Leaky shutoff valve that was buried 3 1/2' down, in the middle of a OLD landscape. Roots were everywhere. It wasn't all that bad once I got it dug out, 3/4" poly house line with plastic tee and a ball valve. The Ball valve was leaking. I decided to elbow it up to a more reasionable depth (12"), install the valve and elbow down to the sprinkler line that headed off to the backflow. Tommorow has a even more challenging one, I have to fix a manifold in the landscape of a fast food joint. Except that the manifold is right next to the drivethrough, so I'll have to really watch my rear.