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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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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