Had this one yesterday. Needed to replace the entire valve and it was fed through the bottom from the main line. Plumbers years ago had also come out the back side of the valve to provided supply water to a couple of QCVs in the area. After coming out the back side with a 2" galvanized nipple they set an isolation valve for the QCVs. Had to do some creative piping and double back on the lateral side to get upstream of a tee. What made it worse was that there were a lot of roots from Coastal Redwood trees that used to be in the area but didn't survive.