King Soopers and the union representing 12,000 of its employees remained locked in marathon contract negotiations Saturday, with no agreement in place as day turned to dusk. In a statement, King Soopers said the union proposal remains non-competitive in the Colorado market, while the The United Food and Commercial Workers Local 7 union said on Facebook that the company’s most recent offer “continued to fail to address the basic concerns of workers and Local 7 members.” This was the first the time two sides returned to the table since March 7, when negotiations broke down, leading to a union strike vote.