Soil, soil gas, and groundwater remediation is the process of cleaning up environmental contamination in these resources by removing pollutants, reducing their concentration to acceptable levels, or immobilizing them to prevent harm to human health and ecosystems.
This involves initial assessment and investigation, selection of appropriate technologies like excavation, bioremediation, or vapor extraction, implementation of the chosen methods, and ongoing monitoring to ensure effectiveness.
Reliable and Proven Methods
GRI offers portable high vacuum Soil Vapor Extraction (SVE) and Dual-Phase Extraction (DPE) systems. SVE and DPE are proven methods for treating chlorinated solvents (from sources like dry cleaners and metal plating facilities) and hydrocarbons (such as gasoline, diesel, and related fuels), and remain one of the most trusted methods for remediating these contaminants from soil, soil gas, and groundwater.
At many fuel-contaminated sites, cleanup can be completed in less than 12 months. Chlorinated solvent sites are more challenging, and may ultimately require vapor intrusion mitigation systems (VIMS) under new construction; however, regulatory agencies often want as much contaminant mass removed as feasible prior to accepting VIMS, and SVE/DPE are among the most effective methods to remove contaminant mass.
How SVE and DPE Work
SVE remediates soil and soil gas simultaneously, and DPE additionally remediates groundwater simultaneously. SVE and DPE can influence larger areas than injection methods. Sparging or injection can also be combined with SVE or DPE to further speed up remediation efforts.
Where feasible, soil excavation is recommended prior to SVE, DPE, or other remediation methods.
Cost Efficiency
The cost to remediate small to medium sites using GRI portable SVE/DPE systems can potentially be less than the cost to design, permit, and install a permanent system alone, before any operations costs are considered. GRI rates are based on run time only, so you only pay when operating, and only operate when it is productive. This is ideal for pilot tests, pulsed remediation, sites too large for one fixed system, and combining technologies.
Sometimes, pulsed remediation is most efficient, such as operating only during the dry season, and GRI systems make that feasible. You do not pay rental or installation costs for a system that does not work, is not productive, or when you need to stop for sampling. It is our incentive to ensure our equipment is working properly.
Rapid Deployment
Operations with GRI portable systems can begin with as little as 3-days’ notice within the jurisdictions of the Bay Area Air Quality Management District (BAAQMD) and Monterey Bay Air Resources District (MBARD).
Permitting a new system can take up to 12 months with the BAAQMD, but GRI systems have active permits for various sites with BAAQMD and MBARD, a major time advantage. We can also operate within some parts of the Yolo-Solano Air Quality Management District and San Joaquin Valley Air Pollution Control District.
If groundwater treatment is necessary, GRI can obtain permits with local water treatment facilities for disposing of treated groundwater.
Robust Performance
GRI systems are capable of extracting up to 350 cubic feet per minute of soil vapor, treating up to 20 gallons per minute of water, applying a vacuum up to 15 inches of mercury, and extracting from up to eight wells simultaneously.
If additional capacity is needed or for larger sites, multiple systems can be operated simultaneously to speed up remediation efforts. Our systems also meet residential noise ordinance limits.