Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
FREQUENCY SOURCES INC
16 MAPLE RD, CHELMSFORD, MA, 01824
Parent company: LORAL CORP
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 | Freon 113 (CFC-113) | 1,1-Dichloro-1-fluoroethane (HCFC-141b) | Total (lbs) | |||
| 1995 | — | 8,690 | 8,690 | |||
| 1991 | 12,247 | — | 12,247 | |||
| 1990 | 7,586 | — | 7,586 | |||
▎ 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.