Promet Environmental Group Ltd. was retained to perform an analysis of the meteorological data available from the Tar Sands area. The probabilities of occurrence of various meteorological parameters will be used as a basis for estimating the frequencies of occurrence and costs associated with Emission Control at Syncrude's Mildred Lake operation. The minisondings which were carried out at Lease C-17 in the Athabasca Tar Sands from 1974 to 1976 form the data base for this study.