CPV code 90715120 designates Chemical works or oil refinery waste site investigation in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
90715120 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 90715100 (Chemicals and oil pollution investigation services).