On this page (9 sections)
Dig-and-haul is usually faster and costs more per ton. Biological treatment usually takes longer, costs less per unit of soil, and can leave the soil where it is. EPA says excavation gets used where in-place methods would be too slow or too expensive, that it is often the fastest answer to high contamination posing an immediate risk, and that it pays off for small volumes [1]. Biology fits when there is time and the contaminant is one microbes can degrade.
Side by side
| Factor | Dig-and-haul | Biological treatment |
|---|---|---|
| Time | One day to several years, depending on area, depth, and distance to a disposal facility [1]. A federal screening example: 18,200 metric tons in about two months [2]. | A few months to several years [6]. Biopiles run from a few weeks to several months [3]. In-place bioventing can take a few years [5]. |
| Cost | $300 to $510 per metric ton for excavation, transport, and disposal at a permitted facility, per a federal screening matrix [2]. | Roughly $130 to $260 per cubic meter for a biopile treatment bed, excluding the digging [3]. See the cost section below. |
| Disruption | Truck traffic and earth-moving noise for neighbors. Fenced excavations until backfilled [1]. | Contaminated soil stays on site, which reduces truck traffic. Pumps, mixers, and other equipment can still be heard [6]. |
| What happens to the contaminant | Soil is moved to a landfill or an ex situ treatment unit [1]. | Organic contaminants are degraded by microbes into water and gases [6]. |
| Limits | Fugitive emissions during digging, depth, distance to disposal sites, and community resistance to trucking through populated areas [2]. | Not applicable to inorganic contaminants [8]. Slower in cold weather [8]. Harder to verify that contaminants were destroyed [7]. |
Reading the published costs
The federal cost figures use different units and cover different scopes, so compare them carefully.
| Method | Published figure | What the figure covers | Source |
|---|---|---|---|
| Excavation and off-site disposal | $300 to $510 per metric ton | Excavation, transport, and disposal at a RCRA-permitted facility. Extra treatment to meet land disposal rules may add cost. | FRTR [2] |
| Biopile | $130 to $260 per cubic meter ($30 to $60 per cubic yard) | Treatment with a prepared bed and liner. The soil must still be excavated first. | FRTR [3] |
| Landfarming | Under $100 per cubic meter (under $75 per cubic yard); lab studies $25,000 to $50,000; pilot tests under $100,000 | Prepared-bed treatment. Source cites year-2000 publication data. | FRTR [4] |
| Aerobic bioventing | About $50 per cubic yard | In-place air delivery for fuels. Source cites a 1996 Air Force study. | EPA [5] |
Before anyone quotes these numbers:
- The figures are old and unadjusted, some tracing to 1996 and 2000 data, so they are useful for comparing methods with each other and a real project still needs current quotes.
- The scopes differ, since the excavation figure includes hauling and disposal while the biopile figure leaves out digging the soil up, and the in-place figures leave out years of monitoring.
- The units differ as well, so for a rough comparison, assume about 1.5 metric tons of soil per cubic meter (our assumption; real soils vary). That puts the biopile range at about $85 to $175 per metric ton before excavation, against $300 to $510 for dig-and-haul.
No current published comparison holds across every site. Use these as a starting point and price your own.
Time
Digging is quick when the volume is modest. It slows when the area is large or deep, the soil sits below the water table, high concentrations call for extra safety steps, buildings limit equipment, or the disposal facility is far away [1]. At the Federal Creosote Superfund site in New Jersey, crews dug as deep as 35 feet between 2002 and 2008, trucked 275,000 tons offsite from an area near 93 homes, and demolished 18 homes to reach the soil underneath [1].
Biology starts slower, and its clock depends on the contaminant. EPA’s public guide says cleanup takes longer with high concentrations, contamination in dense or hard-to-reach soil, a large or deep area, conditions that need adjusting, or treatment above ground [6]. FRTR notes that dug-up soil treated above ground generally finishes sooner than soil treated in place [7]. The ranges are laid out in how long soil bioremediation takes.
