Found PVC while digging, what is the purpose of the pipe I hit?
My best guess is the two pvc are abandoned irrigation given the size and thickness. The black is definitely for a drip system and the wire is most likely low voltage landscape lighting. Keep in mind all any of us can do is tell you what those items were intended For by the mfg. I have seen many a product abused and misused so without testing one cannot be sure. But given the material, location, depth, and proximity odds are very high that one or more of us nailed it. Not quite as good as you did though.