I didn't. It's not good practice to fill in the trench with rubble (rubble is the big chunks of concrete with re-bar still in it, not the dirt). I left the dirt down there, along with any smaller chunks of concrete, anything smaller than a golf ball or so. Good practice states that you should fill the trench directly around the pipe with gravel which i brought down fresh, compact that and then fill dirt on top of that, which I had left down there, and then finally with newly poured concrete and re-bar. Filling in the trench with the rubble would potentially damage the new pipe I just put in. It actually wasn't bad bringing in the new gravel and sacks of concrete because gravity does the work for you. We just opened one of the windows and put two 2x4 boards to make a ramp and slid the bags down that. Just had to carry it from the truck to the window.