As of December important plants covered by the provisions of the regulations in connection with the relevant companies at risk of signifi cant accidents – the rome refi nery, the Common depot (de.Co.) and the depots at trecate and savona – are certifi ed according to international management standards Iso 14001 (environmental management) and ohsas 18001 (Management system for health and safety in the workplace), while the GPl depots controlled by totalgaz are certifi ed by an ISSSRS level 3 accredited third party body, and are on track to obtain ohsas 18001 certifi cation.