【摘要】Successor to smelter may not bring Comprehensive Environmental Response, Compensation, and Liability Act contribution claim against chemical plant operator for contaminated site cleanup costs, because: (1) under CERCLA three-year statute of limitations applies to contribution claims, (2) settlement agreement successor entered into with other companies under CERCLA more than three years before filing claims triggered statute of limitations, (3) agreement addressed all response costs at site, and (4) successor\'s subsequent bankruptcy settlement fixing its costs for site did not create new contribution claim or revive expired claim.