Acknowledgements

The author gratefully acknowledges the assistance and cooperation of Environment Canada regional personnel (Atlantic, Quebec, Ontario, and Pacifie and Yukon), provincial environmental personnel, and company personnel in providing information for and reviews, corrections, and comments on this report.

Thanks are also due to Mr. Lawrence Dwyer, Chemical Industries Division, for providing guidance and constructive comments; the secretarial staff for typing drafts and enduring revisions; Drafting Services for producing the illustration; and ICI Ltd., Cornwall, Ontario, for permission to use photographs of their cell room.