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NW IN | When installing HDPE drain tile with an excavator, you should over-excavate and put 4" of stone below. Rake it to grade and then just cover the pipe with stone. You're using perforated pipe so the stone above is not as critical. If you use solid pipe, use 6" of stone above as that is what will carry the soil load, not the pipe. This assumes a clay soil? Sandy/gravel sols are more forgiving, but your location in Northeast tells me probably clay.
HDPE pipe is a flexible conduit and very sensitive to installation. A little bit of thought will go a long ways for you in not having to do it again.
Preferred stone is a washed limestone. Clean #8 (1/2" to 3/4" chips) with no fines. Pea gravel is ok in this situation. Can use sand and compact, but only on solid pipe or you'd need sock filter on the pipe to keep sand out of the pipe.
Backfill sensibly and let the trench settle with rain. Don't bulldoze it shut with a D8 and pack it down for good measure.
Good luck and hopefully you get your field dried up!
Edit: if you want to look up ASTM D2321, it is the standard for excavator installation of corrugated HDPE pipe. Might be worth buying a copy. You'd be amazed at what I've witnessed in the field for installation.
Edited by Tileman2 11/6/2015 15:28
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Proper way to install field tile
