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A geomembrane system serving as a top or bottom seals is often utilized to isolate contaminants, directly safeguard the environment, or protect against potential future pollution. Bottom seals are notably used in facilities like tank terminals, while a combination of bottom and top seals is often found in landfill sites.
Such sealing processes require execution under a certificate of installation by a certified entity. Since 1997, Genap has maintained the rigorous KIWA certification, underscoring our commitment to quality and environmental protection.
Typically, a 2mm HDPE geomembrane is used for both types of seals. This specification aligns with current guidelines for the use of geomembrane constructions to protect the environment and/or comply with landfill base protection regulations. For top seals, the geomembrane might feature a textured surface to prevent the slippage of the sand layer on slopes. Depending on the project, our engineering department offers tailored advice on the necessary geomembrane for a secure slope construction, including the potential need for additional elements like drainage mats or geogrids.
The desired dimensions and shapes of the geomembrane seal are assembled on-site from rolls of approximately 7 meters wide. Here at Genap, we have the capability to tailor-make openings and fittings for pipelines, concrete structures, and beacon enclosures.
Genap offers various landfill sealing solutions to prevent soil contamination, air, and water pollution.
The ClosureTurf® is engineered to fulfill the long-term required coverage of a landfill across various weather conditions.
Our bottomseals serve as an additional protective layer beneath the storage tanks to prevent leakages and soil contamination.
Geosynthetic clay liners are used as sealing layers in various applications, ranging from water construction projects to landfills and reservoirs.
Genap installed HDPE membrane structures at the Beatrixhaven connection road on behalf of Grondbank Nederland BV to seal incineration bottom ash fillings, thereby protecting the environment. The project included 18,500 square meters of NW20 protection fleece, 18,500 square meters of 2 mm rough HDPE MST/MSB membrane, and
14,000 square meters of drainage mat.
At the sunken eastern ring road N242 in Alkmaar, Genap installed 35,500 square meters of PVC membrane for a viaduct construction. A geotextile was used due to the shell-rich soil. Using a self-developed winch system, the membrane was pulled over water and sunk by its own weight. The leak tightness was subsequently tested by TNO.