On Thu, 27 Jun 2013 04:20:17 +0000 (UTC), "Danny D."
wrote:

These tubes are popping up out of the ground near a buried sprinkler
box. I'm sure they go to the sprinkler system, but I haven't
dug it all up yet to figure out what's not working.
http://www3.picturepush.com/photo/a/...g/13419851.jpg

In the desert here the 1/2" poly is ~ 4 inches under ground. Other
regions may be deeper.

Pull on the poly (like pulling on a tree root out). It will lead you
to the connection point or valve box.

YMMV