Textured LLDPE or HDPE geomembrane on a prepared subgrade is the most common closure system for closed landfill cells.  Then the geomembrane is covered with a geocomposite drainage layer. These two layers of geosynthetic products are then covered with a soil cover, which is seeded to prevent soil erosion. The geomembrane prevents the infiltration of rainwater and also prevents methane gas from escaping into the atmosphere. The geocomposite transports the rainwater that seeps through the soil cover to collection piping which in turn carries the water away from the closed cell. Many of these closed landfills have been turned into recreational areas.

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Utilizing a combination of smooth and textured geomembranes (liners), geocomposites and geosynthetic clay liners, today’s modern solid waste landfill is an extremely secure containment for solid waste. These products have replaced natural materials such as sand and clay and have offered a much higher quality and more secure containment of solid waste. A very common landfill base liner system design is to place a secondary liner on the prepared subgrade and a geonet or geomposite on top of that liner.   A primary liner is then installed over that layer.  Finally, another geocomposite is laid over that layer. The geonet or geocomposite that is between the liners is for leak detection, and the geocomposite over the primary liner is for leachate collection and transportation to sumps.  In the sumps the leachate can  be collected and treated. GSI has vast experience in the supply and installation of these products in landfill applications throughout the country.

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Goundwater and soil contamination prevention is a challenge that various manufacturers and industries are forced to deal with. GSI installs geomembranes quickly for a variety of secondary containment applications including large concrete basin lining. We have a wide range of materials with varying levels of chemical and uv resistance to suit all secondary containment needs.

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Many Waste Water Treatment Plants (WWTP) utilize ponds in their treatment process. These ponds are usually required to be lined.  The most common liners used are HDPE, Polypropylene and PVC.  The geomembrane prevents the seepage of contaminated liquid waste into the groundwater.

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Many companies use industrial ponds and artificial lagoons (evaporation, holding, cooling, retention, firefighting and sludge treatment ponds) in their treatment process. These ponds are usually required to be lined. The most common liners used are HDPE, Polypropylene and PVC. The geomembrane prevents the seepage of water or contaminated liquid waste into the groundwater.

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Some golf courses have manmade ponds to enhance the beauty of the course and to challenge the player. Many of these ponds are lined to help maintain the water level and to improve the water quality. The liner is covered with a soil and then grassed to the waterline. Almost every kind of liner is utilized in this application, as there is no chemical compatibility problem, nor is there a UV concern as the liner is not exposed to sunlight.

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In some areas of the country methane gas occurs naturally and can percolate into buildings, causing a potential gas explosion if ignited. Methane gas can also migrate from active or closed landfills. In these areas of risk, geomembrane liners can be placed under the concrete foundations and floors.  Any gas that is generated under the building is transported under the liner (usually in  a sand and perforated pipe layer) and then vented safely to the outside of the building.