PBT Emissions

Persistent bioaccumulative toxic (PBT) chemicals are a class of compounds that persist and bioaccumulate in the environment. They have the potential to result in greater exposure to humans and the environment over a longer period of time, making even smaller quantities of these chemicals of concern. In 2000 the TRI was expanded to include new PBT chemicals, and the reporting threshold was lowered for both the newly added chemicals and certain PBT chemicals already on the TRI list. The reporting criteria for most PBT chemicals was lowered to a threshold of one hundred pounds if manufactured, used, or processed. A threshold of ten pounds was established for another subset of PBT chemicals that are highly persistent and highly bioac-cumulative, including mercury compounds, pesticides such as chlordane,

COMPANIES WITH LARGEST EMISSIONS; TOTAL SURFACE WATER

DISCHARGES

Surface Water

Principal

Companies with

Discharges,

Chemical

Largest Discharges

in Pounds, 2000

Releases

AK Steel Corp., PA

28,048,653

Nitrate Compounds

BASF Corp., TX

21,515,040

Nitrate Compounds

AK Steel, IN

12,211,850

Nitrate Compounds

Vicksburg Chemical Co., MS

7,966,805

Nitrate Compounds

IBP Inc., NE

6,700,250

Nitrate Compounds

Smithfield Packing Co., NC

5,129,795

Nitrate Compounds

source: U.S. Environmental Protection Agency

COMPANIES WITH LARGEST EMISSIONS; TOTAL AIR EMISSIONS

Total Air

Principal

Companies with

Emissions,

Chemical

Largest Emissions

in Pounds, 2000

Releases

Magnesium Corp. of America, UT

43,932,001

Chlorine, Hydrochloric Acid

CP&L Roxboro Steam Electric Plant, NC

19,247,325

Hydrochloric Acid

Reliant Energies Inc., Keystone Power Plant, PA

18,460,972

Hydrochloric Acid, Sulfuric Acid

Bowen Steam Electric Plant, GA

17,807,778

Sulfuric Acid, Hydrogen Fluoride

Lenzing Fibers Corp., TN

17,345,982

Carbon Disulfide

Gulf Power Co. Crist Plant, FL

16,621,882

Hydrochloric Acid, Sulfuric Acid

source: U.S. Environmental Protection Agency

COMPANIES WITH LARGEST EMISSIONS; TOTAL LAND RELEASES

Total Releases

Principal

Companies with

to Land,

Chemical

Largest Releases

in Pounds, 2000

Releases

Kennecott Utah Copper Mine, UT

813,758,255

Copper, Zinc, Antimony

Red Dog OPS Mine Facility, AK

445,322,528

Cadmium, Lead

Barrick Goldstrike Mines Inc., NV

346,539,178

Arsenic, Manganese, Zinc

Newmont Mining Corp., Twin Creeks Mine, NV

219,922,901

Arsenic, Antimony

ASARCO Inc. Ray Complex Mine, AZ

155,098,189

Copper

Newmont Mining Corp., Carlin, NV

154,157,564

Arsenic, Zinc, Antimony

source: U.S. Environmental Protection Agency

heptachlor, methoxychlor, and toxaphene, polychlorinated biphenyls (PCBs), and polycyclic aromatic compounds (PACs). Since dioxins are highly persistent but are produced in extremely small amounts, the threshold for dioxin and dioxin-like compounds was set at 0.1 grams, with the provision that reporting include dioxin and dioxin-like compounds that are present as contaminants in a chemical or that are created during the manufacture of another chemical.

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