Table 2.
Values of the exposure group determinantsa
| Determinant | Values | Definition |
|---|---|---|
| Job | 35 jobs across rigs (+ 3 broad ‘jobs’, ‘Crew’, ‘Operations’, ‘All jobs’) | Actual job titles identified in the measurement data and reported by study participants |
| Activity-taskb | • 13 vessel activities for thousands of other unnamed vessels • 6 worker water activities • 2 water tasks • 37 worker land activities • 9 land tasks |
• Vessel activities include skimming water for oil and putting out boom • Personally skimmed and personally put out boom • Cleaned oil pools • Put out boom • Maintained pumps/tanks or pumped |
| Type of vessel | • Rig • ROV • Fire control • RV • Other |
• Rig: large drilling platforms or ships • ROV: marine vessels piloting remotely operated vehicles (ROVs) • Fire control: supported flaring by rig vessels • RV: research vessels • Other: barges, crew boats, shrimpers, fishing vessels, recreational vessels, jon/draft/air boats |
| Vessel | Specified rig vessels (n = 4), specified ROVs (n = 14 + ‘All ROVs’), specified RVs (n = 33 + ‘All RVs’) | NA |
| Area of the Gulf of Mexico | • Hot zone • Hot zone/source • Offshore • Near shore |
• ≤1 nmi radius around wellhead • ≤5 nmi radius around wellhead • >5 nmi from wellhead and >3 nmi from shoreline • ≤3 nmi from shoreline |
| US state | Louisiana, Mississippi, Alabama, Florida | NA |
| Time period (TP)c | TP1a (22 April - 14 May, 2010) | Oil being released, dispersant sprayed on water, water operations slowly increasing |
| TP1b (15 May–15 July 2010) | Oil being released, dispersant sprayed on water, burning occurring, substantial water and land operations | |
| TP2 (16 July–10 August 2010) | Well sealed, dispersant and burning operations ended, other water operations decreasing somewhat, land operations still substantial | |
| TP3 (11 August–30 September 2010) | Water operations decreasing and vessels started being decontaminated and decommissioned, land operations starting to decrease | |
| TP4 (1 October–31 December 2010) | Water operations essentially over: most vessels decontaminated and decommissioned; land operation decreasing | |
| TP5 (1 January–31 March 2011) | Land operations decreasing | |
| TP6 (1 April–30 June 2011) | Land operations decreasing, warmer weather compared with TP5 |
NA, not applicable.
aSee Stenzel, Groth, Huynh et al. (2021) for more detail.
bThe difference between worker activity and worker task is not rigorous.
cThe dates associated with the time periods are not rigid with regards to the events occurring within the time period and some activities may have occurred outside the designated time periods for a relatively small number of days or by a relatively small number of people.