GSI’s estimating, project management and construction operations are all based in Waukesha, Wisconsin. Individual installation crews operate from locations across the country enabling GSI to provide competitive local service to markets coast to coast.
GSI has the ability to supply all required geosynthetic materials along with the necessary site supervision, skilled technicians, in-house quality control technicians, site labor, deployment equipment, equipment operators, etc., related to the installation of the geosynthetic materials. Our geomembrane lining installation experience with HDPE, LLVPE, PVC, Reinforced Polypropylene (RPP), Hypalon, and XR-5 liners now exceeds over 350,000,000 square feet gathered on literally thousands of projects.
Safety is an essential part of the GSI culture. GSI site Superintendents and lead technicians are OSHA trained and certified. GSI’s diligent focus on safety continues with regular injury preventative practices and attention to working safely throughout the day, week, and year. All of these combine to provide a solid record of safety. This is evident by our current EMR rating of .57.
CCR (coal combustion residuals) is one of the greatest challenges of a coal-fired power station. The CCR is the by-product created while producing electricity. The CCR is disposed of in special waste landfills or ponds that are constructed with many geosynthetic layers, including geosynthetic clay liner(GCL), HDPE liner, geocomposites and geotextiles. These products must be installed by a qualified installer as a cell or pond to contain contaminants. These same products will be used as a cap over the CCR disposal area to encapsulate contaminates.
Drill cuttings from fracking, the rock and soil carried to the surface during the drilling process, are disposed of in special waste landfills that accepts solid wastes primarily related to the exploration and production of oil. Some of these wastes are labeled as TENORM (technically enhanced naturally occurring radioactive material). These wastes are placed inside a geosynthetic lined cell and leachate collection system. The liner system normally consists of three feet of clay meeting a permeability specification. This clay is then overlain by 60 mil HDPE synthetic liner and geocomposite leachate collection system. Leachate is conveyed to a geosynthetic lined evaporation pond for treatment. Final covers normally consists of 18 inches of clay, with a geosynthetic liner and geocomposite followed by 12 inches of subsoil and 6 inches of topsoil.
Textured LLDPE or HDPE geomembrane on a prepared sub grade covered with a geocomposite drainage layer is the most common closure system for closed landfill cells. 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.
Groundwater 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.
Solid Waste Landfills
Today’s modern solid waste landfill is an extremely secure containment for solid waste. They utilize a combination of smooth and textured geomembranes (liners), geocomposites and geosynthetic clay liners. 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 begins with a secondary liner on the prepared subgrade and then a geonet or geomposite on top of that liner. A primary liner is then installed. Finally, another geocomposite is laid down to cover the primary liner 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.
Waste Water Containment
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.
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.
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.
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.