Conn. Agencies Regs. § 22a-134tt-app6
Appendix 6 to the RBCRs
Volatilization Criteria for Groundwater
| Volatile Substance | Residential Volatilization Criteria for Groundwater in µg/L (ppb) | Industrial/Commercial Volatilization Criteria for Groundwater in µg/L (ppb) |
|---|---|---|
| Acetone | 50,000 | 50000 |
| Benzene | 215 | 530 |
| Bromoform | 75 | 2,300 |
| 2-Butanone (MEK) | 50,000 | 50,000 |
| Carbon Tetrachloride | 5.3 | 14 |
| Chlorobenzene | 1,800 | 23,000 |
| Chloroform | 26 | 62 |
| 1,2-Dichlorobenzene | 5,100 | 50,000 |
| 1,3-Dichlorobenzene | 4,300 | 50,000 |
| 1,4-Dichlorobenzene | 1,400 | 3,400 |
| 1,1-Dichloroethane | 3,000 | 41,000 |
| 1,2-Dichloroethane | 6.5 | 68 |
| 1,1-Dichloroethylene | 190 | 920 |
| 1,2-Dichloropropane | 7.4 | 58 |
| 1,3-Dichloropropene | 11 | 360 |
| Ethyl benzene | 50,000 | 50,000 |
| Ethylene dibromide (EDB) | 0.30 | 11 |
| Methyl-tert-butyl-ether | 50,000 | 50,000 |
| Methyl isobutyl ketone | 13,000 | 50,000 |
| Methylene chloride | 160 | 2,200 |
| Styrene | 3,100 | 42,000 |
| Volatile Substance | Residential Volatilization Criteria for Groundwater in µg/L (ppb) | Industrial/Commercial Volatilization Criteria for Groundwater in µg/L (ppb) |
| 1,1,1,2-Tetrachloroethane | 2 | 64 |
| 1,1,2,2-Tetrachloroethane | 1.8 | 54 |
| Tetrachloroethylene | 340 | 810 |
| Toluene | 23,500 | 50,000 |
| 1,1,1-Trichloroethane | 6,500 | 16,000 |
| 1,1,2-Trichloroethane | 220 | 2,900 |
| Trichloroethylene | 27 | 67 |
| Vinyl chloride | 1.6 | 52 |
| Xylenes | 21,300 | 50,000 |
(Effective March 1, 2026)