Standardization News

A new ASTM International practice standardizes a geoelectric method used to detect potential leaks in exposed electrically isolating membranes in the field in containment applications.

The new standard, D7703, Practice for Electrical Leak Location on Exposed Geomembranes Using the Water Lance System, is under the jurisdiction of Subcommittee D35.10 on Geomembranes, part of ASTM International Committee D35 on Geosynthetics.

According to Tim Bauters, P.E., Ph.D, and senior engineer, Golder Associates Inc., and first vice chairman of D35, many modern landfill cells, lagoons, impoundments and ponds are lined with synthetic materials such as high density polyethylene or polyvinyl chloride to prevent leakage. However, even with the most advanced construction quality control during installation, many, if not most geomembrane liners have leaks from imperfectly welded seams, from stress on seams or puncture during installation of overlying earthen materials.

"Particularly for new landfill cells, leachate lagoons or waste impoundments, rapid and accurate detection and pinpointing of leaks can prevent costly site closures, delayed permitting/opening and, in the worst case, cleanup costs," says Bauters. "Even for ponds containing benign materials such as irrigation or drinking water, leaks can cause costly site damage from washouts or sinkholes as well as loss of revenue."

Using D7703 to geoelectrically test the geomembranes prior to placing the containment system in operation will minimize the amount of leakage. The new standard will be used by regulatory agencies, designers of containment systems, owners and geoelectric surveyors.

All parties with an interest in geomembranes are invited to participate in the ongoing standards developing activities of D35.10.

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CONTACT Technical Information: Tim Bauters, P.E., Ph.D., Golder Associates Inc. • Sunnyvale, Calif. • Phone: 408-220-9223 O ASTM Staff: Christine Sierk • Phone: 610-832-9728 O Upcoming Meeting: Feb. 1-3 • January Committee Week • Atlanta, Ga.