EPCRC (Energy Pipeline Cooperative Research Centre in Australia) has developed a software package called EPDECOM to calculate the decompression wave speed of carbon dioxide mixtures containing impurities. The present report summarizes findings from the evaluation of the beta version of EPDECOM. The evaluation was based on the results of testing the 43 mixture compositions of CO2 binaries and the anthropogenic CO2+impuries used in the ALT-1-2 project.