TRS Group, Inc. is the world’s most experienced provider of Electrical Resistance Heating (ERH) for in situ soil and groundwater remediation. TRS has applied ERH on over 130 projects. TRS consistently meets and surpasses our client’s objectives, providing rapid closure to sites that have often attempted other remediation technologies without success. With offices throughout the U.S., Brazil, and the E.U., the world’s largest and highest-quality fleet of ERH specialty equipment, and an outstanding safety record, TRS has become the leader in subsurface heating. No other remediation technology can provide treatment certainty for varying lithologies and contaminates; as rapidly; and with no rebound…guaranteed.

Company details

1338 Commerce Ave. #304 , Longview , WA 98632 USA

Locations Served

Business Type:
Industry Type:
Soil and Groundwater - Site Remediation
Market Focus:
Globally (various continents)
Year Founded:
$10,000,000 US - $100,000,000 US

TRS ERH: Proven In Situ Technology

TRS brings the experience and knowledge gained from performing Electrical Resistance Heating (ERH) on over 130 projects to each new remediation site. Since the launch of the technology in the remediation industry in 1997, we have perfected our unique methodology for in situ ERH and conductive remediation. The TRS ERH process stems from the U.S. Department of Energy (DOE) and Battelle Pacific Northwest Laboratories. TRS is licensed by Battelle to apply all of the ERH and Six-Phase Heating patents that Battelle developed on behalf of the U.S. DOE.

TRS remediation solutions prove effective for even the most complex and difficult NAPL remediations. We have successfully resolved a variety of unique site conditions encountered at public, retail, military, and industrial sites across the broadest range of subsurface conditions and logistical challenges. We pride ourselves as much in our outstanding safety record as we do our industry reputation for innovative designs to tackle new and emerging contaminants and site conditions. Looking ahead, we will continue to expand our service areas around the globe and will be introducing additional innovative thermal options and combined remedy applications.

TRS Group, Inc. Offers:

  • Competitive Pricing - Lowest lifecycle cost compared to other technologies
  • Proven Design - Hydraulic & vapor controls eliminate vapor intrusion
  • Flexible Solutions - Various electrode designs for all soil matrices including bedrock
  • Regulatory Acceptance - EPA approval in all regions and states where it has been applied
  • Sustainability - Lowest carbon footprint compared to other technologies
  • Combination with other Technologies - Heat-enhanced, bioremediation, chemical oxidation and additional options
  • Site Closures - No rebound after project completion
  • Guarantee - Contracting options to guarantee remediation success

TRS is committed to holding the industry leadership position in ERH and conductive in situ remediation. We excel at the quick cleaning of contaminated sites to put them back into productive public and private use. As the most experienced industry leader in the application of Electrical Resistance Heating (ERH), we strive to serve as the most trusted heat-enhanced remediation authority for the collective benefit of our clients, employees, shareholders, and the general public. In TRS, you will find customer-focused people passionate about our work.

Forming Strategic Partnerships to Deliver ERH Solutions Around the Globe.

TRS Doxor, South America

TRSDOXOR, based in Sao Paulo, has been providing ERH services to the Brazilian marketplace since 2009. TRSDoxor is the only thermal provider to complete three successful projects in Brazil and continues to grow with additional project contracts.


  • Electrical Engineer on staff (Brazil law)
  • Locally manufactured equipment fleet
  • Import/export services (RADAR registration)

TRS Europe.

TRS-Europe is a group of elite service providers throughout Europe providing ERH services to the European marketplace.


  • Highest capacity & quality
  • Guaranteed results
  • Local network & footprint throughout Europe

Under the TRS Europe umbrella is TRM Ltd, based in Derbyshire with a regional office in Bristol, working to provide TRS ERH throughout the United Kingdom and Ireland.

Three Options for Working with TRS Group, Inc.

TRS offers the following three broad categories of contracting options for Electrical Resistance Heating (ERH) remediation:

  1. Standard Fixed Price Remediation (SFPR)
  2. Guaranteed Fixed Price Remediation (GFPR)
  3. 100% Money-Back Guaranteed Remediation (MBGR)

Standard Fixed Price Remediation (SFPR) provides the lowest cost option. Guaranteed Fixed Price Remediation (GFPR) or Money-Back Guaranteed Remediation (MBGR) are usually applied after a firm clean-up goal has been negotiated with regulators. Regardless of which method of contracting is used, TRS highly recommends checking references from previous projects. Details of each contracting option are provided below.

