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Evaluating Modern Recharge To The Memphis Aquifer At The Lichterman Well Field, Memphis, Tennessee, Michael Ryan Smith
Evaluating Modern Recharge To The Memphis Aquifer At The Lichterman Well Field, Memphis, Tennessee, Michael Ryan Smith
Electronic Theses and Dissertations
The Lichterman well field is a municipal water plant in Shelby County, Tenneessee, vulnerable to vertical seepage of modern groundwater (<60 yrs) into the underlying semiconfined Memphis aquifer. In order to identify probable pathways and sources of modern water, 11 production wells and 1 shallow monitoring well sampled for major solute chemistry,3H,3He, SF6and noble gases. Hydrostratigraphic cross sections reveal potential pathways of modern water leakage to the Memphis aquifer adjacent to the well field. Geochemical inverse modeling estimates up to 14% modern water from sampled production wells. Lumped parameter modeling best fit a piston flow model for regional recharge and dispersion model for local recharge through suspected hydrologic windows estimating fractions of modern water from 14 to 29.5%. Unconfined conditions in the Memphis aquifer and limited saturation of the overlying shallow aquifer may limit vertical leakage of modern water into the Memphis aquifer.
Evaluation And Evolution Of A Groundwater Contaminant Plume At The Former Shelby County Landfill, Memphis, Tennessee, Scott Robert Schoefernacker
Evaluation And Evolution Of A Groundwater Contaminant Plume At The Former Shelby County Landfill, Memphis, Tennessee, Scott Robert Schoefernacker
Electronic Theses and Dissertations
The unlined former Shelby County Landfill in Memphis, Tennessee, lies in the flood plain of the Wolf River and is known to be the source of low-level contamination in the underlying alluvial (shallow) and Memphis aquifers. Prior to closure, discovery of a hydrogeologic window in the upper Claiborne confining unit overlying the Memphis aquifer 0.2 km north of the landfill led to several groundwater investigations by the U.S. Geological Survey to evaluate the threat posed to the Memphis aquifer, the regional source for municipal water supplies. As the landfill nears its 30th year of post-closure monitoring, this study examines the …