On Dec 1, 11:28*am, Znott wrote:
I just dug up a bunch of clay soil/rock to get to all of the sprinkler
value piping underneath the anti siphon values and it took way too
long and tiring. *Any recommendations on what type of soil I should
replace it with so that I can easily dig up the same area for any
future repairs?

Mix leaves or clippings with the clay and it will turn to good dirt,
mix clay and sand and get cement, maybe thats what you have now, a
clay sand.