1. Standard Fixed Price Remediation

Using Standard Fixed Price Remediation contracting, TRS bills a fixed price for the completion of a set series of project tasks. Typically, these tasks are design, electrode materials mobilization, system installation and start-up, system operation, and demobilization and final reporting. SFPR is also the price basis for most of our preliminary budget estimates. For each remediation, TRS develops an estimate of the amount of electrical energy, in kilowatt-hours, that will be required to reach the remedial goal. This estimate is referred to as the 'Design Remediation Energy.'

The Design Remediation Energy is most strongly influenced by:

  • The remediation volume (usually measured in cubic yards)
  • The target VOC (boiling temperature and water solubility)
  • The percentage VOC reduction desired (whether measured using soil samples or groundwater samples or both)
  • The soil total organic carbon content (TOC)
  • The presence of low volatility hydrocarbons such as oil or grease

Perhaps surprisingly, the Design Remediation Energy is relatively unaffected by the type of soil (gravel, clay or bedrock), the state of water saturation, the soil electrical conductivity, or the presence of DNAPL.

Under an SFPR contract, TRS will continue operation until the remedial goal is reached or until TRS has input the Design Remediation Energy, whichever occurs first. Based on previous experience, TRS estimates that about 80% of remediation projects reach the remedial goal prior to inputting the Design Remediation Energy. Under an SFPR contract, TRS is highly motivated to try to finish the remediation early. The client also wins because less electricity is used and fewer ancillary costs such as project management, sampling, and reporting costs accrue. SFPR contracting protects the client from cost over-runs and change orders unless the original scope of work is increased. TRS charges no additional cost in the event its equipment malfunctions or if TRS is otherwise slow to complete its work due to factors within its control. For these reasons, change orders are very rare for TRS projects.

2. Guaranteed Fixed Price Remediation

GFPR contracting is usually most applicable when a specific numerical clean-up goal has been negotiated with regulators. This goal is normally site-specific and has a risk-based component stipulating that no further remediation will be required upon achieving the goal for the site. Because GFPR transfers risk from the property owner to TRS, these contracts result in higher project pricing. The exact amount of price increase over an SFPR contract depends on a myriad of site-specific details. However, the average increase is about 15-20% of the TRS price. The guarantee is usually enforced by a large retainage (20-30%), which is payable only when the contracted clean-up goal is achieved.

In order to provide a GFPR, the parameters that impact the TRS Design Remediation Energy (bulleted items above) must be well-documented. Also, the performance measurement methods, the locations and the number of samples must be determined in advance. Either soil or groundwater samples can be used to measure guaranteed performance.

Regardless of how thorough the site assessment, there is always a possibility of undetected contamination just outside the treatment region along one of the remediation boundaries. To guard against possible flux of contamination into the treated region, TRS prefers that confirmatory soil samples be collected from locations that are at least 5 feet from a remedial boundary. Similarly, confirmatory groundwater samples should be collected from locations at least 15 feet from a remedial boundary.

The price increase to provide a GFPR also depends on whether a statistical analysis is applied to data interpretation, especially if soil sampling is used to determine remediation success. The three principal data interpretation possibilities are:

  • Sample average must be below the remedial goal - least difficult to achieve
  • Sample upper confidence limit (UCL, e.g. 90% UCL) must be below the remedial goal - moderate difficulty
  • All samples must be below the remedial goal - most difficult to achieve
    • For example, the following scenarios have similar difficulty:
    • The average TCE concentration in soil must be less than 1 mg/kg
    • The 90% UCL TCE concentration in soil must be less than 2 mg/kg
    • All soil samples must have less than 20 mg/kg TCE

TRS will usually recommend several rounds of sampling. For example, the first round of sampling might indicate that 80% of the sample locations have VOC concentrations low enough to meet the remedial goal. TRS would then shut off 80% of the ERH system and concentrate efforts on the region that still requires remediation. The second round of soil sampling would include the 20% of locations that did not meet the goal in the first round and it is likely that all but one or two locations would pass in the second round. The third round of soil sampling might include just a boring or two. Groundwater sampling is easier than soil sampling and therefore all monitoring wells are usually sampled in each event.

3. 100% Money-Back Guaranteed Remediation

MBGR contracting is applicable when specific numerical clean-up goals have been negotiated with regulators. Goals can be based on soil concentrations, groundwater concentrations, or both. MBGR contracting is available for most sites that are contaminated with VOCs and that consist of natural soil and rock - not debris.

Because MBGR transfers all risk from the property owner to TRS, these contracts result in higher project pricing. The exact amount of price increase over a SFPR contract depends on site-specific details. However, the average increase is about 30-35% of the TRS price. The guarantee is usually enforced by a large retainage (40%), which is payable only when the contracted clean-up goal is achieved.

The MBGR includes a repayment phase if the goals are not met. A predicted operating time is defined in the TRS proposal. Repayment begins if your goals have not been met before the end of the third month after the operating time has been consumed. Repayment is made at a rate of 5% of the contract amount per month until TRS meets your goals or until all money has been refunded. Repayment is made from the escrow account until that account is exhausted, and then TRS issues a check each month.

Safe, Effective, and Proven Technology in all Lithologies

Electrical resistance heating is an in situ, thermal technology that uses commonly available electricity and applies it into the ground through electrodes. These electrodes can be installed either vertically to any depth or horizontally underneath buildings, operating facilities, and in the presence of buried utilities. The technology is equally effective in soil and groundwater.

The technology was first commercially deployed in 1997 by many of the current TRS employees and can be deployed in a variety of applications. These include: underneath buildings, in active facilities and with public access, for chlorinated volatile organic compounds at concentrations indicative of DNAPLs and fuel hydrocarbons as LNAPL, in most types of lithologies (including bedrock), and varying contamination depths (now up to 135-ft bgs). TRS has 100% client satisfaction on all projects and a dozen of the commercial sites have received closure.

A Perfect Record of Successful Performance with ERH

TRS staff has performed over 75% of the ERH remediation projects in the world. The ERH technology has been successfully and cost effectively implemented on both small and large sites, varying site lithologies (including bedrock applications), and deepest applications.

TRS has unmatched experience using ERH for the remediation of soil and groundwater impacted by chlorinated volatile organic compounds (CVOCs) and petroleum hydrocarbons. We have successfully cleaned DNAPL and LNAPL sites and have treated compounds in the boiling range of methylene chloride to solid grease. The more sites you clean, the more contaminant types and remediation challenges you experience.

No company has heated under more occupied or vacant buildings than TRS. We have performed ERH cleanups that required heating beneath, or immediately adjacent to, a building or an area open to direct public access. We have cleaned under commercial properties, retail shopping centers, industrial manufacturing facilities, empty warehouses, active fire lanes, railway maintenance yards, and adjacent to residential properties across the country. On most of these projects we installed our ERH systems below grade to allow workers, pedestrians and vehicles safe and unimpeded access over the electrode fields.

TRS has performed ERH projects under the supervision of some of the environmental remediation industry’s most demanding clients, including the DOD, DOE, USACE, and EPA. We have created and implemented programs for source area delineation, sample collection and analyses, air monitoring, health & safety, and QA/QC that meet the standards of each of these groups.

TRS has built solid business relationships based on superior engineering and customer service and have many repeat clients. We promise our customers certainty that their projects will be completed to the performance and budgetary assurances presented in our proposals and often with contract guarantees.

Innovations in Remediation

TRS is a recognized leader in the in situ thermal remediation industry and we continue to lead the marketplace by integrating our sales, engineering, construction, and operations teams into project designs with our clients resulting in superior project execution. TRS is also leading the industry with new electrode designs, effective approaches for remediation of emerging contaminants, and combining remediation technologies. This includes low temperature ERH for enhanced bioremediation, multi-phase extraction, and chemical oxidation for safer and more efficient and greater contaminant reductions over time.

Recent Advances in TRS Technology Include:

Electrodes: TRS has designed, installed, and operated ERH systems using a variety of our patented electrode designs including bored electrodes, angled electrodes, sheet and round pile electrodes, and horizontal electrodes.

Bedrock Remediation: TRS has unmatched experience using ERH for the remediation of soil, bedrock, and groundwater impacted by chlorinated volatile organic compounds (CVOCs).

Heat-Enhanced Processes: TRS combines remediation technologies using low temperature ERH for enhanced bioremediation, multi-phase extraction, and chemical oxidation. This includes sites with DNAPL and LNAPL and treatment of compounds in the boiling range of methylene chloride to solid grease including coal tar.

Emerging Contaminants: TRS project and laboratory data is supporting remediation of 1,4-dioxane using ERH.