| OBSP Statistical Summary for 1,1,2,2-TETRACHLOROETHANE |
| Spike Level | Range | N | Mean | Std-Dev. | Median | F_Pseudo |
| ULTRA-LOW | 0.01-0.155 | 16 | 99% | 16% | 97% | 12% |
| LOW | 0.155-0.5 | 19 | 103% | 12% | 103% | 13% |
| MEDIUM | 0.5-2.5 | 15 | 102% | 20% | 101% | 15% |
| HIGH | 2.5-10.0+ | 4 | 105% | 10% | 102% | 10% |