Rationale for the Development of a List of Regulated Substances Under CEPA Section 200 and their Threshold Quantities
- Preface
- 1. Scope of the Regulations
- 2. CRAIM List of Hazardous Substances
- 3. Development of RMP and MIACC Lists
- 4. Threshold Methodologies
- 5. Threshold Calculation for Substances in CRAIM List Originating from MIACC Lists
- 6. Hydrochloric Acid
- 7. Hydrogen Fluoride
- 8. Explosive and Miscellaneous Substances Identified in the CRAIM List
- 9. Conclusion
- 10. References
- Lists of Figures and Tables
- Exhibit 1: Toxic Substances Listed in the Risk Management Program with Threshold Quantities
- Exhibit 2: Flammable Substances Listed in the Risk Management Program with Threshold Quantities
- Exhibit 3: Substances Listed in RMP that Match Criteria for Flammability and Toxicity
- Exhibit 4: Affected Distances for Commercial High Explosives Based on the Scaling Law, Assuming TNT Equivalency of One (Peak Overpressure = 0.4 – 3.0 psi)
- Exhibit 5: Threshold Calculation for Toxic Substances in CRAIM List Originating from MIACC Lists
- Appendix A: NFPA 704 Standard System for the Indentification of the Hazards of Materials for Emergency Response, 2001 Edition
- Appendix B: Technical Details for Determination of Threshold Planning Quantities Under EPA Risk Management Program
- Appendix C: Toxic Substances Ranking Factors Used to Assign Thresholds and Related Data (Listed in Order of Ranking Factor)
- Acronyms
- Acknowledgement
5. Threshold Calculation for Substances in CRAIM List Originating from MIACC Lists
The list of substances and the threshold quantities for toxic substances originating from the MIACC List were based on expert opinion.
These threshold quantities were recalculated using the methodology that the U.S. Environmental Protection Agency used for the RMP. The principle of "Equivalent Harm" was followed. The IDLH published in 1990 were used for assessing toxicity. The 1990 IDLH values were chosen to be consistent with the RMP numbers. Future updates of the threshold quantities could be formulated using appropriate toxicity levels. The detailed calculations are presented in Exhibit 5. A summary is presented in Table 9 for toxics and Table 10 for flammables. It is recommended that the MIACC threshold quantities that are currently based on expert opinion which are difficult to trace and reproduce, be replaced by the calculated thresholds using RMP methodology.
| Chemical | CRAIM Threshold Quantity Tonnes (lbs) | Recalculated Thresholds Quantities Using RMP Methodology with IDLH 1990 Criteria Tonnes (lbs) |
|---|---|---|
Notes: | ||
| 1,2-Dichloroethane1 | 50.00 (110,000) | 6.80 (15,000) |
| 2-Chloroethanol | 1.00 (2,200) | 4.50 (10,000) |
| Allyl Chloride | 0.45 (1,000) | 9.10 (20,000) |
| Carbon monoxide | 10.00 (22,000) | 6.80 (15,000) |
| Chloropicrin | 0.22 (500) | 2.27 (5,000) |
| Chlorosulphonic acid | 1.00 (2,200) | 2.27 (5,000) |
| Cyanogen bromide | 1.00 (2,200) | 4.50 (10,000) |
| Hydrobromic acid | 2.25 (5,000) | 1.13 (2,500) |
| Ketene | 0.05 (110) | 0.22 (500) |
| Mercury2 | 1.00 (2,200) | 1.00 (2,200) |
| Methacryloyloxyethyl isocyanate | 0.05 (1,000) | Essentially not in Canadian commerce |
| Methacrolein (Methacrylaldehyde) | 0.45 (110) | Essentially not in Canadian commerce |
| Methyl bromide | 1.15 (2,500) | 6.80 (15,000) |
| Methyl iodide | 3.40 (7,500) | 4.50 (10,000) |
| Methyl vinyl ketone | 0.05 (1,000) | Essentially not in Canadian commerce |
| Nitrogen dioxide | 0.11 (220) | 1.13 (2,500) |
| Osmium tetroxide | 0.05 (110) | 0.22 (500) |
| Phenol | 10.00 (22,000) | 9.10 (20,000) |
| Stibine | 0.22 (500) | 2.27 (5,000) |
| Tetraethyl lead | 1.00 (2,200) | 2.27 (5,000) |
| Thionyl Chloride | 0.11 (220) | 6.80 (15,000) |
| Trioxychlorofluoride | 2.25 (5,000) | 6.80 (15,000) |
| Chemical | CRAIM Threshold Quantity Tonnes (lbs) | Recalculated Thresholds Quantities Using RMP Methodology Tonnes (lbs) |
|---|---|---|
Notes: | ||
| 1,2-Dichloroethane1 | 50 (110,000) | |
| Benzene | 10 (22,000) | 10 (22,000)2 |
| Gasoline | 50 (110,000) | 150 (330,000)3 |
| Cyclohexane | 50 (110,000) | 550 (1,210,000) |
| Ethylbenzene | 50 (110,000) | 7 000 (15,400,000) |
| Ethylbenzene | 50 (110,000) | 7 000 (15,400,000) |
| Natural gas | 4.5 (10,000) | 4.5 (10,000)4 |
| Petroleum ether | 50 (110,000) | 50 (110,000)4 |
| Dimethyl sulphide | 10 (22,000) | 150 (330,000) |
| t-Butylamine | 10 (22,000) | 150 (330,000) |
| Toluene | 50 (110,000) | 2 500 (5,500,000) |
| Xylene | 50 (110,000) | 8 000 (17,600,000) |
- Date Modified: