When the cut-and-fill earthwork calculation shows a net surplus or deficit, soil must be hauled off-site or brought in. Hauling is often the single largest line item in a grading budget, sometimes exceeding the cost of the earthwork itself. The cost depends on the volume, the haul distance, truck availability, disposal or purchase fees, and whether the material is clean fill or contaminated. Getting the estimate right during design saves the owner from a budget surprise during construction.
Understanding Soil Volume Conversions
Earthwork volumes are measured in three states, and you must use the correct state when estimating haul costs:
| State | Definition | Typical Factor |
|---|---|---|
| Bank (in-place) | Undisturbed soil in the ground | 1.00 (reference) |
| Loose | Soil after excavation, expanded by air voids | 1.20 to 1.35 (20-35% swell) |
| Compacted | Soil after placement and compaction | 0.85 to 0.95 (5-15% shrinkage) |
Truck Types and Capacities
| Truck Type | Capacity (Loose CY) | Legal Payload (Tons) | Common Use |
|---|---|---|---|
| Single-axle dump truck | 5-8 | 10-13 | Small sites, tight access |
| Tandem-axle dump truck | 10-14 | 18-22 | Most common for earthwork |
| Transfer dump (truck + pup) | 20-26 | 28-35 | Long hauls, highway travel |
| Semi end-dump (belly dump) | 18-24 | 25-30 | Large sites, long hauls |
| Super dump (7-axle) | 16-20 | 26-28 | Urban hauling where bridge laws limit weight |
Cost Components
Trucking Cost
Trucking is typically quoted per hour or per ton-mile. Current market rates (2025-2026) for tandem-axle dump trucks range from $85 to $150 per hour, depending on the region and fuel costs. For estimating, calculate the cycle time per load:
Cycle Time = Load Time + Haul Time + Dump Time + Return Time + Wait Time
- Load time: 5 to 10 minutes for a loader or excavator to fill a tandem dump truck
- Haul time: Distance / average speed. Assume 25-35 mph for urban routes, 45-55 mph for highway routes
- Dump time: 2 to 5 minutes
- Return time: Same as haul time (empty return is slightly faster)
- Wait time: 5 to 15 minutes per cycle for queuing, weigh scale, and traffic delays
Worked Example
Export 8,000 bank CY of soil from a site in an urban area. The disposal site is 15 miles away.
- Loose volume: 8,000 x 1.25 = 10,000 LCY
- Loads (tandem at 12 LCY/load): 10,000 / 12 = 834 loads
- Cycle time: 8 min load + 30 min haul + 3 min dump + 28 min return + 10 min wait = 79 min = 1.32 hours
- Truck cost: $120/hour x 1.32 = $158 per load
- Total trucking: 834 loads x $158 = $131,772
- Cost per bank CY: $131,772 / 8,000 = $16.47/BCY for trucking alone
Disposal or Purchase Fees
In addition to trucking, there is a fee to dump soil at a disposal site or purchase soil from a supplier:
- Clean fill disposal: $3 to $8 per ton ($5 to $14 per CY). Some sites accept clean fill for free if they need fill material.
- Contaminated soil disposal: $25 to $75+ per ton depending on contamination level. Requires profiling (soil testing) before the facility will accept it.
- Import fill purchase: $8 to $20 per ton for engineered fill. Topsoil is $20 to $40 per ton. Class 2 aggregate base is $15 to $30 per ton.
Factors That Drive Cost Up
- Long haul distances. Every additional mile adds approximately $1 to $3 per cubic yard in trucking cost. A 30-mile haul can double the cost compared to a 10-mile haul.
- Contaminated soil. Soil with petroleum hydrocarbons, heavy metals, or other contaminants must go to a licensed disposal facility. Testing, profiling, manifesting, and elevated disposal fees can add $30 to $100+ per cubic yard on top of trucking.
- Small quantities. Mobilization costs for trucking companies are relatively fixed. Hauling 200 CY costs almost as much per yard as hauling 2,000 CY because the logistics overhead is similar.
- Urban sites with limited access. If only single-axle trucks can access the site, each load carries half the volume of a tandem, doubling the number of loads.
- Peak construction season. Truck availability is limited during summer months. Rates increase 10 to 20 percent during peak demand.
Strategies to Reduce Haul Costs
- Balance cut and fill on site. The best haul cost is zero. Adjust pad elevations, retaining wall heights, and grading design to minimize the net import or export. Even a 6-inch pad elevation adjustment over a large site can eliminate thousands of cubic yards of hauling.
- Find a nearby borrow or disposal site. A construction project within a few miles that needs fill (or has excess cut) can be a free or low-cost exchange. Check with local contractors and the jurisdiction for active projects nearby.
- Use on-site soil for non-structural fill. Not all fill needs to meet engineered fill specifications. Landscape areas, berms, and non-load-bearing areas can often use native soil that would otherwise be exported.
- Phase the earthwork. If the project builds in phases, stockpile excess cut from Phase 1 on the Phase 2 area for later use, avoiding a double haul.
- Consider soil amendments. Expansive or unsuitable native soil can sometimes be stabilized with lime, cement, or fly ash treatment rather than removing and replacing it with imported fill. The treatment cost ($3 to $8 per CY) is often less than the combined cost of export and import.
Environmental and Permitting Considerations
Hauling soil requires attention to several regulatory requirements. The SWPPP (Stormwater Pollution Prevention Plan) must address erosion control during excavation and stockpiling. If soil is contaminated, a soil management plan and agency notification may be required. Truck routes through residential areas may require a haul route permit from the city, with restrictions on hours of operation, truck size, and speed. Weigh stations and bridge laws limit legal payload weights on public roads. All of these constraints affect the logistics and cost of hauling, and they should be addressed during design, not discovered during construction.
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