Stell reviews and implements remedial actions under CERCLA Records of Decision and RCRA Decision Documents that ensure remedies and corrective measures are protective of human health and environment, value engineered, and optimized for efficiency in compliance with regulatory requirements. Site cleanups are designed to effectively reduce pace-to-closure and associated lifecycle costs. Fate and transport modeling confirms the efficacy of remedial actions and time to closure. Analytical data from monitoring are compiled, managed, and validated for analysis and geographic information system visualization. These activities support negotiations for accelerated property transfer, site closure, and corrective action completion.

Because an exit strategy is the ultimate objective for each site or facility, it is developed under and defined by the governing regulations. A regulatory specialist is integrated into the project team at initiation and remains committed until closeout. This ensures that the exit strategy remains valid and that positive relationships with regulators are maintained. With this focus, we can support your organization in meeting regulatory requirements while rehabilitating contaminated sites and rebuilding the value of your property.

Successful Projects:

Former Arkansas General Industries (AGI) Site, Bald Knob, AR – Environmental Protection Agency (EPA)

The former AGI site is the site of contamination resulting from electric motor manufacturing.  The EPA requested a bioremediation project to address trichloroethene (TCE) contamination. Stell managed a pilot study to verify the effectiveness of bioremediation through the injection of a TCE degradation-enhancing substrate. We assisted the EPA and State of Arkansas in identifying and determining the lateral extent of the TCE plume and designed the pilot study based on the plume delineation results. Our engineers worked closely with the Arkansas Department of Environmental Quality (ADEQ) to acquire a Class V injection wells permit under the ADEQ Underground Injection Control Program Inventory.  We designed the layout and locations of the injection wells to address TCE-contaminated groundwater within the target treatment zone. We oversaw well installation and conducted baseline groundwater sampling. We determined the appropriate electron donor materials, injection rates, and injection quantity and proposed the use of Regenesis 3-D MicroemulsionTM (3DMe). Stell worked with the EPA to redesign the well injection field associated with reduced funding without a delay in the project schedule or compromise of the project objectives.

Our clients for this project include the U.S. Army Corps of Engineers as the contracting agency, the EPA as the funding agency, and the ADEQ as the regulatory agency. We effectively communicated and coordinated with all three agencies and streamlined communications processes by proactively identifying issues and recommending a path forward that met all technical, budget, and schedule requirements.

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Remedial Design, Former Nike Battery, Waldorf, MD (U.S. Army Corps of Engineers)

Stell is prepared a remediation work plan and design for groundwater impacted by chlorinated solvent volatile organic compounds (VOCs). The contaminant plume extends off site into residential use area and threatens surface water in stream. Our engineers developed a preliminary conceptual site model, scoped and prepared remedial investigation data gap investigation work plan, and completed a Quality Assurance Project Plan to complete plume characterization. We are designing pilot tests for injection of emulsified zero-valent iron amendment to destroy chlorinated VOCs through combination of short term direct dechlorinization and long-term augment bioremediation. We are identifying easements, permits, and approvals that will be required to implement the remedy.  We are creating a Site Monitoring and Performance Evaluation Plan to evaluate the effectiveness of the implemented remedy in attaining the remedial action objectives, performance objectives and specified cleanup levels for all exposure pathways of concern.

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