Official Entry: "The Recyclotorium is capable of recycling all kinds of waste product, organic or mineral. The city is an ecologically self contained area. This would not be possible without these complex recycling stations."
X-COM do not normally own recyclotoriums or have bases located beneath them, except on the Superhuman city map. This is likely an error made by the map creator.
Or you can take it as a sign of X-COM deciding to buy it out for truly dedicated recycling, what with all the
shit ...trouble they have to deal with.
- Recyclotorium One
- Recyclotorium Two