Got the trench filled as it started to drizzle.

Only had one minor problem, I seem to have miscalculated the depth needed for the sprinkler heads, so they stick up about 1-2 inches from the dirt. But I think once the grass grows back they won’t be as noticeable. I’ll just have to go around them with the mower. But it’s something I can live with for a $150 DIY project (minus trench rental). :-)