Manufacturing and government sources:

• Magnesium Corp. of America: 57,691,060; chlorine; hydrochloric acid; 1-2-4 trimethylbenzene (Rowley, Tooele County)

• Kennecott Utah Copper Smelter: 34,495,395; copper compounds; arsenic compounds; lead compounds (Magna)

• Geneva Steel: 1,835,624; nitrate compounds; manganese compounds; zinc compounds (Vineyard, Utah County)

• Western Zirconium: 1,783,000; nitrate compounds; ammonia; chlorine (Weber County)

• Thiokol Propulsion: 1,012,229; hydrochloric acid; methyl tert-butyl ether; 1-1-1 trichloroethane (Promontory, Box Elder County)

• Pacific States Cast Iron Pipe: 172,624; barium; phenol; manganese (Provo)

• U.S. Air Force's Ogden Air Logistics Center: 172,402; methyl ethyl ketone; dichloromethane; phenol (Ogden)

• Gossner Foods: 119,748; nitrate compounds (Cache County)

• Becton Dickinson: 110,000; dichloro-fluoroethane (Sandy)

• Alliant Aerospace-Bacchus Works: 97,709; hydrochloric acid; 1-1-1 trichloroethane; nitroglycerin (West Salt Lake County — Kearns, Magna, West Valley — up against the mountain)

Mining, power plant and waste dump sources:

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• Kennecott Utah Copper Mine: 405,388,216; copper compounds; manganese compounds; zinc compounds (Copperton)

• Safety-Kleen: 15,148,128; manganese compounds; lead compounds; copper compounds (Grassy Mountain, Tooele County)

• Barrick Resources-Mercur Gold Mine: 5,233,470; arsenic compounds; nitrate compounds; copper compounds (Tooele County)

• Bonanza Power Plant: 1,910,370; barium; hydrochloric acid; vanadium (Unita County)

• Intermountain Power Plant: 1,808,400; barium compounds; chromium compounds; manganese compounds (near Delta)

• PacifiCorp Huntington Plant: 1,385,743; barium compounds; hydrogen fluoride; manganese compounds (Huntington, Emery County)

• Envirocare of Utah: 1,364,359; lead; polychlorinated biphenyls; sodium dimethyldithiocarbamate (Clive, Tooele County)

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Source: 1998 Toxic Release Inventory