Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. March 2015
Revision 2 

## THIS PAGE
INTENTIONALLY
LEFT BLANKRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. i March 2015
Revision 2 TABLE OF CONTENTS

Page

ACRONYMS & ABBREVIAT IONS

................................ ................................ ................................ ........ VII

GLOSSARY OF SELECTED DRILLING TERMS

................................ ................................ .................. XI

CROSS

- REFERENCE TO APPLICA BLE REGULATIONS

................................ ................................ XIV

SECTION 1.0 REVISED EXPLORATION PLAN CONTENTS

................................ ....................... 1

- 1

a) Description, Objectives, and Schedule for the Exploration Drilling Program

............. 1

- 5

b) Location

................................ ................................ ................................ ........................ 1

- 7

c) Drilling Units

................................ ................................ ................................ .............. 1

- 16

d) Service Fee

................................ ................................ ................................ ................. 1

- 18

SECTION 2.0 GENERAL INFORMATION

................................ ................................ ....................... 2

- 1

a) Application and Permits

................................ ................................ ............................... 2

- 1

b) Drilling Fluids

................................ ................................ ................................ .............. 2

- 2

c) Chemical Products

................................ ................................ ................................ ........ 2

- 2

d) New or Unusual Technology

................................ ................................ ........................ 2

- 3

e) Bonds, Oil Spill Financial Responsibility, and Well Control Statements

.................... 2

- 3

f) Suspension of Operations

................................ ................................ ............................. 2

- 4

g) Blowout Scenario

................................ ................................ ................................ ......... 2

- 4

h) Contact Information

................................ ................................ ................................ ...... 2

- 5

SECTION 3.0 GEOLOGICAL AND GEOPH YSICAL INFORMATION ( PROPRIETARY AND CONFIDENTIAL)

................................ ................................ ................................ ....... 3

- 1

SECTION 4.0 HYDROGEN SULFIDE INF ORMATION

................................ ................................ . 4

- 1

a) Concentration

................................ ................................ ................................ ............... 4

- 1

b) Classification

................................ ................................ ................................ ................ 4

- 2

c) Conting ency Plan

................................ ................................ ................................ .......... 4

- 2

d) Modeling Report

................................ ................................ ................................ ........... 4

- 2

SECTION 5.0 BIOLOGICAL, PHYSICAL , AND SOCIOECONOMIC INFORMATION

............... 5

- 1

a) Biological Environment Reports

................................ ................................ .................. 5

- 1

b) Physical Environment Reports

................................ ................................ ..................... 5

- 4

c) Socioeconomic Study Reports

................................ ................................ ...................... 5

- 8Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. ii March 2015
Revision 2 SECTION 6.0 SOLID AND LIQUID WAS TE AND DISCHARGE INF ORMATION

..................... 6

- 1

a) Projected Generated Wastes

................................ ................................ ......................... 6

- 1

b) Ocean Discharges and Disposal Methods

................................ ................................ .... 6

- 1

c) NPDES Permits

................................ ................................ ................................ ............ 6

- 7

d) Modeling Report

................................ ................................ ................................ ........... 6

- 9

e) Cooling Water Intake

................................ ................................ ................................ . 6

- 10

SECTION 7.0 AIR EMISSIONS INFORM ATION

................................ ................................ ............ 7

- 1

a) Projected Emissions

................................ ................................ ................................ ...... 7

- 1

b) Emission Reduction Measures

................................ ................................ ..................... 7

- 3

c) Processes, Equipment, Fuels, and Combustibles

................................ .......................... 7

- 3

d) Distance to Shore

................................ ................................ ................................ .......... 7

- 4

e) Impact from Non

- Exempt Drilling Units

................................ ................................ ..... 7

- 4

f) Modeling Report

................................ ................................ ................................ ........... 7

- 5

SECTION 8.0 OIL AND HAZARDOUS SU BSTANCES SPILL INFOR MATION

......................... 8

- 1

a) Oil Spill Response Planning

................................ ................................ ......................... 8

- 1

b) Location of Primary Oil Spill Equipment Base and Staging Area

............................... 8

- 1

c) Name(s) of Spill Removal Organization(s) for Both Equipment and Personnel

.......... 8

- 2

d) Calculated Volume of Worst Case Discharge Scenario

................................ ............... 8

- 2

e) Description of Worst Case Discharge Scenario

................................ ........................... 8

- 3

f) Modeling Report

................................ ................................ ................................ ........... 8

- 3

SECTION 9.0 ALASKA OUTER CONTINE NTAL SHELF PLANNING INFORMATION

........... 9

- 1

a) Emergency Plan

................................ ................................ ................................ ............ 9

- 1

b) Critical Operations and Curtailment Plan and Drilling Ice Management Plan

............. 9

- 1

c) Additional Inform ation

................................ ................................ ................................ . 9

- 1

SECTION 10.0 ENVIRONMENTAL MONITO RING

................................ ................................ ....... 10

- 1

a) Monitoring Systems

................................ ................................ ................................ .... 10

- 1

b) Incidental Takes

................................ ................................ ................................ .......... 10

- 2

SECTION 11.0 LEASE STIPULATIONS I NFORMATION

................................ .............................. 11

- 1

Stipulation No. 1

- Protection of Biological Resources

................................ .............................. 11

- 1

Stipulation No. 2

- Orientation Program

................................ ................................ ..................... 11

- 2

Stipulation No. 3

- Transportation of Hydrocarbons

................................ ................................ .. 11

- 4

Stipulation No. 4

- Industry Site

- Specific Bowhead Whale Monitoring Program

...................... 11

- 4Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. iii March 2015
Revision 2 Stipulation No. 5

- Lease Sale 193 Conflict Avoidance Mechanisms to Protect Subsistence Whaling and Other Subsistence Harvesting Activities

................................ ............................... 11

- 9

Stipulatio n No. 6

- Pre

- Booming Requirements for Fuel Transfers

................................ ......... 11

- 14

Stipulation No. 7

- Lighting of Lease Structures to Minimize Effects t o Spectacled and
Steller’s eider

................................ ................................ ................................ ............................ 11

- 14

SECTION 12.0 ENVIRONMENTAL MITIGA TION MEASURE INFORMA TION

........................ 12

- 1

a) Permits and Authorizations

................................ ................................ ........................ 12

- 1

b) Protected Species

................................ ................................ ................................ ........ 12

- 1

c) Mit igation Measures

................................ ................................ ................................ ... 12

- 2

SECTION 13.0 SUPPORT VESSELS AND AIRCRAFT INFORMATION

................................ ...... 13

- 1

a) Planned Vessel and Aircraft List

................................ ................................ ................ 13

- 1

b) Air Emissions

................................ ................................ ................................ ........... 13

- 11

c) Drilling Fluids and Chemical Products Transportation

................................ ............ 13

- 11

d) Solid and Liquid Wastes Transportation

................................ ................................ .. 13

- 11

e) Vicinity Map and Travel Routes

................................ ................................ .............. 13

- 12

SECTION 14.0 ONSHORE SUPPORT FACI LITIES INFORMATION

................................ ............ 14

- 1

a) General

................................ ................................ ................................ ....................... 14

- 1

b) Air Emissions

................................ ................................ ................................ ............. 14

- 8

c) Unusual Solid and Liquid Wastes

................................ ................................ .............. 14

- 9

d) Waste Disposal

................................ ................................ ................................ ......... 14

- 10

SECTION 15.0 COASTAL ZONE MANAGEM ENT ACT

................................ ............................... 15

- 1

SECTION 16.0 ENVIRONMENTAL IMPACT ANALYSIS

................................ ............................. 16

- 1

SECTION 17.0 ADMINISTRATIVE

................................ ................................ ................................ .. 17

- 1

SECTION 18.0 BIBLIOGRAPHY

................................ ................................ ................................ ...... 18

- 1Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. iv March 2015
Revision 2 LIST OF TABLES

Table 1

- 1 Comparison of the Exploration Drilling Program Under Shell’s Approved EP
Revision 1 and EP Revision 2

................................ ................................ ....................... 1

- 4

Table 1.a

- 1 Shell Lease Blocks and Drill Sites Covered in the EP Revision 2 for the Exploration Drilling Program Started in 2012 (Protraction NR03

- 02, Posey Area Block)

................................ ................................ ................................ ................... 1

- 6

Table 1.c

- 1 Specifications of the Discoverer and the Polar Pioneer

................................ ............. 1

- 1 8

Table 2.a

- 1 Permit Applications Pending or Approved

................................ ................................ ... 2

- 1

Table 2.b

- 1 Drilling Fluid Type, Quantity and Discharge Rates for MLC (using bit),
Conductor and Surface

- Cased Sections

................................ ................................ ........ 2

- 2

Table 2.b

- 2 Drilling Fluid Type, Quantity and Discharge Rates for Well Sections below the Surface Casing, after the Riser is Established

................................ ............................... 2

- 2

Table 2.g

- 1 Calculated Maximum Daily Oil Flow Rates for Wells at Drill Sites

............................ 2

- 4

Table 6.b

- 1 NPDES Exploration Facilities GP Waste Streams Generated During Drilling

............. 6

- 2

Table 6.b

- 2 NPDES Exploration Facilities GP Waste Streams Generated Daily

............................. 6

- 4

Table 6.b

- 3 Wastes Generated on the Drilling Units that are not Discharged*

................................ 6

- 6

Table 6.c

- 1 Drilling Fluid Compone nts for the Upper Portions of the Well (MLC,
Conductor and Surface

- Cased Sections)

................................ ................................ ....... 6

- 7

Table 6.c

- 2 Drilling Fluid Components for the lower portions of the well after the riser and
BOP are established

................................ ................................ ................................ ...... 6

- 8

Table 6.e

- 1 Screen Mesh Size on Water Intakes on the D iscoverer

................................ .............. 6

- 10

Table 6.e

- 2 Screen Mesh Size on Water Intakes on the Polar Pioneer

................................ ......... 6

- 10

Table 7.a

- 1 3

- Year Project Duration Emissions (tons) 1

................................ ................................ .. 7

- 2

Table 7.e

- 1 Application of BOEM Exemption Formula to the Discoverer

................................ ..... 7

- 4

Table 7.e

- 2 Application of BOEM Exemption Formula to the Discoverer and Support
Vessels

................................ ................................ ................................ ........................... 7

- 4

Table 7.e

- 3 Application of BOEM Exemption Formula to the Polar Pioneer

................................ 7

- 5

Table 7.e

- 4 Application of BOEM Exemption Formula to the Polar Pioneer and Support
Vessels

................................ ................................ ................................ ........................... 7

- 5

Table 8.d

- 1 Oil Vo lume of the Worst Case Discharge Planning Scenario * for the Chukchi
Sea OSRP

................................ ................................ ................................ ...................... 8

- 2

Table 8.d

- 2 Comparison of the WCD Planning Scenario Developed for the Chukchi Sea Regional OSRP with the WCD Calculated for EP Revision 2 for Two Relief
Well Scenarios

................................ ................................ ................................ ............... 8

- 3

Table 10.a

- 1 Monitoring Equipment on the Polar Pioneer and the Discoverer

.............................. 10

- 1

Table 10.b

- 1 Number of Potential Exposures of Marine Mammals to Received Sound Levels in the Water of >120 dB re 1 μPa rms Generated by Exploration Drilling a nd >160 dB re 1 μPa rms Generated by ZVSPs during 2015 Exploration Drilling

......... 10

- 4Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. v March 2015
Revision 2 Table 11.0

- 1 Dates and Locations of Meetings Held Regarding Shell’s Chukchi Sea Exploration Drilling Program for the Development of the POC

............................... 11

- 13

Table 12.b

- 1 Species Found i n the Northeastern Chukchi Sea and Protected Under the ESA

........ 12

- 1

Table 12.b

- 2 Marine Mammals 1 Found in the Northeastern Chukchi Sea and Protected Under
the MMPA

................................ ................................ ................................ ................... 12

- 2

Table 13.a

- 1 Specifications of Support Vessel Types

................................ ................................ ...... 13

- 2

Table 13.a

- 2 Specifications of the Major Oil Spill Response Vessels

................................ ............. 13

- 3

Table 13.a

- 3 Fuel Storage Capacity and Trip Information for Support Vessels and Aircraft

........ 13

- 10

Table 13.b

- 1 Project Annual Air Pollutant Emissions (Tons Per Year) from Support Vessels Associated with the Drilling Units

................................ ................................ ............ 13

- 11

Table 13.d

- 1 Onshore Waste Disposal Facilities, Waste Type, Amount, Rate, and Disposal
Method

................................ ................................ ................................ ...................... 13

- 12

Table 14.b

- 1 Hourly Air Emissions Associated with Onshore Facilities in Barrow, Alaska

........... 14

- 8

Table 14.b

- 2 Annual Air Emissions Associated with Onshore Facilities in Barrow, Alaska

........... 14

- 8

LIST OF FIGURES

Figure 1.b

- 1 Location Map Exploration Drilling Program

................................ ................................ 1

- 8

Figure 1.b

- 2 Burger Prospect Location Map

................................ ................................ ..................... 1

- 9

Figure 1.b

- 3 Bathymetry and Planned Drilling Unit Maximum Anchor Radius

- Burger A

........... 1

- 10

Figure 1.b

- 4 Bathymetry and Planned Drilling Unit Maximum Anchor Radius

- Burger F

........... 1

- 11

Figure 1.b

- 5 Bathymetry and Planned Drilling Unit Maximum Anchor Radius

- Burger J

............ 1

- 12

Figure 1.b

- 6 Bathymetry and Planned Drilling Unit Maximum Anchor Radius

- Burger R

........... 1

- 13

Figure 1.b

- 7 Bathymetry an d Planned Drilling Unit Maximum Anchor Radius

- Burger S

........... 1

- 14

Figure 1.b

- 8 Bathymetry and Planned Drilling Unit Maximum Anchor Radius

- Burger V

........... 1

- 15

Figure 9.c

- 1 Containment System and Components

................................ ................................ .......... 9

- 4

Figure 13.e

- 1 Marine Vessel Routes

................................ ................................ ................................ 13

- 13

Figure 13.e

- 2 Flight Corridors

................................ ................................ ................................ ......... 13

- 14

Figure 14.a

- 1 Barrow Camp Locations

................................ ................................ .............................. 14

- 3

Figure 14.a

- 2 Barrow Hangar and Passenger Processing Facility

................................ ..................... 14

- 4

Figure 14.a

- 3 Barrow Proposed Passenger Processing Facility Expansion

................................ ....... 14

- 5

Figure 14.a

- 4 Barrow 75 Man Camp Location

................................ ................................ .................. 14

- 6

Figure 14.a

- 5 Wainwright Camp Location

................................ ................................ ........................ 14

- 7Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. vi March 2015
Revision 2 L IST OF APPENDICES

Appendix A Outer Continental Shelf Plan Information Forms (Form 137)

Appendix B Marine Mammal Monitoring and Mitigation Plan

Appendix C Environmental Impact Analysis

Appendix D Plan of Cooperation

Appendix E Bird Strike Avoidance and Lighting Plan Chukchi Sea, Alaska

Appendix F Critical Ope rations and Curtailment Plan

Appendix G Drilling Ice Management Plan

Appendix H Well Control Plan

Appendix I Fuel Transfer Plan

Appendix J Adaptive Approach to Ice Management in Areas Occupied by Pacific Walruses

Appendix K AQRP and NEPA Emissions Inv entor iesRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. vii March 2015
Revision 2 

## ACRONYMS & ABBREVIATIONS

ACRONYMS & ABBREVIAT IONS

~ approximately

o degree(s)

/ per 2D two

- dimensional

3D three

- dimensional

4MP Marine Mammal Monitoring and Mitigation Plan

ac acre(s)
ACMP Alaska Coastal Management Program
ACS Alaska Clean Seas

ADEC Alaska Department of Environmental Conservation

ADNR Alaska Department of Natural Resources

AES ASRC Energy Services

AEWC Alaska Eskimo Whaling Commission

APD Application for Permit to Drill

API American Petroleum Institute

APM Application for Permit to Modify AQRP Air Quality Regulatory Program

ASA Applied Science Associates, Inc.

ASRC Arctic Slope Regional Corporation
bbl barrel(s)

– 42 U.S. gallons

BOEM Bureau of Ocean Energy Management

BOP blowout preventer

BSEE Bureau of Safety and Environmental Enforcement Burger #1 well OCS

- Y

- 1413 (legacy Burger #1 well)

BWASP Bowhead Whale Aerial Survey Project

CDPF catalytic diesel particulate filters CESQG Conditionally Exempt Small Quantity Generator

CFR Code of Federal Regulations

CLO community liaison officer

cm centimeter(s)

CO carbon monoxide

COCP Critical Operations and Curtailment Plan

Com Center Communications and Call Centers cu yd cubic yard (s)

CZMA Coastal Zone Management Act
dB decibel(s)

DIMP Drilling Ice Management Plan

Discoverer M/V Noble Discoverer

DNV Det Norske Veritas

DPP development and production plan

E e ast
EA Environmental Assessment

EIA Environmental Impact Analysis

EMP Environmental Monitoring Program

ENE east

- northeast

EP Exploration PlanRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. viii March 2015
Revision 2 ACRONYMS & ABBREVIAT IONS
EP Revision 1 Chukchi Sea Exploration Plan Revision 1 (Shell 2011)
EP Revision 2 Chukchi Sea Exploration Plan Revision 2 (Shell 2015)

EPA U.S. Environmental Protection Agency

ESA Endangered Species Act

FONSI Finding of No Significant Impact

FR Federal Register
ft. foot/feet
ft 3 cubic feet

FTP Fuel Transfer Plan gal gallon(s)

GEMS Geoscience Earth & Marine Services, Inc.

GOM Gulf of Mexico

GP G eneral P ermit

H 2 S hydrogen sulfide hp horsepower
hr. hour(s)

HSWUA Hanna Shoal Walrus Use Area

HSSE Health, Safety, Security and Environment

IMO International Maritime Organization
in. inch( s)
Initial Chukchi Sea EP Shell’s initial Chukchi Sea Exploration Plan (Shell 2009)

IRA Indian Reorganization Act

KDR Kitchen/dining/recreation

KIC Kikiktagruk Inupiat Corporation kg kilogram(s)

km kilometer(s)
lb. pound(s)

LBCHU Ledyard Bay Critical Habitat Unit

m meter(s)

m 3 cubic meter(s)

mi statute mile(s)

mi 2 square miles

min minute(s)

MARPOL International Convention for the Prevention of Pollution from Ships

MAWP maximum anticipated well head pressure MD measured depth

MLC mudline cellar

mm millimeter(s)

MMPA Marine Mammal Protection Act

MMS U.S. Department of the Interior, Minerals Management Service

MODU Mobile Offshore Drilling Unit

MSW municipal solid waste

mt metric ton(s)

M/V Motor Vessel

N/A not applicable NAAQS National Ambient Air Quality Standards
NaCl sodium chloride

NAD 83 North American Datum 1983Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. ix March 2015
Revision 2 ACRONYMS & ABBREVIAT IONS

NARL Naval Arctic Research Laboratory

NE northeast

NMFS National Marine Fisheries Service

n mi nautical mile(s)

NNE north

- northeast

NOI Notice of Intent

NOx nitrogen oxide

NPDES National Pollutant Discharge Elimination System

NSB North Slope Borough

NTL Notice to Lessee

NWAB Northwest Arctic Borough

NWP Nationwide Permit

OCS Outer Continental Shelf

OSFR oil spill financial responsibility

OSR oil spill response

OSRO O il S pill Removal O rganization

OSRP O il S pill R esponse P lan

OSRV oil spill response vessel

OST oil storage tanker

OSV offshore supply vessel

OWS oil

- water separator OxyCat oxidation catalysts

PAEL Preapproved Emission Limit

PM particulate matter

PM 2.5 particulate matter less than 2.5 microns

PM 10 particulate matter less than 10 microns ppb parts per billion

ppm parts per million

PPOR potential place of refuge

POC Plan of Cooperation
Polar Pioneer Mobile Offshore Drilling Unit (MODU) Transocean Polar Pioneer

PSD Prevention of Significant Deterioration

PSO Protected Species Observer (s)

PTD proposed total depth

RKB rotary kelly bushing

rms root mean square
ROV Remotely Operated Vehicle RQ reportable quantity

RS/FO Regional Supervisor, Field Operations

SA subsistence advisor

SAPP sodium acid pyrophosphate

SAR Search and Rescue

SCR selective catalytic reduction

sec second(s)

SEPCO Shell Exploration & Production Company
Shell Shell Gulf of Mexico Inc.

SO 2 sulfur dioxide

SS subseaRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. x March 2015
Revision 2 ACRONYMS & ABBREVIAT IONS
SSV sound source verification

TA temporarily abandon

TBD to be determined

TD total depth

TDS t reatment/disposal/ storage
TSP Total Suspended Particulate

TVD true vertical depth

UIC Ukpeaġvik Iñupiat Corporation

ULSD ultra

- low sulfur diesel

UN United Nations

U.S. United States

USACE U.S. Army Corps of Engineers

USCG U.S. Coast Guard

USFWS U.S. Fish and Wildlife Service

USGS U.S. Geological Survey

UTM Universal Transverse Mercator

VOC volatile organic compound

V/V volume/volume

VHF

- AM very high frequency

– amplitude modulation

WBM water based mud

WCD Worst Case Discharge

WCP Well Control Plan

WNW west

- northwest

XC Xanthomonas campestris, also known as xanthan gum

YBP years before present

ZVSP zero

- offset vertical seismic profileRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. xi March 2015
Revision 2 

## GLOSSARY OF SELECTED DRILLING TERMS

GLOSSARY OF SELECTED DRILLING TERMS

Item Definition/Description Source

Annular Blowout
Preventer Blowout preventer that uses a shaped elastomeric sealing element to seal the space between the tubular and the wellbore or to seal an open hole. API RP 96, Deepwater Well Design and Construction, First Edition, March
2013.

Barrels (bbl) “Barrel (bbl)” means 42 U.S. gallons Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20 § 25.990, December 7, 2012.

Blind Shear Ram A closing and sealing component in a ram blowout preventer that first shears certain tubulars in the wellbore and then seals the bore, or acts as a blind
ram if there is no tubular in the wellbore. API RP 96, Deepwater Well Design and Construction, First Edition, March
2013.

Blind Ram A closing and sealing component in a ram blowout preventer that seals the open wellbore. API RP 96, Deepwater Well Design and Construction, First Edition, March
2013.

Blowout Preventer (BOP) Equipment installed on the wellhead or wellhead
assemblies to contain wellbore fluids either in the annular space between the casing and the tubulars, or in an open hole during well drilling, comp letion, and testing operations. API RP 96, Deepwater Well Design and Construction, First Edition, March
2013.

Capping Stack A set of subsea devices (included but not limited to

ram

- type BOPs) assembled to provide direct surface
intervention with the capability of capping and containing a well. Shell Wells Department

Containment System The c ontainment system is a subsea spill collection system that provides the means to intercept
uncontrolled well flows from subsea blowout situations as close to the source as possible. The containment system is housed on the Arctic Challenger barge and includes the containment dome, topside processing facilities, flare boom, an ROV, two workboats, and living qu arters. Shell Emergency Response DepartmentRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. xii March 2015
Revision 2 GLOSSARY OF SELECTED DRILLING TERMS

Item Definition/Description Source

Lower Marine Riser Package

(LMRP) The upper section of a two

- section subsea BOP stack consisting of the hydraulic connector, annular BOP, ball/flex joint, riser adapter, jumper hoses for the choke, kill and au xiliary lines and subsea control
modules. The LMRP interfaces with the lower subsea
BOP stack. API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004.

Maximum Anticipated
Surface Pressure (MASP) A design load that represents the maximum pressure that can occur at the surface during well construction or production. API RP 96, Deepwater Well Design and Construction, First Edition, March
2013.

Maximum Anticipated
Wellhead

Pressure

(MAWP) The highest pressure predicted to be encountered at the wellhead in a subsea well. The MAWP may be calculated for each hole section during well
construction. API STD 53, Blowout Prevention Equipment Systems f or Drilling Wells, Upstream Segment, Fourth Edition,
November 2012.

Mobile Offshore Drilling Unit

(MODU) Facilities designed or modified to engage in drilling and exploration activities. The term MODU includes drilling vessels, semisubmersibles, submersibles, jack

ups, and similar facilities that can be moved without substantial effort. These facilities may or may not
have self

- propulsion equipment on board and may require dynamic positioning equipment or mooring systems to maintain their position

. API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007).

Mudline Cellar

(MLC) A hole or excavation in the seafloor designed to protect the wellhead and attached BOP in areas where the seafloor is prone to scouring from ice floes (typically shallow waters in Arctic areas). The MLC (aka well cellar [30 CFR 250.451(h)]) is sufficiently deep such that the top of any wellhead equipment or a
BOP attached to the wellhead situated in the MLC is sufficiently below the mudline and out of reach for potential ice scour from ice floes. Shell Regulatory Affairs Department & 30 CFR 250.451 (h)

Pe rmanent Guidebase Structure that sets alignment and orientation relative to the wellhead system and provides entry guidance for running equipment on or into the wellhead assembly. API STD 65

– Part 2, Isolating Potential Flow Zones During Well
Construction , Upstream Segment, Second Edition, December 2010

Pipe Ram Rams whose ends are contoured to seal around pipe to close the annular space. API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. xiii March 2015
Revision 2 GLOSSARY OF SELECTED DRILLING TERMS

Item Definition/Description Source

Ram BOP BOP that uses two opposing metal elements (rams) with integral elastomer seals to contain pressure within a wellbore. Rams may be designed to close on a specific pipe size (fixed pipe rams), a range of pipe sizes (variable bore rams), or open hole (blind or blind/shear rams). API RP 96, Deepwater Well Design and Construction, First Edition, March
2013.

Riser See Lower Marine Riser Package

Rotary Kelly Bushing

(RKB) Bushing that sits on top of the rotary table. It transmits torque from the rotary table to the kelly and is commonly used as a reference for vertical
measurements from the drill

- floor. ISO 13624

- 1:2009, Petroleum and natural gas industries

– Drilling and production equipment

– Part 1: Design and operation of marine drilling riser equipment.

Semi

submersible A floating offshore drilling vessel which is ballasted at the drilling location and conducts drilling operations in a stable, partly submerged position. API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007).

Shear Ram BOP (Blind/Shear Rams) Rams having cutting blades that will shear tubulars that may be in the wellbore. Shea ring blind rams additionally close and seal against the pressure below. Casing shear rams are designed specifically to shear casing, and may not seal the well bore. API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Co ntrol Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004.

Variable Bore

Ram A pipe ram that seals on more than one pipe size. API RP 96, Deepwater Well Design and Construction, First Edition, March
2013.

Zero

- Offset
Vertical Seismic Profiling

(ZVSP) A geophysical technology for measuring the seismic properties in a profile of the earth using a set of sources and receivers, either of which are placed along the depth (vertical) axis and where the source is
near the well

- head abo ve the vertical receiver array

. Rector, J. and M. Mangriotis. 2011. Encyclopedia of Solid Earth Geophysics. Harsh K. Gupta (ed.) Department of Civil and Environmental Engineering, University of California at Berkeley, Berkeley, CA, USA. Applied Geophysics, Institute of Engineering Seismology and Earthquake Engineering (ITSAK), Thessaloniki,
Greece.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. xiv March 2015
Revision 2 

## CROSS

- REFERENCE TO APPLICA BLE REGULATIONS

Regulation Section Regulatory Information Exploration Plan ( EP )
Section

Bureau of Ocean Energy Management (BOEM)

30 Code of Federal Regulation s ( CFR ) 5 50.211 What must the EP include Section 1.0

(a) Description, objectives and schedule Section 1.0 b ) (b) Location Section 1.0 c ) (c) Drilling Unit Section 1.0 d ) (d) Service fee Section 1.0 e )
30 CFR 5 50.212 What information must accompany the EP Sectio ns 2.0

- 17.0 (a) General information required by 550 .213 Section 2.0

(b) Geological and geophysical (G&G) information required by
550 .214 Section 3.0 1

(c) Hydrogen sulfide information required by 550 .215 Section 4.0

(d) Biological, physical, and socioeconomic information required by
550 .216 Section 5.0

(e) Solid and liquid wastes and discharges information and cooling water intake information required by 550 .217 Section 6.0

(f) Air emissions information required by 550 .218 Section 7.0

(g) Oil and hazardous substance spills information required by
550 .219 Section 8.0

(h) Alaska planning information required by 550 .220 Section 9.0 (i) Environmental monitoring information required by 550 .221 Section 10.0 (j) Lease stipulations information required by 550 .222 Section 11.0 (k) Mitigation measures information required by 550 .223 Section 12.0 (l) Support vessel and aircraft information required by 550 .224 Section 13.0 (m) Onshore support facilities information required by 550 .225 Section 14.0 (n) Coastal zone management information required by 550 .226 Section 15.0 (o) Environmental impact analysis information required by 550 .227 Section 16.0 (p) Administrative information required by 550 .228 Section 17.0
30 CFR 5 50.213 General I nformation Section 2.0 (a) Applications and permits Section 2.0 a) (b) Drilling fluids Sections 2.0 b), and 6.0 (c) Chemical products Section 2.0 c) (d) New or unusual technology Section 2.0 d) (e) Bonds, oil spill financial responsibility (OSFR) , and well control

statements Section 2.0 e)

(e)(1) Activity and facility bonds (see 30 CFR 256, subpart I) Section 2.0 e) (e)(2) Oil spill financial res ponsibility for facilities ( 30 CFR 553 ) Section 2.0 e) (e)(3) Relief well financial capability and can conduct other emergency well control operations Section 2.0 e)

(f) Suspensions of operations Section s 2.0 f) and 9.0 (g) Blowout scenario Sections 2.0 g) and 8.0 e) (h) Contact Section 2.0 h)
30 CFR 5 50.214 1 G&G Information R equired by 550 .214 1 Section 3.0 1
(a) Geological description Section 3.0 a) (b) Structure contour maps Section 3.0 b ) (c) Two

- dimensional (2D) and three

- dimensional (3D) seismic lines Section 3.0 c) (d) Geological cross

- sections Section 3.0 d ) (e) Shallow hazards reports Section s 3.0 e)

, 3.0 f)Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. xv March 2015
Revision 2 

## CROSS

- REFERENCE TO APPLICA BLE REGULATIONS

Regulation Section Regulatory Information Exploration Plan ( EP )
Section

(f) Shallow hazards assessments Section 3.0 f) (g ) High resolution seismic lines Section 3.0 g) (h) Stratigraphic column Section 3.0 h) (i ) Time

- vs

- depth charts Section 3.0 i ) (j) Geochemical information Section 3.0 j) (k ) Future G&G activities Section 3.0 k )
30 CFR 5 50.215 Hydrogen S ulfide (H 2 S) I nformation Section 4.0 (a) Concentration Section 4.0 a) (b) Classification Section 4.0 b) (c) Contingency plan Section 4.0 c) (d) Modeling report Section 4.0 d) (d)(1) Site specific and area analysis not applicable ( N/A ) (d)(2) H 2 S emissions N/A
30 CFR 5 50.216 Biological, P hysical and Socioeconomic I nformation Section 5.0 (a) Biological environment reports Section 5.0 a) (b) Physical environment reports Section 5.0 b) (c) Socioeconomic study reports Section 5.0 c)
30 CFR 5 50.217 Solid and Liquid Wastes and D ischarges I nformation and Cooling Water Intake I nformation Section 6.0

(a) Projected wastes Section 6.0 a)
(a)(1) Method used to determine this information Section 6.0 a) (a)(2) Plans for treating, storing and downhole disposal of wastes Section 6.0 a) (b) Projected ocean discharges Section 6.0 b) (b)(1) Table of waste name, projected amounts, rate of discharge Section 6.0 b) (b)(2) Description of discharge method Section 6.0 a) (c) National Pollutant Disch arge Elimination System (NPDES) permit Section 6.0 c) (c)(1) Compliance discussion Section 6.0 c) (c)(2) Copy of the application Not part of this submission (d) Modeling report Section 6. 0 d) (e) Projected cooling water intake Section 6.0 e)
30 CFR 5 50.218 Air Emissions I nformation Section 7.0 (a) Projected emissions Section 7.0 a) (a)(1) For each source on the drill rig list the following: (a)(1)(i) Projected peak hourly emissions Section 7.0 a) (a)(1)(ii) Total annual emissions in tons per year Section 7.0 a) (a)(1)(iii) Emissions over the duration of the EP Section 7.0 a) (a)(1)(iv) Frequency and duration of emissions Section 7.0 a) (a)(1)(v) Total of all emissions listed in (a)(1)(i) through (iv) Section 7.0 a) (a)(2) Basis for emission calculations Section 7.0 a) (a)(3) Base projected emissions on maximum rated capacity of the equipment Section 7.0 a)

(a)(4) Specific drill unit emissions Section 7.0 a) (b) Emission reduction measures Section 7.0 a) (c) Processes, equipment, fuels, and combustibles Section 7.0 c) (d) Distance to shore Section 7.0 d) (e) Non

- exempt drilling units Section 7.0 e) (f) Modeling report Section 7.0 f)
30 CFR 5 50.219 Oil and Hazardous S ubstance Spills I nformation Section 8.0Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. xvi March 2015
Revision 2 

## CROSS

- REFERENCE TO APPLICA BLE REGULATIONS

Regulation Section Regulatory Information Exploration Plan ( EP )
Section

(a) Oil spill response planning Sec tion 8 .0 a)
(a)(1) Oil S pill R esponse P lan (OSRP) Section 8 .0 a)
(a)(2) OSRP to include: Sect ion 8 .0 a)
(a)(2)(i) Discussion of regional OSRP Section 8 .0 a) (a)(2)(ii) Location of primary oil spill equipment base and staging area Section 8 .0 b) (a)(2)(iii) Name(s) of oil spill removal organizations for both equipment and personnel Section 8 .0 c), OSRP

(a)(2)(iv) Calculated volume of the worst case discharge (WCD) S ections 2.20 g ) , 3 .0 l), 8 .0 d), e) (a)(2)(v) Description of the worst case scenario discharge Sect ion 8 .0 e) (b) Modeling report Sect ion 8 .0 f)
30 CFR 5 50.220 Alaska Planning I nformation Section 9.0 (a) Emergency plans Section 9.0 a) (b) Critical operations and curtailment procedures Section 9.0 b)
30 CFR 5 50.221 Environmental Monitoring I nformation Section 10.0 (a) Monitoring systems Section 10.0 a) (b) Incidental takes Section 10.0 b) (b)(1) Threatened and endangered species list under the Endangered Species Act ( ESA ) Section 12.0 b)

(b)(2) Marine mammals Section 12.0 b) (c) Flower Garden Banks National Marine Sanctuary N/A
30 CFR 550.222 Lease Stipulations Information Section 11.0 Stipulation No. 1 Section 11.0 Stipulation No. 2 Section 11.0 Stipulation No. 3 Section 11.0 Stipulation No. 4 Section 11.0 Stipulation No. 5 Section 11.0 Stipulation No. 6 Section 11.0 Stipulation No. 7 Section 11.0
30 CFR 550.223 Mitigation Measures Information Section 12.0 (a) Mitigation measure beyond those required by reg ulation s Section 12.0 c) (b) Mitigation measures to avoid/minimize incidental takes of: Section 12.0 c) (b)(1) Threatened and endangered species list under the ESA Section 12.0 b) (b)(2) Marine mammals Section 12.0 b)
30 CFR 550.224 Support Vessel and Aircraft Information Section 13.0 (a) General Section 13.0 a) (b) Air emissions Section 13.0 b) (c) Drilling fluids and chemical products transportation Section 13.0 c) (d) Solid and liquid wastes transportation Section 13.0 d) (e) Vicinity map Section 13.0 e)
30 CFR 550.225 Onshore Support Facilities Information Section 14.0 (a) General Section 14.0 a) (a)(1) Onshore facility existing, to be constructed or expanded Section 14.0 a) (a)(2) Onshore facilities in the western Gulf of Mexico ( GOM ) N/A (b) Air emissions Section 14.0 b) (c) Unusual solid and liquid wastes Section 14.0 c) (d) Waste disposal Section 14.0 d)
30 CFR 550.226 Coastal Z one Management Information Section 15.0, N/ARevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. xvii March 2015
Revision 2 

## CROSS

- REFERENCE TO APPLICA BLE REGULATIONS

Regulation Section Regulatory Information Exploration Plan ( EP )
Section

(a) Consistency certification N/A (b) Other information N/A
30 CFR 550.227 Environmental Impact Analysis Information Section 16.0 (a) General requirements App endix C (a)(1) Assess the potential environmental impacts App endix C (a)(2) Be project specific App endix C (a)(3) Be as detailed as necessary (b) Resources, conditions and activities App endix C (b)(1) Meteorology, oceanography, geology, and shallow hazards App endix C (b)(2) Air and water quality App endix C (b)(3) Benthic communities, marine mammals, sea turtles, coastal and marine birds, fish and shellfish, and plant life App endix C

(b)(4) Threatened and endangered species and their critical habitat App endix C (b)(5) Sensitive biological resources or habitats App endix C (b)(6) Archaeological resources App endix C (b)(7) Socioeconomic resources App endix C (b)(8) Other coastal and marine uses App endix C (b)(9) Other resources, conditions, and activities identified by the Regional Supervisor N/A

(c) Environmental impacts App endix C (c)(1) Analyze the potential direct and indirect impacts App endix C (c)(2) Analyze and potential cumulative impacts App endix C (c)(3) Describe the potential impacts and their consequences and implications App endix C

(c)(4) Describe potential mitigation measures App endix C (c)(5) Summarize information incorporated by reference App endix C (d) Consultation App endix C (e) References cited App endix C
30 CFR 550.228 Administrative Information Section 17.0 (a) Exempted information description Section 17.0 a) (b) Bibliography Section 17.0 b) (b)(1) List of all report and materials referenced Section 17.0 b) (b)(2) Location of referenced materials not submitted with EP Section 17.0 b) Notice to Lessee ( NTL )

- 2015

- N01 Blowout scenario required by 30 CFR 550.213 and 219 Section 2.0 d), and Section 8 Assumptions & calculations used to determine WCD volume Section 3.0 l), Section 8 d) United States ( U.S. ) Environmental Protection Agency (EPA)

– NPDES

40 CFR 122.21 Application for a permit Separate document
National Marine Fisheries Service (NMFS) MMPA Sections 101(a)(5) (D) Marine Mammal Protection Act Incidental Take Authorization for
Whales & Seals Separate document

U.S Fish and Wildlife Service (USFWS)
MMPA Sections 101(a)(5)(A ) and (D) Marine Mammal Protection Act Incidental and Intentional Take
Authorization s for Polar Bear & Pacific Walruses Separate document

U.S. Army Corps of Engineers (USACE)

33 CFR 325.1 Applications for permits Separate document

1 Section 3 is not included in the public version of the Chukchi Sea EP Revision 2 (See Proprietary Version)Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 1 March 2015
Revision 2 

## SECTION 1.0 REVISED EXPLORATION PLAN CONTENTS

Shell Gulf of Mexico Inc. (Shell) submitted its initial Chukchi Sea Exploration Plan (EP) ( I nitial Chukchi
Sea EP ; Shell 2009 ) to the former U.S. Department of the Interior Minerals Management Service (MMS)

,
now Bureau of Ocean Energy Management hereinafter collectively referred to as BOEM

, in May of 2009.
The initial Chukchi Sea EP was deemed submitted by BOEM o n 20 October 2009. BOEM subsequently prepared a draft Environmental Assessment (EA) wherein it analyzed the potential impacts of the

pro posed exploration drilling program, and it released that draft for public rev iew and comment. On 7 December 2009, following the close of public comment, BOEM issued a final EA and Finding of No Significant Impact (FONSI) , and approved Shell’s initial Chukc hi Sea EP

. In that initial Chukchi Sea EP,
Shell identified seven Outer Continental Shelf (OCS) lease blocks (Posey Area Blocks 6713, 6714, 6763, 6764, 6912 and Karo Area Blocks 6864 and 7007) of interest in three prospects (Burger, Crack erjack, and
South west Shoebill) that contained five potential drill sites (Burger C, F, J, Southwest Shoebill C, and Crackerjack C). The exploration drilling activities contemplated by the initial Chukchi Sea EP included
the drilling of an exploration well at up to three of the above

- referenced potential drill sites using the
drills hip Motor Vessel ( M/V ) Frontier Discoverer , which is now known as the M/V Noble Discoverer ( Discoverer ). She ll planned to initiate exploration drilling activities under the initial Chukchi Sea EP in the summer of 2010, but the exploration drilling activities were postponed when BOEM suspended all exploration drilling activities in the Arctic following the Deepwater Horizon (BP Macondo blowout)
i ncident in the Gulf of Mexico ( GOM )

. In 2011, Shell submitted to BOEM a revised EP (EP Revision 1 , Shell 2011 ) . T his revision included Shell’s plan to drill six exploration wells at only the Burger Prospect starting in 2012

. This EP was subsequently approved by the BOEM 16 December 2011. In 2012, Shell mobilized the Discoverer and its
support vessels to the Burger A drill site on the Burger Prospect. Burger A was drilled to a depth of 1,505 feet ( ft. ) and was temporarily aband oned (TA) according to the Bureau of Safety and Environmental Enforcement (BSEE) regulations at 3 0 CFR 250.1721

- 1723. In accordance with the terms and conditions of BOEM’s prior approval of EP Revision 1, Shell plans to continue exploration drilling operations at its Burger Prospect (Figures 1.b

- 1 and 1.b

- 2 )

.
This final document (EP Revision 2) includes Shell’s plans to resume drill ing operations at the currently approved drill sites located at the Burger Prospect ( Table 1.a

- 1 ). A draft version of EP Revision 2 was submi tted to BOEM on 28 August 2014 for review

. Where appropriate, Shell has addressed BOEM
review comments into the final ve rsion of EP Revision 2 and its appendices

. EP Revision 2 includes the
addition of another drilling unit, the Mobile Offshore Drilling Unit (MODU) Transocean Polar Pioneer ( Polar Pioneer ) , plus some additional support vessels. Differences between this EP Revision 2 and the approved EP Revision 1 are included in Table 1

- 1.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 2 March 2015
Revision 2 Differences b etween EP Revision 1 and EP Revision 2

The following are the most salient differences between EP Revision 1 and EP Revision 2. A larger list of changes is located in Table 1

- 1.

Addition al Drilling Unit

Under Chukchi Sea EP Revision 2, Shell plans to drill all six exploration wells using either the

Discoverer and/or the Polar Pioneer. EP Revision 2 includes simultaneous use of both drilling units
whereas in EP Revision 1 o nly the drillship Discoverer was used

. The Discoverer is ice

- strengthened for operating in Arctic OCS waters. The Discoverer includes state of the art drilling and well control equipment

. The Polar Pioneer is a non

- self

- propelled semi

- submersible drilling unit capable of drilling in harsh environments, and also includes state of the art dril ling and well control equipment

. In th e event of
a well control incident that requires drilling a relief well, e ach drilling unit will serve as its own primary relief well drilling unit and as the secondary relief well drilling unit for the other drilling unit.

Additional Support Vessels and Tr ip Frequencie s

Vessel change s between EP Revision 1 and EP Revision 2 i nclude the use of additional support vessels and oil spill response (OSR) equipment for Shell’s exploration drilling program in the Chukchi Sea (Table 1

- 1)

. These adjustm ents have been made in direct response to Shell’s experiences during the 2012

season, t he planned use of a second drilling unit, and discharge monitoring requirements under the new National Pollutant Discharge System ( NPDES ) exploration facilities g eneral p ermit ( GP )

. V essel types identified may be used to support exploration drilling activities in the Chukchi Sea (e.g., ice management, anchor handling, offshore supply, and OSR augmentation) and are therefore included in the Chukchi Sea
EP Revision 2

. The use of a ll vessel types identified is analyzed in th e Environmental Impact Analysis ( EIA ) (Appendix C). EP Revision 2 also include s the potential use of a mudline cellar (MLC) Remote ly Operated Vehicle (ROV) system housed on an offshore supply vessel (OSV)

. The MLC ROV s ystem , if permissible under applicable permits or authorizations and available, will be capable of constructing an MLC prior to the arrival of a drilling unit.

Under EP Revision 2, t he expected freque ncy of visits by OSV s to the drilling units has been increased from 17 round trips per season to 30 round trips per season.
There have also been changes in the designated locations of some support vessels and the frequency of their use, with some being moo red in Kotzebue Sound. Further information regarding the location and specifications of all vessel types proposed for use is provided in Section 13

.
Additional Aircraft and Flight Frequencie s

Under EP Revision 2

, Shell plans to utilize an additional helic opter for crew changes from Barrow to the Burger Prospect and increase the frequency of crew change flights from 12 round trips per week up to an estimated 40 round trips per week ( Table 13.a

- 3) . An additional fixed wing aircraft is provided for in EP Revision 2 as the platform for conduct ing ice reconnaissance flights. Further information regarding the location and specifications of all aircraft types proposed for use is provided in Section 13

. Exploration Drilling Changes

Under EP Revision 2, Shell will not recycle drilling fluids from one drill site to the next. Spent drilling fluids will be discharged after each well is drilled to total depth ( TD ) because of space restrictions on the drilling units and the need for multiple types of drilling fluid s

.
Also u nder EP R evision 2, d rilling fluid will not be cooled. This mitigation measure was removed as no permafrost has been observed in the five historical wells, recognized in the modern shallow hazards surveys, or encountered in the Burger A well during exploration drilling in 2012. A drilling fluid chiller will be present on both drilling unit s in the event that it is needed.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 3 March 2015
Revision 2 A third change i nvolves Shell’s blowout prevention program

. Shell will modify the blowout preventer ( BOP ) pressure test frequency from once every 7 days to once every 14 days

. This change is consistent with 30 CFR 250.447(b), which requires a BOP system test before 14 days have elapsed since the last
pressure test.

Similarities between EP R ev ision 1 and EP Revision 2

In comparison to the differences noted between EP Revision 1 and EP Revision 2, many aspects of the proposed drilling program remain similar. The following are the most salient items that have not change d
from EP Revision 1 to EP R evision 2:

• Burger Prospect drill sites

– the number (six) and locations (Table 1.a

- 1 and Figure 1.b

- 1) of drill
sites

, remain the same ;

• W orst C ase D ischarge (WCD)

– the calculated WCD flow rate s and volumes (Table 2.g

- 1) for each of the six pote ntial Burger Prospect wells remain the same ;

• Oil Spill Response Plan ( OSRP )

– although some administrative changes are noted in the
Chukchi Sea OSRP and the addition of the second drilling unit Polar Pioneer (Section 8), Shell’s response in the event of a loss of well control remains the same ;

• Well Control Plan (WCP)

– the WCP was changed to incorporate language more familiar to Shell’s well engineers and responde r s to a well control event; however, there have been no changes to the substance of Shell’s well control procedures (Appendix H) ;

• Critical Operations and Curtailment Plan (COCP)

– t he text has been updated to include the second drilling unit Polar Pioneer , key personnel titles have changed, and the curtailment decision protocol has been updated to include the new key personnel ; however, there have been no changes to the quality or substance of Shell’s COCP (Appendix F) ; and

• Drilling Ice Management Plan (DIMP)

– contains minor changes and updates ; i ce management objectives and principles are clearly defined

, the drilling units and attending ice management
vessels ha ve been updated ; however, there have been no changes to the quality or substance of
Shell’s approach to ice management (Appendix G)

. In addition to the EP changes, since EP Revision 1 was approved, several actions from the fe d eral
government may shape how Shell will operate under EP Revision 2. These actions include:

• Polar Bear Critical Habitat was vacated in January 2013 when the U

. S

. District Court for the
District of Alask a ruled that the U.S. Fish and Wildlife Service ( USFWS proposed critical habitat designation did not meet the requirements of the Endangered Species Act ( ESA ) ;

• Change in ESA status of certain ice seals

– the bearded seal (Beringia distinct population segment) and the ringed seal were listed as threatened in December 2012; in July 2014 the threatened listing for the bearded seal was vacated and remanded by the U

. S

. District Court for
the District of Alaska to NMFS ;

• Addition of the Hanna Shoal W al rus Use Area (HSWUA)

– this is a large area (approximately 9,500 square miles [ mi 2 ] ) to the northeast of the Burger Prospect that the USFWS designated as an area utilized by Pacific walrus during the summer months (Incidental Take Regulations Federal Register (FR) notice 78 FR 35364

, 12 June , 201 3) ; and

• Air em issions regulations are now administered by BOEM rather than the Environmental Protection Agency ( EPA )

. In December 2011, jurisdiction for regulating air emissions for projects on the OCS in areas off the coast of the North Slope Borough (NSB) in Alaska was changed from the EPA to BOEM ( Consolidated Appropriations Act, Page 1048 )

. As a result, theRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 4 March 2015
Revision 2 air permit for the Discoverer drill ship in the Chukchi Sea was terminated by the EPA in January
2014 ( 79 FR , Page 2442)

. Shell now seeks authorization from BOEM for air pollutants emitted during the activities described in EP Revision 2.

Table 1

- 1 Comparison of the Exploration Drilling Program Under Shell’s Approved EP Revision
1 and EP Revision 2

Parameter Approved EP Revision 1 EP Revision 2 Drilling Units Discoverer Discoverer and Polar Pioneer

MLC
Construction Discoverer Discoverer

, Polar Pioneer, MLC ROV s ystem

Support
Vessels Drilling Support Vessels :

• Ice Management vessel (x1)

• Anchor handler (x1)

• OSV s (x2)

• Shallow water landing craft (x1)

Oil Spill Response Support Vessels :

• Oil spill response vessel (OSRV) (x1)

• OSR tug (x1) and barge (x1)

• Oil storage tanker (OST) for recovered liquids (x1)

• Oil spill containment system tug (x1) and barge (x1)

• Oil spill containment system Anchor
handler (x1) Drilling Support Vessels :

• Ice Management Vessel s (x2)

• Anchor Handler s (x 3 )

• Supply Tug s (x2) and barge s ( x2 )

• OSV s (x3)

• Support Tugs ( x2 )

• Science ve ssel s (x2)

• Shallow water vessels (x2)

• MLC ROV s ystem vessel (x1)

Oil Spill Response Support Vessels :

• OSRV (x1)

• O SR tug (x1) and barge (x1)

• OST s (x2)

• Oil spill containment system tug s (x2) and barge (x1)

• OSR tug (x1) and barge for nearshore response (x1)

A ircraft • S

- 92 or AW139 for crew change

• S

- 61, S92 or EC225 for S earch and

R escue (SAR)

• Fixed wing aircraft for protected species
observer (PSO) flights

• Fixed

- wing aircraft

– crew change from Wainwright to regional jet service in

Barrow • S

- 92 Helicopter s (or similar) for crew change (x3)

• S

- 92 Helicopter (or similar) for SAR

• F ixed wing aircraft for PSO and ice monitoring flights (x2)

• Fixed

- wing

– crew change from Wainwright to regional jet service in Barrow

Aircraft Flights • Helicopter Crew Change Flights

Approximately 12 round trips/week for crew change /resupply

• Fixed wing aircraft for PSO

• Fixed wing aircraft crew change between

Barrow & Wainwright up to 4 times per
week • Helicopter Crew Change Flights

Approximately 40 ro und trips/week for crew changes/resupply

• Fixed wing aircraft for PSO and ice monitoring flights daily

• Fixed wing aircraft crew change between
Barrow and Wainwright once every 3 weeks Drilling Unit Discharges Discharges as listed in Section 6 of EP
Revision 1 Revised discharge s volumes/rates in Section 6 of
EP Revision 2 Drilling Unit
Authorizations Burger drill sites were authorized under

N ational P ollutant D ischarge E limination
S ystem (NPDES) exploration facilities
G eneral P ermit (GP) AKG

- 28

- 0000 Notices of Intent (NOI) to discharge certain wastes at the Burger drill sites w ere filed under the new
NPDES exploration facilities GP AKG

- 28

- 8100

Drilling Fluid Components List of approved components are in Table

6.c

- 1 of EP Revision 1 Additional drilling components have been added
and are in Tables 6.c

- 1 and 6.c

- 2 of EP Revisi onRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 5 March 2015
Revision 2 Table 1

- 1 Comparison of the Exploration Drilling Program Under Shell’s Approved EP Revision
1 and EP Revision 2

Parameter Approved EP Revision 1 EP Revision 2 Drilling Fluid Recycling Drilling fluids to be recycled from well to
well as practicable. Drilling fluids will not be recycled from well to
well. Drilling Fluid Cooling Drillings fluids will be cooled. Drilling fluids will not be cooled.

