Evaluates risks to human health and the environment posed by the production, use, and disposal of hexachlorocyclopentadiene (HEX). HEX is a chemical used in the production of several pesticides, including heptachlor, chlordane, aldrin, dieldrin, endrin, mirex, pentac, and endosulfan. The compound is also used as an intermediate in the manufacturing of flame retardants and dyes.