I'm surprised galvanized was even allowed for underground 36 years ago. Code here was copper or poly. Still is, but I think they allow PEX now.
I'd put 3-4" of sand in the trench then the poly then cover with another 4" of sand then backfill.
You can use PVC for a conduit but it really isn't needed. If I was going to go to the trouble of using PVC for a conduit I'd do as someone suggested and use 4" with drainage EL's to facilitate pulling a new service if needed. Do not use PVC for the service!
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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