A coalition of environmental groups that had warned Oroville Dam’s emergency spillway was fatally flawed long before it nearly washed away this winter is demanding that federal regulators open up dam repair plans for public vetting. In a filing Wednesday with the Federal Energy Regulatory Commission, a coalition of environmental groups led by Sacramento-based Friends of the River also said it was concerned that the state Department of Water Resources is only going part way in repairing the emergency spillway.