I was removing a fence post that had concrete poured in the post hole, as requested by my client. I punctured an irrigation mainline that was buried 4 inches deep, unmarked, and no sprinkler heads in vicinity to give me a clue there was a line there. The line was right up against the post concrete footing, and It appeared that whoever installed the post originally, punctured and repaired the same location. I was not sure what to do about the repair labor and parts costs for the broken line, considered splitting loss with client, then decided to not charge for the repair to the irrigation. Did I do the correct thing not to charge for repair? What should I do to avoid a future mistake, I thought I was being careful at the time.