This European Standard specifies the characteristics of geosynthetic barriers, including polymeric geosynthetic barriers, clay geosynthetic barriers and bituminous geosynthetic barriers, when used as fluid barriers and separation layer in the construction of liquid waste disposal sites, and in the construction of transfer stations or secondary containment for the storage of liquid waste on a waste disposal site only and the appropriate test methods to determine these characteristics. The intended use of these products is to control the leakage of fluids through the construction. This European Standard is not applicable to geotextiles or geotextile-related products as defined in EN ISO 10318-1. This European Standard provides for the assessment and verification of constancy of performance (AVCP) of the product to this European Standard including factory production control procedures. This European Standard defines characteristics to be considered with regard to the presentation of performance. NOTE – Where potable water is or can be in direct contact with the product, other relevant standards, requirements and/or regulations can be considered for the design.