Schedule 40 is more than enough. Please really, really think about the 2" 
size. I did this initially and needed to dig it up and replace it with 3" 
or 4" later. No matter how well you plan things, you will need to run more 
cables (or replace old ones) later and this will be almost impossible in 
2".  Also, buy good Dacron cord (twice as long as the conduit) and leave 
it in place as a messenger line. Before installing the cables, stretch all 
of them out on the ground until they lay perfectly flat, with no hint of 
twisting.
Bill - W2WO
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