Workers at several Colorado grocery stores owned by the Cincinnati-based Kroger Company could go on strike as early as next week. About nine-thousand unionized employees of King Soopers and City Market stores are voting by mail on whether to accept a new contract offer drafted by a federal mediator. Results are expected to be announced tomorrow. Union officials are urging workers to reject the contract. If workers reject the proposal, union leaders would have to give five days notice before a strike could begin. If approved, the contract would take effect March 12th -- ending a bitter eight-month dispute. Kroger and other chains lost upwards of two billion dollars during a months-long strike in Southern California in 2003 and 2004.