Disruption, and where the soil ends up
Excavation brings trucks, dust control and air monitoring. EPA describes workers watching for dust and vapors, washing truck tires before they leave, and covering soil piles with tarps or foam [1]. FRTR counts community resistance to trucking contaminated material through neighborhoods as a limitation [2]. Clean fill comes back in to replace what leaves [1].
Digging on its own destroys nothing, because the soil simply goes to a landfill or a treatment facility [1]. It can also be treated on site, and EPA notes the treated soil can then go back into the excavation [1].
Where biology does not fit
Metals are the clearest case where biology falls short, since bioremediation is not applicable to inorganic contaminants [8], so a lead-contaminated lot needs removal, stabilization or capping. FRTR also warns that some compounds break down into more toxic by-products and that chlorinated contaminants degrade slowly [8]. Our contaminant fit chart sorts which compounds suit biology.
Biology can also stall, and a project that is not showing degradation should have a fallback agreed in advance, and that may mean excavating the hot spots.
A decision matrix
This is our reading of the EPA and FRTR statements above, not a rule.
| Your situation | Leans toward |
|---|---|
| Small volume, very high concentration, or an immediate risk to people | Excavation [1] |
| Large volume of moderately contaminated soil with organic compounds, and time to work | Biology, in place or on site [6] |
| Metals or other inorganic contaminants | Removal or stabilization. Biology is not applicable [8] |
| Tight redevelopment schedule | Excavation, or a hybrid |
| Neighbors and truck routes are a constraint | Biology in place, or treatment on site [1][6] |
| Mixed contaminants | A hybrid: excavate the hot spots, treat the remainder |
Many projects combine the two methods: excavation takes the worst spots and anything biology cannot touch, and biology works through the larger, lower-concentration remainder.
Where Elm Dirt fits
We make living-soil biological products and work directly with applicators. Where a site needs excavation or another engineered remedy, biology does not replace it, and we would rather lose that project than oversell. For organic contamination at moderate levels, with time and a sampling plan, biology is worth pricing against excavation. Biome Makers, an independent lab, identified 291 microbial species in our Plant Juice. We plan on months to a year or more, with progress checked by independent lab testing.
Pricing your own site
The ranges above come from federal compilations. The comparison that counts needs a volume estimate, a disposal quote and a treatability result for your soil, and we can help you put those together. Ask us about your site.
Sources
- U.S. EPA. A Citizen’s Guide to Excavation of Contaminated Soil. EPA 542-F-12-007, September 2012. Link. Accessed 2026-10-01.
- Federal Remediation Technologies Roundtable. Remediation Technologies Screening Matrix, section 4-28: Excavation, Retrieval, and Off-Site Disposal. Link. Accessed 2026-10-01.
- Federal Remediation Technologies Roundtable. Remediation Technologies Screening Matrix, section 4-11: Biopiles. Link. Accessed 2026-10-01.
- Federal Remediation Technologies Roundtable. Remediation Technologies Screening Matrix, section 4-13: Landfarming. Link. Accessed 2026-10-01.
- U.S. EPA. Engineering Issue: In Situ and Ex Situ Biodegradation Technologies for Remediation of Contaminated Sites. EPA/625/R-06/015, October 2006. Link. Accessed 2026-10-01.
- U.S. EPA. A Citizen’s Guide to Bioremediation. EPA 542-F-12-003, September 2012. Link. Accessed 2026-10-01.
- Federal Remediation Technologies Roundtable. Remediation Technologies Screening Matrix, section 3.4: Ex Situ Biological Treatment for Soil, Sediment, and Sludge. Link. Accessed 2026-10-01.
- Federal Remediation Technologies Roundtable. Remediation Technologies Screening Matrix, section 3.1: In Situ Biological Treatment for Soil, Sediment, and Sludge. Link. Accessed 2026-10-01.