ASTM standard guide for Statistical Evaluation of Atmospheric Dispersion Models. D6589
A package with materials concerning the ASTM Standard Guide for Statistical Evaluation of Atmospheric Dispersion Models, D6589-00 is available through the web site Atmospheric Transport and Diffusion Data Archive, which was established by John Irwin (formerly at the US EPA).
The package concerning the ASTM Standard includes datasets, software etc.
It is available from the page entitled Development of Model Evaluation Methods at John Irwin's web site.
The ASTM standard guide itself is available through the ASTM web site at a price of $ 44 (as of May 2010). The first page of the standard can be viewed through this link to ASTM.
Here on the Harmonisation web site you will find a page with some comments on the ASTM methodology and its relation to the Model Validation Kit.
Related links to material which is now mostly of historical interest: