I think it would be cool if there were locations like these.
Scrapyard:
Full of scrap metal, wrecked cars, zombie dogs
Maybe have some metalworking tools about, or a chance to get a forge, ect.
Dump:
Large area of garbage, zombies
I would see these being similar to Public Works locations outside of towns, and maybe only occupying four map tiles?
The dump is mostly just an afterthought, and I would be most interested in having scrapyards put into the game.
These could be as rare as you wanted to make them, but they would be a great place to set up a metalworking station (if they don’t already have them) and get into fabrication.
Maybe there could be a chance that they have tools?