What alternative method is available for existing stacks that cannot meet AS 4323.1-1995?
It has been recognised that many existing industrial stacks have been constructed so that the location criteria in AS 4323.1-1995 cannot be met. To acknowledge this, AMSAAP specifies approved circumstances in which USEPA Method 1 can be used as an alternative method for determining a sampling plane location. In particular, USEPA Method 1 provides for sampling in a location that is sufficiently close to a flow disturbance that it would be considered non-compliant with AS 4323.1-1995. However, using USEPA Method 1 sampling at such a location is acceptable only if, it can be demonstrated that certain gas flow criteria outlined in the method can be achieved.
