In n MN I have only used 100 psi poly from Menards, but we have to put it down 6-7 feet or blow it out, and I have never had a problem. My Father put black poly in the ground 65 years ago and to my knowledge it is still working fine, just can't put any big rocks on top of it! The last one we did went under a driveway so I put sand over it and then blue foam insulation. When you keep the snow plowed and drive on it 7 ft. might not be deep enough!
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