century aluminum company amended and restated supplemental retirement income benefit plan table of contents page purpose 1 effective date 2 type of plan 2 eligibility 2 amount of supplemental retirement income benefit 2 vesting 4 time and form of upb payment 5 time and form of vested erb payment 6 section 409a 7 surviving spouse erb benefit 8 source of benefit payments 8 administration of the plan 10 claims and review procedure 10 amendment or termination of the plan 13 general provisions 14 execution 14 appendix a 15 table of contents table of contents page page purpose 1 effective date 2 type of plan 2 eligibility 2 2 amount of supplemental retirement income benefit 2 vesting 4 time and form of upb payment 5 time and form of vested erb payment 6 section 409a 7 surviving spouse erb benefit 8 source of benefit payments 8 administration of the plan 10 claims and review procedure 10 amendment or termination of the plan 13 general provisions 14 execution 14 appendix a 15 century aluminum company amended and restated supplemental retirement income benefit plan 1. purpose. the purpose of the century aluminum company amended and restated supplemental retirement income benefit plan ( the “ plan ” ) is : ( a ) to provide an annual retirement benefit for life to certain executives of century aluminum company and its affiliates ( collectively, the “ company ” ), equal to any annual benefit which would have accrued to the executive under the company ’ s tax qualified defined benefit pension plan covering salaried employees ( the “ pension plan ” ) if the annual benefit and compensation limits imposed by applicable tax law were not applicable and if the calculation of “ final average monthly compensation ” under the pension plan was modified in certain respects ; and ( b ) to provide enhanced supplemental retirement income benefits for life to certain executives of the company whose projected annual retirement income for life starting at their target retirement age, as determined by the compensation committee of the board of directors of the company ( “ compensation committee ” ), ( “ target retirement age ” ) under the pension plan as supplemented by any benefit described in paragraph ( a ) above ( “ nonenhanced pension plan income ” ) is estimated to be less than a specified percentage ( between 40 % and 60 % ) of the executive ’ s projected average annual pay ( base pay plus annual cash bonus ) during his final year of service ( “ targetedretirement income ” ) due to the executive ’ s age and potential years of service at target retirement age. - 1 - - 1 - - 1 - 2. effective date. the plan shall be effective