Hi,
What kind of environmental monitoring do you mean? Depending on the type of business you are in the type of testing you do will change and what and how you report. I have split my factory into zones and I'm looking for at least a 98.5% pass rate in zone 1 which is the food contact zone over the period of a month (but every failed result has to be investigated and retested with follow ups and corrective actions) I have a very small food contact area though and I don't need to worry about Listeria, Salmonella, protein, allergens, species. They would all change the way I trend and monitor each zone.