During his career, Darrell has performed as a lead technical manager for more than $3 billion worth of projects, including those for the U.S. Environmental Protection Agency, the U.S. Department of Energy, the U.S. Department of Defense, and private industry clients. His experience spans the project life cycle, from project planning, conceptual design, and cost estimating to detailed design, field inspection, and construction quality assurance and compliance monitoring. For the past decade, he has concentrated his practice on the remediation of contaminated sediments.
As a consultant, Darrell played a lead role in the design and management of some of the largest, most complex sediment remediation projects completed in the United States and overseas during the past two decades. This includes his role as the design manager for the BHP Billiton Hunter River Sediment Remediation Project in Newcastle, Australia, one of the largest sediment remediation projects in the world. Applying his problem-solving skills and knowledge of mechanical and hydraulic dredging technology, he has supported remediation of more than 2 million cubic yards of contaminated sediment during his career, with many of his projects earning national and international awards for innovation.
Prior to specializing in sediment remediation, Darrell provided a diverse range of civil, environmental, mining, and water resources consulting services in his private practice. His civil design experience includes site design of commercial and industrial facilities and the design of water and waste water treatment plants for municipal and industrial clients. He also has designed storage and disposal facilities for solid, hazardous, and mixed radioactive wastes; conducted remedial investigations and feasibility studies; and developed remedial action plans for numerous hazardous waste sites.
In support of mining clients, Darrell has designed the layout of surface coal mines, prepared environmental impact assessments, negotiated environmental permits, conducted geotechnical investigations, and designed treatment solutions for acid mine drainage. He also has performed surface water, groundwater, and sedimentology modeling for numerous Appalachian mine sites in an area stretching from southern Tennessee to West Virginia.