a training pad, call 811 and confirm no buried lines exist before grading. Mark any known utilities with the correct color-coded flags.

Mounting and dismounting. Use three points of contact and never jump from equipment. Set the parking brake and lower the blade to the ground before leaving the seat.

Recording Your Work

Your field log is a legal-quality record. For each stake location record: stake ID, existing elevation, design elevation, calculated cut or fill, actual finished elevation after grading, and penetrometer reading after compaction. Neat, complete entries support your NCCER performance-profile sheets and demonstrate professional practice to any future employer.

Key terms10

Design elevationThe target finished-subgrade elevation at a specific point as shown on the site plan; all cut and fill depths are calculated relative to this number.
Height of instrument (HI)The elevation of the line of sight through a builder's level, calculated by adding the backsight rod reading to the benchmark elevation; used to find existing ground elevations across the site.
CutEarthwork operation that removes material where existing ground elevation is above the design elevation.
FillEarthwork operation that places and compacts material in areas where existing ground elevation is below the design elevation.
LiftA single layer of loose fill material placed before compaction; project specifications control maximum lift thickness to ensure uniform density through the full depth.
Compaction passOne complete trip of a roller or plate compactor drum over the same strip of material; multiple overlapping passes are required to achieve specified density.
PenetrometerA hand-held field instrument that measures soil resistance to penetration; used to quickly check whether compacted subgrade meets the minimum density requirement for the exercise.
WindrowA long ridge of cut material pushed to one side by a blade; used as a staging method to position fill close to where it is needed before final spreading.
Grade stakeA lath stake driven at a grid point and marked with the required cut or fill depth; the primary visual reference for the equipment operator during rough grading.
Exclusion zoneA clearly defined area around operating heavy equipment from which all foot traffic is prohibited to prevent struck-by injuries.

Worked examples4

1. You set up the builder's level and take a backsight on the benchmark. The rod reads 4.82 ft; the benchmark elevation is 100.00 ft. You then rod Stake A and get a reading of 3.14 ft. The design elevation at Stake A is 101.50 ft. Is Stake A a cut or a fill, and by how much?
  1. Step 1 – Calculate HI: HI = benchmark elevation + backsight rod reading = 100.00 + 4.82 = 104.82 ft.
  2. Step 2 – Calculate existing ground elevation at Stake A: existing elevation = HI − foresight rod reading = 104.82 − 3.14 = 101.68 ft.
  3. Step 3 – Calculate cut or fill: difference = existing elevation − design elevation = 101.68 − 101.50 = +0.18 ft. A positive result means the ground is above design, so this is a CUT.
Answer: Stake A requires a CUT of 0.18 ft (approximately 0.2 ft). Mark the stake: C 0.2.
2. Stake B has a foresight rod reading of 6.05 ft using the same instrument setup (HI = 104.82 ft). The design elevation at Stake B is 100.00 ft. Determine cut or fill and depth.
  1. Step 1 – Existing elevation at Stake B: 104.82 − 6.05 = 98.77 ft.
  2. Step 2 – Difference: 98.77 − 100.00 = −1.23 ft. A negative result means the ground is below design, so this is a FILL.
  3. Step 3 – Fill depth needed: 1.23 ft. At a maximum lift of 0.5 ft (6 inches loose), this location will require at least three separate compacted lifts before reaching design grade.
Answer: Stake B requires a FILL of 1.23 ft. Mark the stake: F 1.2. Plan for at least 3 compacted lifts.
3. After rough grading, you check Stake C. Your level rod now reads 4.65 ft at that location (HI still 104.82 ft). The design elevation is 100.30 ft. Is the finished surface within the ±0.2 ft tolerance?
  1. Step 1 – Finished surface elevation: 104.82 − 4.65 = 100.17 ft.
  2. Step 2 – Difference from design: 100.17 − 100.30 = −0.13 ft (0.13 ft low).
  3. Step 3 – Compare to tolerance: |−0.13| = 0.13 ft, which is less than 0.20 ft.
Answer: Stake C is within tolerance—it is 0.13 ft below design elevation, which falls inside the ±0.2 ft acceptable range. No rework required at this stake.
4. You are compacting a fill area. The instructor specifies 6 passes minimum. The drum is 6 ft wide and the fill strip is 30 ft wide. Each pass overlaps the previous by 6 inches (0.5 ft). How many individual lane strips are needed to cover the full 30 ft width?
  1. Step 1 – Effective coverage per strip (drum width minus overlap): 6.0 − 0.5 = 5.5 ft of new ground covered per pass lane.
  2. Step 2 – Number of strips to cover 30 ft: 30 ÷ 5.5 = 5.45, round up to 6 strips.
  3. Step 3 – Total roller passes to complete the full area at 6 passes per strip: 6 strips × 6 passes = 36 total passes of the roller.
Answer: 6 strips are needed; the roller must make 36 total passes to fully compact the 30-ft-wide fill area to specification.

The math in this lesson2

Learners count compaction passes for a 30-foot strip with a 6-foot drum and 6-inch overlap.
6.RP.37.NS.1
In class: Set up a grid of grade stakes at 25-foot intervals across the training pad using a builder's level and rod; calculate cut or fill amounts at each stake from the design elevation on the site plan and mark each stake with cut/fill depth. · Operate the dozer or motor grader to move material from cut areas to fill areas in a logical sequence, checking blade elevation against grade stakes after every three passes; adjust blade angle and travel path as needed to avoid over-cutting. · Follow immediately with a vibratory roller or plate compactor, making the number of passes specified by the instructor (representing a project specification); probe compacted areas with a penetrometer and record readings in the field log, flagging any area below specification for additional passes.
Materials: Motor grader or track dozer, vibratory smooth-drum roller or plate compactor, builder's level and tripod, grade rod, lath stakes, lumber crayon, penetrometer, NCCER HEO L2–L3 performance-profile sheets, site plan with cut/fill quantities, field log notebook, full PPE
Check: Students achieve finished rough grade within ±0.2 ft of design elevation at a minimum of 80% of stake locations; all penetrometer readings meet the minimum value specified for the exercise; field log entries for the session are complete and legible.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

NCCER Heavy Equipment Operations – Grading and Earthwork
1. When you subtract a stake's design elevation from its existing ground elevation and get a positive number, what does that indicate?
NCCER Heavy Equipment Operations – Survey and Grade Control
2. A builder's level backsight on a benchmark reads 3.60 ft. The benchmark elevation is 98.00 ft. What is the height of instrument (HI)?
NCCER Heavy Equipment Operations – Compaction
3. Why must fill material be placed in lifts rather than all at once?
OSHA 10 – Heavy Equipment Safety
4. Which of the following best describes the safe machine travel direction when grading on a slope with a track dozer?
NCCER Heavy Equipment Operations – Compaction
5. After compacting a fill area, several penetrometer readings fall below the minimum specified value. What is the correct next step?
NCCER Heavy Equipment Operations – Grading and Earthwork
6. A finished grade check at a stake shows the surface is 0.22 ft below the design elevation. The project tolerance is ±0.2 ft. What action is required?
NCCER Heavy Equipment Operations – Compaction
7. What is the primary purpose of overlapping each roller pass by approximately 6 inches when compacting a fill strip?
OSHA 10 – Excavation and Underground Hazards
8. Before beginning grading operations on any site—including a training pad—what step must always be taken regarding underground services?
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