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GSI staff are leaders in hydrogeologic assessment, geochemical characterization, groundwater modeling, corrective action and closure design, and regulatory compliance for our electric power utility clients. Our clients rely on our ability to navigate complex technical and regulatory issues while identifying and addressing environmental concerns related to management of CCR and their potential impacts to soil and groundwater. Through a multidisciplinary approach, we assist clients in developing effective strategies for monitoring, assessment of corrective measures, corrective action implementation, unit closure design, and the long-term management of CCR-impacted groundwater.
GSI engineers and scientists have evaluated, designed, and implemented groundwater corrective actions and unit closures at CCR sites based on a strong understanding of site conditions, including the nature and extent of impacts along with local geology and hydrogeology. Our groundwater modeling specialists develop site-specific groundwater flow and geochemical transport models to support remedy evaluation and remedial design while ensuring compliance with federal and state CCR regulations.
GSI is actively conducting semiannual groundwater detection and corrective action monitoring, as well as implementing groundwater remedies, at a Texas CCR site. This work also includes compliance reviews to ensure that Federal and new State of Texas requirements are met.
GSI provided regulatory and technical review of a groundwater monitoring network developed for a CCR landfill at a different site in Texas. The review included statistical evaluations and recommendations for alternate sampling approaches to improve data quality and reliability, and to reduce false exceedances of regulatory threshold criteria.
GSI conducted sampling and bench-scale studies to evaluate closure options for three CCR settlement ponds. The closure was completed by solidifying CCR sediment in-place and installing an engineered cover to prevent exposure to the CCR sediment and affected soils.
Related practice areas include: