|New ASTM Guidance Takes the Headache Out of Finding Leaks in Installed Geomembranes |
Geomembranes that typically contain waste in landfills can become damaged during installation or dumping of materials. These membranes also line ponds, reservoirs, tunnels, dams, canals, roads, and railroads.
In April, ASTM Committee D35 on Geosynthetics issued new guidance for locating leak paths in installed geomembranes by electrical methods. D 6747, Standard Guide for Selection of Techniques for Electrical Detection of Potential Leak Paths in Geomembranes, describes options for detecting leaks from punctures, seam defects, cracks, and similar faults.
Reports that leaks per hectare averaged approximately 14.5 prompted an ASTM working group to describe features and limitations of available techniques in standard D 6747, says Andre Rollin, Ph.D., Ing., director, Interface to Industries, Solmers International Consultant, Longueuil PQ, Canada.
The standard also describes the speed of survey, and other issues related to installed geomembranes. These techniques are very important to check the integrity of an installed geomembrane, says Rollin, the working-group chairman.
Fifteen to 20 individuals participated in the standards development from Canada, Czechoslovakia, England, France, Korea, and the United States, Rollins says. Consulting firms, installers, manufacturers, testing laboratories, academics, Departments of Transportation, and the U.S. Bureau of Reclamation also participated, he says.
The working group hopes the guide will establish the usefulness of the techniques, and intends that the standards leak detection surveys become part of rigorous construction quality assurance programs.
The working group is developing specifications for each type of electrical leak-detection technique. On behalf of the committee, Rollin invites individuals to develop standards with the group, which will assemble during the meetings of Committee D35 in Albuquerque, N.M., Jan. 16-18.
For further technical information, contact Andre Rollin, Ph.D., P.E., Solmers International Consultant, Longueuil PQ, Canada (phone: 450/ 448-0870). For Committee D35 meeting or membership details contact Maxine Topping, manager, Technical Committee Operations, ASTM International (phone: 610/832-9737). //
Copyright 2002, ASTM