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Level 1 Alert lasting longer than 20 minutes or with odors
Notification Only - Flaring incident at Marathon Martinez that may be Seen by the surrounding community.
June 8, 2023, 10:56 pm

RMP - USS-Posco Industries

Pittsburg, CA

USS-Posco Industries (UPI) is located on Loveridge Road in the city of Pittsburg, CA, approximately half a mile north of Highway 4. The UPI property occupies approximately 490 acres. It is bordered by the New York Slough of the San Joaquin/Sacramento River on the north and by open space and industrial facilities in all other directions.

Most of the facility's processes involve steel production. Hydrogen is used in the various annealing processes and anhydrous ammonia is used in Selective Catalytic Reduction operations to reduce air emissions.

For additional information regarding this facility's operations and most recent audit results, please view the Audit Summary - English | Spanish.

Regulated Substances Subject to CalARP/Federal RMP/ISO:

Regulated Substances Program Level CalARP Regulated Federal RMP Regulated ISO Regulated
Anhydrous Ammonia 3 yes yes no
Hydrogen 1 yes yes no