Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
PROTO ENGINEERING CORP
183 COMMERCIAL ST, SUNNYVALE, CA, 94086
Parent company: NA
PBT
— 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 | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Copper compounds | Lead compounds | Nitric acid | Total (lbs) |
| 2004 | — | — | 5 | 6 | — | 11 |
| 2003 | — | — | 5 | 6 | — | 11 |
| 2002 | — | — | 5 | 1 | — | 6 |
| 2001 | — | — | 1 | 2 | — | 3 |
| 2000 | — | — | 1 | — | — | 1 |
| 1999 | — | — | 1 | — | — | 1 |
| 1998 | — | — | 2 | — | — | 2 |
| 1997 | — | — | 1 | — | — | 1 |
| 1996 | — | — | 1 | — | — | 1 |
| 1993 | 12,000 | — | — | — | — | 12,000 |
| 1992 | 8,387 | 5 | — | — | 5 | 8,397 |
| 1991 | — | 5 | — | — | — | 5 |
| 1990 | — | 5 | — | — | — | 5 |
| 1989 | — | 10 | — | — | — | 10 |
▎ 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.