Accession Number : ADA332736

Title :   Field and Laboratory Studies of Pulsed Pumping for Cleanup of Contaminated Aquifers.

Descriptive Note : Rept. for Apr 93-Mar 97,

Corporate Author : WATERLOO UNIV (ONTARIO) DEPT OF EARTH SCIENCES

Personal Author(s) : McKay, Douglas M. ; Wilson, R. D. ; Brown, M. J. ; Ball, William P. ; Durfee, Donald P.

PDF Url : ADA332736

Report Date : 28 JUL 1997

Pagination or Media Count : 219

Abstract : A field-scale investigation of pump-and-treat remediation was conducted at Dover AFB, DE, in sheet-pile test cells isolating two adjacent segments of a long-extant groundwater plume. For a given volume of extracted water, the fractional removal of contaminant mass was higher for the pulse pumped cell (PPC) than the continuously pumped cell (CPC) for all contaminants whose maximum aquifer concentrations were at or very near the aquiferlaquitard interface. Overall, the results of this work indicate that contaminant transport and subsurface remediation are influenced not only by (I) spatial variability of the transport medium (aquifer), but also by (2) spatial variability in the pre-remediation contaminant distribution, and (3) spatial variability of the sorption properties of the impacted low permeability media (aquitards, clay lenses, etc.). The results of this work have been and will continue to be extrapolated from Dover-specific conditions to a variety of hydrogeologic situations via modeling to emphasize the effects ofaquitard and initial" contamination heterogeneity on long-term remediation by any method constrained by diffusion of contaminants from low permeability media.

Descriptors :   *LABORATORY TESTS, *CHEMICAL CONTAMINATION, *AQUIFERS, *CLEANING, SPATIAL DISTRIBUTION, GROUND WATER, MASS TRANSFER, SAMPLING, CONTAMINANTS, SOLVENTS, EXTRACTION, WATER TABLE, TRICHLOROETHANES, PERIODIC VARIATIONS, ORGANIC CHEMISTRY.

Subject Categories : Physical Chemistry
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE