Table 3. Drilling Scenario – Emission Source Summary

Air Emission Sources Unit

Drilling Scenario

EPN(s)

per day per year

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator bbls 425 67,600

All sources with EPN starting with SB Supply Boats bbls 415 86,320

DR-PO-01 Painting (paint + thinner) gals 34 -

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 hours 24 4,992

DR-GE-08 ROV Emergency Generator hours 1 100

DR-AC-01 Air Compressor Diesel Engine #1 hours 0.5 104

DR-AC-02 Air Compressor Diesel Engine #2 hours 0.5 104

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 hours 0.5 100

DR-FL-01 Diesel Powered Forklift Engine hours 24 4,992

DR-FR-01 Fast Rescue Craft hours 0.5 100

DR-WB-01 Water Blasting Engine hours 12 2,496

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 hours 24 4,992

DR-WO-01 Welding lbs 50 10,400

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks hours 24 4,992

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks hours 24 4,992

DR-FE-01 Drillship Fugitive Emissions hours 24 4,992

DR-VG-01 Mud Degasser Vent hours 24 4,992

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 hours 24 4,992

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 hours 24 4,992

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 hours 24 125
Table 4. Drilling Scenario – PM Emissions 

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 240.28 19.14

All sources with EPN starting with SB Supply Boats 114.65 11.92

DR-PO-01 Painting (paint + thinner) 2.54 0.13

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 4.34 0.45

DR-GE-08 ROV Emergency Generator 0.14 0.01

DR-AC-01 Air Compressor Diesel Engine #1 0.02 1.03E-03

DR-AC-02 Air Compressor Diesel Engine #2 0.02 8.58E-04

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 0.24 0.03

DR-FL-01 Diesel Powered Forklift Engine 1.58 0.17

DR-FR-01 Fast Rescue Craft 0.08 7.56E-03

DR-WB-01 Water Blasting Engine 0.82 0.09

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 4.05 0.74

DR-WO-01 Welding 1.92 0.20

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent - -

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 2.93 0.30

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 4.73 0.49

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 36.96 0.10

Total Emissions 415.29 33.77
Table 5. Drilling Scenario – PM10 Emissions 

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 137.68 10.97

All sources with EPN starting with SB Supply Boats 94.26 9.8

DR-PO-01 Painting (paint + thinner) 2.54 0.13

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 4.34 0.45

DR-GE-08 ROV Emergency Generator 0.14 0.01

DR-AC-01 Air Compressor Diesel Engine #1 0.02 1.03E-03

DR-AC-02 Air Compressor Diesel Engine #2 0.02 8.58E-04

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 0.24 0.03

DR-FL-01 Diesel Powered Forklift Engine 1.58 0.17

DR-FR-01 Fast Rescue Craft 0.08 7.56E-03

DR-WB-01 Water Blasting Engine 0.82 0.09

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 4.05 0.74

DR-WO-01 Welding 1.92 0.20

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent - -

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 2.93 0.30

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 4.73 0.49

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 36.96 0.10

Total Emissions 292.30 23.48
Table 6. Drilling Scenario – PM2.5 Emissions 

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 133.59 10.64

All sources with EPN starting with SB Supply Boats 91.46 9.51

DR-PO-01 Painting (paint + thinner) 2.54 0.13

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 4.34 0.45

DR-GE-08 ROV Emergency Generator 0.14 0.01

DR-AC-01 Air Compressor Diesel Engine #1 0.02 1.03E-03

DR-AC-02 Air Compressor Diesel Engine #2 0.02 8.58E-04

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 0.24 0.03

DR-FL-01 Diesel Powered Forklift Engine 1.58 0.17

DR-FR-01 Fast Rescue Craft 0.08 7.56E-03

DR-WB-01 Water Blasting Engine 0.82 0.09

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 4.05 0.74

