ABSTRACT
Depth-discrete groundwater and soil-core sampling was performed at an industrial site on a sand aquifer in Florida where releases of trichloroethylene (TCE) between 1965 and 1977 formed suspended DNAPL source zones and a dissolved plume. The Waterloo Profiler driven by an Enviro-Core direct-push rig was used at 25 locations to determine the stratigraphy and extract discrete-depth groundwater samples at a vertical spacing as close as 15cm. Permanently installed multi-level bundle samplers and continuous cores were also used to determine concentration profiles. Dissolved TCE concentrations varied a maximum of 4.5 orders of magnitude over a vertical interval as small as 30cm. Although cis-1,2,DCE appears along the flow path due to degradation, peak TCE concentrations decrease from solubility (1,500 mg/L) to less than 1% solubility within a downgradient distance of 40m with much of the attenuation being attributable to transverse vertical dispersion.
