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U.S./Mexico Border Report for Arizona- March
Trends in Chemicals Released
In 2005, 69 facilities in the Border area of Arizona
reported releases of approximately 4.8 million pounds
of toxic chemical to the TRI Program. The following
chart tracks releases to the environment for reporting
years 2003 through 2005.
Total Releases for Reporting Years 2003 - 2005
Year
Air
Water
On-Site
Land
Under-
ground
Injection
Off-Site
2003
691.295
6.031
3.828.293
0
145.412
2004
570.389
6.204
4.131.827
0
167.523
2005
483.669
5.683
4.054.362
0
220.547
Largest Releases by Industry Type
During 2005, two industries account for 93% of the
total 4.8 million pounds of reported releases in the
Border area of Arizona. They are:
Industry
Percentage of
Total Releases
Copper Mining
80%
Electricity Generation
13%
Largest Releases by Chemical Type
The top five chemicals released in the Border area of
Arizona in 2005, ranked by total on-site and off-site
releases, are:
Chemical
Release
(pounds)
Percentage of
Total Releases
Lead Compounds
2,629,605
55%
Chromium Compounds
444,291
9%
Copper Compounds
210,193
4%
Barium Compounds
197,271
4%
Barium
146,566
3%
Page 2
Facilities Releasing Largest Quantities of Chemicals
Ten facilities, listed in descending order, released the
largest total on-site and off-site releases in the Border
area of Arizona:
1.	Phelps Dodge Sierrita Inc. (Green Valley, Pima
County) with 2.3 million pounds (70% lead
compound releases).
2.	ASARCO LLC Mission Complex (Sahuarita, Pima
County) with 1.3 million pounds (77% lead
compound releases).
3.	Arizona Electric Power Cooperative Inc (Cochise,
Cochise County) with 388 thousand pounds (51%
barium compound releases).
4.	Irvington Generating Station (Tucson, Pima
County) with 226 thousand pounds (65% barium
releases).
5.	Phelps Dodge Mining Co Copper Queen Branch
(Bisbee, Cochise County) with 200 thousand
pounds (100% copper compound releases).
6.	Learjet Inc. (Tucson, Pima County) with 55
thousand pounds (50% ethylbenzene and 50%
naphthalene releases).
7.	AACCO Cast Products Inc (Benson, Cochise
County) with 42 thousand pounds (85% copper
releases).
8.	Hart & Cooley Inc (Tucson, Pima County) with 38
thousand pounds (100% glycol ether releases).
9.	Imation Corp (Tucson, Pima County) with 24
thousand pounds (78% chromium compound
releases).
10.	U.S. Army Yuma Proving Ground (Yuma, Yuma
County) with 24 thousand pounds (49% copper and
49% nitroglycerin releases).
On-line Access
For national information on data releases, see:
http://www.epa. gov/tri
The TRI data is available through Envirofacts
Warehouse, EPA's premier internet site for distributing
environmental information at:
http://www.epa.gov/enviro
or the TRI Explorer tool:
http://www.epa.gov/triexplorer
U.S. EPA Region 9 TRI Program
Mariela Lopez (415) 972-3771
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