for an industrial park, I’d expect it to not be picked clean specifically because its not ‘loot’ as a survivor would see it, (no food, no water, no means of creating shelter) but specialized loot that the layman wouldn’t be aiming for.
so! for production of calcium carbide, we’d need limestone (digging?) and coke (coal can be turned into coke as well as charcoal, in theory, all you need is a coke oven, which is just a sealed brick structure to burn the fuel with no oxygen source) and an arc furnace (which already exists)
lime and coke in a blast furnace produces calcium carbide, which can then be mixed with water in the gas machine to make acetylene gas
after a bit more research i now know it was a user by the name of ‘druidniam’ on reddit who was making these changes to the system to allow for production of oxyacetylene though this was about a year ago and I don’t see his name on the contributors list of GitHub (may have a different name there though, as most people do change names between services.) he claims that there’s a recipe for the gas machine so you can place it wherever you want though I cant find it in the files… another user said that he found the gas machine in a farm area (which I’m not sure about but hey)
I’ve also learned that ‘cavers’, or people who like to explore caves, generally tend to use acetylene lamps to explore, and acetylene lamps DO exist in the game (could be dismantled or unloaded for calcium carbide?) it would make sense to find them together in a hobbyist’s basement.