Soil Remediation Technologies

Most regulatory agencies have strict clean-up levels that require remediation or removal of contaminated soils. Contamination may be as simple as petroleum hydrocarbons or as complex as volatile organics and heavy metals. Enviroserv offers several solutions as outlined below:

Bio-Remediation
This technology is typically applied for low level petroleum hydrocarbon contamination. The soil is excavated and a biological agent is added and mixed with the contaminated soil. This alone can dramatically lower the levels of hydrocarbons present, often to below clean-up standards. Bio-Remediation technology can also be utilized for onsite treatment.

Thermal Desorption
Soil is heated on a rotary kiln to approximately 1,500 degrees. The hydrocarbons are flashed off rendering the soil clean. Soil that has been thermally treated is typically reused as fill or base for other construction projects. Thermal desorption technology is feasible for onsite treatment on larger applications.

Incineration
Waste that is contaminated with RCRA levels of certain contaminants may not be applicable for treatment and/or landfill. This would of course include land-banned (LDR) contaminants. The contaminated wastes are incinerated to complete destruction. Although the remaining ash is still considered hazardous that must be stabilized and landfilled.

Land Disposal
Landfill is the most frequently utilized method of disposal. There are three classes of landfills. Each landfill has varying restrictions on the type of waste and acceptable levels of contamination they can receive.  Non-Hazardous, Non-RCRA (California regulated) and RCRA (Federally regulated) wastes can be land filled when allowed by the Environmental Protection Agency (EPA) universal treatment standards.

Onsite Treatment Options
Depending on the contaminants in the soil, Onsite Treatment may be an option. Onsite treatment requires extensive analytical and research. Treatment options include but are not limited to the following methods:


Fixation/Stabilization In-Situ Treatment

RCRA and Non-RCRA soils contaminated with heavy metals can be stabilized on site. Ionic and covalent bonding is used to bind metals in a silicate or similar sequestering matrix and limit the leaching characteristics of metals to below applicable state and federal threshold limits. Successfully processed soil can be transported offsite as “Non-Hazardous”.