Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
UNOCAL CORP
2601 E IMPERIAL HWY, BREA, CA, 92821
Parent company: UNOCAL CORP
Carcinogen
— EPA classifications across all reporting years
Top chemical totals
The 10 chemicals with the highest cumulative on-site releases in pounds (lbs) across all available years.
Full release table
Rows are years. Columns show the five highest-total chemicals across all years plus each year's total release volume.
| All values in pounds (lbs) | ||||||
|---|---|---|---|---|---|---|
| Year | Ammonia | Ammonium nitrate (solution) | Ammonium sulfate (solution) | Formaldehyde | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Total (lbs) |
| 1991 | 983,784 | 6,631 | — | — | — | 990,415 |
| 1990 | 1,170,104 | 12,065 | — | — | — | 1,182,169 |
| 1989 | 1,317,000 | 7,100 | — | 19 | — | 1,324,119 |
| 1988 | 1,216,750 | 6,967 | — | — | — | 1,223,717 |
| 1987 | 1,290,250 | 6,750 | 750 | — | 3 | 1,297,753 |
▎ Facilities report to EPA's TRI once they manufacture, process, or use a listed chemical above set thresholds. Once that threshold is crossed, they must report actual releases regardless of size — so a small number reflects genuine low-level discharge, not a data error.