I am working on digesting all 13 pages of the newly proposed OSHA heat standard. A few things that jump out at me that I have not heard people discussing (yet) are as follows:
This is being issued as a single standard that applies to all industries (General, Construction, Aggriculture, Maritime) as opposed to issuing several different industry standards like they did with silica
It follows the modern OSHA trend of requiring a written exposure control plan (similar to the newer confined space and silica standards)
It (finally) discusses the use of WBGT devices to monitor heat exposure and pegs the levels back to the (very old) NIOSH document that should have been adopted as a standard decades ago (Wet Bulb Globe Temperature)
It does not include discussion or suggestions for how multi employer worksites (such as construction projects) should be handled
On that last item, this is no different than things like bathroom facilities and first aid stations. The standards require bathroom facilities at a ratio to the number of workers. Standard practice is for the General Contractor to provide those facilities on the job site rather than every trade trying to figure that out for themselves. In many cases, I think this would be the best approach to (site specific) heat monitoring, shade, and rest stations; but not always. I think it is going to nessesitate better communication and collaboration between the trades and the GC in order to come up with workable site specific safety plans that are efficient and avoid duplication of efforts while still being effective.