The Denver City Council unanimously approved a measure Tuesday that will underline and expand the authority of the Office of the Independent Monitor, potentially resolving a conflict about the independent agency. The OIM, which is part of the city, monitors the disciplinary process for law-enforcement officers and recommends policy changes. Last year, though, Mayor Michael Hancock’s administration excluded the office from part of a review involving former Police Chief Robert White. The new bill gives the OIM the express power to monitor investigations into the police chief and sheriff.