With the rough plumbing done the dirt needed to be repacked before the concrete foundation could be poured. Our sub-contractor rented a tamper which W and I picked up. He came by on Day 24 to do the first round of tamping.
After the tamper we put up the sprinklers again. This time that ran overnight. The next morning the sub-contractor came back to run the tamper over it once more. At the end of the second tamping we were officially ready for the concrete to be poured.