Flags and paint markings are utilized to identify the location of underground utilities. State law requires that utilities are located through the Gopher State One Call system prior to excavation activities to help avoid damage and accidents caused by striking the buried lines. These activities could include repair of sewer and water services, damaged cable, or phone lines, or even installation of new utility lines. These markings will also appear if a property owner in the area is making an improvement to their property. Two days before doing any digging in your yard it is required by State law to contact: Gopher State One Call - 800.252.1166.