Record Display for the EPA National Library Catalog

RECORD NUMBER: 19 OF 32

OLS Field Name OLS Field Data
Main Title Model Studies of Electrical Leak Detection Surveys in Geomembrane-Lined Impoundments.
Author Parra, J. O. ; Owen, T. E. ;
CORP Author Southwest Research Inst., San Antonio, TX.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
Publisher c1988
Year Published 1988
Report Number EPA-R-811771; EPA/600/J-88/472;
Stock Number PB90-147760
Additional Subjects Membranes ; Mathematical models ; Site surveys ; Potentiometers(Instruments) ; Electric potential ; Leakage ; Linings ; Portable equipment ; Plastics ; Reprints ; Surface impoundments ; Liquid waste disposal ; Geosynthetic materials
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB90-147760 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/15/1990
Collation 9p
Abstract
Pole-dipole array electrical potential distributions are calculated for a geomembrane-lined liquid impoundment having single or multiple leaks. A three-dimensional numerical model is employed to represent a small circular leak in the highly resistive plastic liner. The liquid waste material, the liner, and the soil under the impoundment are simulated by infinite horizontal layers, with approximate corrections for the finite size of the impoundment. Parametric curves for a single leak show that with optimum selection of electrode spacing and positioning and other field survey parameters leaks can be detected effectively. To identify and resolve the presence of a cluster of leaks, the potential measurements must be made close to the liner and the detector dipole spacing must be smaller than the separation of the leaks. The results also indicate that the survey speed may be increased when portable leak detection equipment employing a vertical dipole detector is used.