Interior Secretary Ken Salazar said Tuesday his department would formally unveil its highly anticipated rules for hydraulic fracturing on federal lands in “a few weeks.” The Interior Department has worked on a trio of rules that would require companies operating on federal lands to disclose the chemicals in their fracturing fluids (with a trade-secret exemption), impose standards meant to ensure wells can withstand fracturing and require companies to explain how they plan to dispose of flowback water. “If we are going to be successful, the public needs to have confidence that fracking operations are being conducted safely, and that drinking...