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Always call 811 well in advance of digging.
Call 811 before you dig, blast, bore, trench, drill, grade, or excavate in any way. They will arrange for marking of underground power lines and other utilities so you can keep your distance. White-line your proposed excavation route, so locators can more easily mark the affected utilities.
Never rely solely on your utility maps.
Utility maps are not updated often, and the markings may be off. The one-call center has the most current, most accurate information about buried utilities.
Call 811 well ahead of digging, so underground utilities can be marked and you can work safely.