How long will my liner last?

October 1, 2008

What is the remaining service life of my HDPE geomembrane? By Ian D. Peggs, P.E., P.Eng., Ph.D. Introduction In his keynote lecture at the GeoAmericas-2008 conference last March, Dr. Robert Koerner (et al., 2008) of the Geosynthetic Institute (GSI) reported the ongoing Geosynthetic Research Institute (GRI) work to make the first real stab at assessing …

Thrace adds new nonwoven line

Thrace-LINQ, a 100% subsidiary of The Thrace Group, has announced the investment of $20 million in new equipment at its Summerville, S.C. facility. Included in the purchase will be the installation of a new needling line, supplied by NSC nonwoven (Asselin-Thibeau), to increase production capacity and help further expand the company’s U.S. market. The new …

Wisconsin city receives gift from Propex

Lake Delton, Wis., has accepted donation of geosynthetic material that could help several of the city’s civil engineering projects. Tennessee-based Propex offered the small Wisconsin Dellsarea town $100,000 worth of erosion-control material. Earlier this year, the artificial “lake” in Lake Delton disappeared in the wake of devastating flooding in central Wisconsin. Propex donated 5,000yd2 of …

CETCO introduces new geosynthetic clay liner product

CETCO has introduced a new geosynthetic clay liner product that combines the benefits of its needlepunched GCLs with the pricing of its adhesive GCLs, according to a company press release. Bentomat 200R is manufactured with a 3.5oz-per-yd2 nonwoven polypropylene cap fabric that is needlepunched into a 3.2oz-per-yd2 woven polypropylene base. The new product contains 0.75lbs …

Propex appoints Brant VP/COO

Stan Brant has been named executive vice president and chief operating officer of Propex Inc. Worldwide. Woody McGee, president and CEO, said that for Propex to successfully emerge from and thrive after Chapter 11, it is mandatory that the company have leaders in place who understand all aspects of the business and can take the …

FHWA icon retires

Jerry DiMaggio, Federal Highway Administration principal bridge engineer/geotechnical, retired Oct. 3 after a 33-year career with the agency. DiMaggio will continue to be active in post-FHWA retirement as he has accepted a position with the National Academies Special Project Division where he will be the implementation manager of the Strategic Highway Research Program 2. A …

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Under the green roof: Ground control in northern California

Stabilizing a “living roof” with biodegradable geotextile: Interlocking plant trays help the new California Academy of Sciences building blend into hilly surroundings. By Shelby Gonzalez Introduction Lead architect Renzo Piano envisioned the new California Academy of Sciences (CAS) building as an organic part of its setting, San Francisco’s Golden Gate Park. So his design crowned …

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Geosynthetics and the new I-35W Bridge

Examples of the geosynthetic materials used on the I-35W project. By Ron Bygness, and courtesy of Flatiron Corp., Maccaferri Inc., and MnDOT Construction of the Interstate-35W Bridge, which collapsed in catastrophic fashion on Aug. 1, 2007, was completed ahead of schedule, and reopened on Sept. 18, 2008. Geosynthetic materials of all types were used in …

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Reviving the Wrigley Reservoir on Catalina Island

A new liner, a floating cover, and a wildfire. By Andrew Mills Introduction There are times when an unusual project turns into one that is absolutely unique, literally “one of a kind.” That’s exactly what happened on a water reservoir project off the west coast of California on Catalina Island. This project was interesting enough, …

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Researchers test sediment-scrubbing technology

The testing was conducted at the Cocheco River in New Hampshire. By Beth Potier In a mud flat at the edge of the Cocheco River, just outside downtown Dover, N.H., scientists from the University of New Hampshire’s Contaminated Sediments Center are testing an innovative way to treat polluted sediment in coastal waterways. Rather than dredging …