Risk assessments can be utilized to mitigate property contamination in lieu of physical remediation. They involve thoroughly evaluating property and contaminant characteristics and the respective pathways through which potential receptors may be exposed to contaminants. The evaluations can identify open exposure pathways which can frequently be mitigated through implementation of institutional and/or engineering controls, eliminating the necessity for costly remediation.
Remediation generally involves contaminant removal or the reduction in contaminant concentrations from environmental media at a Site. ESE may conduct feasibility assessments, bench tests, and pilot tests to determine the most beneficial technology and/or processes available to remediate site contaminants. Some remedial methods include excavation, land farming, in-situ chemical oxidation, bioremediation, and in-situ immobilization.
ESE is committed to recycling the land and revitalizing our cities and neighborhoods, making the unusable usable; Making Brownfields Green. We enable our clients to realize unconsidered financial opportunity in real estate associated with environmentally impaired properties. We will increase the value of your property and deliver new development options through environmental risk management and engineering.
Is an in situ remedial technology that reduces concentrations of volatile constituents in petroleum products that is absorbed to soils and dissolved in groundwater. This technology, which is also known as “in situ stripping” and “in situ volatilization,”, involves the injection of contaminant-free air in the subsurface saturated zone, enabling a phase transfer of hydrocarbons from a dissolved state to a vapor phase . The air is then vented through the unsaturated zone.
Bioremediation is the use of microbes to clean up contaminated soil and groundwater. Microbes are very small organisms, such as bacteria, that live naturally in the environment. Bioremediation stimulates the growth of certain microbes that use contaminants as a source of food and energy. Contaminants treated using bioremediation include oil and other petroleum products, solvents and pesticides.
Remedial Technology that reduces concentrations of volatile constituents in petroleum products absorbed to soils in the unsaturated (vadose) zone.
A bioremediation treatment process that is performed in the upper soil zone or in biotreatment cells. Contaminated soils, sediments, or sludges are incorporated into the soil surface and periodically turned over (tilled) to aerate the mixture.
A technique used to build reinforced concrete walls in areas of soft earth close to open water or with a high ground water table. This technique is typically used to build diaphragm (water-blocking) walls surrounding tunnels and open cuts, and to lay foundations.
The physical removal of light non-aqueous phase liquids from soil and groundwater.
The physical removal of dense non-aqueous phase liquids from soil and groundwater.
Engineered Cap Design & Construction
A man made synthetic or earthen cover put in place over a contaminated area to prevent further exposure to the environment and sensitive receptors within that environment. Most landfills are covered with engineered caps.
In Situ Chemical Oxidation
Using groundwater remediation to reduce the concentrators of targeted environmental contaminants to acceptable levels. In-Situ chemical oxidation is accomplished by injecting or otherwise introducing strong chemical oxidizers directly into the contaminated medium (soil or groundwater) to destroy chemical contaminants in place. It can be used to remediate a variety of organic compounds, including some that are resistant to natural degradation.
Ex-Situ Chemical Oxidation
The process of mixing an oxidizing compound with contaminated groundwater in a vessel. The oxidizing compound can be a solution or a gas. The oxidizing agents most commonly used for the chemical treatment of organic contaminants are ozone, hydrogen peroxide, hypochlorites, chlorine, and chlorine dioxide. The treatment chemicals typically mineralize most organic compounds to carbon dioxide, water and salts. The main advantage of ex-situ chemical oxidation as opposed to in situ chemical oxidation is that it allows sufficient time for oxidation to occur in a controlled environment.
Monitored Natural Attenuation
A technique used to monitor or test the progress of natural attenuation processes that can degrade contaminants in soil and groundwater.
A structure including perforated conduits in gravel to expedite transfer of water to or from a soil aquifer.
Zone or reactive material that extends below the water table to intercept and treat contaminated groundwater. EPA researchers investigate the geochemical, hydrogeological, and microbiological factors that govern the performance and functioning of PRBs. Understanding these factors is necessary in order to predict the longevity of PRB systems, conduct economic analysis, and optimize this groundwater cleanup technology for a wide variety of hazardous compounds.
For soil remediation where contamination is removed from soil by carrying it through a medium such as air or steam. The extracted soil vapors are separated into liquids and vapors, and each stream is treated as necessary. SVE is suitable for removing a variety of contaminants that have a high vapor pressure or a low boiling point compared to water, such as chlorinated solvents.
Response Action Plans
A written plan that is usually submitted to a regulatory agency which outlines the scope of work proposed for the removal or mitigation of contaminants in the environment.
PST Corrective Action
|•||Design of replacement system. If the removed system is to be replaced, it is more important that the design of the replacement system include provisions to prevent the reoccurrence of such contamination.|
|•||Site Assessment. The site must be reviewed to determine the extent of the contamination. It is critical that this assessment be conducted properly since the amount of additional cleanup and potential for litigation is highly dependent on this review.|
|•||Emplacement of drilled wells to assess potential contamination. Depending on several factors, the site may have to be examined using drilled water wells. The depth, number and location are dependent on the site.|
|•||Disposal of contaminated waste. Removal of waste from the site, both from the removal of existing systems and from site assessment, must be disposed of an environmentally safe manner.|
|•||Sample Analysis. Samples taken at the site must be analyzed for contamination. The results of such analysis form the basis for determining what must be done to clean up the site.|
|•||Develop corrective action proposals. Once the site has been determined to be contaminated, the next step involves developing a method for cleaning up the site, which may involve removal of contaminated material through more sophisticated methods.|
|•||Site Cleanup. The final step in resoling a LPST site is implementation of the corrective action proposals which should result in return of the site to its uncontaminated state and closure of the state’s listing of the property as an environmentally contaminated site.|