The EPSA West contract area - previously known as Concession 11 - is located in the Sirte Basin. The block consists of a number of fields of which Ghani, Zenad, Facha and Ed Dib are the largest. The fields have been in production since the 1980s, initially peaking in 1980 at 43,700 b/d. Production quickly declined, and smaller satellite tie-ins were required to maintain production through the 1990s. Since 2000, Petro-Canada embarked on a programme of development drilling, intervention and water injection. In June 2008, Petro-Canada signed new contracts for its Libyan concessions whereby existing concession licences were converted to EPSA IV terms and a 30 year licence extension was granted. There are now six EPSA contracts areas (EPSA North, EPSA West, EPSA Central, EPSA East, EPSA South East and EPSA South), five of which are producing. Petro-Canada paid a US$1 billion non-recoverable signature bonus as part of the deal, over a five-year period.