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Turn on your sprinklers for the zone your leak is on and let it run. The area where the leak is will cause the ground around it to be soaked and water logged more so than any other area. There is your leak.
I would do what Paul said but I would take an additonal step of capping the sprinkler heads where they are easy to get to with a half dozen of 1/2" PVC caps. Then you are increasing the pressure on the leak and you will find it much faster and expend less water.
HDR Remodeling Berkeley Ca
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