Table 2.
Number of samples collected compared to areas with expected benzene containing process streams.
| Benzene concentration range groupa | Areasb | Number of samples collectedc | Areas |
|---|---|---|---|
| A | Oil movements, reformer, tank farm, waste treatment | >500 | Catalytic cracker, coker, desulfurization, hydrofiner, laboratory, light ends unit, oil movements, pipestill, reformer, waste treatment, tank farm |
| B | Catalytic cracker, catalytic light ends unit, coker, desulfurization, gas blending, gas collection, hydrocracker, hydrofiner, isomerization, light ends unit, pipestill, solvents fractionating unit, solvents hydrogenation unit, WCLA | 100–500 | Alkylation plant, catalytic light ends unit, dewaxing area, hydrocracker, isomerization, lube blending and storage, lube extraction unit, shops, utilities |
| C | Administration, alkylation plant, asphalt plant, deasphalting unit, dewaxing area, drum storage, gas plant 3, hydrogen generation unit, lube blending and storage, lube extraction unit, lube rack, medical, MEK unit, MTBE production, propane storage, SO2 plant, utilities | <100 | Administration, analyzers, asphalt plant, cracking/reforming, deasphalting unit, distillation (lubes, oil movements, utilities), drum storage, landfill, LE rack, lube rack, medical, garage, gas collection, gas plant 3, gas blending, hydrogen generation unit, MEK unit, MTBE production, plant wide, propane storage, safety, site motorized, SO2 plant, solvent fractionating unit, solvents hydrogenation unit, store house, WCLA, wax rack |
WCLA: waste water clarification unit; MEK: methyl ethyl ketone; MTBE: methyl tertiary butyl ether; LE: light ends.
aExpected benzene concentration by area ranked from higher to lower concentration (A to C); rankings based on professional judgment of ExxonMobil Industrial Hygienists. Only areas where task samples were collected were ranked.
bAreas where concentration varies: laboratory, shops, garage, plant wide, analyzers, distillation (lubes, oil movements, utilities).
cNumber of all samples (task and non-task) collected across four facilities.