Measuring and testing – With fluid pressure – Leakage
Patent
1992-05-13
1993-12-28
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73 492, 588260, 250253, 25039005, 405 54, 405 55, G01M 304, G01N 2300
Patent
active
052729109
ABSTRACT:
A vadose zone monitoring system for detecting leaks from a contaminant storage facility or the like is disclosed in which leaks are detected in a confined radial area around at least one generally horizontal, neutron access tube disposed under the landfill. A wicking layer of material increases the leakage detection coverage area by laterally transmitting leakage to the access tube via capillary action. A clay liner may be disposed between the landfill and wicking layer for controlling the rate of leakage to prevent build-up of a pressure head large enough to force liquid through the wicking layer before it is conducted laterally to the access tube. Leak detection may be carried out by neutron moderation techniques or other moisture detection schemes for developing logs indicative of the leakage from the landfill. The wicking layer permits an entire network of access tubes or other leak detection means to be installed under substantially the entire landfill for monitoring leaks therefrom.
REFERENCES:
patent: 5155356 (1992-10-01), Peters et al.
Kramer, John H. et al., "Proactive Post-Closure Vadoze Zone Monitoring Strategy Using Neutron Logs," GRCDA's 20th Annual Western Regional Solid Waste Management Symposium Apr. 1990.
Brose, Richard J. et al., "Neutron Monitoring in the Unsaturated Zone," LeRoy Crandall & Associates, May, 1986, pp. 455-467.
Bumb, Amar C. et al., "Design of Lysimeter Leak Detector Networks for Surface Impoundments and Landfills," Focus, Apr., 1988.
Kramer, John H., "Contamination Investigations Using Neutron Moderation in Grouted Holes--A New Cost-Effective Technique," Kendall/Hunt Publishing Co., Mar., 1990, pp. 234-242.
Frind, Emil O. et al., "Application of Unsaturated Flow Properties in the Design Geologic Environments for Radioactive Waste Storage Facilities," Department of Earth Sciences, Univ. of Waterloo, Ontario, Canada, Jun., 1977.
Yeh, C. Jim et al., "Stochastic Analysis of Unsaturated Flow in Heterogenous Soils," American Geophysical Union, Apr., 1985, pp. 465-471.
Cullen Stephen J.
Everett Lorne G.
Kramer John H.
Brock Michael
The Regents of the University of California
Williams Hezron E.
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