BOP Test Frequency Performance (pressure) test every 7 days Pressure test every 14 days as per BSEE regulation 30 CFR 250.447(b)

Shorebase Barrow

– 75 person man camp • Barrow

– lease 40 person man camp; add a kitchen unit to the 75 person man camp; add hangar sp ace for an additional helicopter

• Wainwright

– additional existing yard space has been leased for response equipment storage

Secondary
Relief Well
Unit for the

Discoverer Kulluk Polar Pioneer will serve as secondary relief well
unit for Discoverer , and Discoverer will serve as secondary relief well unit for Polar Pioneer

Air Emissions
Authorization Air emissions approved by EPA under
authorization R10OCS/PSD

- AK

- 09

- 01 Jurisdiction for regulating air emissions for projects on the OCS in areas off th e coast of the
NSB in Alaska was changed from EPA to BOEM (Consolidated Appropriations Act)

Containment System
Location Centrally located in the Chukchi Sea or
Beaufort Sea Located in or near Goodhope Bay within Kotzebue
Sound

H 2 S
Classification Requested ‘H 2 S Unknown’ classification Request s ‘H 2 S Absent’ classification ; H 2 S Contingency Plan removed

As required by 30 CFR 550 .212

- 228, details of the planned exploration drilling program are provided in the following sections and associated appendices

. While this submission is a plan revision, Shell acknowledges that pursuant to 30 CFR 5 50.285(c), the plan revision could be subject to all of the procedures under 30 CFR 550 .231 through 30 CFR 550 .235 , and has provi ded a complete EP that meets all the requirements of 30 CFR 550 .212

. This EP Revision 2 also meets the requirements of NTL 2015

- N01

.

a) Description, Objectives, and Schedule for the Exploration Drilling Program

Thi s EP Revision 2 and its appendices , including the comprehensive EIA ( Appendix C )

, describe the exploration drilling activ ities Shell plans to resume in 2015 at six lease blocks wi thin the Burger Prospect
for its exploration drilling program in the Chukchi Sea ( Figure 1.b

- 1). Each of the identified lease blocks (Fig 1.b

- 2) contain a single drill site (Table 1.a

- 1) which are described and analyzed herein. Shallow
hazards data ha s been collected at each of these drill sites and each drill site has been reviewed for potential shallow hazards and archaeological evidence. Formal shallow hazards reports and
arch a eological assessments have been submitted to the BOEM in advance of this submission under
separate cover for each of the drill sites

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 6 March 2015
Revision 2 Tab l e 1.a

- 1 Shell Lease Blocks and Drill Sites C overed in the EP Revision 2 for the Exploration Drilling Program Start ed in 2012 (Protraction NR03

- 02, Posey
Area Block )

Proposed
Drill Site Block Lease
Number Coordinates (m eters [m] ) 1

X Y Latitude Longitude

Burger A 6764 OCS

- Y

- 2280 563945.26 7912759.34 N71° 18' 30.92" W163° 12' 43.17"

Burger F 6714 OCS

- Y

- 2267 564063.30 7915956.94 N71° 20' 13.96" W163° 12' 21.75"

Burger J 6912 OCS

- Y

- 2321 555036.01 7897424.42 N71° 10' 24.03" W163° 28' 18.52"

Burger R 6812 OCS

- Y

- 2294 553365.47 7907998.91 N71° 16' 06.57" W163° 30' 39.44"

Burger S 6762 OCS

- Y

- 2278 554390.64 7914198.48 N71° 19' 25.79" W163° 28' 40.84"

Burger V 6915 OCS

- Y

- 2324 569401.40 7898124.84 N71° 10' 33.39" W163° 04' 21.23"

1 Coordinate system is North American Datum 1983 (NAD 83) UTM Zone 3

' = minute

" = second

The drilling units will move through the Bering Strait and into the Chukchi Sea on or about 1 Jul y and
then o nto the Burger Prospect as soon as ice and weather conditions allow. Exploration d rilling activities
will continue until on or about 31 October , and the drilling unit s and support vessels will exit the Chukchi
Sea at the conclusion of each exploration drilling season

. 1

Shell plans to drill exploration well s to a TD below objective depth at each of the six possible drill sites. Shell may also elect to construct additional MLC s , using the drilling units or the MLC ROV s ystem

, and upper h ole segments (i.e., “partial hole s ”) using the drilling units, depending on the available time remaining through the drilling season

. The purpose of the MLC is to ensure that the top of any portion of the wellhead and BOP is located below the maximum ice keel gouge depth , as per 30 C FR 250.451(h)

. Shallow hazards surveys (GEMS 2009; Fugro GeoConsulting, Inc. 2010a,b,c,d,e,f; Fugro GeoConsulting, Inc. 2011a,b) conducted in the area of the planned exploration drill sites in the Burger area, indicate a maximum ice keel gouge depth of about 5.0 ft. (1.5 m) below the seafloor. If the final well in a drilling

season cannot reach objective depth by the end of the drilling season, the well will be suspended in compliance with applicable BSEE regulations and with the approval of the Regio nal Supervisor

, Field Operations (RS/FO) 2

.
No unfinis hed wellbore will remain open at the end of the final drilling season except in an emergency

, but any well drilled during any season will be left at the end of any season in a status approved by the
RS/F O of BSEE

. If a hazardous condition occurs while drilling and requires curtailment of critical operations (or prevents initiating them, depending on the time available) per the provisions of the COCP (Appendix F ), the well will either be drilled to objecti ve well depth or secured and permanently abandoned prior to lease termination. Any well on which exploration drilling operations are suspended at
the end of any drilling season will be secured and permanently abandoned prior to lease termination

.

1 Shell may, depending on seasonal ice conditions

, marine mammal distributions , and planned subsistence harvest in the area of interest, request permission from the US FWS and the NMFS to transit through the Bering Strait and into the Chukchi Sea prior to 1 July

.

2 During the 2012 exploration drilling season, Shell initiated drilling at the Burger A well. The well was drilled to a

MD of 1,505 feet ( ft. ) rotary kelly bushing (RKB) and is TA according to the BSEE regulations at 30 CFR
250.1721

- 1723.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 7 March 2015
Revision 2 A well may also be started, T A due to ice, weather, or other conditions, and finished later in the same drilling season during the period covered by this EP Revision 2 . This was an operational reality during the
1989

– 1991 Chukchi Sea e xploration drilling campaign.

The actual number of wells that will be drilled in a season will depend up on ice conditions and the length
of time avai lable in each exploration drilling season. The predicted “average” drilling season, constrained by prevail ing ice conditions and regulatory restrictions, is long enough for a drilling unit to drill an exploration well from spud to proposed total depth ( P TD ) and possibly construct an additional MLC or drill and secure a partial well. Once the objective intervals ar e fully evaluated, each exploration well will be plugged and abandoned in compliance with BSEE regulation s

. Shell plans to drill six exploration wells to TD over the duration of th is EP Revision 2

. Any or a ll of these six possible drill sites may be permitted for drilling by BSEE via Applications for Permits to Drill (APD) to allow for operational flexibility in the event sea ice conditions prevent access to one or more locations.

b) Location

OCS Lease Sale 193 was held in February 2008 and Shell was subsequently awarded 275 OCS leases (blocks) through a competitive bidding process. The locations of these lease blocks in the Burger Prospect are depicted in Figure 1.b

- 1 and listed above in Table 1.a

- 1

. Locations of the six drill sites within the
blocks are depicted in Figure 1.b

- 2

. Planned drilling unit maximum anchor radii and bathymetry are
indic a ted for each drill site in Figure 1.b

- 3 through Figure 1.b

- 8. Surface and bottomhole coordinates, OCS

a

rea name and block number, lease number, distance from block line, and other information for each of the drill sites are provided on the respective OCS Plan Information Forms ( BOEM

- 0 137) attached to this EP
Revision 2 in Appendix A. Public and proprietary versions of the BOEM

- 0137 forms are part of this EP Revision 2 submission. Proprietary information withheld from the public version includes bottomhole location, true v ertical depth (TVD) and measured depth (MD)

.
Sh ell is aware that under 30 CFR 550.160 Shell must submit a request to BOEM for right

- of

- use and easement authorization if Shell wants to place one or more anchors on an adjacent lease block. Regarding the Burger S drill site ( Figure 1.b

- 7), Shell will apply for right

- of

- use and easement if any proposed anchor location would reside on an adjacent lease block

. Resupply will be from Dutch Harbor using OSV s

. Additional resupply support may be provided via
Kotzebue Sound . Aviation operations w ill be conducted primarily from Barrow

. These are the plans only for the exploration drilling program covered by this EP Revision 2

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 8 March 2015
Revision 2 Figure 1.b

- 1 Location Map Exploration Drilling ProgramRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 9 March 2015
Revision 2 Figure 1.b

- 2 Burger Prospect Location MapRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 10 March 2015
Revision 2 Figure 1.b

- 3 Bathymetry and Planned Drilling Unit Maximum Anchor Radius

- Burger ARevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 11 March 2015
Revision 2 Figure 1.b

- 4 Bathymetry and Planned Drilling U nit Maximum Anchor Radius

- Burger FRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 12 March 2015
Revision 2 Figure 1.b

- 5 Bathymetry and Planned Drilling U nit Maximum Anchor Radius

- Burger JRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 13 March 2015
Revision 2 Figure 1.b

- 6 Bathymetry and Planned Drilling U nit Maximum Anchor Radius

- Burger RRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 14 March 2015
Revision 2 Figure 1.b

- 7 Bathymetry and Planned Drilling U nit Maximum Anchor Radius

- Burger SRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 15 March 2015
Revision 2 Figure 1.b

- 8 Bathymetry and Planned Drilling U nit Maximum Anchor Radius

- Burger VRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 16 March 2015
Revision 2 c) Drilling U nit s
All planned exploration drilling in the identified lease blocks will be conducted with the Discoverer and
the Polar Pioneer

.
The Discoverer is a turret moored self

- propelled d rillship . Station keeping is accomplished using a turret

moored, 8

- point anchor system. The underwater fairleads prevent ice fouling of the anchor lines. Turret mooring allows orientation of the vessel’s bow into the prevailing metocean conditions to present minim um hull exposure to drifting ice. The vessel is rotated around the turret by hydraulic jacks. Rotation can be augmented by the use of the fitted bow and stern thrusters. Ice

- strengthened sponso n s have been
retrofitted to the drill ship’s hull.

The Discovere r is classed by Det Norske Veritas (DNV) as a MODU for worldwide service. It is a “1A1 Ship

- Shaped Drilling Unit l” and is capable of performing drilling operations offshore of Alaska. The

Discoverer has been issued with a DNV Appendix to Class stating :

“ The structural strength and material quality of the ‘Ice Belt’ formed by the sponsons below the 8,950 mm A/B level, have been reviewed against the requirements for the DNV ICE

- 05 Additional Class Notation and found to meet those requirements (as containe d in DNV Rules for Classification of Ships, Pt
5 Ch. 1, July 2006) for a design temperature of

- 15 degrees C .”

The Polar Pioneer is classed by DNV as a MODU for worldwide service. It is a non

- self

- propelled

, “SPM thruster assisted” semisubmersible offshore drilling unit of twin

- hull configuration

. The rig is a “ + A1 Column Stabilized Unit ” and is capable of performing drilling operations offshore of Alaska

. Positioning is accomplished with a combination of an eight

- point all chain catenary mooring system an d thruster assisted mooring system.

The Polar Pioneer was built in 1985, with unlimited operation area, in accordance with the Norwegian
Maritime Directorate and to DNV regulations

, current at that time. While operating in Norwegian waters,
the installati on, with its inventory, equipment, crew and machinery was required to comply with current rules and regulations for operation on t he Continental Shelf of Norway. The Polar Pioneer is generally used in waters that are at least 230 ft. (70 m) in depth. Howev er, the Polar Pioneer is able to operate in waters shallower than 230 ft. (70 m), such as those at the Burger Pro sp ect, with a completed riser analysis and mooring analysis. These analyses are proprietary documents and are submitted to BSEE as part of the Application for Permit to Drill.

Both drilling units will comply with all of the regulations of DNV, the International Maritime Organization (IMO), and the U.S. Coast Guard (USCG). All exploration drilling operations will be conducted under the provisions of 30 CFR Part 250 Subpart D, and other applicable regulations and notices including those regarding the avoidance of potential drilling hazards, safety and pollution control. The drilling units will undergo inspections by BSEE

, DNV and USCG before entering the theater.

Procedures for monitoring and reacting to ice in the prospect areas are provided in the COCP and the

D IMP which are attached as Appendices F and G , respectively

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 17 March 2015
Revision 2 Discoverer

Polar PioneerRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 1

- 1 8 March 2015
Revision 2 Table 1.c

- 1 Specifications of the Discoverer and the Polar Pioneer

Specification Discoverer Polar Pioneer

Dimensions

Hull Length 514 ft. (156.7 [m]) 279 ft. (85 m)

Hull Width 85 ft. (26.0 m) 233 ft. (71 m)

Height 274 ft. (83.2 m) 319 ft. ( 97.3 m)

Derrick Height 175 ft. (53.3 m) 170 ft. (51.8 m)

Draft

Transit Draft 26.9 ft. (8.2 m) 30 ft. (9.15 m)

Operating Draft at Load line 26.9 ft. (8.2 m) 75.4 ft. (23 m)

Berths 124 berths 114 berths

Storage Capacity

Potable Water 1,670 barrels (bbl)

(266 cubic meters [m 3 ]) 4,843 bbl (770 m 3 )

Drill Water 5,798 bbl (922 m 3 ) 11,140 bbl (1,770 m 3 )

Liquid Mud 2,400 bbl (382 m 3 ) 6,180 bbl (982 m 3 )

Bulk Cement 6,400 cubic feet (ft 3 ) (180 m 3 ) 12,678 ft 3 (359 m 3 )

Fuel 6,497 bbl (1,033 m 3 ) 11,290 bbl (1,794 m 3 )

Propulsion Engines (1) MAN Diesel B&W l

6,480 horsepower ( hp ) Not Applicable

Power Plant (6) Caterpillar 3512 1,476 hp (5) Bergen KVG

- 18 3,890 hp

Mooring

Anchors 9

– 15 metric ton (mt) Stevshark, 8 each 9

– 15 mt Stevshark, 8 each

Anchor Lines 2.75

- inch (in.) (7

- centimeters [cm]) wire
rope

2.5

- in. (6

- cm) chain 3.3 in (88 mm) K

- 4 chain

Anchor Line Length (8 each) 2,750 ft. (838 m) wire + 1,150 ft. (351 m) chain (useable) per anchor (8 each) 6,458 to 6

, 675 ft. (1 ,969 to 2,035 m) chain per anchor

Transit Speed 8.0 knots N / A (non

- self

- propelled )

Marine Sanitation Device OMNIPUR E Series 55 Piranha WRS

- 40

d) Service Fee

The r equired permit fee of $20,652 (six drill sites at $3,442 each) has been paid in full

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 2

- 1 March 2015
Revision 2 

## SECTION 2.0 GENERAL INFORMATION

a) Application and Permits

Table 2.a

- 1 lists permit and authorization applications or plans that have or will be submitted that will
support this EP Revision 2 , for the wells to be dril led i n the Burger Prospect under EP Revision 2

. S ome permits have already been obtained, and some existing permits need renewal or extension

.

T able 2.a

- 1 Permit Applications Pending or Approved

Permits &
Authorizations Agency Submittal Date Authorizat ion
Date Document
Location

Chukchi Sea E xploration

P lan Revision 2 BOEM March 2015 EP Revision 1 approved 15
December 2011 This document

APD BSEE Six (6) Burger APD applications submitted

– Jan

- Sep 2012
Dates to seek
amendments to APDs
to be determined (TBD) Burger A

– 30 August 2012 1
Burger J

– 27 September 2012 1
Burger V

– 18
October 2012 1

Amendment
authorizations TBD S eparate cover

OSRP BSEE B iennial review updates
submitted on 1 8
December 2013 Administrative updates
to be filed following
submittal of EP
Revision 2 17 February 2012 ; Biennial r eview updates a pproved
June 2014 Separate cover

NPDES GP AKG

- 28

- 8100

– Notice of Intent (NOI) EPA 23 January 2015 To be determined Separate cover

Marine Mammal
Protection Act (MMPA)
Authorization

– Whales
and Seals N MFS 18 September 2014 To be determined Separate cover

MMPA Authorization

– Incidental Take of Polar
Bear and Pacific Walrus USFWS 17 September 2014 To be determined Separate cover

MMPA Authorization

– Intentional Take of Polar
Bear and Pacific Walrus USFWS 17 September 2014 To be determined Separate cover

Section 10/404
Nationwide Permit (NWP) #8 United States Army Corps of Engineers (USACE) 30 September 2014 13 February 2015 Separate cover

Section 10 Letter of
Permission 2 USACE 30 March 2015 To be determined Separate cover

Land Use Permit

– Dutch Harbor area 2 Alaska Department
of Natural Resources (ADNR) 24 December 2014 1 March 2015 Separate cover

Land Use Permit

– Kotzebue Sound area 2 ADNR 12 February 2015 To be determined Separate coverRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 2

- 2 March 2015
Revision 2 1 BSEE approved APDs for three wells Burger A, J, and V; all only to the bottom of the 20

- in casing in each well. These three APDs, plus the APD applications for the remaining three Burger wells (Burger F, R and S) will be amended with applications to seek drilling to TD

. Dates to
seek amendment are TBD.

2 Permi ssion and permits are for activiti es outside the Lease Sale 193 Planning Area

. These approvals are not required to conduct exploration drilling activities

.

b) Drilling Fluids

Projected d rilling fluid volumes and discharge rates for each drill site are listed in Tables 2.b

- 1 and 2.b

- 2.

Further d etails regarding waste stream volumes, discharge rates, mud additives and other information can
be found in Section 6.0. Drilling fluid constituents are listed in Tables 6.c

- 1 and 6.c

- 2

.

T able 2.b

- 1 Drilling Fluid Type, Quantity and Discharge Rates for MLC (using bit)
, Conductor
and Surface

- C ased S ections

Drill Site Drilling Fluid Type Projected Drilling Fluid Quantity Projected Drilling Fluid Discharge
Rate 1

Burger A already complete already complete Burger F

Sea Water
and Gel Sweeps 3,124 bbl 29.5 bbl/ hour ( hr. ) Burger J 3,207 bbl 30.3 bbl/ hr. Burger R 3,121 bbl 29.4 bbl/ hr. Burger S 3,123 bbl 29.5 bbl/ hr. Burger V 3,207 bbl 30.3 bbl/ hr.

1 discharge occurs only during drilling; assume 106 drilling hours (does not include non

- drilling time) ; the MLC ROV s ystem if used in lieu of drilling units and as specified will not use drilling fluids

Table 2.b

- 2 Drilling Fluid Type, Quantity and Discharge Rates for W ell S ections below the
Surface C asing , after the R iser is E stablished

Drill Site Drilling Fluid Type 1 Projected Drilling Fluid Quantity 2 Projected Drilling Fluid Discharge
Rate 3
, 4

Burger A WBM 6,231 bbl 69.2 bbl/ hr. Burger F WBM 6,184 bbl 68.7 bbl/ hr. Burger J WBM 5,546 bbl 61.6 bbl/ hr. Burger R WBM 6,352 bbl 70.6 bbl/ hr. Burger S WBM 6,340 bbl 70.4 bbl/ hr. Burger V WBM 6,736 bbl 74.8 bbl/ hr.

1 WBM

– water based mud; see Section 6 for list of components

2 C utting not included in this total

3 D ischarge occurs only during drilling; assume 90 drilling hours (does not include non

- drilling time)

4 D oes not include reserve pit volumes ( Discoverer

– 1,500 bbl and Polar Pioneer

– 2,427 bbl) discharged at the end of the well at a rate not exceeding 1000 bbl/ hr.

In add ition to the WBM constituents l isted in Section 6, potassium chloride (shale inhibitor) may be used but not discharged to the ocean . Th is product may be part of the drilling fluid that will be pumped in the hole prior to cementing. This fluid will remain in the hole behind the casin g

.

c) Chemical Products

Ethylene glycol and caustic soda (sodium hydroxide) quantities are likely to exceed the reportable quantity (RQ) as defined under 40 CFR 302. However, in order for these chemicals to be discharged to the sea, they will meet the toxicit y requirements specified in the NPDES permit.

Ethylene glycol (RQ is 5,000 pounds ( lb. ) or 2,273 kilograms [ kg ] ) is an antifreeze agent that will be used
in the BOP fluid and will be discharged to the seafloor in compliance with NPDES exploration facilitiesRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 2

- 3 March 2015
Revision 2 GP AKG

- 28

- 8100. Caustic soda (RQ is 1,000 lb. or 455 kg) may be used in the drilling fluid as pH control and will also be discharged to the seafloor in compliance with NPDES exploration facilities GP
AKG

- 28

- 8100. Chemical products o n the drilling vessels will be stored in United Nations ( UN ) Specification Packaging. Materials Safety Data Sheets, or Safety Data Sheets for drilling fluid chemical
will be available on the drilling units and they will be available on the support vessels used to transport
the chemicals.

d) New or Unusual Technology

Shell is proposing to potentially use a MLC ROV s ystem when able

, under applicable permits or authorizations, and available in addition to the current MLC bit system

, to excavate new MLC s

.
The subs ea (SS) MLC ROV s ystem will be deployed by a dedicated OSV and will sit on the sea floor and

may use a number of different implements to m obilize the seafloor sediments. These sediments will then be pumped away via use of a pump mounted on the MLC ROV s ystem and discharged on the seafloor away from the excavation site. The implements used could include an excavator bucket, a rotating cutter, auger, drill, and/or rock hammer. The MLC ROV s ystem will require a slope, currently estimated at 15 o

, to maintain its stability while excavating the MLC

. Examples of MLC ROV Systems

Th e MLC ROV s ystem vehicle w ould be deployed from a vessel rather than a drilling unit

. The MLC
ROV s ystem w ould not require any pumping from the surface into the sea, which greatly decreases the discharge of foreign fluids into the water column. Because the geometry of the MLC excav ated using the
MLC ROV s ystem w ould be different than a MLC excavated using a ML C bit system deployed from a drilling unit , any well using this new technology w ould correspondingly yield a larger volume of cuttings deposited on the seafloor ( Table 6.b

- 1)

. The increased volume of the MLC afforded by the MLC ROV

s ystem w ould eliminat e the need for a remote SS control panel for well control and allow for SS pumps to be used to clear sediment from the MLC without the utilization of cutting tools.

This specific technology has not been put to use for construction of MLCs, but sim ilar technology has been used for very similar work elsewhere. The technology being proposed is commonly used for the trenching of SS pipelines and cable runs.

e) Bonds, Oil Spill Financial Responsibility, and Well Control Statements

BOEM has determined that Shell has the fin ancial capacity to allow BOEM to waive supplemental bond requirements of Shell (Operator No. YK02117). Shell also has an area wide e xploration bond for $1,000,000 with Federal Insurance Company, Bond #8216

- 14

- 86.

Shell is of sound finan cial strength and reliability and has demonstrated oil spill financial responsibility ( OSFR ) according to 30 CFR 553 for the facilities planned in the EP Revision 2. In accordance with 30 CFR 553.30(d), Shell is indemnified for $150,000,000. This financial reliability ensures that Shell has the capability to deal with all emergency situations such as blowout control including relief well drilling and kill operations, i f such an unlikely event should occur. This OSFR is current and valid and is renewed yearly when Shell submits audited financial information to BOEM.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 2

- 4 March 2015
Revision 2 This is a planned exploration drilling program with temporary seasonal operations. Drilling unit anchoring systems employed during operations will be removed upon permanent abandonment of each
well. Permanent facilities will be limited to the casing , wellhead housings and the permanent guide base remaining after well abandonment

. MLC excavations to protect the wellhead, casing and BOPs fr om potential ice gouge events will remain. Any well on which exploration drilling is suspended is secured in compliance with BSEE regulations and with the approval of the RS/FO, whether it is permanently abandoned (30 CFR 250.1710 through 1717) or TA (30 CFR 250.1721

- 1723).

f) Sus pens ion of Operations

Shell has plans and mitigation measures in place that accommodate the forced or voluntary suspension of operations during implementation of the proposed exploration drilling program detailed in EP Revision 2

. These plans and mitiga tion measures are in reference to suspension of operations as cited under 30 CFR 550.213(f) and not to be confused with suspension of operations as cited under BSEE regulations at 30 CFR 250.168 through 177. Forced suspension of operations could result fro m weather, ice conditions, drilling unit mechanical conditions, or downhole conditions, among others. In order to facilitate a possible suspension of operations, Shell has drafted several operation al plans containing suspension procedures and protocols in accordance with 30 CFR 550 .220, including a COCP , which is discussed in Section 9 .0
and attached as Appendix F

.

g) Blowout Scenario

A blowout scenario was developed for Shell’s approved Chukchi Sea Regional OSRP based on 30 CFR 254.47(b)

. The blowout scenario i s described in Section 8.0 (d) and (e) of this EP Revision 2 as required by 30 CFR 550 .219

. This blowout scenario is the same scenario as described in EP Revision 1. The approved OSRP has been prepared to accommodate this same blowout scenario

, the change of a second drilling unit (the Kulluk will not be drilling in the Beaufort Sea but the Polar Pioneer will be drilling near
the Discoverer on the Burger Prospect), the change in name of an OSR contractor, and other administrative change s

. Calculation of a WCD is also required by 30 CFR 550 .213(g) and NTL 2015

- N01 , and is discussed below and in Section 8

.

WCD

– Maximum Flow Rate, Duration and Total Volume

Shell calculated WCD flow rates and volumes for a well at each of the drill sites identified in the EP
Revision 1 using a combination of nodal analysis and numerical simulation techniques. Burger J was
found to have the calculated maximum flow rate (Table 2.g

- 1). As stated previously, the WCD
calculations remain the same in EP Revision 2. The total volume from a WCD from Burger J was calculated for both 34 days (603,56 4 bbl) and 38 days (669,479 bbl)

. These volumes were calculated from
an initial flow rate of 23,100 bbl/day which diminishes over time.

Table 2.g

- 1 Calculated Maximum Daily Oil Flow R ates for Wells at Drill Sites

Drill Site Lease Estimated WCD Maximum Daily Oil Flow rate (bbl/day) Burger J OCS

- Y

- 2321 23,100 Burger S OCS

- Y

- 2278 19,127 Burger A OCS

- Y

- 2280 19,031 Burger V OCS

- Y

- 2324 13,812 Burger F OCS

- Y

- 2267 11,763 Burger R OCS

- Y

- 2294 8,689

The assumptions and basis for calculation of the WCD are provided in Section 3.0 of the Proprietary
version of EP Revision 2 . The OSRP blowout planning scenario used for OSR planning (25,000 bbl/day for 30 days

– 750,000 bbl) exceeds the WCD calculated for Burger J, as further discussed in Section 8.0

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 2

- 5 March 2015
Revision 2 Potential for Well Bridging

F or calculation of the WCD, Shell has assumed uncontrolled flow to the mudline with no drill pipe in the hole, and no formation bridging. There has been only one penetration of the reservoir and it produced
insufficient petrophysical data to be considered s ufficient for determining bridging tendency at other sites.

Surface Intervention

Well control is discussed in Section 9.0 of this document and a WCP is provided in Appendix H

. Shell will have a capping stack and a separate containment system tug s and ba rge available for the exploration drilling program. Surface intervention and capping and containment are discus sed specifically in Section
9.0

. The capping stack system will be carried as equipment on an ice management vessel so will remain in the vicinity of the drilling units, and the containment system tug s and barge will be located in Kotzebue
Sound where it can respond if required.

Relief Well Drilling Unit

– Availability, Constraints, and Days to Drill and Kill Flow

Sh ell’s WCP is attached as Appendix H . Well control is the process of maintaining positive hydrostatic pressure in the drilled wellbore greater than that in any drilled formation, a process called positive pressure drilling, that prevents gas or fluids from underground reservoirs escaping from the wellbore in an
uncontrolled manner.

In the unlikely event of a well blowout, the primary drilling unit will serve as its own relief well drilling
unit

. If the primary drilling unit is undamaged and capable of drilling its own relief well, drilling operations could begin in as little as three days, with the relief well drilled and flow from the blowout being killed in about 31 days (the estimated total durat ion after mooring of the relief well drilling unit to well kill would be approximately 28 days for a blowout at a Burger site ) . If the primary drilling unit cannot be used to drill the relief well, the second ary drilling unit would be brought in for that purpose.
The Polar Pioneer will serve as the secondary relief well drilling unit for the Discoverer , and the

Discoverer will serve as the secondary relief well drilling unit for the Polar Pioneer

. EP Revision 2

a ssumes that both drilling units will be drilling at the Burger Prospect, in which case the estimated duration of flow prior to drilling a relief well to intersection with the original wellbore and killing the flow is approximately 34 days ( six days to mobi lize and moor and 28 days to kill the well ) . Should one drilling unit be as far away as Dutch Harbor, an additional four days will be required for the relief well, bringing total duration of uncontrolled flow to 38 days (10 days to mobilize and moor and 28 days to kill the well)

.

h) Contact Information

Contact Susan Childs, Alaska Venture Support Integrator

, Manager at telephone number ( 907 ) 646

- 7112

or via e

- mail at Susan.Childs@Shell.com

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 3

- 1 March 2015
Revision 2 

## SECTION 3.0 GEOLOGICAL AND GEOPH YSICAL
INFORMATION (PROPRIETARY AND CONFIDENTIAL)Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 4

- 1 March 2015
Revision 2 

## SECTION 4.0 HYDROGEN SULFIDE INFORMATION

a) Concentration

During the historic 1989

– 1991 Chukchi exploration drilling program, no hydrogen sulfide ( H 2 S ) was recorded while drilling in open

- hole conditions in any of the five wells: OCS

- Y 1482 Klondike #1, OCS

Y 1275 #1 (Popcorn), OCS

- Y 1413 #1 ( legacy Burger #1 well ), OCS

- Y 1320 #1 (Crackerjack) and
Chevron OCS

- Y 0996 #1 (Diamond). However, two occurrences of minor amounts of H 2 S, related to the bacterial digestion of the XC ( Xanthomonas campestris , also known as xanthan gum ) polymer in the mud that was left inside the casing during an extended period of operational suspension, were recorded and are
described below. In early October 1989, a string of 13 3⁄8

- in. (340 mm) casing was set and cemented at 5,516 ft. (1,681 m) in the le gacy Burger #1 well. The cement was displaced by the same XC polymer

based drilling mud as that used to drill the 17 1⁄2

- in. ( 445 mm ) hole below 20

- in. (508 mm) casing set at 1,440 ft. (439 m). The cement was displaced to the float collar some 43 ft . (13 m) above the casing shoe leaving a cement plug in the bottom of the casing along with two check valves (i.e., floats). The cement plugs and floats, along with the hydrostatic pressure from the mud column within the 20

- in. (508 mm) casing, prevented formation f luids from entering the casing. The well was TA with a corrosion cap set on top of the wellhead after pressure testing the wellhead hanger. The well remained in this configuration
until it was re

- entered.

In August 1990, th e MLC was cleaned out on the legacy Burger #1 well and the corrosion cap was
removed. Then a 121⁄4

- in. ( 311 mm ) bit was run through the old mud to the top of the cement plug inside the casing. The old mud was then displaced out of the 20

- in. (508 mm) ca sing with newly mixed drilling mud. When the bottom portion of the old mud reached the surface, a maximum H 2 S concentration of 30 parts per million ( ppm ) was detected at the shale shaker. As the new mud circulated to surface, the H 2 S
concentration returned to zero. Once the H 2 S concentration returned to zero the 121⁄4

- in. ( 311 mm ) bit then drilled through the cement plug and both check valves. It then proceeded to drill new formation on its way to the main objective target.

It is concluded that the H 2 S was the byproduct of bacterial digestion of the polymer in the old mud
contained within the 20

- in. (508 mm) casing. There had been no H 2 S detected while drilling the 17 1⁄2

- in. (445 mm) hole and the casing was sealed during the 10

- month time between deposit ing the mud inside the casing and circulating it out. No other H 2 S was recorded while drilling the remaining hole segments to the well’s final TD of 8,202 ft. (2,500 m).

In October 1990, the 13 3⁄8

- in. (340 mm) surface casing was set and cemented in the OCS

- Y 1320 #1 (Crackerjack) well at 5,448 ft. (1,661 m) in a 17 1⁄2

- in. (445 mm) hole below the 20

- in. (508 mm) casing set at 1,326 ft. (404 m). On this casing string, two joints of casing separated the float collar at 5,363 ft. (1,635 m) from the float shoe at 5,448 ft. (1,661 m), leaving at least 85 ft. (26 m) of cement inside the base of the pipe. Again, the cement was displaced with the same XC polymer mud used to drill the 17 1⁄2

- in. (445 mm) hole. The combination of the cement plug and the floats along with the hydrostatic pressure
from the mud column within the 133⁄8

- in. (340 mm) casing, prevented formation fluids from entering the casing. In addition, an H 2 S scavenger, Sulf

- X ES at a concentration of 1.0 parts per billion (ppb) was added to the mud to preven t bacterial degradation of the mud (as seen at the legacy Burger #1 well). The Crackerjack well was TA , without drilling out cement inside the surface casing, using a corrosion cap.

In late July 1991, the rig returned to the OCS

- Y 1320 #1 (Crackerjack) well and re

- entered the TA well

. A 121⁄4

- in. ( 311 mm ) bit was run to the top of cement inside the 133⁄8

- in. (340 mm) casing and the old mud
was circulated out of the hole. The returned mud was monitored for H 2 S by a safety specialist and by mud loggers. When mud from approximately 4,000 ft. (1,219 m) in the well reached the surface, H 2 S in trace
concentrations was released at the shakers. As the old mud was displaced with new mud, the H 2 S
concentration fell to zero prior to drilling out the cement plug and floats, and into new formation. NoRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 4

- 2 March 2015
Revision 2 other H 2 S was recorded while drilling the remaining hole segments to the well’s final TD of 9,573 ft. (2,918 m).

Again , it is concluded that the H 2 S in this well was the prod uct of bacterial digestion of the XC polymer
in the old mud. There was no H 2 S encountered while drilling the 17 1⁄2

- in. (445 mm) hole and none was released into the mud during subsequent drilling. Apparently, the H 2 S scavenger was not completely
successful in preventing the H 2 S, but the concentration was reduced from that seen in the Burger well
after about the same on

- bottom time.

No H 2 S was detected or released while drilling any of the other wells in the Chukchi Sea during the 1989

- 1991 campaign. This r einforces the conclusion that the source of H 2 S detected in these two wells was indeed the result of bacterial degradation of the polymer mud left in each hole for approximately 10 months each and not from any geologic formation penetrated by either well.

In 2012, H 2 S scavenger and corrosive inhibitor were not used in the drilling fluid . In the event of re

entering a well that was started in 2012 , that was TA the following procedure will be used. Once the drilling unit is moored, the drill pipe will be run into the surface plug and drill it out. Once the surface plug is drilled out, continue to trip in the hole to the surface casing shoe track and tag the top of cement.
The drilling unit will pick up off bottom and circulate the well to the sea floor. This will ensure that if there is any H 2 S build up it is circulated to the seafloor rather than the drilling unit topsides. Once the well has been circulated, the drilling unit will pull the drill pipe out of the hole and commence running the
BOPs and riser.

b) Classification

H 2 S is not expected in any hole segment in any exploration well pla nned in Shell’s EP Revision 2. This is
based on the absence of H 2 S in any previously drilled exploration well in the Chukchi Sea, the Beaufort Sea or the Canadian Beaufort Sea, and the fact that no H 2 S was encountered while drill ing the legacy Burger #1 well. The legacy Burger #1 well was drilled through the targeted Cretaceous objective at a TD in the Jurassic Kingak For mation at 8,202 ft. (2,500 m). All of the planned exploration wells described in this EP Revision 2 will be targeting the same Cretaceous objective interval, as encountered in the legacy Burger #1 well, and would reach TD above the Kingak Formation.

All of the Bu rger Prospect drill sites covered by Shell’s EP Revision 2 are requested to be classified as
“H 2 S absent” from the BSEE Regional Supervisor because none of the wells is projected to be drilled below the equivalent stratigraphic interval penetrated by the d epth of the legacy Burger #1 well , 8,202 ft. (2,500 m).

c) Contingency Plan

Shell is requesting “H 2 S Absent” classification from the BSEE Regional Supervisor in this EP Revision 2; therefore a contingency plan is no longer included

.

d) Modeling Report

All of the Burger Prospect drill sites covered by Shell’s EP Revision 2 are requested to be classified as
“H 2 S absent” ; therefore a modeling report has not been developed.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 1 March 2015
Revision 2 

## SECTION 5.0 BIOLOGICAL, PHYSICAL , AND
SOCIOECONOMIC INFORM ATION

a) Biological Environment Reports

Results of the shallow hazard s surveys indicate that the seafloor at all six drill sites is relatively level and smooth with the exception of ice gouges. Seafloor sediments consist largely of silts and clays. No evidence was observed of hard bottom or other special habitats.

Shell pa rtially funded other types of baseline studies since 200 8 as part of a multi

- faceted study to gather data regarding resources in the project area, and plans to continue these studies. The stud ies ’ focus
includes a 3 0 x 30 nautical mile (n mi ) study area (56 x 56 km) encompassing Shell’s Burger Prospect. The data collected during the course of these programs were used in the EIA (Appendix C )

. Final reports are currently available for the following studies :

• Benthic ecology of the Burger and Klo ndike survey areas: 2008 environmental studies program in the northeastern Chukchi Sea (Blanchard et al. 2010a)

.

• Benthic ecology of the Burger and Klondike survey areas: 2009 environmental studies program in the northeastern Chukchi Sea (Blanchard et al. 2 010b)

.

• Oceanographic assessment of the planktonic communities in the Klondike and Burger survey areas of the Chukchi Sea: report for survey year 2008 (Hopcroft et al. 2009)

.

• Oceanographic assessment of the planktonic communities in the Klondike and Burger survey areas of the Chukchi Sea: report for survey year 2009 (Hopcroft et al. 2010)

.

• Oceanographic assessment of the planktonic communities in the northeastern Chukchi Sea: report for survey year 2010 (Hopcroft et al. 2011).

• Oceanographic assessment of the planktonic communities in northeastern Chukchi Sea: report for survey year 2011 (Hopcroft et al. 2012).

• Oceanographic assessment of the planktonic communities in northeastern Chukchi Sea: report for survey year 2012. (Hopcroft et al. 2013)

• Oceanographic a ssessment of the planktonic communities in northeastern Chukchi Sea: report for survey year 2013. (Hopcroft et al. 2014)

• Distribution and abundance of seabirds in the northeastern Chukchi Sea, 2008 (Gall and Day 2009)

.

• Distribution and abundance of seabirds in the northeastern Chukchi Sea, 2008 and 2009 (Gall and Day 2010)

.

• Marine mammal surveys at the Klondike and Burger survey areas in the Chukchi Sea during the 2008 open water season (Brueggeman 2009)

.

• Marine mammal surveys at the Klondike and Bur ger survey areas in the Chukchi Sea during the 2009 open water season (Brueggeman 20 1 0)

.

• Passive acoustic monitoring of marine mammals in the Chukchi Sea 9 September

– 14 October 2008 (The Cornell Lab of Ornithology 2010)

.

• Marine mammal distribution and ab undance in the northeastern Chukchi Sea during summer and early fall, 2008

- 2012 (Aerts et al. 2013)

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 2 March 2015
Revision 2 • Distribution and A bundance of S eabirds in the N ortheastern Chukchi Sea, 2008

- 2012 (Gall and Morgan, 2013)

.

• Distribution and abundance of seabirds in the northeastern Chukchi Sea, 2008

– 2013 (Gall et al.
2014).

• Oceanographic assessment of the planktonic communities in the northeastern Chukchi Sea (Hopcroft et al. 2013)

.

• Acoustic S urvey of F ishes in the Chukchi Sea E nvironmental S tudies P rogram in 2012 (Goodman et al. 2013)

.

• Chukchi Sea E nvironmental S tudies P rogram 2008

- 2012: B enthic E cology of the N ortheastern
Chukchi Sea (Blanchard and Knowlton, 2013)

.

• Northeastern Chukchi Sea Joint Acoustic Monitoring Program 2011

– 2012 (Delarue et al. 2013)

.

• Contine ntal Shelf Research. Seasonal and inter

- annual dynamics of the northeastern Chukchi Sea Ecosystem (Hopcroft and Day, 2013)

.

• Seasonal observations of carbonate chemistry and ocean acidification in 2013 (Mathis and Monacci 2014)

• Marine mammal distribution an d abundance in the northeastern Chukchi Sea from shipboard surveys during summer and early fall 2008

- 2013 (Aerts et al. 2014).

• Deep Sea Research Part II: Topical Studies in Oceanography. The Northern Chukchi Sea Benthic Ecosystem: Characterization, Biogeochemistry and Trophic Linkages ( Dunton et al. 2014)

.

• Physical oceanographic measurements in the northeastern Chukchi Sea: 2013 (Weingartner et al.
2014)

. In addition to the baseline surveys described above, Shell has partially funded U.S. Geological Survey ( USGS ) walrus tagging studies in the Chukchi Sea and ringed seal tagging studies in Kotzebue Sound with the Native Village of Kotzebue.

Shell has also collected a large amount of information regarding marine mammals in the northeastern Chukchi Sea, including the area of Shell’s Burger P rospect, through its marine mammal monitoring program associated with open water activities

. Data collec ted are summarized in the following reports :

• Funk, D. W., R. Rodrigues, D. S. Ireland, and W. R. Koski (eds.). 2007. Joint Monitoring Program in the Chukchi and Beaufort Seas, July

- November 2006. LGL Alaska Report P891

- 2, Report from LGL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., Bioacoustics Research Program, Cornell University, and Bio

- Wave Inc. for Shell Offshore, Inc., ConocoPhillips Alaska, Inc., and GX Technology, and National Marine Fisheries Service , U.S.
Fish and Wil dlife Service. 316 p. plus Appendices.

•Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 3 March 2015
Revision 2 • Funk, D.W., D.S. Ireland, R. Rodrigues, and W.R. Koski (eds.). 2010. Joint Monitoring Program in the Chukchi and Beaufort seas, open

- water seasons, 2006

– 2008. LGL Alaska Report P1050

- 3, Report from LGL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., and JASCO Research, Ltd., for Shell Offshore, Inc. and Other Industry Contributors, and National Marine Fisheries Service, U.S. Fish and Wildlife Service. 499 p. plus Appendices.

• Funk, D.W., D.S. Ireland, R. Rodrigues, and W.R. Koski (eds.). 201 1 . Joint Monitoring Program
in the Chukchi and Beaufort seas, open

- water seasons, 2006

– 2009. LGL Alaska Report P1050

- 2, Report from LGL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., and JASCO Applied Sciences, for Shell Offshore, Inc. and Other Industry Contributors, and National
Mari ne Fisheries Service, U.S. Fish and Wildlife Service.

• Funk, D.W., C.M. Reiser, D.S. Ireland, R. Rodrigues, and W.R. Koski (eds.). 2013. Joint Monitoring Program in the Chukchi and Beaufort seas, 2006

– 2010. LGL Alaska Final Report
P1213

- 2, Report from L GL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., and JASCO Research, Ltd., for Shell Offshore, Inc. and Other Industry Contributors, and National Marine Fisheries Service, U.S. Fish and Wildlife Service. 592 p. plus Appendices.

• Fu nk, D., D Hannay, D. Ireland, R. Rodrigues, W. Koski. (eds.) 2008. Marine mammal monitoring and mitigation during open water seismic exploration by Shell Offshore Inc. in the Chukchi and Beaufort Seas, July

– November 2007: 90

- day report. LGL Rep. P969

- 1. Rep. from LGL Alaska Research Associates Inc., LGL Ltd., and JASCO Research Ltd. for Shell Offshore

Inc

. , Nat ional Mar ine Fish eries Serv ice , and U.S. Fish and Wild life Serv ice. 218 pp plus appendices.

• Ireland, D.S., D.W. Funk.

, R. R odrigues, and W.R. Koski (eds.), 2009. Joint Monitoring Program in the Chukchi and Beaufort seas, open water seasons, 2006

– 2007. LGL Alaska Report P971

– 2, Report from LGL Alaska Research Associates, Inc., Anchorage, AK, LGL Ltd., environmental research associates, King City, Ont. , JASCO Research, Ltd., Victoria, BC, and Greeneridge Sciences, Inc., Santa Barbara, CA, for Shell Offshore, Inc., Anchorage, AK, ConocoPhillips Alaska, Inc., Anchorage, AK, and the National Marine Fisheries Service, Silver Springs, MD, and
the U.S. Fish a nd Wildlife Service, Anchorage, AK. 485 p. plus Appendices.

• Ireland, D.S., R. Rodrigues, D. Funk, W. Koski, D. Hannay. (eds.) 2009. Marine mammal monitoring and mitigation during open water seismic exploration by Shell Offshore Inc. in the
Chukchi and Bea ufort Seas, July

– October 2008: 90

- day report. LGL Rep. P1049

- 1. Rep. from LGL Alaska Research Associates Inc., LGL Ltd., and JASCO Research Ltd. for Shell Offshore

Inc

. , Nat ional Mar ine Fish eries Serv ice , and U.S. Fish and Wild life Serv ice . 277 pp, plus appendices.

• LGL Alaska Research Associates, Inc., JASCO Applied Sciences, Inc., and Greeneridge Sciences, Inc. 2013. Joint Monitoring Program in the Chukchi and Beaufort Seas, 2012. LGL Alaska Report P1272

- 2 for Shell Offshore, Inc. ION Geophysical, Inc ., and Other Industry Contributors, National Marine Fisheries Service, and U.S. Fish and Wildlife Service. 320 p. plus Appendices.

• LGL Draft Rep. P891

- 1. Rep. from LGL Alaska Research Associates Inc., Anchorage, AK, LGL Ltd., King City, Ont., and Greener idge Sciences Inc., Goleta, CA, for Shell Offshore Inc

. , Houston, TX, and Nat ional Mar ine Fish eries Serv ice , Silver Spring, MD. 199 p.

• Patterson, H., S.B. Blackwell, B. Haley, A. Hunter, M. Jankowski, R. Rodrigues, D. Ireland and
D. W. Funk. 2007. Marine mammal monitoring and mitigation during open water seismic exploration by Shell Offshore Inc. in the Chukchi and Beaufort Seas, July

– September 2006: 90

- day report.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 4 March 2015
Revision 2 • Reiser, C. M, D. W. Funk, R. Rodrigues, and D. Hannay. (eds.) 2010. Marine mammal monitoring and mitigatio n during open water seismic exploration by Shell Offshore, Inc. in the Alaskan Chukchi Sea, July

– October 2009: 90

- day report. LGL Rep. P1112

- 1. Rep. from LGL
Alaska Research Associates Inc. and JASCO Research Ltd. for Shell Offshore Inc

. , Nat ional

Mar ine Fish eries Serv ice , and U.S. Fish and Wild life Serv ice . 104 pp, plus appendices.

• Reiser, C.M, D.W. Funk, R. Rodrigues, and D. Hannay. (eds.) 2011. Marine mammal monitoring and mitigation during marine ge ophysical surveys by Shell Offshore, Inc. in the Alaskan Chukchi and Beaufort seas, July

– October 2010: 90

- day report. LGL Rep. P1171E

– 1. Rep. from LGL Alaska Research Associates Inc., Anchorage, AK, and JASCO Applied Sciences, Victoria, BC
for Shell Offs hore Inc

. , Houston, TX, Nat ional Mar ine Fish eries Serv ice , Silver Spring, MD, and
U.S. Fish and Wild life Serv ice , Anchorage, AK. 240 pp, plus appendices.

• Bisson, L.N., H.J. Reider, H.M. Patterson, M. Austin, J.R. Brandon, T. Thomas, and M.L. Bourdon. 2013. Marine mammal monitoring and mitigation during exploratory drilling by Shell in the Alaskan Chukchi and Beaufort Seas, July

– November 2012: Draft 90

- Day R eport. D.W. Funk, C.M. Reiser, and W.R. Koski, editors. LGL Rep. P1272D

– 1. Rep. from LGL Alaska Research Associates Inc., Anchorage, AK, USA, and JASCO Applied Sciences, Victoria, BC, Canada, for Shell Offshore Inc

. , Houston, TX, USA, National Marine Fishe ries Service , Silver Spring, MD, USA, U.S. Fish and Wildlife Service , Anchorage, AK, USA. 266 p p, plus appendices

.

• Reider, H.J., L.N. Bisson, M. Austin, A. McCrodan. J. Wladichuk, C.M. Reiser, K.B. Matthews, J.R. Brandon, K. Leonard, and H.M. Patterson. 2 013. Marine mammal monitoring and mitigation during Shell’s activities in the Chukchi Sea, July

– September 2013: 90

- Day Report . LGL Report
P1272D

– 2. Report from LGL Alaska Research Associates Inc., Anchorage, AK, USA, and JASCO Applied Sciences, Victoria , BC, Canada, for Shell Gulf of Mexico, Houston, TX, USA, National Marine Fisheries Service, Silver Spring, MD, USA, and U.S. Fish and Wildlife Service, Anchorage, AK, USA. 198 pp, plus appendices.

b) Physical Environment Reports

Arch a eological Assessments

Shell has conducted shallow hazards surveys at the six drill sites. Arch a eological resource assessments were conducted for each drill site based on geophysical data collected during the surveys. The shallow
hazard s survey reports and arch a eological asses sments have been submitted to BOEM under separate
cover as listed below.

• Fugro GeoC onsulting, Inc. 2010a

. Shallow H azards and A rchaeological A ssessment Burger Site Survey 1 OCS Lease Sale 193 area Chukchi Sea, Alaska. Report No. 27. 2009

- 2327 V. 1 & 2,

p repared by Fugro GeoC onsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

• Fugro Geo C onsulting, Inc. 2010b . Drill S ite C learance L etter P roposed Burger A D rill S ite Block
6764 OCS

- Y

- 2280 Posey Area, Chukchi Sea, Alaska. Report No. 27.20 10

- 2375

- 1 prepared by Fugro
GeoC onsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

• Fugro GeoC onsulting, Inc. 2010c

. Drill S ite C learance L etter P roposed Burger F D rill S ite Block
6714 OCS

- Y

- 2267 Posey Area, Chukchi Sea, Alaska

. Report No. 27.20 10

- 2375

- 3 prepared by Fugro
GeoC onsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

• Fugro GeoC onsulting, Inc. 2010d

. Drill S ite C learance L etter P roposed Burger S D rill S ite Block
6762 OCS

- Y

- 2278 Posey Area, Chukchi S ea, Alaska. Report No. 27.20 10

- 2375

- 4 prepared by Fugro
GeoC onsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 5 March 2015
Revision 2 • Fugro GeoC onsulting, Inc. 2010e

. Shallow H azards and A rchaeological A ssessment Burger Site Survey 3 OCS Lease Sale 193 ar ea Chukchi Sea, Alaska. Report No. 27. 2010

- 2342 V. 1 & 2, prepared by Fugro GeoC onsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

• Fugro GeoC onsulting, Inc. 2010f

. Drill S ite C learance L etter P roposed Burger V D rill S ite Block
6915 OCS

- Y

- 2324 Posey Area, Chukchi Sea, Alaska. Report No. 27.20 10

- 2375

- 6 prepared by Fugro
GeoC onsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

• Fugro GeoC onsulting, Inc. 2011a

. Shallow H azards and A rchaeological A ssessment Burger Sit e Survey 4 OCS Lease Sale 193 area Chukchi Sea, Alaska. Report No. 27.201 0

- 2343 prepared by Fugro GeoC onsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

• Fugro GeoC onsulting, Inc. 201 1b

. Drill S ite C learance L etter P roposed Burger R D rill S ite Block
6812 OCS

- Y

- 2294 Posey Area, Chukchi Sea, Alaska. Report No. 27.201 0

- 2375

- 7 prepared by Fugro
GeoC onsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

• Geoscience Earth & Marine Services (GEMS) , Inc. 2009. Shallow H azards and A rcheological
A ssessment, Burger J D rill S ite Posey Block NR03

- 02 6912, Chukchi Sea, Alaska . Prepared by Geoscience Earth & Marine Services, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Results of the shallow hazard s surveys ar e summarized in Section 3 .0 of th e Proprietary version of EP
Revision 2

. The results of the arch a eological assessments are discussed below a nd in more detail in
Section 3 .0 of the EIA (Appendix C ) and in the shallow hazards and arch a eological assessment reports for Burger J Site Survey ( GEMS 2009 ), Site Survey 1 (Fugro Geo C onsulting, Inc. 2 010a), Site Survey 3 (Fugro GeoC onsulting, Inc. 2010 e), and Site Survey 4 (Fugro GeoC onsulting, Inc. 201 1a ).

None of the EP blocks for this EP Re vision 2 or drill sites are located in areas that BOEM has identified as having high potential for occurrence of historic arch a eological resources. No potential arch a eological resources were identified at or near the Burger A, F, J, R, S, or V drill sites. No facilities, shipwrecks, significant debris, or other man

- made seafloor obstructions were detected during the shallow hazards surveys. The only man

- made object around the proposed sites is the legacy Burger #1 well and wet stored anchors at Burger A set in 2012

. The legacy Burger #1 well was drilled in 1989

- 1990 in Posey Area Block 6814 (Figure 3.0

- 2 of the Proprietary version of EP Revision 2 ). The historic well was plugged and abandoned in 1990, with all surface wellhead equipment contained well below the seafloor at the bottom
of the MLC. None of the observed un identified side

- scan sonar contacts and unidentified magnetic
anomalies is believed to be of arch a eological significance. Fugro GeoConsulting Inc. (2011a) recognized a cluster of seven unidentified magnetic anomalies in the southern portion of Burger Site Survey 4 and thought that they could represent debris of unknown origin and recommended they be avoided. The seven magneti c anomalies are outside the planned drill site area (Burger R drill site) and thus will be avoided.
All of the side

- scan sonar contacts and magnetic anomalies will be avoided during the exploration drilling operation s

.
All the EP blocks and drill sites are located in water depths of less than 200 ft. (60 m), which is generally considered to be the low stand of sea level approximately 13,000 years before present (YBP)

. Recent research in the Bering Sea suggests that the sea level was about 164 ft. (50 m) lo wer than present approximately 11,000 years ago. Between 9,000 YBP and 7,500 YBP the sea level rose from approximately 144 ft. (44 m) to 59 ft. (18 m) lower than present (GEMS 2009 )

. These rising marine waters would have inundated all of the planned drill site loc ations on the Burger Prospect. Early humans could have traversed presently inundated areas within the planned drill s ites up until about 9,000 YBP;
therefore , these areas, wh ich were sub

- aerially exposed prior to 9,000 YBP, could hold prehistoric
arch a eological resources. Such resources are most likely to occur along relict terrestrial landforms such as preserved levees or terraces associated with paleo

- river channels or s horelines.

Pleistocene buried channels have been identified in the area of the Burger A

, F , and S drill sites

. In all three of these cases, t he possible levees that might have been constructed on the sides of these subsurfaceRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 6 March 2015
Revision 2 channel features have likely been eroded during the last sea

- level rise

, and covered in turn by Holocene aged materials, thus the possibility of preserved arch a eologically significant sites has been decreased and the potential for disturbance of any such sites by exploration drilling operations is very low. No
Pleistocene channels were identified near the Burger J

, R, and V drill sites. Both Fugro and GEMS concluded that the potential for the occurrence and preservation of both prehistoric and historic cultural
resources at the identified Burger A, F, J, R, S, and V drill sites is very low.

Other Studies of the Physical Environment

Shell p articipated in the funding of a number of other types of baseline studies in 2008 through 2013 as part of a multi

- faceted study to gather data regarding resources in the project area , and Shell is contin uing
these studies

. The study focused on a 3 0 x 3 0 n mi study area (56 x 56 km) encompassing Shell’s Burger Prospect. The data collected during the course of these programs were used in the EIA. Final reports are currently available for the following:

• Physical oceanographic measurements in the Klondike and Burger survey area of the Chukchi Sea: 2008 and 2009 (Weingartner and Danielson 2010)

• Environmental studies in the Chukchi Sea 2008: chemical characterization ( Neff et al. 2010 )

• Chukchi Sea environmental studies baseline program : 2009 fish sampling chemistry results (Exponent 2010)

• Physical Oceanographic Measurements in the Northeastern Chukchi Sea: 2012 (Weingartner et al.
20 1 3)

• Seasonal Observations of carbonate chemistry and ocean acidification in 2012 (Mathis 2013)

Shell also collected oceanogr aphic information as part of the multi

- faceted baseline study conducted at Burger in 2008

- 201 3 as described above

. Shell :

• Deployed met eo rological buoy s (including wave and current sensors) in the Chukchi Sea near the Burger Prospect from 2008 through 201 2 (a buoy was not placed at the Burger Prospect in 2013 due to ice but a buoy was placed at the Popcorn and Crackerjack Prospect s ) and plans to continue to deploy these buoys yearly

.

• Deployed an acoustical wave and current meter in the Chukchi Sea n ear the Burger Prospect in 2008

- 2010; no current plans to continue this deployment of this particular instrument. However, Shell
continue s to deploy a seafloor mooring capable of measuring waves and currents at the site.

Shell intends to reestablish a mete orological and air quality monitoring station at Wainwright. Data ha ve been collected and reported for November 2008 through December 201 3 in the following reports, which indicate that measured concentrations of air pollutants are well below National Ambie nt Air Quality
Standards ( NAAQS )

.

• AECOM, Inc. 2009a. Wainwright near

- term ambient air quality monitoring program first quarter data report November 2008 through January 2009 final. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.

• AECOM, Inc. 2009b. Wainwright nea r

- term ambient air quality monitoring program second quarter data report February through April 2009 final. Document No. 01865

- 104

- 3220 prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.

• AECOM, Inc. 2009c. Wainwright near

- term ambient air quality monitoring program third quarter data report May through July 2009 final. Document No. 01865

- 104

- 3230 prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 7 March 2015
Revision 2 • AECOM

, Inc

. 2009 d . Wainwright near

- term ambient air quality monitor ing program fourth quarter data report August through October 2009 final. Document No. 60136620

- 32 4 0 prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.

• AECOM, Inc. 2010a. Wainwright near

- term ambient air quality monitoring program an nual data report November 2008 through November 2009 final. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.

• AECOM, Inc. 2010b. Wainwright permanent ambient air quality monitoring program first quarter data repo rt January through March 2010 final. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.

• AECOM, Inc. 2010c. Wainwright permanent ambient air quality monitoring program second quarter data report April through June 2010 draft. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.

• AECOM, Inc. 2010d. Wainwright permanent ambient air quality monitoring program third quarter data report July through September 2010 draft. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.

• AECOM, Inc. 2011 a

. Wainwright permanent ambient air quality monitoring program fourth quarter data report October through December 2010 draft. Unpublished repor t prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK

.

• AECOM, Inc. 2011b. Wainwright permanent ambient air quality monitoring program annual data report January 2010 through December 2010 final. Unpublished report prepared by AECOM, Inc . for ConocoPhillips Alaska, Inc. Anchorage, AK

.

• SLR International Corp. 201 3 a. Wainwright permanent ambient air quality monitoring program annual data report January 2012 through December 2012 final. Unpublished report prepared by SLR International Corp. for ConocoPhillips Alaska, Inc. Anchorage, Alaska.

• SLR International Corp. 2013 b . Wainwright permanent ambient air quality monitoring program quarterly data report January 2013 through March 2013 final. Unpublished report prepared by SLR International Corp . for ConocoPhillips Alaska, Inc. Anchorage, Alaska.

• SLR International Corp. 2013 c . Wainwright permanent ambient air quality monitoring program quarterly data report April 2013 through June 2013 final. Unpublished report prepared by SLR International Corp. for ConocoPhillips Alaska, Inc. Anchorage, Alaska.



### • SLR International Corp. 2013 d . Wainwright permanent ambient air quality monitoring program quarterly data report July 2013 through September 2013 final. Unpublished report prepared by SLR
International Co rp. for ConocoPhillips Alaska, Inc. Anchorage, Alaska.

M eteorological and air quality data were also collected at Point Lay as detailed in the following reports:

• Point Lay Comprehensive Ambient Air and Meteorological Monitoring Program, Annual Data Summary for June 1, 2010

– May 31, 2011. Unpublished report by SLR Consulting, Inc. for Shell Offshore Inc., Anchorage, Alaska, Sep. 2011 (SLR 2011).

• 2012 Annual Data Report, Poi nt Lay Comprehensive Ambient Air and Meteorological Monitoring Program, Jan. 1

– Dec. 31, 2012. Unpublished report by SLR Consulting, Inc. for Shell Gulf of Mexico Inc., Anchorage, Alaska, Feb. 2013 (SLR 2013b).



### • 2013 Annual Data Report, Point Lay Comprehen sive Ambient Air and Meteorological Monitoring Program, Jan. 1

– Dec. 31, 2013. Unpublished report by SLR Consulting, Inc. for Shell Gulf of Mexico Inc., Anchorage, Alaska, Feb. 2014 (SLR 2014).Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 8 March 2015
Revision 2 c) Socioeconomic Study Reports

Shell continues with its Plan of Cooperation (POC) meetings, as required by the National Marine Fisheries Service ( NMFS ) , USFWS and BOEM in order to gather comments and questions and to address the concerns of the communities that are potentially affected by the planned exploration drilling program.

In addition, Shell offers several programs that involve the training and subsequent hiring of local residents. Programs include the following:

• Protected Species Observer ( PSO ) Program: The PSO program involves intensive training for marine mammal identification and documentation, computer use, and health and safety. Some PSO s are recruited locally from North Slope communities to work during exploration drilling activities, including the planned exploration drilling program.

• Subsistence Advisor (SA) Program: In the SA program, potentially affected villages are represented by one of its residents to relay subsistence information and issues to Shell. The SA speaks with other village members and documents subsistence information. This information may then be integrated
into Shell ’s exploration drilling program.

• Community Liaison Officer (CLO) Program: The CLO program plans to include community liaisons
in Wainwright

, Point Hope, Point Lay, Barrow, Kaktovik , Nuiqsut, Kotzebue, Nome, and Dutch
Harbor that serve as Shell’s point of contact for questions regarding Shell activities and programs in
the area.

• Cultural Awareness Program: Shell and contractor personnel inv olved in field operations (i.e., deployed north of Fairbanks, either onshore or offshore) during the planned exploration drilling program will attend an initial and annual refresher orientation , which addresses environmental, social,
and cultural concerns related to the project area. The program is designed to increase sensitivity and understanding by Shell and its contractors regarding community values, customs, and lifestyles in the area they will be working, and how to avoid conflicts with Native Alaskan s and their subsistence
activities. The program stresses the importance of not disturbing archaeological and biological resources and habitats, including endangered species, fisheries, bird colonies, and marine mammals and provides guidance on how to avoid disturbance. The program is discussed in more detail in
Section 11.

Shell collected information on the use of coastal areas along the Chukchi Sea for subsistence through its SA Program. Data were collected through a number of person

- to

- person interview s. Subsistence users from Barrow, Wainwright, Point Lay, and Point Hope were interviewed. R eport s were prepared summarizing and mapping the results of these interviews

.
The following Arctic Slope Regional Corporation ( ASRC ) Energy Services (2009 , 2010 ) and UMIAQ (2011 , 2012, 2013 and 2014 ) SA reports were previously submitted to BOEM

.

• ASRC Energy Services. 2009. Subsistence advisor program s ummary, North Slope, Alaska

. Report prepared for Shell Exploration and Production Company, Houston, TX by ASRC Energy Services, Anchorage, AK

.

• ASRC Energy Services

. 2010. 2009 Subsistence Advisor Program Annual Summary North Slope,
Alaska. Prepared for Shell Exploration and Production Company. An chorage, AK by ASRC Energy Services, Anchorage, AK. December 2009.

• UMI A Q. 2011. 2010 Subsistence advisor program North Slope, Alaska. Report prepared by UMIAQ, Anchorage, AK for Shell Exploration & Production Company, Anchorage, AK

.

• UMIAQ

. 2012

. 201 1 Subsistence advisor program North Slope, Alaska. Report prepared by UMIAQ, Anchorage, AK for Shell Exploration & Production Company, Anchorage, AK

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5

- 9 March 2015
Revision 2 • UMIAQ

. 2013

. 201 2 Subsistence advisor program North Slope, Alaska. Report prepared by UMIAQ, Anchorage , AK for Shell Exploration & Production Company, Anchorage, AK

.

• UMIAQ

. 2014

. 201 3 Subsistence advisor program North Slope, Alaska. Report prepared by UMIAQ, Anchorage, AK for Shell Exploration & Production Company, Anchorage, AK

.
Shell conducted intervi ews with residents of Barrow, Wainwright, Point Lay, and Point Hope to supplement existing formal environmental and resource data for the Chukchi Sea coastline. Data collected pertained to hunting, fishing, land use, and coastal processes such as erosion, ice movement and melting, and coastal dynamics. A report was prepared summarizing and mapping the results of these interviews. The report (Sound Enterprises and Associates, LLC 2008) has been submitted to the BOEM

. Results of these interviews were used in the preparation of the EIA (Appendix C ).

• Sound Enterprises and Associates, LLC. 2008. Shell Exploration & Production Company (SEPCO) Chukchi Village interview program

. Report prepared for Shell Exploration and Production Company Houston, TX by Sound Enterprises, LLC, Bainbridge, WA.

Shell also conducted an economic analysis of future oil and gas exploration and development in the Beaufort Sea, Chukchi Sea, and North Aleu tian Basin. The r esults (Northern Economics 2009, Northern Economics, Inc. and Institute of Social and Economic Research 2011 ) of the analyse s have been presented to BOEM and were used in preparation of the EIA , where summaries can be found

.

• Northern Economics Inc . 2009. Economic analysis of future offshore oil and gas d evelopment: Beaufort Sea, Chukchi Sea, and North Aleutian Basin

. Report prepared by Northern Economics, Anchorage Alaska for Shell Exploration and Production, Houston, TX.

• Northern Eco nomics, Inc. and Institute of Social and Economic Research. 2011. Potential National

Level Benefits of Alaska OCS Development. Report prepared by Northern Economics, Inc. and Institute of Social and Economic Research, Anchorage, AK for Shell Exploration & Production, Anchorage, AK.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 1 March 2015
Revision 2 

## SECTION 6.0 SOLID AND LIQUID WAS TE AND DISCHARGE
INFORMATION

a) Projected Generated Wastes

The type, composition, and amount of solid and liquid waste projected to be generated on the drilling
units during the planned exploration drilling program at the planned drill site s are listed below . Waste and discharge volumes were calculated based on empirical information and past experience; therefore, the actual generated amounts and ocean discharge volumes may differ from these projections

.

b) Ocean Discharges and Disposal Methods

The type, composition, and amount of solid and liquid waste projected to be generated on the drilling
units during the planned exploration drilling program and discharged to the ocean are listed below in
Tables 6. b

- 1 and 6. b

- 2

. Regarding Table 6.b

- 1, drilling fluids and cuttings can be further divided into the following six drilling intervals, as noted in the EIA (Appendix C), based on the section of the well being
drilled:

• Int erval 1

– MLC (and ramp if the MLC ROV System is used) (discharged at the seafloor)

• Interval 2

– conductor casing (discharged at the seafloor)

• Interval 3

– surface casing (discharged at the seafloor)

• Interval 4

– intermediate casing (discharged near the surface)

• Interval 5

– drilling liner (discharged near the surface)

• Interval 6

– open hole (discharged near the surface)

NPDES exploration facilities GP AKG

- 28

- 8100 discharge 01 3 (D013) includes the discharges from
intervals 1 through 3 , and discharge 001 (D001) includes the discharges from intervals 4 through 6.

The ocean discharge information has been su bmitted to the EPA to support NOIs for authorization to conduct these discharges under NPDES exploration facilities GP AKG

- 28

- 81 00

. The projected wastes and discharges listed in these tables are applicable only to the drilling units

. Discharges from support vessels will be made pursuant to the International Convention for the Prevention of Pollution from Ships (Marine Pollution or International Convention for the Prevention of Pollution from Ships [ MARPOL ] ) standards and requirements as well as the NP DES Vessel GP

.
Additional details r egarding the transportation and final disposal location for wastes that will not be discharged to the ocean (Table 6. b

- 3 ) are provided in Section 13

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 2 March 2015
Revision 2 Table 6.b

- 1 NPDES Exploration Facilities GP Waste Streams Generated During Drilling

NPDES GP Discharge No. and Composition Discharge
Location Projected Discharge Rate Projected Season Volume Disposal

D001 1

Water

- based drilling fluids and drill cuttings ( Intervals 4

- 6 ) Burger A 81 bbl/hr. while drilling ; 1000 bbl/hr. for reserve pit
volume Cuttings

- 1,052 bbl
Fluids

– 6,231 bbl Total while drilling

– 7,283 bbl Reserve pit fluid volume

– 2,427 bbl
Total with reserve

– 9,710 bbl Discharged to the ocean through a disposal caisson

Burger F 80 bbl/hr. while drilling ; 1000 bbl/hr. for reserve pit
volume Cuttings

- 1,043 bbl
Fluids

– 6,184 bbl Total while drilling

– 7,227 bbl Reserve pit fluid volume

– 2,427 bbl
Total with reserve

– 9,65 4 bbl Discharged to the ocean through a disposal caisson

Burger J 72 bbl/hr. while drilling ; 1000 bbl/hr. for reserve pit
volume Cuttings

– 915 bbl
Fluids

– 5,546 bbl Total while drilling

– 6,461 bbl Reserve pit fluid volume

– 2,427 bbl
Total with reserve

– 8,888 bbl Discharged to the ocean through a disposal caisson

Burger R 83 bbl/hr. while drilling ; 1000 bbl/hr. for reserve pit
volume Cuttings

- 1,077 bbl
Fluids

– 6,352 bbl Total while drilling

– 7,429 bbl Reserve pit fluid volume

– 2,427 bbl
Total with reserve

– 9,856 bbl Discharged to the ocean through a disposal caisson

Burger S 82 bbl/hr. while drilling ; 1000 bbl/hr. for reserve pit
volume Cuttings

- 1,074 bbl
Fluids

– 6,340 bbl
Total while drilling

– 7,414 bbl Reserve pit fluid volume

– 2,427 bbl
Total with reserve

– 9,841 bbl Discharged to the ocean through a disposal caisson

Burger V 88 bbl/hr. while drilling ; 1000 bbl/hr. for reserve pit
volume Cuttings

- 1,153 bbl
Fluids

– 6,736 bbl Total while drilling

– 7,889 bbl Reserve pit fluid volume

– 2,427 bbl
Total with reserve

– 10,316 bbl Discharged to the ocean through a disposal caisson

D012 Excess cement slurry (rinsate from cement tank) Each drill
site 5 bbl/casing string and when setting plugs Discoverer

- 45 bbl Discharged to the ocean through a disposal caisson 5 bbl/casing string and when setting plugs Polar Pioneer

– 45 bbl

D013 2,3 Muds, cuttings, cement
at the seafloor (Intervals 1

- 3) Burger A 47.4 bbl/hr. while drilling Estimated at 5,007 bbl (this section completed in 2012) Discharged at the
ocean floor Burger F 77 bbl/hr. while drilling MLC Cuttings

– 3,703 bbl; Conductor and Surface Casing Cuttings

– 1,303 bbl;
Fluids

– 3,124 bbl;
Cement

- 45 bbl; Total while drilling using MLC bit

– 8,175 bbl Discharged at the
ocean floor

162 bbl/hr. MLC cuttings only if using the MLC ROV
system 4

– 27,197 bbl Discharged at the
ocean floorRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 3 March 2015
Revision 2 Table 6.b

- 1 NPDES Exploration Facilities GP Waste Streams Generated During Drilling

NPDES GP Discharge No. and Composition Discharge
Location Projected Discharge Rate Projected Season Volume Disposal

D013 2,3 Muds, cuttings, cement
at the seafloor ( Intervals 1

- 3 ) Burger J 79 bbl/hr. while drilling MLC Cuttings

– 3,703 bbl Conductor and Surface Casing Cuttings

– 1,386 bbl;
Fluids

– 3,207 bbl;
Cement

- 45 bbl; Total while drilling using MLC bit

– 8,341 bbl Discharged at the
ocean floor

162 bbl/hr. MLC cuttings only if using the MLC ROV
system 4

– 27,197 bbl Discharged at the
ocean floor Burger R 77 bbl/hr. while drilling MLC Cuttings

– 3,703; Conductor and Surface Casing Cuttings

– 1,300 bbl;
Fluids

– 3,121 bbl;
Cement

- 45 bbl; Total while drilling using MLC bit

– 8,169 bbl Discharged at the
ocean floor

162 bbl/hr. MLC cuttings only if using the MLC ROV
system 4

– 27,197 bbl Discharged at the
ocean floor Burger S 77 bbl/hr. while drilling MLC Cuttings

– 3,703; Conductor and Surface Casing Cuttings

– 1,302 bbl;
Fluids

– 3,123 bbl;
Cement

- 45 bbl; Total while drilling using MLC bit

– 8,173 bbl Discharged at the
ocean floor

162 bbl/hr. MLC cuttings only if using the MLC ROV
system 4

– 27,197bbl Discharged at the
ocean floor Burger V 79 bbl/hr. while drilling MLC Cuttings

– 3,703; Conductor and Surface Casing Cuttings

– 1,386 bbl;
Fluids

– 3,207 bbl;
Cement

- 45 bbl; Total while drilling using MLC bit

– 8,341 bbl Discharged at the
ocean floor

162 bbl/hr. MLC cuttings only if using the MLC ROV
system 4

– 27,197 bbl Discharged at the
ocean floor

1 E stimated time to drill these bottomhole sections is 90 hr. drilling time (does not include non

- drilling time)

2 E stimated time to drill these tophole sections is 106 hr. drilling time (does not include non

- drilling time)

. R eserve pit volume (2,427 bbl) is for the Polar

Pioneer ; the Discoverer has a reserve pit volume of 1,500 bbl. This table assumes the greatest possible pit volume will be discharged. The EIA (Appendix C) also assumes the larger pit volume in its analys es.
3 MLC construction time using the MLC ROV s ystem is estimated at 168 hr.

4 MLC ROV s ystem cuttings volumes and rates are only for the potential construction of the MLC using this technology ; MLC ROV s ystem is not capable of drilling the conductor and surface casing sectionsRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 4 March 2015
Revision 2 Table 6.b

- 2 NPDES Exploration Facilities GP Waste Streams Generated Daily

Type of Waste

NPDES GP Discharge Composition Projected Discharge Rate Projected Season
Volume 1 Treatment, Storage, and Disposal

D002
Deck D rainage Uncontaminated
fresh or seawater Discoverer

– 33 bbl/day 3,960 bbl U ncontaminated water discharged overboard; contaminated water is
treated in an oil

- water separator (OWS) ; oily water stored aboard, transported by boat to approved treatment/disposal/storage ( TDS )
site

Polar Pioneer

- 70 bbl/day 8,400 bbl U ncontaminated water discharged overboard; contaminated water is
treated in an OWS ; oily water stored aboard, transported by boat to approved TDS site

D003 Sanitary W astes Black water Discoverer

– 29.5 bbl/day discharge (based on 124

persons ; 10 gallons [ gal ] /person/day ) 3,540 bbl Discharged through disposal
caisson after treatment in a marine sanitation device

Polar Pioneer

– 14.3 bbl/day (based on 114

persons; 5.3 gal/person/day) 1,716 bbl

D004
Domestic

W astes Gray water (laundry, galley, lavatory) Discoverer

- 295 bbl/day discharge (based on 124 persons) 35,400 bbl Discharged through disposal
caisson

Polar Pioneer

- 271 bbl/day (based on 114 persons) 32,520 bbl

D005
Desalination

U nit W astes Rejected water from
watermaker unit Discoverer

- 1,742 bbl/day 209,040 bbl Discharged through disposal
caisson Polar Pioneer

- 377 bbl/day 45,286 bbl

D006
BOP F luid Freshwater,
concentrate and monoethylene glycol Discoverer

- 16 .6 bbl/test 150 bbl (based
on 3 function tests, 3 pressure
test and 3 retests) Discharged to the ocean

Polar Pioneer

- 20 bbl/test 180 bbl (based
on 3 function tests, 3 pressure
test and 3 retests)

D007
Boiler
Blowdown Water and minerals
drained from boiler
drums Discoverer

- 1.3 bbl/day 151 bbl Discharged through disposal
caisson

Polar Pioneer

- 6 bbl/day 754 bbl Discharged directly overboard

D008
Fire Control System Test

Water Uncontaminated

seawater Discoverer

- 36 bbl/ test (tested weekly) 607 bbl Discharged directly overboard

Polar Pioneer

- 36 bbl/ test (tested monthly) 607 bblRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 5 March 2015
Revision 2 Table 6.b

- 2 NPDES Exploration Facilities GP Waste Streams Generated Daily

Type of Waste

NPDES GP Discharge Composition Projected Discharge Rate Projected Season
Volume 1 Treatment, Storage, and Disposal

D009
Non

- contact cooling water Uncontaminated

seawater Discoverer

– 107,314 bbl/day discharge while drilling; 55,200 bbl/day discharge while not drilling Range of 6,624,000

– 12,877,680 bbl Discharged overboard to ocean
waters at several sites around the
hull

Polar Pioneer

– 21,385 bbl/day 2,566,240 bbl Discharged to ocean through a
number of outlets

D010
Uncontaminated
ballast water Uncontaminated

seawater Discoverer

– variable 37,915 bbl Discharged through disposal
caisson Polar Pioneer

– 719 bbl/day plus 85,655 bbl when the drilling unit is moved 171,935 bbl

D011 Bilge water Seawater that
collects in internal parts of the drilling
vessel hull Discoverer

- 754 bbl/day 90,514 bbl Treated in OWS, uncontaminated water discharged through disposal caisson, oily water stored aboard, transported by boat to approved
TDS site Polar Pioneer

- 714 bbl /day 85,714 bbl

1 Based on a n assumed drilling season of approximately 120 daysRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 6 March 2015
Revision 2 T able 6. b

- 3 Wastes G enerated on the D rilling U nits t hat a re n ot D ischarged *

Type of Waste Composition Projected Generated

Amount Treatment / Storage/ D ispos al

Household T rash Refuse generated through domestic living activities (includes food wastes)

. 8

, 500 lb. /month/drilling
unit stored and transported for disposal ; 6

, 000 lb. /month/drilling
unit incinerated
onboard

- resulting ash weight of 200 lb.
included in non

hazardous waste monthly total Not discharged to ocean waters; b urned
in on

- board incinerator or stored aboard in approved waste containers until removed at port and transferred to an approved TDS site

Non

- Hazardous

Waste (solid and liquid) Non

- hazardous waste liquids and solids such as used oils, oily rags, vessel slops; incinerator ash; steel (to be recycled); generated through vessel cleaning, maintenance and drilling operations. 62,500
lb. /month/drilling unit Not discharged to ocean waters; stored aboard in approved waste containers until removed at port and transferred to an approved TDS site

Hazardous W aste ( Conditionally Exempt Small Quantity Generator [ CE S QG ] ) Expired or spent chemicals
left over from cl eaning, maintenance and drilling operations. 50 lb. /month/drilling
unit (CESQG status is anticipated) Not discharged to ocean waters; stored aboard in approved UN rated waste containers until removed at port and transferred to an approved TDS site

*Sol id and hazardous wastes are portrayed differently in this Table 6.b

- 3 than they were in EP Revision 1. EP Revision 1 reported the non

discharged wastes on a per well basis, measured in barrels. EP Revision 2 reports the non

- discharged wastes on a monthly basis, measured in pounds.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 7 March 2015
Revision 2 c) NPDES Permit s
All discharges from the drilling units while anchored at a drill site during the exploration drilling program (as itemized above in Tables 6. b

- 1 and 6. b

- 2 ) will be made in accordance with the EPA NPDES exploration facilities GP AKG

- 28

- 81 00.

Drilling support vessels in excess of 300 gross registered tons or having a ballast capacity of 2,133 gallons (gal) (8 m 3 ) or greater

, must acquire authorization to discharge under the Vessel GP for Discharges Incidental to the Normal Operation of Commercial Vessels a nd Large Recreational Vessels. Authorizations to discharge under this V essel GP for discharges incidental to normal operat ions will be undertaken by the vessel owner and/or operator and is not a part of Shell’s required permit and authorization application submittals.

Drilling Fluid Products

P roducts that may be part of the drilling fluid are provided in Table s 6.c

- 1 and 6.c

- 2, on a per well basis

. This component list and the respective volumes have been designed for drilling depth from the MLC to
PTD

.

Table 6.c

- 1 Drilling Fluid Components for the U pper P ortions of the W ell (MLC, C onductor and
S urface

- C ased S ections)

Generic Description Product Name Maximum Concentration

BASE FLUID Biopolymer DUOVIS 5 lb

. /bbl

Bentonite M

- I GEL 35 lb

. /bbl

Bentonite extender GELEX 0.05 lb

. /bbl Polyanionic cellulose Polypac Supreme UL 5 lb

. /bbl
ADDITIVES
Crushed nut hulls NUT PLUG 20 lb

. /bbl
CONTINGENCY PRODUCTS
Barite M

- I WATE 160 lb

. /bbl

Defoamer DEFOAM

- X 0.3 lb

. /bbl Dye Sodium Fluoresceine Green Dye 0.5 gal/bbl in

seawater
Caustic soda stock product 8 lb

. /bbl

Citric acid stock product 5 lb

. /bbl

Sodium acid pyrophosphate (SAPP) stock product TBD
Soda ash stock product 13 lb

. /bbl

Biocide Busan 1060 0.4 lb

. /bbl

NaCl brine Sodium chloride brine 100 lb

. /bbl Hydrogen sulfide scavenger SAFE

- SCAV HS 0.1 lb

. /bbl

Surfactant SCREENKLEEN 2% v/v

Lubricant DRILLZONE 7% v/vRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 8 March 2015
Revision 2 Table 6.c

- 2 Drilling Fluid Components for the lower portions of the well after the riser and BOP
are established

Generic Description Product Name Maximum Concentration

BASE FLUID
Soda ash stock product 12 lb

. /bbl Acrylic polymer IDCAP D 5 lb

. /bbl Shale/clay inhibitor EMI

- 2009 20 lb

. /bbl Shale/clay inhibitor KLA

- STOP 20 lb

. /bbl Biopolymer DUOVIS 2 lb

. /bbl Biopolymer Flowzan 2 lb

. /bbl Polyanionic cellulose POLYPAC SUPREME UL 5 lb

. /bbl Sodium hydroxide Caustic Soda 8 lb

. /bbl

Barite M

- I WATE 160 lb

. / bbl

Sodium chloride in brine Salt/NaCl 100 lb. /bbl
ADDITIVES Copolymeric shale stabilizer POROSEAL 19 lb

. /bbl

Deflocculant CF Desco®II 4 lb

. / bbl

Sodium bicarbonate stock product 10 lb

. /bbl

Citric acid stock product 4 lb

. /bbl Liquid defoamer DEFOAM

- X 0.3 lb

. /bbl Liquid defoamer DF

- 9065 0.3 lb

. /bbl

Crushed nut hulls NUT PLUG MED 40 lb

. /bbl

Crushed nut hulls NUT PLUG FINE 40 lb

. /bbl Vegetable, polymer fiber blend MI SEAL 40 lb

. /bbl

Cellulose fiber MIX II Fine 25 lb

. /bbl

Cellulose fiber MIX II MED 25 lb

. /bbl Graphite G

- SEAL 20 lb

. /bbl

Calcium carbonate SAFECARB

- 20 200 lb

. /bbl

Calcium carbonate SAFECARB

- 40 200 lb

. /bbl

Calcium carbonate SAFECARB

- 250 200 lb

. /bbl

Sodium chloride stock product 100 lb

. /bbl

Resinated lignite RESINEX 10 lb

. /bbl Sulfonated asphalt ASPHASOL SUPREME 8 lb

. /bbl
CONTINGENCY PRODUCTS
Mixture FORM

- A

- BLOK 40 lb

. /bbl

Cellulose FORM

- A

- SET AK Formulation pill

H 2 S Scavenger Sulf

- X 2.5 lb

. /bbl

Biocide Busan 1060 0.4 lb

. /bbl

Mixture Pipelax ENV WH 4% v/v

Mixture LUBE 945 3% v/v

Mixture CLEAN SPOT 4% v/v
Surfactant SCREENKLEEN 2% v/v

Lubricant DRILLZONE 7% v/v

Mixture SAFE

- SCAV HS 0.1 lb

. /bblRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 9 March 2015
Revision 2 Cement Composition

Two types of cement discharges are expected. One of these discharges involves bulk cement plus
additives , which are circulated around the conductor and surface casing, and collect in the base of the
MLC . T he cement cures to a hardened mass surrounding the conductor. The second type of cement discharge involves small volumes of cement washed from the cement pump and lines on the drilling unit at the surface after cementing operations. The cement slurry to be discharged to the ocean (Table 6.b

- 1, D012) consists of the following primary components and additives , or their equivalents:

• Type C Permafrost cement

• API Class G “Premium” cement

• Econolite L (fly ash, calcium oxide) in small amounts

• Halad

- 344EXP (fluid loss additive) in very small amounts

• Calcium sulfate hemihydrate (accelerator) very small amounts

• Sodium chloride (accelerator) in very small amounts

• Calcium chloride (accelerator) in very small amounts

• SCR

- 100 (sodium citrate retarder) in very small amounts

• Dual Space r (s urfactant blend) in trace amounts

• Fresh water (mixing fluid)

• Seawater (wash water)

Blowout Preventer Fluid Composition

BOP fluid is a pressured fresh water

- based fluid used to operate various components of the SS BOP including rams, locking mechanisms, annular preventers, choke and kill line valves and the hydraulic connectors to the wellhead and to the lower marine riser package (LMRP) . The fluid is discharged at the device after use rather than bringing it back to the surface in a closed loop system. T his reduces back

pressure and increases the potential that the devices will function quickly. Only small volumes of BOP fluid are discharged within and just above the MLC (or directly to the ocean if a test is done on the drilling unit deck prior t o installation) which dilute and diffuse quickly in the seawater column. It is
estimated that nine BOP tests will occur during the drilling of each well for a total of 113 bbl ( Discoverer ) and 180 bbl ( Polar Pioneer ) of BOP fluid per well ( Table 6. b

- 2 , D006 ). The BOP fluid will be a mixture of fresh water (~ 45%), concentrate (~5%) and monoethylene glycol (~50%). The concentrates may contain, but not limited to, Stack Magic, Erifon HD603, and/or Pelagic

.

d) Modeling Report

All requested exploration facility NPDES permitted discharges will be carried out in federal waters of the
OCS. No expanded mixing zones or zones of deposit are being requested and no modeling was conducte d in support of such requests. Shell has carried out modeling of the expected discharges of drill cuttings and drilling fluids and of the projected discharges of cooling water for impact assessmen t purposes. The
results of these modeling effort s are discussed in Section 4 of the EIA ( Appendix C ).Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6

- 10 March 2015
Revision 2 e) Cooling Water Intake

Discoverer

A saltwater service system supplies the Discoverer’s requirement for saltwater, including that for the exploration drilling operations. The system is primarily used to supply cooling water to equipment heat exchangers. The amount of seawater that will be used for non

- contact cooling water while drilling is
estimated at 107,314 bbl/day and 55,200 bbl/day discharge while not drilling

. This volume includes cooling water for hydraulic coolers, air

- conditioning coolers and all other coo ling water service lines. This does not include the seawater volume that would be supplied by the fire water pumps to provide firefighting capability in an emergency situation.

