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FABTECH unveils Southern Hemisphere’s largest floating cover
February 2nd, 2023
Fabtech recently unveiled the Southern Hemisphere’s largest floating cover as stage 1 works at Sydney Water's Potts Hill Reservoirs in New South Wales, Australia nears completion. FABTECH was awarded the contract to supply, design and install the new liner and cover. To continue to provide drinking water to its residents, Sydney Water required the inner […]
AASHTOWare unveils Pavement 3.0 software
February 1st, 2023
The American Association of State Highway and Transportation Officials (AASHTO) recently issued AASHTOWare Pavement ME Design 3.0, the latest version of its core pavement design software platform. AASHTOWare – which offers a suite of transportation software products delivered through a collaborative business model with state departments of transportation across the country – upgraded its pavement design […]
Landfill Gas Emissions Modeling
February 1st, 2023
Q: I’m writing to see if you are aware of any research on landfill gas (LFG) emissions modeling through various geomembranes, particularly for temporary covers? A: Landfill gas modeling is the practice of forecasting gas generation and recovery based on past and future waste disposal histories and estimates of collection system efficiency. It is an […]
The final IFAI Expo and my first Lobby Day
February 1st, 2023
October and November 2022 turned out to be memorable months as I had the chance to experience our final IFAI Expo in Charlotte, N.C., and my first—but our final—Lobby Day in Washington, D.C. You’ll find more about Lobby Day in the Update section and GMA column. As of next year our annual association event will […]
Overlap seam specifications for geotextile separators
February 1st, 2023
Q:What is the typical overlap for a geotextile used as a separator in a highway project? A: This is a very simple question requiring an involved answer. Overlap seam specifications for geotextile separators are all over the place depending on material type and application. It is best to check the plans and specification, consult the […]
Transitioning from 30 MIL PVC geomembrane to 60 MIL HDPE
February 1st, 2023
Q:I have a client that operates a Subtitle C landfill that utilizes a double-liner system of 30 mil (0.76mm) PVC geomembrane for the base liner. They are wanting to evaluate the possibility to transition from 30 mil (0.76 mm) PVC to 60 mil (1.52 mm) high-density polyethylene (HDPE) geomembrane for the base liner system. In […]
Strength Reduction Of Geogrids Used In Reinforced Walls
February 1st, 2023
Q:At the moment there are two issues that create uncertainty with the use of PET fabrics and geogrids in the Netherlands. First, for many years we built pile-supported geosynthetic reinforced embankments (so-called piled mattresses to reduce settlements under embankments on soft soils). The fill is supported by a geosynthetic mat, which rests on top of […]
Geomembranes with better performance
February 1st, 2023
Q:We are researching liner alternatives for an industrial client that will have lined impoundments subject to high temperature influent (>140 degrees F), low pH (1 SU+/-), and may have organic contaminants. Are there any polyethylene geomembranes that meet these requirements? A: Thank you for your question about geomembranes with better performance than GRI GM13 GMB […]
Fall Lobby Day 2022 and GMA Leader of the Year
February 1st, 2023
GMA Chair Bryan Gee, left, and GMA Executive Director Fred Chuck, right, present House Transportation and Infrastructure Committee Chair Peter DeFazio with the Geosynthetic Materials Association Leader of the Year Award. Photo courtesy of U.S. House of Representatives Committee on Transportation and Infrastructure Lobby Day 2022 took place on November 16, 2022, in Washington, D.C. […]
Vegetated long-term solution for fly ash landfill capping project
February 1st, 2023
Figure 1 Retired fly ash landfill with vegetated swales reinforced with a TRM In 2019, a coal-fired power plant in Illinois was scheduled to be retired. The decision to close the plant was made to address the recently approved revisions to the Multi-Pollutant Standards rule from the Illinois Pollution Control Board. As a part of […]