DR-WO-01 Welding 1.92 0.20

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent - -

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 2.93 0.30

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 4.73 0.49

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 36.96 0.10

Total Emissions 285.41 22.86
Table 7. Drilling Scenario – NOX Emissions

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 8,670 690.83

All sources with EPN starting with SB Supply Boats 4189 435.62

DR-PO-01 Painting (paint + thinner) - -

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 143.23 14.90

DR-GE-08 ROV Emergency Generator 4.47 0.22

DR-AC-01 Air Compressor Diesel Engine #1 0.28 0.01

DR-AC-02 Air Compressor Diesel Engine #2 0.23 0.01

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 3.32 0.42

DR-FL-01 Diesel Powered Forklift Engine 22.32 2.32

DR-FR-01 Fast Rescue Craft 1.42 0.14

DR-WB-01 Water Blasting Engine 16.41 1.71

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 - -

DR-WO-01 Welding - -

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent - -

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 64.37 6.69

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 156.25 16.25

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 410.06 1.07

Total Emissions 13,682 1,170
Table 8. Drilling Scenario – SO2 Emissions 

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 3.85 0.31

All sources with EPN starting with SB Supply Boats 3.91 0.41

DR-PO-01 Painting (paint + thinner) - -

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 0.15 1.54E-02

DR-GE-08 ROV Emergency Generator 4.77E-03 2.38E-04

DR-AC-01 Air Compressor Diesel Engine #1 1.01E-04 5.25E-06

DR-AC-02 Air Compressor Diesel Engine #2 8.41E-05 4.37E-06

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 1.20E-03 1.53E-04

DR-FL-01 Diesel Powered Forklift Engine 8.08E-03 8.40E-04

DR-FR-01 Fast Rescue Craft 1.29E-03 1.29E-04

DR-WB-01 Water Blasting Engine 2.80E-02 2.91E-03

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 - -

DR-WO-01 Welding - -

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent - -

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 6.65E-02 6.92E-03

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 1.62E-01 1.68E-02

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 1.88E-01 4.91E-04

Total Emissions 8.37 0.76
Table 9. Drilling Scenario – H2SO4 Emissions 

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 1.20E-01 9.58E-03

All sources with EPN starting with SB Supply Boats 1.22E-01 1.27E-02

DR-PO-01 Painting (paint + thinner) - -

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 4.63E-03 4.81E-04

DR-GE-08 ROV Emergency Generator 1.49E-04 7.45E-06

DR-AC-01 Air Compressor Diesel Engine #1 3.15E-06 1.64E-07

DR-AC-02 Air Compressor Diesel Engine #2 2.63E-06 1.37E-07

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 3.75E-05 4.76E-06

DR-FL-01 Diesel Powered Forklift Engine 2.52E-04 2.62E-05

DR-FR-01 Fast Rescue Craft 4.03E-05 4.03E-06

DR-WB-01 Water Blasting Engine 8.75E-04 9.10E-05

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 - -

DR-WO-01 Welding - -

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent - -

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 2.08E-03 2.16E-04

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 5.05E-03 5.25E-04

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 5.89E-03 1.53E-05

Total Emissions 2.61E-01 2.37E-02
Table 10. Drilling Scenario – CO Emissions 

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 546.18 43.52

All sources with EPN starting with SB Supply Boats 2,900 301.57

DR-PO-01 Painting (paint + thinner) - -

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 75.95 7.90

DR-GE-08 ROV Emergency Generator 2.45 0.12

DR-AC-01 Air Compressor Diesel Engine #1 0.06 3.13E-03

DR-AC-02 Air Compressor Diesel Engine #2 0.05 2.61E-03

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 0.72 0.09

