IMPOUNDMENT CLOSURE USING DISCRETE IN-SITU SOLIDIFICATION SITE UPDATE

Tim Silar, Silar Services
John Magee, Silar Services

Description

Impoundment Closure Using Discrete In-situ Solidification – Site Update Authors Mr. Tim Silar - United States - Silar Services Mr. John Magee - United States - Silar Services Abstract In accordance with USEPA guidance, the protection of groundwater and/or surface water is driving CCP impoundment closures. This presentation will describe an impoundment closure where discrete in-situ solidification is being implemented to achieve USEPA’s requirement of controlling the vertical and horizontal movement of groundwater. The technology, which has gained regulatory approval, will hydraulically isolate the ash from the groundwater by constructing a hydraulic barrier at the bottom of the impoundment using engineered ISS applications on the ash and/or underlying natural material. Advantages of this closure/remediation strategy include: • Combined closure and corrective action method; • Meets both horizontal and vertical groundwater control requirements by containing the ash; • Eliminates the need to remove ash from the impoundment; and, • Significantly reduces cost to close/remediate the impoundment compared to excavation. This presentation will describe the case study where the remedial technology is being implemented and provide an update on the progress. Elements of the presentation will include: • Regulatory framework; • Conceptual site model; • Pilot scale study design, implementation, and results; and • Full-scale remedial design, procurement, and implementation.

 
May 14th, 1:00 PM May 14th, 1:30 PM

IMPOUNDMENT CLOSURE USING DISCRETE IN-SITU SOLIDIFICATION SITE UPDATE

Grand Rapids, Michigan

Impoundment Closure Using Discrete In-situ Solidification – Site Update Authors Mr. Tim Silar - United States - Silar Services Mr. John Magee - United States - Silar Services Abstract In accordance with USEPA guidance, the protection of groundwater and/or surface water is driving CCP impoundment closures. This presentation will describe an impoundment closure where discrete in-situ solidification is being implemented to achieve USEPA’s requirement of controlling the vertical and horizontal movement of groundwater. The technology, which has gained regulatory approval, will hydraulically isolate the ash from the groundwater by constructing a hydraulic barrier at the bottom of the impoundment using engineered ISS applications on the ash and/or underlying natural material. Advantages of this closure/remediation strategy include: • Combined closure and corrective action method; • Meets both horizontal and vertical groundwater control requirements by containing the ash; • Eliminates the need to remove ash from the impoundment; and, • Significantly reduces cost to close/remediate the impoundment compared to excavation. This presentation will describe the case study where the remedial technology is being implemented and provide an update on the progress. Elements of the presentation will include: • Regulatory framework; • Conceptual site model; • Pilot scale study design, implementation, and results; and • Full-scale remedial design, procurement, and implementation.