Table 1.
Number of measurements and percent censoring by rig vessel and analyte. The total number of measurements for THC, BTEX-H is 8139.
| Drilling rig vessel | N | THC | Benzene | Toluene | Ethylbenzene | Xylene | n-Hexanea | |
|---|---|---|---|---|---|---|---|---|
| % ≤ LOD | N | % ≤ LOD | ||||||
| DDII | 343 | 34.1 | 96.2 | 58.3 | 61.5 | 50.7 | 200 | 75.0 |
| DDIII | 449 | 29.8 | 94.9 | 24.5 | 36.7 | 34.1 | 287 | 45.3 |
| Enterprise | 437 | 11.0 | 87.0 | 35.5 | 58.1 | 40.7 | 275 | 21.5 |
| Q4000 | 207 | 19.8 | 92.3 | 32.9 | 63.3 | 39.1 | 197 | 67.0 |
| Total | 1436 | 23.7 | 92.4 | 37.1 | 53.0 | 40.8 | 959 | 49.1 |
THC, total petroleum hydrocarbons.
a n-Hexane samples before imputation of n-hexane samples for TP1a.