Ann Arbor – A measure creating new regulations for the drilling of monitoring-wells in Ann Arbor will be revisited in June. City Council Monday night postponed action on the measure after citizens and the Department of Environmental Quality expressed concern over language in the proposal. Councilman Chris Easthope says the fear is that the language is too vague and may be open to unintended interpretations. Attorney's will review the language over the next month and a revised proposal will be submitted to council for consideration at a June meeting. The ordinance proposal followed Ann Arbor's discovery that Pall Life Sciences had drilled a well on private property in the city without notifying city officials. The well is designed to monitor the spread of 1,4-dioxane contamination in the groundwater. The plume has spread out from the Scio Township property of the former Gelman Sciences facility.