The company that owns the crude oil pipeline that burst last month in mid-Michigan has no time line for repairing a dented section of pipe beneath the St. Clair River at Marysville, despite a congresswoman's concerns that any spill there could be "simply catastrophic" to metro Detroit's drinking water supply and the environment. U.S. Rep. Candice Miller, whose district includes Marysville, is asking that a Sept. 15 congressional hearing regarding the spill on Enbridge Energy Partners' line 6B near Marshall, which sent 820,000 gallons of oil into a tributary of the Kalamazoo River, be expanded to examine other problems along the line -- including the foot-long dent detected a year ago in the riverbed.