Have a project, constructed on top of a former municiple landfill. Env Engineer has classified anything under building slab as Class I Div 1, due to Methane. Only reference I can find in code concerns filling stations and is concerned about flammable leaking into the ground from above... but in a former landfill, it's coming up from below?
The architect has nice infloor outlet boxes and other things that will require underslab conduits - which now I'm thinking all need to be installed per Art 501, which could be problematic - aesthetically speaking. But what about site lighting fixtures and the branch wiring to them, ground based illuminated signs or parking control equipment - all of which may exist in the project.
With old brownfield sites being "reinvented" I was wondering if anyone else has come across this situation at a landfill and what the approach was? Not sure the local AHJ has enough experience to give a good read.
The architect has nice infloor outlet boxes and other things that will require underslab conduits - which now I'm thinking all need to be installed per Art 501, which could be problematic - aesthetically speaking. But what about site lighting fixtures and the branch wiring to them, ground based illuminated signs or parking control equipment - all of which may exist in the project.
With old brownfield sites being "reinvented" I was wondering if anyone else has come across this situation at a landfill and what the approach was? Not sure the local AHJ has enough experience to give a good read.