Digging deck footers close to utilities?

Hi. DIY'r here. Just had utilities marked out by 811 and unfortunately there's an electrical line running diagonally through my planned deck area. I can get away with digging footings within the standard 18" tolerance zone, but my question is this... is 18" still too close for comfort? How... show more Hi. DIY'r here. Just had utilities marked out by 811 and unfortunately there's an electrical line running diagonally through my planned deck area. I can get away with digging footings within the standard 18" tolerance zone, but my question is this... is 18" still too close for comfort? How close will you guys typically go? I'll be hand digging... what are the odds I break through the conduit or whatever protects the line if I hit it? Thanks!

Jason
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