Junkyard is where Walter and Jesse meet Tuco to negotiate their deal.
In the process of negotiation with Walter and Jesse, Tuco beats to death No-Doze for disagreeing with him. Gonzo is crushed by a car by trying to move the body to offer him a proper burial. ("A No-Rough-Stuff-Type Deal")
To start off season two, the previous scene is shown again. Later in the episode Hank and the DEA investigate the deaths. ("Seven Thirty-Seven")