Answer: The answers to your questions will be more involved than I can go into in detail in the space alloted, so I'll just give an overview: you can find the sprinkler system pipes without too much trouble; most run line of sight from one to another. Start by digging the grass and soil away from one of the sprinkler heads and you'll be able to see which direction the pipe runs. Do this with each sprinkler head and you'll have a rough idea of the layout. In Phoenix, I doubt the pipes are more than 3-4" deep (although most systems are about 8" deep). It is possible to convert your system to drip. You can find printed information about the process in the sprinkler system section of your local Home Depot. Hope this information is helpful. Good luck with your renovation project!
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