Based on the info you have supplied- I would guess it's 3/4" galvanized steel. Probably shallow as it appears you're located in a warm climate?
No easy way to repair it- best to dig up and replace.
Have you checked all visible joints for leaks- including the meter set?
Hey E how do you know he's in warm climate?? ah let me guess green grass no snow??
Experience is Knowing what to do next, Skill is knowing how to do it
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