From my experience, the ones Paul is talking about are allowed for “existing” restaurants/businesses. If you are a brand new installation, or you are bringing in new cooking equipment that did not exist before, they will require that the concrete be dug up and a big in ground grease trap be installed in line with your sewage. This runs into the thousands.
In one of our locations the only cooking equipment is the oven so we were not required to put anything in (existing) provided we kept to clean waste practices.