The saltwater service system consists of saltwater pumps , four sea

- suctions ( each with strainer having
holes 5 mm in diameter), and associated distribution piping. Screen mesh sizes on the water intakes are provided below in Table 6.e

- 1.

T able 6. e
- 1 Screen Mesh Size on Water Intakes on the Discoverer

Sea

- suction Screen Mesh Size Pump room Sea Suction 0.2 in

. (5.0 mm) diameter holes in plate Lower Engine Room Sea Suction 0.2 in

. (5.0 mm) diameter holes in plate Upper Engine Room Sea Suction 0.2 in

. (5.0 mm) diameter holes in plate

Generator Room Sea Suction 0.2 in

. (5.0 mm) diameter holes in plate

The calculated velocity of intake water across the sc reens is approximately 40 f t. per minute ( ft

. / min ) ( 12.2 m / min ).

Polar Pioneer

Non

- contact cooling water is supplied to the Polar Pioneer via a general services seawater loop. Seawater is pumped from four screened sea chests; located on the inboard side of the Polar Pioneer’s four pontoons (Table 6.e

- 2) . The amount of seawater that will be used for non

- contact cooling water is
estimated at 21,385 bbl per day.

Table 6.e

- 2 Screen Mesh Size on Water Intakes on the Polar Pioneer

Sea

- suction Screen Mesh Size
Aft Starboard 0.75 in. (19 mm) Height; 25.75 in. (654 mm) width

Forward Starboard 0.75 in. (19 mm) Height; 25.75 in. (654 mm) width

Aft Port 0.75 in. (19 mm) Height; 25.75 in. (654 mm) width

Forward Port 0.75 in. (19 mm) Height; 25.75 in. (654 mm) width

The calculated velocity of intake water across the screen mesh is calculated to be 0.8 ft. /min (0.25 m/min).Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 7

- 1 March 2015
Revision 2 

## SECTION 7.0 AIR EMISSIONS INFORMATION

This section identifies the sources of air emissions and projected emissions from Shell’s EP Revision 2

. The information presented in this section is supported by detailed emission information in Appendix K , AQRP
and NEPA Emission Inventories

. In accordance with BOEM ’s Air Quality Regulatory Program (AQRP) (30 CFR Part 550, Subpart C), facility

- wide maximum projected emissions generated from the proposed exploration activities are calculated and compared to the BOEM exemption formulas established in 30 CFR 550.303(d). Shell includes in this assessment emissions from the Discoverer and Polar Pioneer drilling units and all support vessels operating within 25 mi (40 km) of the Discoverer and Polar Pioneer while each are anchored at a drill site. The following is a list of the vessel types that are included for the air emissions evaluation under 30 CFR 550.303(d):

• Drilling U nit

– Discoverer (x1)

• Drilling U nit

– Polar Pioneer (x1)

• I ce Management V essels (x2)

• A nchor handlers (x3)

• OSVs (x2)

• Science V essels (x2)

• OSR V (x1)

• OSR t ug (x1) and barge (x1)

• S upport tugs (x2)

• S upply tug ( x1; used for support purposes)

• OST (x1)

• MLC ROV s ystem vessel (x1)

As required under 30 CFR 550.224, information on support vessels and aircraft that may be used in the exploration drilling program is d escribed in Section 13. I nformation on the onshore support facilities as required under 30 CFR 550.225 is included in Section 14

.

a) Projected Emissions

For the BOEM AQRP, an AQRP emissions inventory is provided in Appendix K that includes detailed documentation of projected emissions including the basis for all calculations (30 CFR 550.218(a)(2)) attributable to operation of the Discoverer, Polar Pioneer and support vessels operating within 25 mi (40 km) of the drilling units while each are anchored at a drill site . For purposes of evaluating air emissions under the AQRP, it is estimated that up to two wells may be drilled per season to complete the six we lls in a total of three years. Appendix K (Table A

- 1 of Attachment A) includes peak hourly emissions for the AQRP as required under 30 CFR 550.218(a)(1)(i). T he peak hourly emissions presented in Table A

- 1 of Attachment A in Appendix K are representative of peak emission s in each of the three years.

Appendix K provides the annual emissions as require d by 30 CFR 550.218(a)(1)(ii). Annual emissions are
based on a maximum 120

- day drilling season per year. The information in these tables p rovides a summary of emissions from each source category type for each drilling unit and support ves sel. Details on the components that contribute to emissions (e.g., propulsion engines, generation engines, boilers, and incinerators) as well as the operati onal assumptions applied in the emission estimates are provided in Appendix K. A summary of annual emissions for the AQRP emissions inventory from Appendix K is presented in Tables 7.e

- 1 through 7.e

- 4 of EP Revision 2.

30 CFR 550.218(a)( 1)(iii) requires that “ emissions over the duration of the proposed exploration
activities ” be included under the EP. As previously mentioned, Shell estimates it will require three yearsRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 7

- 2 March 2015
Revision 2 to complete the six wells described and the annual/seasonal emissions are provided in Tables 7 .e

- 1 through 7 .e

- 4 . Table 7.a

- 1 provides the emissions over the duration of the proposed exploration activities
that are scaled appropriately (three times increase) to reflect the anticipated project duration total
emissions. The A QRP emissions inventory detailed in Appendix K and summarized in Tables 7 .e

- 1 through 7 .e

- 4 represents a conservative assessment of Discoverer, Polar Pioneer and support vessels emissions in any year.

At this time, Shell cannot distinguish between activ ities (and air emissions) in one year versus those in other years. Consequently, Shell has estimate d “Project Duration Total” emissions by assuming the same conservative representation of emissions for each of the three seasons.

Table 7. a
- 1 3

- Year Project Duration Emissions (tons ) 1

Parameter Discoverer Discoverer and Support Vessels Polar Pioneer Polar Pioneer and Support Vessels

Carbon Monoxide (CO) 300 1,109 227 1,166 Total Suspended Particulate (TSP) (particulate matter less than 2.5
microns [PM 2.5 ] & particulate
matter less than 10 microns [PM 10 ]) 47 222 74 238

sulfur dioxide (SO 2 ) 8 33 8 31

nitrogen oxide (NOx) 1,183 4,460 1,444 4,838

volatile organic compound (VOC) 67 258 71 274

1 Aggregate emissions are based on rounded annual emissions.
Shell presents a conservative depiction of emissions for the purpose of demonstrating its exemption from the AQRP (i.e., the emissions presented overstate what is expected to occur during normal operations). This

co nservative approach is required by 30 CFR 550.218(a)(3), which requires Shell to base the projected emissions on the maximum rated capacity of the equipment on the proposed drilling units under its physical and operational design s . For example, the AQRP an alysis assumes all emission units are operating at the same time every hour of the season

, which will not occur during normal operation . Further, this analysis

, includ es the Discoverer propulsion engine even though actual operation of the propulsion engine will be
minimal (if it operates at all) while the drilling unit is completely anchored

. Section 2.3 of Appendix K provides additional background on the conservative assumptions applied in the AQRP emissions summary.

Appendix K discusses the activity of various emissions units as required by 30 CFR 550.218(a)( 1)(iv). As further discussed in Appendix K, diesel

- fueled engines are the primary source of emissions associated with the exploration drilling activity. Analogous to how automobiles are driven, diesel engines are not expected to continuously operate at max imum rated power during the proposed exploration activity. In calculating emissions for this exemption analysis, Shell conservatively assumed the engines on the Discoverer and
Polar Pioneer were operating at maximum load, 100 percent of the season. In the se calculations, maximum load is based on engine nameplate rating, modified by operational limitations established from a combination of safety policies and good engine care policies. Such “good engine care policies ” are implemented by vessel owners and operators to extend equipment life. In practice, maximum continuous power ratings of marine engines are typically 10 to 20 percent below “name

- plate” power ratings

. Thus, i n calculating emissions for this exemption analysis , the maximum operating rate for each engine is limited to 80 percent of the name

- plate rating

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 7

- 3 March 2015
Revision 2 When calculating emissions from engines of the support vessels in order to determine cumulative emissions, Shell included fuel restrictions on most of the propulsion and generator engines. For those support vessel engines not subject to a fuel restriction, emissions were based on c ontinuous operation all season. As discussed in Appendix K, emissions from the smaller engines are based on the same 80 percent power operating assumptio n applied to the drilling rig engines.

Maximum projected uncontrolled emissions are compared to AQRP exemption formula criteria under
Tables 7.e

- 1 through 7.e

- 4

.

b) Emission Reduction Measures

Shell employs emission reduction measures on the Discoverer

, Polar Pioneer , and on some of the support vessels that are candidates for use with the drilling units in the Chukchi Sea. These emission reduction measures include the following:

• Procuring ultra

- low sulfur diesel (ULSD) fuel or a fuel with equal or lower sulfur content to reduce SO 2 emissions for each of the drilling units and all vessels operating as part of the exploration drilling

program ; and

• Establishing fuel restrictions on most of the propulsion and generators engines for the support vessels.

Appendix K provides a summary of the emission reduction measure s and resulting emissions reductions, as applied in the AQRP analysis. Shell will monitor compliance by obtaining certification documentation of fuel sulfur content from fuel terminals and suppliers upon each fueling and by measuring annual fuel consumption of the support vessels with fuel restrictions

. Shell has elected to present maximum projected emissions in the AQRP emissions inventory for the 30 CFR 550.303(d) exemption formula analys e s without consideration of existing emission controls on the

Discoverer ’s primary generation units or any of the support vessels as emission reduction measures

. These emission controls include the following:

• Use of selective catalytic reduction (SCR) emission controls to reduce NO X emissions on Discoverer ’s primary generation units and certain units on support vessels;

• Use of catalytic diesel particulate filters (CDPF) emission controls to reduce CO, particulate matter (PM), and VOC emissions on the Discoverer ’s primary generation units and certain units on support vessels; and

• Use of oxidation catalysts (OxyCat) emission controls to reduce CO, PM, and VOC emissions on certain units on support vessels.

The 30 CFR 550.303(d) exemption analyses in S ection 7(e) conservatively assume the emission controls are not employed as emission reduction measures. As a result, Shell is not required to operate these controls, but
is vo luntarily committing to do so. Therefore, emissions reductions resulting from th e voluntary commitment to operate the controls are not quantified in the AQRP emission inventories presented in Appendix K and thus no corresponding monitoring is proposed for these emission controls

.

c) Processes, Equipment, Fuels, and Combustibles

The Discoverer and Polar Pioneer engines generate electrical, compressed air, and hydraulic energy for drilling operation s . All other processes are secondary and related to general purpose heating (using boilers), transfer of materials about the deck (usin g cranes), pumping of cement, and incineration (primarily domestic waste). All engines on the Discoverer, Polar Pioneer and support vessels will be powered by a fuel purchased with sulfur content at or below 15 ppm . Additional descriptions of these

process es and emissions units are provided in Appendix K

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 7

- 4 March 2015
Revision 2 d) Distance to Shore

The minimum distance from a drill site to the shoreline is 64 .7 mi ( 104 km).

e) Impact from Non

- Exempt Drilling Units

As required by 30 CFR 550.218(e), Table 7.e

- 1 compares projected annual emissions from the Discoverer with the exemption criteria at 30 CFR 550.303(d). The comparison confirms the exploration program is
exempt from further air quality review

, pursuant to 30 CFR 550.303(d).

Table 7.e

- 1 Application of BOEM Exemption Formula to the Discoverer

Parameter BO EM formula at 30 CFR 250.303(d) 1 BOEM Exemption
Threshold (Emissions in

tons/year) Total Projected Drilling Unit
Emissions Discoverer (tons/year) 2 Exempt?

CO E=3400D 2/3 54,796 100 Yes TSP (PM 2.5 & PM 10 ) E=33.3D 2,155 16 Yes
SO 2 E=33.3D 2,155 3 Yes
NOx E=33.3D 2,155 394 Yes
VOC E=33.3D 2,155 22 Yes

1 D=distance from the closest of the six candidate drill sites to the nearest point of land (Icy Cape) in statute miles (64.7 mi [104 km])

2 As provided in Appendix K.

Table 7.e

- 2 compares projected annual emissions from the Discoverer and its support vess els with the exemption criteria at 30 CFR 550.303(d). The comparison confirms the exploration program even with projected support vessel emissions included , is exempt from further air quality review

, pursuant to 30 CFR 550.303(d).

Table 7.e

- 2 Application of BOEM Exemption Formula to the Discoverer and Support Vessels

Parameter BOEM formula at 30
CFR 250 .303(d) 1 BOEM Exemption
Threshold (Emissions in

tons/year) Total Projected
Emissions Discoverer and Support Vessels (tons/year) 2 Exempt?

CO E=3400D 2/3 54,796 370 Yes TSP (PM 2.5 & PM 10 ) E=33.3D 2,155 74 Yes
SO 2 E=33.3D 2,155 11 Yes
NOx E=33.3D 2,155 1,487 Yes
VOC E=33.3D 2,155 86 Yes

1 D=distance from the closest of the six candidate drill sites to the nearest point of land (Icy Cape) in statute miles (64.7 mi [104 km])

2 As provided in Appendix K.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 7

- 5 March 2015
Revision 2 Table 7.e

- 3 compares projected annual emissions from the Polar Pioneer with the exemption criteria at 30 CFR 550.303(d). The comparison confirms the exploration program is exempt from further air quality
review

, pursuant to 30 CFR 550.303(d).

Table 7.e

- 3 Application of BOEM Exemption Formula to the Polar P ioneer

Parameter BOEM formula at 30 CFR 250.303(d) 1 BOEM Exemption
Threshold (Emissions in

tons/year) Total Projected Drilling Unit
Emissions Polar
Pioneer (tons/year) 2 Exempt?

CO E=3400D 2/3 54,796 76 Yes TSP (PM 2.5 & PM 10 ) E=33.3D 2,155 25 Yes
SO 2 E=33.3D 2,155 3 Yes
NOx E=33.3D 2,155 481 Yes
VOC E=33.3D 2,155 24 Yes

1 D=distance from the closest of the six candidate drill sites to the nearest point of land (Icy Cape) in statute miles (64.7 mi [104 km])

2 As provided in Appendix K.

Table 7.e

- 4 compares projected annual emissions from the Polar Pioneer and its support vessels with the exemption criteria at 30 CFR 550.303(d). The comparison confirms the exploration program even with projected support vessel emissions include d

, is exempt from further air quality review

, pursuant to 30 CFR 550.303(d).

Table 7.e

- 4 Application of BOEM Exemption Formula to the Polar Pioneer and Support Vessels

Parameter BOEM formula at 30 CFR 250.303(d) 1 BOEM Exemption
Threshold (Emissions in

tons/year) Total Projected
Emissions
Polar Pioneer and

Support Vessels

(tons/year) 2 Exempt?

CO E=3400D 2/3 54,796 389 Yes TSP (PM 2.5 & PM 10 ) E=33.3D 2,155 79 Yes
SO 2 E=33.3D 2,155 10 Yes
NOx E=33.3D 2,155 1,613 Yes
VOC E=33.3D 2,155 91 Yes

1 D=distance from the closest of the six candidate drill sites to the nearest point of land (Icy Cape) in statute miles (64.7 mi [104 km]) Cape) in

statute miles (64.7 mi [103 km])

2 As provided in Appendix K.

f) Modeling Report

According to 30 CFR 550.218(f), results of the modeling and impact analysis are required to be included only if 30 CFR 550.303 requires the use of an approved air quality model to model projected air emissions in developing EP Revision 2. As discussed in t he previous section, the exploration drilling

program is exempt from further air quality review using the exemption formula found at 30 CFR 550.303(d) ; therefore, an impact analysis and use of an approved air quality model is not required under the AQRP.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 8

- 1 March 2015
Revision 2 

## SECTION 8.0 OIL AND HAZARDOUS SU BSTANCES SPILL
INFORMATION

a) Oil Spill Response Planning

Shell prepared a Chukchi Sea Regional Exploration Program OSRP as a fundamental component of the planned exploration drilling program wh en it submitted EP Revision 1. BSEE approved that Chukchi Sea
OSRP 17 February 2012. As per 30 CFR 254.30(a) Shell conducted a biennial review of the Chukchi Sea
OSRP and submitted to BSEE administrative changes to the Chukchi Sea OSRP on 18 December 2013

. In June 2014, BSEE confirmed that the OSRP is in compliance with 30 CFR 250.30(a). Shell will submit
to BSEE a dditional administrative changes to the approved OSRP to reflect add itional operational changes consistent with EP Revision 2. Th e se additional administrative changes will reflect the change of a second drilling unit ( the Kulluk will not be drilling in the Beaufort Sea but the Polar Pioneer will be drilling near the Discov erer on the Burger Prospect ), change in name of an OSR contractor, and other administrative changes.

Despite the very low likelihood of a large oil spill event, Shell has designed a response program based upon a regional capability of responding to a range of spill volumes, from small operational spills up to and including an OSRP WCD for planning purposes from an exploration well blowout. Shell’s program is developed to fully satisfy federal oil spill planning requirements

. The OSRP presents specific infor mation on the response program that includes a description of personnel and equipment mobilization, the incident management team organization, and the strategies and tactics used to implement effective and sustained spill containment and recovery operation s.
Shell is committed to conducting safe and environmentally responsible operations in the Chukchi Sea. To achieve this goal, oil spill prevention is a priority in all operations. Prevention practices include personnel training programs and strict adherenc e to procedures and management practices. All project personnel, including employees and contractors, involved in oil spill contingency response would receive discharge prevention and response training as described in the OSRP. Training drills also would b e conducted periodically to familiarize personnel with on

- site equipment, proper deployment techniques, and maintenance procedures.

b) Location of Primary Oil Spill Equipment Base and Staging Area

One dedicated OSR barge and on

- site oil spill response vessel ( OSR V ) will be staged in the vicinity of the drilling unit(s) when drilling into potential liquid hydrocarbon bearing zones. The OSR V will be positioned within 10 n mi (19 km, approximately 1 hour transit time) of the drilling unit (s) and an OSR tug and barge will be positioned approximately 25 n mi (46 km) from the drilling unit( s ) (approx imately 3 hours transit time). The OSR barge, associated tu g, and OSRV possess, in total, greater than 25,000 bbl capacity ; therefore providing containment, recove ry and storage for the initial 24 hours until an OST
arrives.

An OST will be staged such that it will arrive at the recovery site on the Burger Prospect within 24 hours of depart ure from its staging location. Response personnel will conduct maintenance, training and other activities to ensure continued readiness in the event they are need e d. The OST will possess enough storage capacity to store all recovered liquids (oil and emulsified oil/water) for the initial response or until the second relief OST arrives to supplement the response for the full 30 days. The total storage capacity
betwe en the two tankers available for the 30 day response is > 750,000 bbl

. By hour 42, two additional
dedicated Vessel s of Opportunity Skimming Systems would arrive at the spill site to support skimming capacity at the site. The OSR tug and barge

, OSRV, and vessels would work in conjunction to sustain containment and skimming operations and transfer recovered fluids to the OSTs for the duration of the

response.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 8

- 2 March 2015
Revision 2 An additional ice

- strengthened OSR tug and barge with skimming capability, and an associated tug, will
be mobilized from its staging location near Kotzebue Sound and re

- located to the nearshore zone of the Chukchi Sea within 96 hours for shoreline protection and cleanup support, if necessary. It will be mobilized to arrive prior to the earliest p rojected time oil could arrive in the Chukchi nearshore zone. The
OSR tug and barge would possess storage capacity of 17,000 bbl for recovered liquids. It will also carry response equipment, including one 47 ft. (14 m) skimming vessel, 34 ft. (10 m) workbo ats, mini

- barges, boom and duplex skimming units for nearshore recovery and possibly support nearshore protection. The
OSR tug and barge

, will carry designated response personnel and will mobilize to recovery areas, deploy equipment and begin operations.

c) N ame(s) of Spill Removal Organization(s) for Both Equipment and Personnel

Shell ’s OSRP is supported by three Oil Spill Removal Organizations (OSROs). AES

- Respon s e Operations, UIC

- Arctic Response Services and Alaska Clean Seas (ACS) are Shell’s primary respo nse action contractors supporting the program. The OSROs would lead the spill response efforts in the offshore, nearshore , and shoreline environments. The OSROs response personnel and OSR equipment would be maintained on standby while critical exploration drilling operations into liquid hydrocarbon bearing zones are underway and provide offshore, nearshore, and shoreline response operations in the unlikely event of an actual oil spill incident. Additionally, each OSRO provides program oversight for
their particular scope, overall spill management team support, response training, and additional responders through the Au xiliary Contract Response Teams

, North Slope Spill Response Team, and Village Response Teams

. Shell provides dedicated response vessels, ski mmers, and equipment for the nearshore and offshore operations. Response activities will be conducted using the Shell or ACS tactics as defined in the Shell’s Beaufort and Chukchi Seas Regional Tactics Manual and/or ACS’ Technical Manual , or otherwise as
defined in the OSRP

.

d) Calculated Volume of Worst Case Discharge Scenario

The planning volume (25,000 bbl/day) of a WCD scenario for the Chukchi OSRP is provided in Table
8.d

- 1. The WCD planning volume for EP R evision 2 has not changed from the WCD planning volume
used for EP Revision 1.

Table 8

. d

- 1 Oil Volume of the Worst Case Discharge Planning Scenario * for the Chukchi Sea
OSRP

Element Capacity (bbl ) Reference
Possible Daily Volume of Highest Capacity Well 25,000 30 CFR 254.47(b)

Total Worst Case Discharge (Daily
Volume X 30

- day Duration of Blowout) 750,000 30 CFR 254.47(b)

Total Storage Capacity Requirements 750,000 30 CFR 254.47(b)

* WCD scenario planning volume, which exceeds the calculated WCD volume established under BOEM NTL No. 2015

- N01

. The calculated daily WCD is established for Burger J at 23,100 bbl/day initially but diminishes over the 30 days.

The WCD planning scenario provided above in Table 8.d

- 1 exceeds the WCD calculated for EP Revision
2 as i ndicated in Table 8.d

- 2.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 8

- 3 March 2015
Revision 2 Table 8.d

- 2 Comparison of the WCD Planning Scenario Developed for the Chukchi Sea Regional O SR P with the WCD Calculated for EP Revision 2 for Two Relief Well
Scenarios

O SR P WCD Planning Scenario EP Revision 2 Calculated
WCD

– Two Drilling Units
in the Chukchi Sea EP Revision 2 Calculated
WCD

– One Drilling Unit as far away as Dutch Harbor
Maximum Flow

Rate 25,000 bbl 23,100 bbl 1 23,100 bbl 1

Total Duration 30 days 34 days 38 days

Total Oil Volume 750,000 bbl 603,564 bbl 669,479 bbl

1 Calculated WCD for Burger J; flow rate diminishes over time

e) Description of Worst Case Discharge Scenario

For exploration drilling operations, the WCD scenario is equal to the daily volume possible from an uncontrolled blowout for period of 30 days. In order to address BOEM NTL 2015

- N01 and 30 CFR 254.47, the total WCD planning volume was based upon BSEE’s planning requirement for a 30

- day blowout, and the Chukchi Sea OSRP assumes as a planning standard a maximum flow rate of 25,000 bbl/day resulting in a WCD scenario volume of 750,000 b bl (119,237 m 3 ) of oil during 30 days. This is
the same conservative planning standard volume as assum ed in EP Revision 1.

f) Modeling Report

The WCD scenario is based upon a spill simulation model of a 25,000 b pd well blowout at the seafloor (or mudline) in the Burger Prospect at Latitude 71 ° 16’ 37.2”, Longitude 163 ° 19’ 48.0”, the site of the legacy Burger #1 well , in approximately 138

- 144 ft. (42

- 44 m) of water. Modeling of the oil plume trajectory was conducted by Applied Science Associates, Inc. (ASA), u sing historical wind data and the
BOEM hydrodynamic ocean

- ice current model. The ASA trajectory model includes algorithms for spreading, evaporation, emulsification, and entrainment, all of which are input parameters based on the properties of an Alaska No rth Slope crude oil with an American Petroleum Institute ( API ) gravity of
30.6°.

The ASA’s OILMAP software was used to run the trajectory model based on environmental conditions including predominate winds and currents. Oil on the ocean’s surface is assumed to move as the sum of vectors: surface currents plus 3.5 percent of the wind speed in the downwind direction. Oil plume migration is driven by ocean currents and prevailing winds for the 30

- day duration of this scenar io. Wind data used for the trajectory modeling were collected by Shell from 22 locations in the Chukchi Sea during June through November for the years 1980, 1982, and 1983. Data from these three years were used for stochastic modeling. Wind data for the period of 7 August to 6 September was use d in the trajectory modeling.

