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Investigation and Remediation
Cody Ehlers Group has performed investigation/remediation projects throughout the continental United States, Puerto Rico and Canada. We have used expert risk assessment, state-of-the-art remediation technology expertise and strong regulatory negotiating skills to achieve beneficial closures and protect our clients' interests.
Our approach follows the same general formula for each remediation project:
- Clearly define project objectives that make sense within the site-specific context of the project (geologic conditions, receptors, risk, regulatory framework and client goals with respect to cost, timing and long-term liability, etc.). Project objectives must be technically practicable and must provide real environmental benefit and risk reduction that justifies the resources to be expended. In some cases, that may translate into reduction of contaminants to drinking water standards. In others, where no receptors are threatened, source control and monitored natural attenuation may make the most sense. In still others, eliminating receptors by connecting groundwater users to a municipal water supply may be the right choice.
- Develop a plan to most efficiently and cost-effectively achieve the project objectives. Project team includes CEG staff and client personnel and vendors, as needed.
- Apply industry-leading technical expertise and regulatory negotiating skill, along with focused, energetic effort to achieve project objectives.
Where active remediation is determined to make sense, Cody Ehlers Group has successfully employed a wide variety of technologies to expeditiously move projects toward the correct conclusion. All technologies have strengths and weaknesses and need to be selected based on the particular conditions at a site. Remediation technologies provide options to remove vapor phase contaminants (SVE), to remove contaminated water (pump and treat), to strip volatiles from water and add oxygen to water (air sparging), to promote biological action in groundwater by addition of oxygen and nutrients (enhanced bio), to help remove chemicals locked up in soils (surfactants), to chemically breakdown organics (peroxide injection), as well as many other physical and chemical processes to help remove contaminants. Technologies may be combined in particular situations. The key decision is to select the correct technology(s) for a particular site.
Remediation technologies often fail because the physical or chemical process that is being introduced to remove or break down contamination is unable to contact a sufficient mass of the contaminant to have the desired effect. The natural system is, in fact, a complex heterogeneous subsurface with varying properties (grain size, porosity, carbon content, hydraulic conductivity etc.). Preferred pathways of flow are the norm. Technologies are often well suited to homogeneous conditions, but can only get a fraction of contamination under natural heterogeneous conditions. Recognition of this limitation is paramount. Technologies should only be realistically applied.
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Cody Ehlers Group
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