What are typical unit treatment costs in $ per cubic yard?
As low as $70/cy for large and deep CVOC sites - less in some cases - increasing for smaller sites and about double the unit cost for SVOC sites. Groundwater presence and flow is important - the drier the soil, the cheaper the treatment. Shallow and small sites are more expensive per unit volume to treat in situ.
How long does it take from contracting to end of remediation?
Typically between 9 and 18 months total, with the major phases being:
- Design and permitting 2-3 months
- Drilling 1-3 months
- Construction 2-4 months
- Operations 3-12 months depending on scope
- Demobilization, site restoration, and reporting 2 months
Can you treat below the water table?
Yes. We do about half of our thermal work below the water table.
Where can I request a preliminary evaluation of my site?
Click here to request one.
What does a laboratory treatability test cost?
Between $15K and $50K - depending on number of samples and the complexity of testing.
What is the typical remediation efficiency?
The remediation efficiency varies depending on the contaminant/s of concern, starting concentrations, scope of the remediation and treatment temperature. Most TerraTherm projects have reached remediation efficiencies above 99%. MCL-levels have been reached at some sites.
What contaminants can be treated with the TerraTherm technologies?
All organic contaminants including chlorinated solvents, BTEX, mineral oils, creosote, coal tar, PCBs, dioxins, PAHs, pesticides and others. Some mixtures of contaminants may require a treatability study to determine exactly what treatment temperature is necessary to reach your remedial goals.
What soil types can be treated thermally?
All soil types can be remediated using one or a combination of TerraTherm's technologies. Specific soil parameters like porosity, water saturation, and organic content may determine what heating technology or combination of heating technologies may be required for the specific site.
Is it possible to do thermal remediation beneath a building?
Yes it is, and TerraTherm has done it several times. Prior to implementation, subsidence has to be considered. This issue is of special interest in high temperature applications in clay or peat, where partial/full drying of the soil during treatment occurs. At many sites, subsidence does not occur.
How do thermal conduction heating and electrical resistance heating compare from an energy and cost standpoint?
For treatment of CVOC sites, TCH and ERH require similar amounts of electric power per cubic yard (kWhr/cy), and both techniques are potentially subject to the same kinds of heat losses to the surroundings. Cost differences, if any, usually reflect the site scale and geometry. Installation of ERH electrodes requires drilling much larger diameter borings than installation of TCH casings, a cost difference that tends to be negated by somewhat wider spacing of ERH than TCH borings. TCH elements operate at temperatures above the soil target temperature, which generates a thermal gradient that helps drive heat transfer into the formation more quickly and uniformly; however, only a small fraction of the treatment zone is heated above the target temperature during TCH. In contrast to TCH, ERH is not generally applicable to treatment of SVOC sites.
Does TerraTherm have any international project experience?
Yes. TerraTherm has completed or is currently working on projects in South America (Brazil), Europe (Denmark, United Kingdom, the Netherlands, and Italy), Asia (Japan), and Australia. In some parts of the world TerraTherm has local sublicenses with companies such as Krüger A/S (Denamark, Sweden, Netherlands, Belgium, Norway, Finland, Poland, and Italy), and SheGoTec (Japan).