Based upon the collected data, the offshore winds originated from the northeast to southeast 54 percent of the time and the northwest to southwest 23 percent of the time during the June through November period. Three predominant wind directions had a measured frequency of occurrence greater than 10 percent of the time originating from the northeast (NE), east

- northeast (ENE) and east (E) based upon the 16 cardinal compass directions. The se three wind directions on average occurred at the following frequencies for the June through November period:

• ENE wind = 14.6 percent frequency

• NE wind = 13.8 percent frequency

• E wind = 13.0 percent frequencyRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 8

- 4 March 2015
Revision 2 The trajectory simulation uses a SS blowout rising through the water column and surfacing above the well location. The trajectory simulation moves and spreads the oil under the influence of local winds measured
at the closest station for the 7 August to 6 September time period and the BOEM ocean

- cu rrent information.

The trajectory shows the oil plume moving into open ocean away from shorelines in a southwesterly
direction. From Day 1 through Day 3, the oil movement is directed by winds predominantly from th e NE and the predicted current. Through Day 12, the oil movement is away from land into the open ocean. If not intercepted by containment and recovery operations, oil is predicted to begin drifting to the north

northeast (NNE) an d toward shorelines by Day 14. The earliest oil is predict ed to possibly contact shorelines is Day 25 in the area between Peard Bay and K asegaluk Lagoon. Following Day 25, unrecovered oil would continue drifting to the N E, offshore and north of land.

In the very unlikely event that strong, sustained winds develop out of the west

- northwest ( WNW ) , the trajectory modeling estimates that Day 6 is the earliest possi ble time oil could reach shore. For planning response mobilization, the WCD scenario assumes oil could intercept the shoreline in no less than six days in t he event sustained northwesterly winds develop, potentially affecting the shorelines from Peard Bay to Kaseg aluk Lagoon, SW of Wainwright. The WNW wind is used for planning purposes and does not correspond to the actual prevailing E, NE, and ENE winds typi cal in the area. As a precaution, Shell response would include nearshore and shoreline protection strategy and tactics, and OSROs would be mobilized to implement predesigned protection strateg ies at priority resource sites.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 9

- 1 March 2015
Revision 2 

## SECTION 9.0 ALASKA OUTER CONTINENTAL SH ELF
PLANNING INFORMATION

a) Emergency Plan

Shell has drafted various plans to respond to emergency situations such as a blowout (well control event), the loss or disablement of a drilling unit, and the loss or damage to a support vessel.

Shell ’s WCP describes how Shell would respond to a well control event

. ( Appendix H ) . The WCP is focused on the prevention of a blowout using pressure control equipment and operational monitoring. Well control is the process of maintaining barriers in the drilled wellbore that prevent gas or fluids from underground reservoirs escaping from the wellbore in an uncontrolled flow.

The WCP describes measures to control the flow of a blowout including if the primary drilling unit is lost or disabled. A capping stack will be available and can be used to cap the well and stop the flow (a process called ‘cap and contain’). If the capping stack is not able to stop the flow, then a separate containment system, will be available to capture the flow and divert the recovered liquid for storage and processing (a process called ‘cap and flow’). Additional detail on the capping stack and the containment system is
availabl e in Section 9c . Also, a relief well drilling unit will be available and can be mobilized to the
blowout site to drill a relief well.
Note that the WCP attached to EP Revision 2 is worded differently from that attached to EP Revision 1. It was changed to incorporate language more familiar to Shell’s well engineers and responde r s to a well control event; however, there have been no c hanges to reduce the substance of Shell’s well control procedures.
Shell’s proposed COCP (Appendix F) describes precautionary measures to minimize the likelihood and consequence of an oil spill while drilling exploration wells in the Chukchi Sea and to protect personnel, equipment and the environment. The COCP defines planned and unplanned critical operations. In th e event that a support vessel, such as an ice management vessel, is unavailable

, drilling operations may be curtailed depending on circumstances.

b) Critical Operations and Curtailment Plan and Drilling Ice Management Plan

A copy of Shell’s proposed COCP for the Chukchi Sea is attached in Appendix F and a copy of Shell’ s D IMP is provided in Appendix G

. These plans are complementary documents that address the methods by which Shell will cease, limit, or not initiate specific critical operations d u e to operational status and
environmental conditions that may be encountered at the explorat ion drill site s

. However, the scope of the

D IMP is limited to approaching hazardous ice and its potential effects on exploration drilling operations
and the drilling unit’s safety.

The text of the COCP has been updated to include the Polar Pioneer , key personnel titles have changed, and the curtailment decision protocol has been updated to include the new key personnel.

The DIMP contains minor changes and updates from the version submitted with EP Revision 1. Ice management objectives and principles are clearly defined and the drilling units and attending ice management vessels ha ve been up dated.

c) Additional Information

Fuel Transfer Plan

Shell has prepared a Fuel Transfer Plan (FTP) that covers activities with its planned exploration drilling program in the Chukchi Sea. A copy of the FTP is provided in Appendix I

. Shell has revised the attached

FTP that was submitted to BOEM with EP R evision 1 to include a variety of boomin g scenarios depending on whether the fuel transfer is from vessel

- to

- vessel , vessel

- to

- drilling unit or dock

- to

- vessel.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 9

- 2 March 2015
Revision 2 Partial Wells

Two scenarios exist that could result in partial wells being drilled in a multi

- year exploration plan:

• Exploration d rilling and/or evaluation of the deepest primary objective has not been concluded on

a well by the end of the drilling season ; or

• A hazardous condition (e.g., ice) forces suspension of the exploration drilling operations, temporary abandonme nt of a wellbore in a safe and secure manner, and drilling unit demobilization from the Chukchi Sea with no opportunity to return before the end of the drilling

season

T he se scenarios are discussed in more detail below.

Initial Drilling Season

If exploration drilling and/or evaluation of the initial or a subs equent well has not been conclud ed (i.e

., the deepest primary objective has not been penetrated and / or evaluated), before the end of a drilling

season , Shell plans to stop the exploration drill ing operations, TA the well in compliance with BSEE regulations and leave the drill site for the winter.

O perations may begin on a dditional well s during the drilling season if there is sufficient time prior to the onset of the end of the drilling season

. This work could include MLC construction (using either a drilling
unit with a MLC bit or the MLC ROV s ystem)

, or drilling additional hole sections and cementing casing
stri ngs during the time remaining in the drilling season

.
The best way to suspend a well is to run casing, cement it in the hole, then set a mechanical plug near the top of the well and cap the well. This provides multiple barriers to prevent unexpected flows and leave the
well suitable for safe re

- entry. The proposed suspension procedure on any unfinished, or partial well, will be provided via submission of an Application for Permit to Modify ( APM ) for BSEE approval. The MLC
for each well is constructed su ch that the ram

- type BOP stack (i.e., the bottom section of the stack) can remain installed on the high

- pressure wellhead housing as part of the TA procedure with th e upper most portion below the LMRP remaining below the maximum ice keel scour depth. Efforts will be made to preferentially provide a sufficient number of independent verified barriers in the wellbore (a minimum of two) to ensure that the well cannot leak or flow while TA without the lower stack remaining on the well. These barriers can include cement not drilled out from the bottom joints of casing after cementing it in place, double float valves inside the casing, wellhead seal assembly between casing strings, cement plugs, mechanical plu gs and sealed hang

- off tools. These techniques and barriers are also described in the COCP in Appendix F. If there are a sufficient number of quality barriers left in the well when it is TA , the entire BOP stack will be recovered for repair and testing dur ing the winter season in preparation for the next drilling season.

If a hazardous condition requires curtailment of critical operations (or prevents initiation of them, depending on time available) per the provisions of the COCP (Appendix F ), the well will be suspended and secured using a BSEE approved procedure, moorings will be recovered if possible and the drill ing
unit will move to a safe area. Once the hazardous condition has passed, the drill ing unit will return to the
drill site and conclude exploration drilling operations, evaluation, permanent plugging and abandonment operations.

If, however, the hazardous condition (e.g., ice) does not permit moving back over the well, re

- mooring,

re

- entering and continuing drilling/evaluation operations before the end of any drilling season, the well
will remain TA until the next drilling season. The drill ing unit may return to the suspended well and
finish exploration drilling/evaluation operations during a subsequent drilling season prior to permanently abandoning the well.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 9

- 3 March 2015
Revision 2 Subsequent Drilling Season s
In a subsequent season, Shell may choose to return to an unfi ni shed drill site where a well has been left
TA from a previous season , o r Shell may choose to go to a new drill site covered by this EP Revision 2
and start a new well that will meet the e x ploration program objectives. Once all objectives have been satisfied, all well s will be successfully plugged and permanently aban doned according to BSEE regulations, as were the legacy wells drilled from 1989 through 1992.

All wells are planned to be temporarily or permanently abandoned in accordance with BSEE regulations during the season they are drilled

. An exception to this plan involves the inability to return to the drill site following an emergency evacuation , such as, but not limited to, an approaching ice hazard . If a well
cannot be abandoned due to ice, it will be properly suspended per BSEE approval before the drill ing unit evacuates. At the beginning of a subsequent drilling season, the drill ing unit may return to the drill site to permanently abandon the unfinished well or continue exploration drilling/evaluation of the well

. All wells will be permanently abandoned prior to the end of the exploration program.

Surface Intervention

– Capping and Con tainment System

I n the unlikely event of a blowout in the Chukchi Sea , Shell ’ s capping and containment capabilities are provided by a combination of a 1) SS capping stack and 2) surface separation equipment

, i.e. a containment system

. The c apping stack equipment will be stored aboard one of the ice management vessels and will be available for deployment within 24 hours, depending on ice, weather and location, in the unlikely event of a blowout. The containment system, located on the Arctic Challenger barge and accompanied by a tug ( Corbin Foss or similar) is planned to be stationed in Kotzebue Sound and could
arriv e at the scene of a blowout and be capable of receiving liquid hydrocarbons in eight days, depending
on weather and the characteristics of the blowout.

The capping stack will be lowered onto the BOP to shut off oil leaks in the event that the BOP fails to
shut off the flow

. The capping stack is meant to seal a leaking wellhead provided that the well’s integrity has not been compromised. It is part of the efforts to control the outflow of liquid hydrocarbons from the
well in an uncontrolled blowout but it is separate from the c ontainment s ystem

. The c ontainment s ystem is another oil spill collection system that will be available. The containment system will provide the
means to collect uncontroll ed well flows from SS blowout situations as close to the source as possible, thereby minimizing surface oil slicks

. The containment system is housed on the Arctic Challenger barge
and includes the containment dome, topside processing facilities, flare boom, an ROV, two workboats, and living quarters ( Figure 9.c

- 1 )

.
Surface intervention involves work done on the wellhead of a SS well. Surface intervention in the OCS
involves SS devices used on the top of the well or some device connected thereto (e.g., the BOP stack or wellhead).

A set of SS devices has been assembled for the drilling seasons to provide direct surface intervention capability with the following priorities:

• Attaching a device or series of devices to the well to affect a seal capable of withstanding the maximum anticipated wellhead pressure (MAWP) and closing the assembly to completely seal the well against further flows ( this intervention process is commonly called “ Cap and Contain ”)

• Attaching a device or series of devices to the well and diverting flow to surface vessel(s) equipped for separation and disposal of hydrocarbons ( this intervention process is commonly called “ Cap and
Flow ”)Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 9

- 4 March 2015
Revision 2 These devices form what is generally known as a capping stack. The device s on the capping stack include

ram

- type BOP bodies equipped with blind rams , spacer spools, flow crosses (or mud crosses) for pumping kill weight fluid into the well or for flowing the well in a controlled manner through piping to
the surfac e and connectors to attach to the upper H4 connector mandrel, the high

- pressure wellhead housing if the entire BOP stack has been removed

. This equipment will be stored aboard a designated vessel in Alaska with a marine crew aboard, warm

stored and ready f or use. It is anticipated that surface intervention efforts will successfully stop the flow
from a blowout

.
Various crossovers

, spools

, ram sets

, and other equipment (including demolition tools for clearing debris away from the well) are included on the designated vessel. Extra studs, nuts, gaskets, hydraulic wrenches
and other tools are available to allow the capping stack to be modified aboard th e vessel as necessary to provide flexibility to deal with a wide variety of capping situations.

The equipment on the containment system tug s and barge is designed for reliability, ease of operation, flexibility and robustness so it could be used for a vari ety of blowout situations.

Efforts to contain the blowout will begin when the equipment arrives to clear debris from the well and a capping stack will be attached as necessary. If these efforts fail to capture all the oil, Shell’s O SR support vessels will still be available at the blowout well site to collect and recover fugitiv e oil emissions from the surface. This equipment will be positioned downwind and down current from the blowout well and will not interfere with either containment efforts or relief well drilling. Containment efforts will continue during relief well drillin g operations unless it is unsafe or futile to do so. The surface OSR vessels would remain and oil spill cleanup would continue, as necessary, until the blowout is under control.

Figure 9

. c
- 1 Containment System and ComponentsRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 10

- 1 March 2015
Revision 2 

## SECTION 10.0 ENVIRONMENTAL MONITO RING

a) Monitoring Systems

The drilling units will be equipped with the following equipment (or similar, but of equal or superior specifications) used to monitor conditions at the location of either drilling unit :

Table 1 0. a
- 1 Monitoring Equipment on the Polar Pioneer and the Discoverer

Equipment Polar Pioneer Discoverer

Navigation Radar Furuno FAR

- 2127BB Furuno ARPA FAR

- 28 X 7 SERIES;
Furuno FAR

- 21 X 7 (

- BB) SERIES

Communications very high frequency

– amplitude
modulation ( VHF

- AM ) aeronautical radio
Aeronautical non

- directional beacon Sailor, Compact

- GMDSS station

V

- SAT, phone/fax/data
Iridium Scanset

- 7701 satellite phone GMDSS EQUIPMENT
Sailor HC 4500 MF / HF control units System 4000 GMDSS
Sailor HF SSB 250W PEP
Thrane & Thrane TT

- 3020C / TT

- 3022D Capsat Transceiver JMC Dual Frequency Navtex Receiver
Model NT

– 1800
Satellite Phone Sailor TT3622B

Positioning Kongsberg K

- Pos DPM 11

– Positioning mooring system Kongsbe r g Simrad HPR 309
Furuno GPS/WAAS Navi gator GP32 Furuno GPS Navigator GP

– 150
AIS L3 Communications
Simrad GL 80 / 85
Furuno FE 700 echo sounder Cassen & Plath GmbH Type 12 Reflector

compass Standard clinometer model MOELLER 5 / 15 degs

Anchor Tensions APM 3000 (SIMRAD/ Kongsberg Albatross) computer system for indications of tensions and alarm at specified levels Plimsoll Anchor tension monitoring system

Meteorological Meteorology instruments installed in compliance with all relevant requirements (E nvironmental M anagement S ystem ) ; measurin g wind, barometric pressure, water
temp erature Young Marine Wind Tracker model 06206 Sato Sigma

- II Barograph model NS II

– BR
Barometer Hanseatic Instruments
Laser mounted flute to measure seawater inlet temperatureRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 10

- 2 March 2015
Revision 2 Environmental Monitoring at Drill Sites While Drilling

As part of the requirements under the NPDES exploration facilities GP , Shell will conduct an Environmental Monitoring Program (EMP) that meet s the objectives in the permit AKG

- 28

- 8100. The specific details around this monitoring program have been submitted with the NPDES NOI; however, the EMP will generally consist of a 4 phase monitoring program.

• Phase I establishes the baseline conditions of the drill site prior to exploration drilling activities and
will either be s upported with historical data or supplemental data collected prior to exploration drilling activities. The baseline data generally consist of benthic samples, receiving water chemistry, sediment characteristics, and a visual assessment of the sea floor.

• Phase II requires monitoring to be conducted while exploration drilling activities are occurring and consists of discharge plume monitoring, metals analysis of the drilling fluid, and Phases III and IV are
similar in nature and are conducted once explorati on drilling activities are completed. Phase III monitoring will occur shortly after exploration drilling operations cease at a drill site

. Phase IV is
conducted no later than 15 months after exploration drilling operations cease. Benthic samples,
sediment characteristics, and a sea bottom survey will be completed during these phases.

The results from this monitoring program will be submitted to EPA as required in permit AKG

- 28

- 8100.

Bird and mammal observations will be made from all transiting surface opera tion vessels throughout explora ti on drilling activit ies in accordance with the Marine Mammal Monitoring and Mitigation Plan (4MP) located in Appendix B and the Bird Strike Avoidance and Lighting Plan located in Appendix E.

b) Incidental Takes

Applications have be en submitted for the following MMPA authorizations:

• NMFS

– Non

- lethal, Incidental Take of Whales and Seals

• USFWS

– Non

- lethal, Incidental Take of Polar Bear s and Pacific Walrus

• USFWS

– Non

- lethal, Intentional Take of Polar Bear s and Pacific Walrus

During the planned exploration drilling program, the two drilling units and transiting support vessels will
each have PSOs onboard to observe for marine mammals and record all observations. The PSO program
is described in the 4MP (Appendix B) submitted in support of the NMFS and USFWS MMPA non

- lethal,
incidental take authorization application s

. Species for which a MMPA authorization is sought from NMFS are:

• Mysticetes: bowhead, fin, gray, humpback and minke whales

• Odontocetes: beluga, narwhal, killer whale, and harbor porpoise

• Pinnipeds : bearded, ribbon, ringed, and spotted seals

Table 12.b

- 2 lists these species and provides the current ESA designation.

Under current guidelines, NMFS assumes that marine mammals exposed to pulsed airgun sounds with

received levels ≥ 160 decibels (dB) root mean square (rms) or continuous sounds from vessel activities with received levels ≥120 dB rms have the potential to be disturbed. As a result, these sound level thresholds are currently used by NMFS to define acoustic disturbance cr iteria, also known as the Level B
thresholds. Shell plans to conduct a geo physical survey with airguns referred to as a zero

- offset vertical seismic profile (ZVSP) survey at each drill site where a well is drilled to PTD. The numbers of marine
mammals th at may potentially be exposed to pulsed sound levels of > 160 dB (rms) while conducting
ZVSP s urveys , and continuous sound levels > 120 dB rms during exploration drilling, ice management,Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 10

- 3 March 2015
Revision 2 anchor handling, MLC construction, and supply vessels using dynamic po sitioning in a drilling season are summarized in Table 10.b

- 1. Shell recognized that NMFS has recently issued draft acoustic guidance (NMFS, 2013) for all sound sources which are specific for the onset of Temporary Threshold Shift which
is consid ered Level B harassment and Permanent Threshold Shift which is considered Level A
harassment. The criteria for Level B behavioral disturbance have not been developed. Until such time as the acoustic criteria are finalized and released, Shell will utilize the current threshold criteria.

The estimates shown in Table 10.b

- 1 reflect the results of a multistep process for calculating the exposure
of animals to Level B thresholds. The first of these steps estimates the number of marine mammals that may be present in areas exposed to Level B thresholds for a range of activity scenarios and sums them together. Estimates from this method do not account f or animal avoidance, movements into or out of exposed areas, or new animals moving through (i.e., turnover) that might occur during the course of each season. The second step for estimating exposures produces conservative estimates and takes into account

a ssumptions of turnover rates of animals in the project area and avoidance rates. For all species except bowhead whales, it is assumed that there is 100% replacement of individual marine mammals with zero avoidance every 24 hours. This is likely to overesti mate exposure in most cases, resulting in over estimation of the number of individuals that would actually be exposed to Level B thresholds. For bowhead whales, we conservatively assum e d that zero whale s will avoid the area ensonified by drilling program sounds in excess of 120 dB and also assumed a 48 hour turnover rate.

The results are exposure estimates that are larger th a n prior years, but as stated are considered an overestimate. Though the aggregate activity level will increase from 2012, the resulting impacts to the
affected marine mammal population s , as described in the EIA (Appendix C)

, would be temporary and result in only short

- term disturbance or displacement. From a historical perspective, the temporary activity of offshore exploration drilling and associated support vess el activities, collectively and individually, have not resulted in impacts of biological significance to marine mammals of the Arctic, or interference with the subsistence harvest of those marine mammals by the residents of the communities along the Beaufo rt and Chukchi Seas.

Many animals exposed to continuous sound levels near 120 dB rms would not react, particularly pinnipeds, and exposure to this sound level should not be considered as “takes by harassment” in such cases. Even for species that may chang e their behavior or alter their migration route, those changes are likely to be within the normal range of activities for the animals and may not rise to the level of “taking”
ba sed on prior decisions by NMFS

. See 77 Fed. Reg. 27283, 27290 May 9, 2012. In regard to the subsistence harvest of bowhead whale, as a consequence of Shell’s planned mitigation measures (see Section 12.0) any effects on the bowhead whale as a subsis tence res ource also will be negligible.

Species for which MMPA incidental and intentional take authorization s are sought from USFWS are:

• Carnivora

– Polar bears

• Pinniped ia

– Pacific walrus

Table 12.b

- 2 lists these species and provides the current ESA designation.

The MMPA application s provides an outline of the planned exploration drilling program and includes an updated, drilling program

- specific bear and walrus plan titled: Polar Bear, Pacific Walrus and Grizzly
Bear Avoidance and Encounter/In teraction Plan, Chukchi Sea, Alaska, Exploration Drilling Program.

Shell is currently in discussion with USFWS with respect to the approach to operations that may occur in and around the HSWUA during and related to drilling activities. The details of the monitoring and mitigation measures that are to be utilized in relation to the HSWUA will be fully documented in the
MMPA authorization

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 10

- 4 March 2015
Revision 2 Table 10.b

- 1 Number of Potential Exposures of Marine Mammal s to Received Sound Levels in the
Water of >120 dB re 1 μPa rms Generated by Exploration Drilling and >160 dB re 1 μPa rms Generated by ZVSPs during 2015 Exploration Drilling

Species Number of Individuals Potentially Exposed to
Continuous Sounds ≥120

dB re 1 μPa (rms) or
Pulsed Sounds ≥1 6 0 dB

re 1 μPa (rms) Percent of Estimated Population

Odontocetes

Monodontidae Beluga 974 2.3

Narwhal 1 0.0
Delphinidae

Killer whale 14 0.7

Phocoenidae Harbor porpoise 294 0.6

Mysticetes

Bowhead whale 2,582 13.2

Fin whale 14 0.8 Gray whale 2,581 13.5 Humpback whale 14 0.1

Minke whale 41 5.1

Pinnipeds

Bearded seal 1,722 1.1

Ribbon seal 96 0.2 Ringed seal 50,433 16.8 Spotted seal 1,007 0.7Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 1 March 2015
Revision 2 

## SECTION 11.0 LEASE STIPULATIONS I NFORMATION

T he source for the italicized text below is the OCS Chukchi Sea Planning Area Oil and Gas Lease Sale
193.

Stipulation No. 1

- Protection of Biological Resources

If previously unidentified biological populations or habitats that may require additional protection are identified in the lease area by the Regional Supervisor, Field Operations (RS/FO), the RS/FO may require the lessee to conduct biological surveys to de termine the extent and composition of such biological populations or habitats. The RS/FO shall give written notification to the lessee of the RS/FO’s decision to require such surveys.

Based on any surveys that the RS/FO may require of the lessee or on oth er information available to the RS/FO on special biological resources, the RS/FO may require the lessee to:

1) Relocate the site of operations;

2) Establish to the satisfaction of the RS/FO, on the basis of a site

- specific survey, either that such operations wil l not have a significant adverse effect upon the resource identified or that a special biological resource does not exist;

3) Operate during those periods of time, as established by the RS/FO, that do not adversely affect the biological resources; and/or

4) Modi fy operations to ensure that significant biological populations or habitats deserving protection are not adversely affected.

If any area of biological significance should be discovered during the conduct of any operations on the lease, the lessee shall imm ediately report such findings to the RS/FO and make every reasonable effort to preserve and protect the biological resource from damage until the RS/FO has given the lessee direction with respect to its protection.

The lessee shall submit all data obtained in the course of biological surveys to the RS/FO with the locational information for drilling or other activity. The lessee may take no action that might affect the biological populations or habitats surveyed until the RS/FO provides written directions to the lessee with regard to permissible actions.

Shell Proposed Actions :

The BOEM has not requested that Shell conduct any biological resource surveys in the area of the planned drill s ites. No new areas of special biological significance have been i dentifi ed within or near the
blocks identified in th is EP Revision 2

.
In addition to the shallow hazard s surveys, which provide detailed information on the seafloor sediments and relief, Shell conducted or participated in the funding or in the facilitation of several types of environmental studies in and near the prospects in 2008 through 2014 to gather baseline data regarding resources. These studies included coastline surveys to assess the relative environmental sensitivity of Chukchi Sea coastline segments, walrus tagging and monitoring studies, seal tagging and monitoring studies, bird and marine mam mal surveys, assessments of the benthic invertebrate communities, oceanographic studies, and sediment quality assessments at the planned drill sites. The results of the
marine mammal and bird surveys are summarized in the EIA in Appendix C

.
These studies a lso indicated that there are no new areas of special biological significance in the vicinity of the drill sites. Video reconnaissance surveys were conducted at historical drill sites at Burger in 1989, and
the results were submitted to BOEM at that time . These surveys also found a relatively flat and featurelessRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

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Revision 2 seafloor

, with a silty substrate and a benthic fauna typical of the L ease Sale 193 Area (Finney 1989,
Boudreau 1989).

Stipulation No. 2

- Orientation Program

The lessee shall include in any exploration plan (EP) or development and production plan (DPP)
submitted under 30 CFR 550 .211 and 550 .241 a proposed orientation program for all personnel involved in exploration or development and production activities (inc luding personnel of the lessee’s agents, contractors, and subcontractors) for review and approval by the RS/FO. The program shall be designed in sufficient detail to inform individuals working on the project of specific types of environmental, social,
and cultural concerns that relate to the sale and adjacent areas. The program shall address the importance of not disturbing archaeological and biological resources and habitats, including endangered species, fisheries, bird colonies, and marine mammals and pr ovide guidance on how to avoid disturbance. This guidance will include the production and distribution of information cards on endangered and/or threatened species in the sale area. The program shall be designed to increase the sensitivity and understandin g of personnel to community values, customs, and lifestyles in areas in which such personnel will be operating. The orientation program shall also include information concerning avoidance of conflicts with subsistence activities and pertinent mitigation.

T

he program shall be attended at least once a year by all personnel involved in onsite exploration or development and production activities (including personnel of the lessee’s agents, contractors, and subcontractors) and all supervisory and managerial pers onnel involved in lease activities of the lessee and its agents, contractors, and subcontractors.

The lessee shall maintain a record of all personnel who attend the program onsite for so long as the site is active, not to exceed 5 years. This record shall include the name and date(s) of attendance of each
attendee.

Shell Proposed Actions

Shell has developed and is currently implementing an approved orientation program for Shell and contractor personnel involved in Shell’s Alaska Venture exploration drillin g program that was first approved by the Alaska OCS Region of the BOEM RS/FO on 15 February 2007

. An outline of the program was again submi tted to BOEM with the initial Chukchi Sea EP, and found by the BOEM RS/FO

on 7 December 2009 to satisfy the requirements of Stipulation No. 2. Shell revised t he orientation

program based on BOEM comments regarding the 2009 orientation program, and submitted the complete orientation program to BOEM for approval on 9 June 2011

. The orientation program was approved on 13
June 2012. Shell will periodically make minor changes to the orientation program content to maintain its currency (e.g., updates in safety statistics, permitting requirements ) and those changes will be rolled into

EP revision s as required. Anothe r update to the approved orientation program will be submitted to BOEM for approval prior to beginning the next drilling season. This update will be substantially the same as the current approved orientation program.