DR-FL-01 Diesel Powered Forklift Engine 4.81 0.5

DR-FR-01 Fast Rescue Craft 0.95 0.09

DR-WB-01 Water Blasting Engine 14.36 1.49

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 - -

DR-WO-01 Welding - -

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent - -

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 48.77 5.07

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 82.86 8.62

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 272.49 0.71

Total Emissions 3,949 369.69
Table 11. Drilling Scenario – VOC Emissions

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 196.79 15.68

All sources with EPN starting with SB Supply Boats 224.63 23.36

DR-PO-01 Painting (paint + thinner) 173.14 9.00

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 33.19 3.45

DR-GE-08 ROV Emergency Generator 1.07 0.05

DR-AC-01 Air Compressor Diesel Engine #1 0.02 1.18E-03

DR-AC-02 Air Compressor Diesel Engine #2 0.02 9.80E-04

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 0.27 3.42E-02

DR-FL-01 Diesel Powered Forklift Engine 1.81 0.19

DR-FR-01 Fast Rescue Craft 0.29 0.03

DR-WB-01 Water Blasting Engine 6.28 0.65

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 - -

DR-WO-01 Welding - -

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks 0.68 0.32

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks 0.04 0.38

DR-FE-01 Drillship Fugitive Emissions 0.13 0.02

DR-VG-01 Mud Degasser Vent 53.56 5.57

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 14.92 1.55

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 36.20 3.77

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 15.87 0.04

Total Emissions 758.90 64.10
Table 12. Drilling Scenario – Pb Emissions 

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 6.97E-02 5.55E-03

All sources with EPN starting with SB Supply Boats 7.08E-01 7.36E-03

DR-PO-01 Painting (paint + thinner) - -

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 2.68E-03 2.79E-04

DR-GE-08 ROV Emergency Generator 8.63E-05 4.31E-06

DR-AC-01 Air Compressor Diesel Engine #1 1.83E-06 9.50E-08

DR-AC-02 Air Compressor Diesel Engine #2 1.52E-06 7.92E-08

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 2.17E-05 2.17E-06

DR-FL-01 Diesel Powered Forklift Engine 1.46E-04 1.52E-05

DR-FR-01 Fast Rescue Craft 2.33E-05 2.33E-06

DR-WB-01 Water Blasting Engine 5.07E-04 5.27E-05

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 - -

DR-WO-01 Welding 8.10E-03 8.42E-04

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent - -

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 1.20E-03 1.25E-04

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 2.92E-03 3.04E-04

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 3.41E-03 8.88E-06

Total Emissions 7.97E-01 1.45E-02
Table 13. Drilling Scenario – GHG Emissions 

Air Emission Sources

Drilling Scenario

EPN(s)

lb/day tpy

DR-GE-01 through DR-GE-07 Drillship Main Engines and Emergency Generator 393,098 31,320

All sources with EPN starting with SB Supply Boats 369,247 38,402

DR-PO-01 Painting (paint + thinner) - -

DR-WL-01, DR-WL-02 Wire Line Engines no. 1 and 2 15,117 1,572

DR-GE-08 ROV Emergency Generator 486.72 24.34

DR-AC-01 Air Compressor Diesel Engine #1 10.31 0.54

DR-AC-02 Air Compressor Diesel Engine #2 8.59 0.45

DR-EC-01 through DR-EC-06 Escape Capsule Diesel Engine no. 1 to 6 122.54 12.25

DR-FL-01 Diesel Powered Forklift Engine 824.56 85.75

DR-FR-01 Fast Rescue Craft 131.7 13.17

DR-WB-01 Water Blasting Engine 2,854 297.28

DR-DC-01 through DR-DC-03 Dust Collectors no. 1 to 3 - -

DR-WO-01 Welding - -

DR-DT-01 through DR-DT-09 Nine Drill Ship Diesel Storage Tanks - -

DR-FT-01 through DR-FT-03 Three Drill Ship Jet Fuel Storage Tanks - -

DR-FE-01 Drillship Fugitive Emissions - -

DR-VG-01 Mud Degasser Vent 2,713 282.23

DR-CU-01, DR-CU-02 Drilling Casing Units 1 and 2 6,794 706.61

DR-EL-01, DR-EL-02 Electric line diesel 1 and 2 16,491 1,715

DR-VS-01 through DR-VS-05 Well Evaluation Engines No. 1 to 5 19,240 50.10

Total Emissions 827,144 74,482