|  | Timeline | Action Needed | 
| 
 | As early as possible |  | If there is a need to use explosives in abandonment operation, discussions should be held with JNCC/DESNZ as early as possible to give consideration to any habitats/species issues under the Habitats Regulations  | 
| As soon as need for suspension or abandonment known |  | Summary of chemical use/discharge must be submitted to DESNZ using a Well Intervention Application (even if already covered in existing drilling (Drilling Operations Application, formerly PON15B) or decommissioning (Decommissioning Operations Application, formerly PON15E) submission.  | 
|  | Any deliberate release of oil planned must be subject to a Oil Discharge Permit. Summary must be included in Well Intervention Application and this will trigger issue of the Oil Discharge Permit  . | 
|  | In exceptional circumstances a licence under Part II of FEPA may be required for deposits to the seabed (e.g. rock dumping to cover wellhead). Details should be submitted on a Well Intervention Application.  | 
| Well Suspension or Abandonment |  |