The Hogan administration has proposed rules that would prohibit the gas-drilling technique known as fracking within 2,000 feet of a private drinking water well, require steel casings around gas bores to a depth of 100 feet, and require energy companies to replace any water supply that is contaminated by the practice. The Maryland Department of the Environment submitted the measures to a legislative committee that reviews regulations, a year before a state ban on fracking ends. The plan was unveiled five days ahead of the Oct. 1 deadline set by lawmakers for the rules to be formally adopted. Department of the Environment officials now expect the approval process to finish by the end of the year instead. Secretary Ben Grumbles said the rules “will be the most stringent and protective environmental shale regulations in the country.”