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Groundwater quality changes after closure in place

25 years of observations

Stu Cravens

OBG’s Stuart (Stu) Cravens, a thought leader in hydrogeology, recently joined Bruce Hensel of Electric Power Research Institute to talk about groundwater quality changes when a pond is closed in place.

Groundwater quality changes can be expected when a pond is closed in place. The type and degree of changes depend on factors like the type of cap, hydrogeology, and whether groundwater is intersecting. With extensive experience in the field, Stu and Bruce have worked on many projects—going back 25 years to today—that offer examples of various ponds, which have undergone in-place closure in varied hydrogeologic environments with a range of water quality characteristics. Drivers for observed change, or lack of change, are presented at each facility, as well as examples of groundwater model prediction results for recent closure plans of impoundments using modeled caps.

Learn more in the presentation Stu and Bruce gave at the 2018 Workshop on Current Issues in Ponded Coal Combustion Products (CCPs). Hosted by the American Coal Ash Association (ACAA) and UK Center for Applied Energy Research (CAER), the workshop took place on March 20-21, 2018 in Richmond, Virginia.

Groundwater Quality Changes After Closure in Place: 25 Years of Observations [PDF]

About Stu Cravens: Stu is a technical director and thought leader in hydrogeology at OBG. A hydrogeologist with 35 years of experience, much of Stu’s work has focused on investigation and management of groundwater issues of coal combustion residuals (CCR) at landfills and impoundments. He currently manages groundwater compliance issues at 52 CCR impoundments and landfills—most recently involving the development of closure plans for eight unlined impoundments. Stu can be reached at: Stu.Cravens@obg.com

About Bruce Hensel: Bruce manages Electric Power Research Institute’s (EPRI) Coal Combustion Products—Environmental Issues program. A hydrogeologist with more than 30 years of experience, much of Bruce’s work has focused on leaching characteristics of CCRs, and groundwater management at CCR landfills and impoundments. Bruce can be reached at: bhensel@epri.com