Found what appears to be an old patio consisting of 2"x6"x12" pavers under a customers lawn. They seem to be in a 20'x20' square area and are between 2" and 4" below the surface. The grass seems to be growing fine, although the grass roots really mat up on top of the pavers. Customer wants them removed now that we've discovered them. What is your opinion, would you remove them, tearing up the lawn to get them out, or leave them?