Unless there is some unusual circumstance, PVC schedule 40 is fine for typical pipe sizes like 4 or 6 inch diameter. Installation is pretty simple, dig a trench about six inches wider than the pipe (a foot wide for 4 or 6 inch pipe), and appropriate depth, place a layer of approximately 6 inches of 3/4 inch crushed stone in the bottom of the trench, compact the stone using a plate whacker, install pipe (glue joints if necessary, or use push on pipe if appropriate), cover pipe with 6 inches of crushed stone, compact lightly, fill to grade with ordinary backfill, compacting in six inch lifts.
The only real issues are make sure the pitch of the pipe is correct, this is usually done with a laser or a level. Also, do not backfill over or under the pipe using large, sharp stone as this can damage the pipe, some people use coarse sand, however crushed stone is fine as well. Call Dig Safe BEFORE you dig, get the permit, it is free. Also, since you will be four feet deep at one point, remember to cover the trench as you go, a 4 foot deep trench can be very dangerous if left open, a child or animal could fall in, or someone walking in the yard could break a leg.
One other detail, if you are in a cold climate, the pipe could freeze at the end where it is only 1 foot deep, consider making it deeper to minimize frost problems.
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