Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Rate of flow of leachate through clay soil liners /
Other Authors
Author Title of a Work
Daniel, David E.
Publisher U.S. Environmental Protection Agency, Risk Reduction Engineering Laboratory,
Year Published 1991
Report Number EPA/600-S2-91-021
OCLC Number 643117948
Subjects Leachate. ; Geomembranes.
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-S2-91-021 In Binder Headquarters Library/Washington,DC 05/15/2018
EJBD  EPA 600-S2-91-021 In Binder Headquarters Library/Washington,DC 11/02/2018
ELBD RPS EPA 600-S2-91-021 repository copy AWBERC Library/Cincinnati,OH 07/11/2017
Collation 3 pages ; 28 cm
Caption title. "July 1991." "EPA/600-S2-91-021." At head of title: Project summary.
Contents Notes
"The objective of this research was to measure the time of travel (TOT) of inorganic solutes passing through laboratory columns of compacted clay and to compare measured and predicted TOT's. Two clay soils were used: kaolinite and Lufkin clay. Anionic tracers were chloride and bromide; potassium and zinc were the cationic tracers. Column tests were used to measure the TOT of tracers and to determine the effective porosity ratio, which is defined as effective porosity divided by total porosity, of the soils. The effective porosity is equal to the volume of the void space that conducts most of the fluid flow divided by the total (bulk) volume of the soil. The effective porosity ratio Increased with increasing hydraulic gradient in kaolinite from a low of about 0.25 at a gradient of 1 to a high of 1 at a gradient of 20. With Lufkin clay, the effective porosity ratio was between 0.02 and 0.16. Breakthrough times were controlled much more by the low effective porosities than by molecular diffusion. The computer program SOILINER, which was developed by EPA for predicting TOT's through soil liners, predicted TOTs that were larger than actual TOT's by a factor of up to 52. The failure to account for effective porosity ratios less than 1 was the cause for the poor predictions from SOILINER."