Remediation Services

Soil and Groundwater Remediation- Corrective Action

CRG Texas Environmental Services, Inc. (CRG Texas) has extensive experience in soil and groundwater remediation. The company maintains a group of environmental professionals, technologists, and equipment operators with specific knowledge and expertise in site remediation, and managing oil and gas exploration and production facilities, retail marketing facilities, fleet fuel transportation facilities, and refineries.

CRG Texas provides the materials, equipment, and manpower you need to complete your environmental project efficiently and effectively while delivering high quality results. We have closed many cases under the Texas Commission on Environmental Quality (TCEQ) and Railroad Commission of Texas (RRCTX) Voluntary Cleanup Program (VCP) and Enforcement/Operator Cleanup Programs (OCP). Contact us today for a free quote or to request a site visit and detailed cost estimate .

Soil and Groundwater Remediation Types

Excavation and Disposal
In-situ Chemical Oxidant or Microbial Treatment and Soil Mixing (treatment in place)
Soil Vapor Extraction (SVE) or Product Recovery (single phase vapor or liquid)
Mobile Dual Phase Extraction (MDPE- simultaneous vapor and liquid phases)

Excavation and Disposal Services

Excavation and disposal, colloquially known as “dig and haul,” removes contaminated wastes from its current location and transports it to a permitted off-site treatment and/or disposal facility. Soil and sediment type wastes are normally classified as Class 1 and Class 2 non-hazardous waste, or as hazardous waste based on laboratory chemical analysis of representative waste stream samples. Once the samples are analyzed, then the waste is profiled, and then the waste is transported for disposal under waste manifests for each load. Sediment and wet soil wastes are sometimes required to be solidified to meet the disposal facility requirements according to a “paint filter test”.

CRG Texas Environmental Remediation Services provides the necessary experience and equipment to remove impacted surface and subsurface soils and sediments. Processes can be as simple as excavation, stockpiling, analytical testing, and contaminated soil hauling to a regulated landfill. Or, the solution may be as detailed as using drilled caissons, coffer dams, and settlement basins to solidify, treat, and stabilize contaminated waste. If the contamination affects lake sediment, riverbed, or bay bottom, dredging may also be conducted. In any case, soil or sediment removed would be sampled, profiled, loaded, and transported for disposal at a licensed waste disposal facility according to waste classification.

In-Situ Chemical Oxidant Remediation

In-situ Chemical Oxidant (chem-ox) or Microbial Treatment (enzymes and micro-organisms) and Soil Mixing (treatment in place)
Chemical Oxidation is an in situ remediation technology that can be applied to soil, groundwater, or pit waste and can consist of many different contaminants. Chem-ox treatment is a process where strong oxidants are injected or mechanically mixed into the treatment zone to promote destructive aerobic degradation reactions or where oxygen release compounds (ORC) are introduced to enhance bio-remediation through in-situ oxidation. Microbial treatment is also commonly used, and is applicable to many hydrogeologic settings, and relies on well-known technologies such as injection and mixing in place contaminated soil or sediment with micro-organisms and enzymes. Because of stoichiometry and mass balance limitations, it may be inefficient when applied to treat single-phase and dual phase separated hydrocarbons (i.e., light or dense non-aqueous phase liquid (LNAPL or DNAPL)) zones.

CRG Texas' experienced team of professional and technical staff uses the latest technology and equipment to deliver in-situ chemical oxidants to the impacted soil and groundwater zones for fast and cost-effective remediation. This process involves excavating the contaminated area into large bermed areas where they are treated using chemical oxidation methods.

Soil- Vapor Extraction

Soil vapor extraction (SVE) is a physical treatment process for in situ remediation of volatile contaminants in capillary fringe or smear zone (unsaturated) soils caused by fluctuations in groundwater elevations across a contaminated site. SVE (also referred to as in situ soil vapor extraction or vacuum extraction) is based on mass transfer and removal of contaminants from the solid and liquid phases into the gas phase, with subsequent collection of the gas phase contamination at extraction wells, recovery trenches, or treatment vessels. Extracted contaminants in the gas phase (and any condensed liquid phase) is treated in aboveground systems that may consist of granular activated carbon, air strippers, and thermal desorbers. SVE is the capillary fringe zone equivalent of the pump-and-treat technology for groundwater remediation. SVE is particularly amenable to contaminants with higher volatility, including various chlorinated solvents and hydrocarbons.

CRG Texas provides soil vapor sampling and analysis services to identify the nature and extent of soil vapor encroachment in proximity to structures and sensitive receptors. Once the extent of soil vapor impacts are determined, then remedial technology screening and pilot testing of soil vapor extraction equipment and off-gas controls and treatment is conducted under Permit by Rule (PBR) to determine full scale remediation technologies according to site conditions, budget, and schedule.

Dual Phase Extraction

(DPE- simultaneous vapor and liquid phase extraction) is where one or more pumps are used to remove contaminants from the groundwater or to the soil. Mobile and stationary dual phase extraction systems usually consist of more than one pump to lower groundwater elevations while exposing contaminated soil columns in extraction wells while one pump is used to extract contaminated groundwater while the other pump is used to remove vapors out of the affected soil and groundwater. The extracted contaminants are pumped through separate treatment systems to reduce concentrations in vapor and liquid phases. Vapor phase treatment is permitted, and liquid phase waste is contained, characterized, and disposed or discharged under permit through State and local government regulatory agencies.

CRG Texas provides mobile dual phase extraction units for short term remediation and stationary dual phase extraction systems for long term remediation projects.