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If you carry out activities in the Netherlands that could negatively impact soil quality, you must make arrangements and take measures. By doing so, you prevent contaminating liquids from ending up in the soil or groundwater. You may have to have a liquid-proof or liquid-resistant floor. The (Dutch-language) Soil Protection Guide for Entrepreneurs (Wegwijzer bodembescherming voor ondernemers) will help you determine whether you need such a floor.
Installation and inspection of liquid-proof floors
Once installed, you must have liquid-proof floors inspected by a certified body. The expert inspector must satisfy a number of requirements that are laid down in Recommendation 44 (Aanbeveling 44) of the Centre for Civil Engineering Research and Codes (CUR). Once approved, you will be issued a certificate which is valid for 6 years. Every year, you must check the floor yourself for defects and cracks. You will find a list of inspection companies certified to approve liquid proof floors at the website of Rijkswaterstaat Environment.
Incident management and liquid-resistant floors
If you have a liquid-resistant floor, you must clear up the substances released before they end up in the soil. You are required to carry out management measures, supervision and inspection yourself. This is referred to as incident management.