Landfill Plöger Steinbruch OFA STRABAG Umwelttechnik GmbH Landfill construction Landfill Plöger Steinbruch OFA Fact City (country): Velbert (Germany) client: Deponiebetriebsgesellschaft Velbert mbH, Velbert contractor: STRABAG Umwelttechnik GmbH (former HEILIT Umwelttechnik GmbH) engineering: Geotechnisches Büro Prof. Dr.-Ing. H. Düllmann GmbH, Aachen Contract value: 3.15 million EUR Construction period: 5/2010 ─ 4/2012 Construction of a surface sealing system of approx. 6 ha: Gas drainage layer 35 cm Base layer 15 cm Bentonite mat Geomembrane 2.5 mm Drainage mat Geogrid Rekultivation layer 1.0 m