Installing a geomembrane low to high gradient?

April 1st, 2021

Q: We are a large liner installation firm that has been asked to install a geomembrane liner from low gradient to high gradient. Is this the new normal? A: This is not normal, and we suggest you strongly object to this recommendation. There are many stakeholders in regard to panel layout (i.e., installer, general contractor, […]

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GRI-GM19 peel specification

April 1st, 2021

Q: Our liner system is a double composite and along a western tie-in. We need to extrusion-weld the secondary 60-mil (1.5-mm) HDPE (new cell) to an existing secondary 40-mil (1-mm) HDPE (old cell), and the state is continuing to have issues with the fact that we are using the 40-mil (1-mm) GRI-GM19 peel specification as […]

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Reviving the Palos Verdes Reservoir—Part 4

August 1st, 2019

By John Heap and Chris Kelsey The active site work for the Palos Verdes Reservoir’s substantial update began in late 2016, advanced primarily throughout 2018 and concluded in the second quarter of 2019 with the filling of the reservoir. The project was immense for everyone involved, and with that has come the expected excitement, challenges […]

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The GMA Techline

April 1st, 2019

Vegetation causing gases under geomembrane? Q: I have a site where we are installing a high-density polyethylene (HDPE) liner in an existing pond. Because of some residual heavy metals in the top layer of soil, I would like to strip off the top 3–6 inches (7.6–15.2 cm) of soil and vegetation. Alternatively, we could mow and […]

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A leachate pond geomembrane after 25 years of service

February 1st, 2019

This article reports on the evaluation of an exposed geomembrane liner in a landfill leachate pond after being in service for 25 years. The evaluation was performed in two campaigns: in August 2014 and in May 2018. The purpose of the evaluation was to determine the condition of the geomembrane and to provide a recommendation […]

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Reviving the Palos Verdes Reservoir, Part 3

February 1st, 2019

California’s water infrastructure is one of the most challenged systems in the United States due to the large population it supports, the age of much of the water infrastructure, and the diverse environments—mountains, coastlines, old-growth forests, deserts—found in the state. The water infrastructure is also one of the country’s most advanced systems, in part due […]

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Act Global and Solmax release next generation of LiteEarth capping system

January 29th, 2019

Act Global and Solmax announced the launch of the next generation LiteEarth PE capping system. LiteEarth is a patented synthetic-grass capping system developed for long-term closure of solid and hazardous waste landfills, coal ash, mining containment sites, and other land reclamation projects. “We have engineered the next generation of a truly sustainable and efficient system,” […]

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Minnesota Pollution Control Agency updates geosynthetic liner guidelines for stormwater management

August 30th, 2018

The Minnesota Pollution Control Agency (Minnesota PCA) revised and released new geosynthetic liner guidelines for stormwater management in August. The guidelines specify where liners are required and where liners are recommended, liner specifications (e.g., HDPE, GCL, PVC), and how to select an appropriate liner. “Liners are designed to limit infiltration of water from a stormwater […]

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A next-gen basin liner solution for the U.S. Army Corps of Engineers

April 1st, 2018

There are more than 100,000 miles (> 160,000 km) of levees throughout the United States, protecting lives and property from extreme weather-related flooding. Aging infrastructure and increasingly stronger storms have intensified the need to reinforce and protect levees, and emergency responders need solutions to repair a breached levee before it results in catastrophic damage. Therefore, […]

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GMA announces Waste Containment System Design technical seminar in Syracuse in April

March 8th, 2018

On March 7, 2018, the Geosynthetic Materials Association (GMA) announced the opening of registration for a technical seminar on “Waste Containment System Design” at the Crowne Plaza in Syracuse, New York, April 17–18, 2018. The technical seminar will identify how vertical expansions of landfills can raise a number of engineering concerns that must be evaluated […]

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