A 65-year-old Denver man faces felony charges alleging he tampered with a public water system that supplies drinking water to Front Range communities, according to the Colorado Attorney General’s Office.Fabrizio Lorenzin is accused of interfering with infrastructure at the Berthoud Pass Watershed Ditch in Grand County, which is part of a system that diverts Fraser River water to Northglenn and Golden. Remote diversion headgates were repeatedly f…