All Shell and contractor personnel invo lved in field exploration drilling activities will attend an initial training orientation for all personnel and an annual refresher for field deployed personnel. All Alaska
office

- based Shell and contractor personnel will attend the program at least once a t the time they join the team. Field deployed personnel traveling to onshore or offshore locations north of Fairbanks, Alaska will attend annual refresher training. Visitors traveling to land locations (i.e., trips performing low

- risk
activities less than three days) will receive an abbreviated fit

- for purpose orientation as related to their
visit. Contractors hired by Shell who reside in an area north of Fairbanks (i.e., a village) may receive a slightly modified version of the cultural awareness orientati on that is fit for purpose or allow comparable training (e.g., attendance at Alaska Federation of Natives convention).Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 3 March 2015
Revision 2 Shell will retain and maintain a record, for at least 2 years, of all personnel who attend the program, including relevant attendee and program information. Shell has designed a specific program that addresses environmental, social, and cultural concerns r elated to the project area. The program is designed to increase sensitivity and understanding by Shell and its contractors of community values, customs, and lifestyles in the area they will be working, and how to avoid conflicts with subsistence
activities . The program stresses the importance of not disturbing archaeological and biological resources and habitats, including endangered species, fisheries, bird colonies, and marine mammals and provides guidance on how to avoid disturbance.

Shell’s Cultural Awa reness Program addresses the following:

• Alaska Native Ethnic Breakdown

• Brief history of land claims

• Formation of regional corporations, and region within which Shell is working

• History of the North Slope

• Cultural diversity

• Comparison of cultural values Pat terns of language

• Communication skills and body language

• Guidelines on cultural artifacts

• Local community values and customs

• Whaling

Shell has developed a very robust Health, Safety, Security and Environment (HSSE) Awareness Program, of which the requirements listed in Lease Stipulation 2 are a component of this training. The following areas are highlighted to address the requ irement in Lease Stipulation 2.

• Environmental Awareness

o ESA

– Major Provisions

o Endangered and threatened species

o MMPA of 1972

o Marine mammal interactions

o Sensitive Habitats on the North Slope

o Wildlife interactions

o Prohibited activities of hunting, trapping and fishi ng

o Environmental requirements, for air, spills and waste

o Environmental training

The awareness level orientations may be given as face

- to

- face training, video and computer slides, or via computer based training. Annual refreshers will include the general co ntent noted above but adapted for those already f amiliar with basic information.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

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Revision 2 Stipulation No. 3

- Transportation of Hydrocarbons

Pipelines will be required: (a) if pipeline rights

- of

- way can be determined and obtained; (b) if laying such pipelines is technologically feasible and environmentally preferable; and (c) if, in the opinion of the lessor, pipelines can be laid without net social loss, taking into account any incremental costs of pipelines over alternative methods of transportation and any incr emental benefits in the form of increased environmental protection or reduced multiple

- use conflicts. The lessor specifically reserves the right to require that any pipeline used for transporting production to shore be placed in certain designated

manageme nt areas. In selecting the means of transportation, consideration will be given to recommendations of any Federal, State, and local governments and industry.

Following the development of sufficient pipeline capacity, no crude oil production will be transpo rted by surface vessel from offshore production sites, except in the case of an emergency. Determinations as to emergency conditions and appropriate responses to these conditions will be made by the RS/FO.

Shell Proposed Action

Not applicable to the activities described in this EP Revision 2

.

Stipulation No. 4

- Industry Site

- Specific Bowhead Whale Monitoring Program

A lessee proposing to conduct exploration operations, including ancillary seismic surveys, on a lease within the blocks identified belo w during the periods of subsistence use related to bowhead whales, beluga whales, ice seals, walrus, and polar bears will be required to conduct a site

- specific monitoring program approved by the RS/FO; unless, based on the size, timing, duration, and scop e of the proposed operations, the RS/FO, in consultation with appropriate agencies and co

- management organizations, determines that a monitoring program is not necessary. Organizations currently recognized by the National Marine Fisheries Service (NMFS) an d the U.S. Fish and Wildlife Service ( USFWS) for the co

management of the marine mammals resources are the Alaska Eskimo Whaling Commission, the Alaska Beluga Whale Committee, the Alaska Eskimo Walrus Commission, the Ice Seal Commission, and the Nanuuq Com mission. The RS/FO will provide the appropriate agencies and co

- management organizations a minimum of 30 calendar days, but no longer than 60 calendar days to review and comment on a proposed monitoring program prior to Minerals Management Service (MMS) ap proval. The monitoring program must be approved each year before exploratory drilling operations can be
commenced.

The monitoring program will be designed to assess when bowhead and beluga whales, ice seals, walrus, and polar bears are present in the vicin ity of lease operations and the extent of behavioral effects on these marine mammals due to these operations. In designing the program, the lessee must consider the potential scope and extent of effects that the type of operation could have on these marine mammals. Experiences relayed by subsistence hunters indicate that, depending on the type of operations, some whales demonstrate avoidance behavior at distances of up to 35 miles. The program must also provide for the following:

1) Recording and reporting inf ormation on sighting of the marine mammals of concern and the extent of behavioral effects due to operations;

2) Coordinating the monitoring logistics beforehand with the MMS Bowhead Whale Aerial Survey Project (BWASP) and other mandated aerial monitoring pro grams;
3) Inviting a local representative to be determined by consensus of the appropriate co

- management organizations to participate as an observer in the monitoring program;

4) Submitting daily monitoring results to the RS/FO;Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 5 March 2015
Revision 2 5) Submitting a draft report on the results of the monitoring program to the RS/FO within 90 days following the completion of the operation. The RS/FO will distribute this draft report to the appropriate agencies and co

- management organizations;

6) Allowing 30 days for independent peer review of the draft monitoring report; and

7) Submitting a final report on the results of the monitoring program to the RS/FO within 30 days after the completion of the independent peer review. The final report will include a discussion of the results of the peer re view of the draft report. The RS/FO will distribute this report to the appropriate agencies and co

- management organizations.

The RS/FO may extend the report review and submittal timelines if the RS/FO determines such an
extension is warranted to accommodat e extenuating circumstances.

The lessee will be required to fund an independent peer review of a proposed monitoring plan and the draft report on the results of the monitoring program for bowhead whales. The lessee may be required to fund an independent p eer review of a proposed monitoring plan and the draft report on the results of the monitoring program for other co

- managed marine mammal resources. This peer review will consist of independent reviewers who have knowledge and experience in statistics, mon itoring marine mammal behavior, the type and extent of the proposed operations, and an awareness of traditional knowledge. The peer reviewers will be selected by the RS/FO from experts recommended by the appropriate agencies and

co

- management resource orga nizations. The results of these peer reviews will be provided to the RS/FO for consideration in final MMS approval of the monitoring program and the final report, with copies to the appropriate agencies and co

- management organizations.

In the event the les see is seeking a Letter of Authorization (LOA) or Incidental Harassment Authorization (IHA) for incidental take from NMFS and/or US FWS, the monitoring program and review process required under the LOA or IHA may satisfy the requirements of this stipulation . The lessee must advise the RS/FO when it is seeking an LOA or IHA in lieu of meeting the requirements of this stipulation and provide the RS/FO with copies of all pertinent submittals and resulting correspondence. The RS/FO will
coordinate with the NMFS and/or USFWS and will advise the lessee if the LOA or IHA will meet these requirements.

The MMS, NMFS, and US FWS will establish procedures to coordinate results from site

- specific surveys required by this stipulation and the LOA’s or IHA’s to determine if further modification to lease operations are necessary.

This stipulation applies to the following blocks:

NR02

- 06, Chukchi Sea

6624, 6625, 6674, 6675, 6723

- 6725, 6773

- 6775, 6822, 6823, 6872

NR03

- 02, Posey

6872, 6873, 6918

- 6923, 6967

- 6973, 7016

- 7023, 7063

- 7073, 7112

- 7123

NR03

- 03, Colbert

6674, 6723, 6724, 6771

- 6774, 6820

- 6824, 6869

- 6874, 6918

- 6924, 6966

- 6974,

7015

- 7024, 7064

- 7074, 7113

- 7124

NR03

- 04, Solivik Island

6011

- 6023, 6060

- 6073, 6109

- 6122, 6157

- 6171, 6206

- 6219, 6255

- 6268, 6305

- 6317,

6354

- 6365, 6 403

- 6414, 6453

- 6462, 6502

- 6511, 6552

- 6560, 6601

- 6609, 6651

- 6658,

6701

- 6707, 6751

- 6756, 6801

- 6805, 6851

- 6854, 6901

- 6903, 6951, 6952, 7001Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 6 March 2015
Revision 2 NR03

- 05, Point Lay West

6014

- 6024, 6062

- 6073, 6111

- 6122, 6160

- 6171, 6209

- 6221, 6258

- 6269, 6307

- 6317,

6356

- 6365, 6406

- 64 14, 6455

- 6462, 6503

- 6510, 6552

- 6558, 6602

- 6606, 6652

- 6655, 6702, 6703

NR04

- 01, Hanna Shoal

6223, 6267

- 6273, 6315

- 6323, 6363

- 6373, 6411

- 6423, 6459

- 6473, 6507

- 6523,

6556

- 6573, 6605

- 6623, 6654

- 6671, 6703

- 6721, 6752

- 6771, 6801

- 6819, 6851

- 6868,

6901

- 6916, 6951

- 6964, 7001

- 7010, 7051

- 7059, 7101

- 7107

NR04

- 02, Barrow

6003

- 6022, 6052

- 6068, 6102

- 6118, 6151

- 6164, 6201

- 6214, 6251

- 6262, 6301

- 6312,

6351

- 6359, 6401

- 6409, 6451

- 6456, 6501

- 6506, 6551, 6552, 6601, 6602

NR04

- 03, Wainwright

6002

- 6006, 6052, 6053

NS04

- 08, (Unname d)

6816

- 6822, 6861

- 6872, 6910

- 6922, 6958

- 6972, 7007

- 7022, 7055

- 7072, 7104

- 7122

This stipulation applies during the time periods for subsistence

- harvesting described below for each community.

Subsistence Whaling and Marine Mammal Hunting Activities by Community

Barrow : Spring bowhead whaling occurs from April to June; Barrow hunters hunt from ice leads from Point Barrow southwestward along the Chukchi Sea coast to the Skull Cliff area. Fall wh aling occurs from August to October in an area extending from approximately 10 miles west of Barrow t o the east side of Dease Inlet. Beluga whaling occurs from April to June in the spring leads between Point Barrow and Skull Cliff; later in the season, bel ugas are hunted in open water around the barrier islands off Elson Lagoon. Walrus are harvested from June to September from west of Barrow southwestward to Peard Bay. Polar bear are hunted from October to June generally in the same vicinity used to hunt wa lrus. Seal hunting occurs mostly in winter, but some open water sealing is done from the Chukchi coastline east as far as Dease Inlet and Admiralty Bay in the Beaufort Sea.

Wainwright : Bowhead whaling occurs from April to June in the spring leads offshore of Wainwright, with whaling camps sometimes as far as 10 to 15 miles from shore. Wainwright hunters hunt beluga whales in the spring lead system from April to June but only if no bowheads are in the area. Later in the summer, from July to August, belugas c an be hunted along the coastal lagoon systems. Walrus hunting occurs from July to August at the southern edge of the retreating pack ice. From August to September, walrus can be hunted at local haulouts with the focal area from Milliktagvik north to Point Franklin. Polar bear hunting occurs primarily in the fall and winter around Icy Cape, at the headland from Point Belcher to Point Franklin, and at Seahorse Island.

Point Lay : Because Point Lay’s location renders it unsuitable for bowhead whaling; beluga wh aling is the primary whaling pursuit. Beluga whales are harvested from the middle of June to the middle of July. The hunt is concentrated in Naokak and Kukpowruk Passes south of Point Lay where hunters use boats to
herd the whales into the shallow waters o f Kasegaluk Lagoon where they are hunted. If the July hunt is unsuccessful, hunters can travel as far north as Utukok Pass and as far south as Cape Beaufort in search of whales. When ice conditions are favorable, Point Lay residents hunt walrus from June t o August along the entire length of Kasegaluk Lagoon, south of Icy Cape, and as far as 20 miles offshore. Polar bear are hunted from September to April along the coast, rarely more than 2 miles offshore.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 7 March 2015
Revision 2 Point Hope : Bowhead whales are hunted from March to June from whaling camps along the ice edge south and southeast of the point. The pack

- ice lead is rarely more than 6 to 7 miles offshore. Beluga whales are harvested from March to June in the same area used for the bowhead whale hunt. Beluga
whales can als o be hunted in the open water later in the summer from July to August near the southern shore of Point Hope close to the beaches, as well as areas north of the point as far as Cape Dyer. Walruses are harvested from May to July along the southern shore of t he point from Point Hope to Akoviknak Lagoon. Point Hope residents hunt polar bears primarily from January to April and occasionally from October to January in the area south of the point and as far out as 10 miles from shore.

This stipulation will remain in effect until termination or modification by the Department of the Interior after consultation with appropriate agencies.

Shell Proposed Actions

Although non e of the blocks listed in S tipulation No. 4 are included in those planned for expl oration
drilli ng in Shell’s EP Revision 2 , Shell voluntarily submit ted to the BOEM a site

- specific 4MP with EP Revision 1, and provided the 4MP to support its application for a MMPA authorization

. The 4MP has
been updated to reflect the revised drilling program in EP Revision 2, but remains substantially the same as the 4MP that is part of the approved EP Revision 1. The 4MP is located in Appendix B

. Shell’s POC, 4MP, and other mitigation measures are designed t o address this change in area s of subsistence activities.

Shell intends to use contractors based in the NSB

, N orthwest Arctic Borough (NWAB) and potentially the Bering Straits region that will in turn provide job opportunities to local residents, including recruitment and training of SAs and PSO s. S ummar ies of key components of the program are presented
below.

Protected Species Observers

Vessel

- based monitoring for marine mammals will be done throughout the period of exploration drilling operations to comply with expected provisions in the MMPA authorizations that Shell receives. Those provisions will be implemented during the exploration drilling program by a team of trained P SO s. The presence of PSO s onboard drilling and transiting support vessels will be a core component of compliance
with the 4MP. The PSO s will be responsible for collecting basic data on observations of marine mammals and for implementing mitigation measures including vessel avoidance measures and factored into decisions concerning operational shutdown. The observations made by PSO s serve as the primary basis
for estimatio n of impacts to marine mammals. Because their ranks include representatives of the Alaska Native community, the PSO s also serve as an important means of providing local hire and local oversight of the monitoring program. PSO s will be stationed on both drilling unit s , ice management vess el s , anchor
handler s and other drilling support vessels engaged in transit to and between drill sites, and other operational and intermittent activities to monitor for marine mamma ls.

Aerial Survey Program

Offshore aerial wildlife monitoring photographic surveys (aka PSO flights) are proposed to start as soon as the ice management, anchor handler and drilling units are at or near the first drill site and would continue throughout the drilling period and until the drilling related vessels have left the exploration drilling area. I n the event vessels enter the Chukchi Sea on or about 1 July, surveys would be initiated on or about 3 July. This start date differs from past practices of beginning five days prior to initiation of an activity and continuing until fi ve days after cessation of the activity because the presence of vessels with helidecks in the area where overflights will occur is one of the main mitigations that will allow for supporting a safe operation of the overflight program this far offshore. A nearshore/ coastal saw

- tooth pattern also may be flown. The offshore aerial wildlife monitoring photographic surveys will be based out of Barrow and the same aircraft will conduct the offshore surveys around the drilling units and the
nearshore/ coastal saw

- tooth pattern.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 8 March 2015
Revision 2 Photographic surveys are proposed to be flown daily, weather permitting, throughout the drilling program. The offshore survey transects over the drilling area w ould be the default priority each day, as opposed to the nearshore/coastal sawtooth pattern. The nearshore/coastal survey pattern w ould be flown only in instances when conditions offshore are not conducive for flying and coastal conditions would, however, s upport an overflight. There also may be isolated instances during the season when the

near shore / coastal survey would be identified as the priority due to a unique biological or operational scenario (e.g., walrus aggregations).

Acoustic Recorders

A combina tion of acoustic recorder technologies will be employed to document the distribution of marine mammals; the distribution of marine mammals in relation to activities; to add clarity to the characterization of exploration drilling sound levels, character, an d propagation; and to document presence of marine mammals in subsistence hunting areas. This will be accomplished by deploying several acoustic recorder buoys in a wide area surrounding the planned locations. A coustic monitoring instruments have been deplo yed in the Chukchi S ea in past years in late July. With drilling proposed to commence in early July, the deployment date would be pushed forward to occur after ice out an d before exploration drilling. Over

- wintering sonobuoys have also been locate d in the proposed explora tion drilling area since 2007. In that early drilling related activities would be initiated upon arrival and while the arrays are being deployed, these over

- wintered recorders would capture the sound associated with early activities.

Sound Modeling

Sound modeling will be c onducted during the exploration drilling program in the Chukchi Sea.

Sound Source Verification

Field measurement of sound propagation profiles of vessels and the drilling unit s will be conducted during different operational modes, so as to determine those activities that produce the greatest opportunities for mitigation. Shell plans to conduct sound source verification (SSV) on the vessels which
did not have a prior SSV in the C hukchi Sea . Since sound levels generated by drilling operations do not exceed sound levels where mitigation measures are required, the utility of SSVs, which are normally used to verify and adjust mit igation distances, is limited. Shell is also utilizing d istributed arrays around the drilling location to measure cumulative sound impacts throughout the drilling process. These arrays are generating more useful information than individual SSVs.

Regarding the drilling units, as noted in the 4MP, exploration dri lling sounds are expected to vary significantly with time due to variations in the level of operations and the different types of equipment used at different times onboard the drilling units. The goals of these measurements are to quantify the
absolute sou nd levels produced by exploration drilling and to monitor its variations with time, distance and direction from the drilling unit; and to measure the sound levels produced by an end

- of

- hole ZVSP

survey u sing a stationary sound source.

Additional Studies

Sh ell plans to participate in additional studies of marine resources in the Chukchi Sea to enable us to
increase our understanding of : (1) baseline conditions and the distribution of critical resources ; (2) interactions between industry activities and marine resources ; and (3) resource status and conservation/management needs. The list of potential studies and monitoring projects includes:

• B aseline studies of the a ir quality, oceanography, sediment chemistry, b enthic an d planktonic communities, fish, marine birds, and marine mammals in the Burger Prospect area ;Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 9 March 2015
Revision 2 • Marine mammal distribution and response to industry activities in the northeastern Chukchi Sea ;

• Participation in, and funding of, walrus and ringed seal tagging studies ;

• Collection of subsistence use of coastal and offshore waters though a system of S As ; and

• Drilling waste discharge and b enthic community monitoring

. With the exception of the discharg e monitoring for the NPDES exploration facilities GP , Shell has been participatin g in these studies since 2006. Reports summarizing the methods and findings of the studies are
listed in S ection 5.0

. Discharge monitoring studies Shell expects to conduct are described in Section 10.0.

Stipulation No. 5

- Lease Sale 193 Conflict Avoidance Mechanisms to Protect Subsistence Whaling and Other Subsistence Harvesting Activities

Exploration and development and production operations shall be conducted in a manner that prevents unreasonable conflicts between the oil and gas industry and subsistence activities. This stipulation applies to exploration, development, and production operations on a lease within the blocks identified below during periods of subsistence use re lated to bowhead whales, beluga whales, ice seals, walruses, and polar bears. The stipulation also applies to support activities, such as vessel and aircraft traffic, that traverse the blocks listed below or Federal waters landward of the sale during perio ds of subsistence use regardless of lease location. Transit for human safety emergency situations shall not require adherence to this stipulation. This stipulation applies to the following blocks:

NR02

- 06, Chukchi Sea

6624, 6625, 6674, 6675, 6723

- 6725, 677 3

- 6775, 6822, 6823, 6872

NR03

- 02, Posey
6872, 6873, 6918

- 6923, 6967

- 6973, 7016

- 7023, 7063

- 7073, 7112

- 7123

NR03

- 03, Colbert
6674, 6723, 6724, 6771

- 6774, 6820

- 6824, 6869

- 6874, 6918

- 6924, 6966

- 6974,

7015

- 7024, 7064

- 7074, 7113

- 7124

NR03

- 04, Solivik Island

6011

- 6023, 6060

- 6073, 6109

- 6122, 6157

- 6171, 6206

- 6219, 6255

- 6268, 6305

- 6317,

6354

- 6365, 6403

- 6414, 6453

- 6462, 6502

- 6511, 6552

- 6560, 6601

- 6609, 6651

- 6658,

6701

- 6707, 6751

- 6756, 6801

- 6805, 6851

- 6854, 6901

- 6903, 6951, 6952, 7001

NR03

- 05, Point Lay West

6014

- 6 024, 6062

- 6073, 6111

- 6122, 6160

- 6171, 6209

- 6221, 6258

- 6269, 6307

- 6317,

6356

- 6365, 6406

- 6414, 6455

- 6462, 6503

- 6510, 6552

- 6558, 6602

- 6606, 6652

- 6655,

6702, 6703

NR04

- 01, Hanna Shoal

6223, 6267

- 6273, 6315

- 6323, 6363

- 6373, 6411

- 6423, 6459

- 6473, 6507

- 6523,

655 6

- 6573, 6605

- 6623, 6654

- 6671, 6703

- 6721, 6752

- 6771, 6801

- 6819, 6851

- 6868,

6901

- 6916, 6951

- 6964, 7001

- 7010, 7051

- 7059, 7101

- 7107Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 10 March 2015
Revision 2 NR04

- 02, Barrow

6003

- 6022, 6052

- 6068, 6102

- 6118, 6151

- 6164, 6201

- 6214, 6251

- 6262, 6301

- 6312,

6351

- 6359, 6401

- 6409, 6451

- 6456, 6501

- 6506, 6551, 6552, 6601, 6602

NR04

- 03, Wainwright

6002

- 6006, 6052, 6053

NS04

- 08, (Unnamed)

6816

- 6822, 6861

- 6872, 6910

- 6922, 6958

- 6972, 7007

- 7022, 7055

- 7072, 7104

- 7122

Prior to submitting an exploration plan or development and production plan (including associated oil

spill response plans) to the MMS for activities proposed during subsistence

- use critical times and locations described below for bowhead whale and other ma rine mammals, the lessee shall consult with the North Slope Borough, and with directly affected subsistence communities (Barrow, Point Lay, Point Hope, or Wainwright) and co

- management organizations to discuss potential conflicts with the siting, timing, a nd methods of proposed operations and safeguards or mitigating measures that could be implemented by the operator to prevent unreasonable conflicts. Organizations currently recognized by
the NMFS and the US FWS for the co

- management of the marine mammals re sources are the Alaska Eskimo Whaling Commission, the Alaska Beluga Whale Committee, the Alaska Eskimo Walrus Commission, the Ice Seal Commission, and the Nan uuq Commission. Through this consultation, the lessee shall make every reasonable effort, includin g such mechanisms as a conflict avoidance agreement, to assure that exploration, development, and production activities are compatible with whaling and other marine mammal subsistence hunting activities and will not result in unreasonable interference with
subsistence harvests.

A discussion of resolutions reached during this consultation process and plans for continued consultation shall be included in the exploration plan or the development and production plan. In particular, the lessee shall show in the p lan how its activities, in combination with other activities in the area, will be scheduled and located to prevent unreasonable conflicts with subsistence activities. The lessee shall also include a discussion of multiple or simultaneous operations, such as ice management and seismic activities, that can be expected to occur during operations in order to more accurately assess the potential for any cumulative effects . Communities, individuals, and other entities who were involved in
the consultation shall be identified in the plan. The RS/FO shall send a copy of the exploration plan or development and production plan (including associated oil

- spill response plans) to the directly affected communities and the appropriate co

- management organizations at the ti me the plans are submitted to the MMS to allow concurrent review and comment as part of the plan approval process. In the event no agreement is reached between the parties, the lessee, NMFS, USFWS, the appropriate co

- management organizations, and any comm unities that could be directly affected by the proposed activity may request that the RS/FO assemble a group consisting of representatives from the parties to specifically address the conflict and attempt to resolve the issues. The RS/FO will invite approp riate parties to a meeting if the RS/FO determines such a meeting is warranted and relevant before making a final determination on the adequacy of the measures taken to prevent unreasonable conflicts with subsistence harvests. The lessee shall notify the RS/FO of all concerns expressed by subsistence hunters during operations and of steps
taken to address such concerns. Activities on a lease may be restricted if the RS/FO determines it is necessary to prevent unreasonable conflicts with local subsistence hunting activities. In enforcing this stipulation, the RS/FO will work with other agencies and the public to assure that potential conflicts are identified and efforts are taken to avoid these conflicts. Subsistence

- harvesting activities occur generally

in the areas and time periods listed below.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 11 March 2015
Revision 2 Subsistence Whaling and Marine Mammal Hunting Activities by Community

Barrow : Spring bowhead whaling occurs from April to June; Barrow hunters hunt from Ice leads from Point Barrow southwestward along the Chukchi Sea coast to the Skull Cliff area; fall whaling occurs from August to October in an area extending from approximately 1 0 miles west of Barrow to the east side of Dease Inlet. Beluga whaling occurs from April to June in the spring leads between Point Barrow and Skull Cliff; later in the season, belugas are hunted in open water around the barrier islands off Elson Lagoon. Wa lrus are harvested from June to September from west of Barrow southwestward to Peard Bay. Polar bear are hunted from October to June generally in the same vicinity used to hunt walruses. Seal hunting occurs mostly in winter, but some open

- water sealing is done from the Chukchi coastline east as far as Dease Inlet and Admiralty Bay in the Beaufort Sea.

Wainwright : Bowhead whaling occurs from April to June in the spring leads offshore of Wainwright, with whaling camps sometimes as far as 10 to 15 miles from s hore. Wainwright hunters hunt beluga whales in the spring lead system from April to June but only if no bowheads are in the area. Later in the summer, from July to August, belugas can be hunted along the coastal lagoon systems. Walrus hunting occurs from J uly to August at the southern edge of the retreating pack ice. From August to September, walruses can be hunted at local haulouts with the focal area from Milliktagvik north to Point Franklin. Polar bear hunting occurs primarily in the fall and winter arou nd Icy Cape, at the headland from Point Belcher to Point Franklin, and at Seahorse Island.

Point Lay : Because Point Lay’s location renders it unsuitable for bowhead whaling, beluga whaling is the primary whaling pursuit. Beluga whales are harvested from th e middle of June to the middle of July. The hunt is concentrated in Naokak and Kukpowruk Passes south of Point Lay where hunters use boats to herd the whales into the shallow waters of Kasegaluk Lagoon where they are hunted. If the July hunt is unsuccessfu l, hunters can travel as far north as Utukok Pass and as far south as Cape Beaufort in search of whales. When ice conditions are favorable, Point Lay residents hunt walruses from June to August along the entire length of Kasegaluk Lagoon, south of Icy Cap e, and as far as 20 miles offshore. Polar bears are hunted from September to April along the coast, rarely more than 2 miles offshore.

Point Hope : Bowhead whales are hunted from March to June from whaling camps along the ice edge south and southeast of th e point. The pack

- ice lead is rarely more than 6 to 7 miles offshore. Beluga whales are harvested from March to June in the same area used for the bowhead whale hunt. Beluga whales can also be hunted in the open water later in the summer from July to Au gust near the southern shore of Point Hope close to the beaches, as well as areas north of the point as far as Cape Dyer. Walruses are harvested from May to July along the southern shore of the point from Point Hope to Akoviknak Lagoon. Point Hope residents hunt polar bears primarily from January to April and occasionally from October to January in the area south of the point and as far out as 10 miles from shore

Shell Proposed Actions:

Shell has actively engaged the NSB, NWAB, and the subsistence communiti es of Kaktovik, Nuiqsut, Barrow, Wainwright, Point Lay, Poi nt Hope, Kivalina

, Kotzebue , Shishmaref , Kiana, Savoonga, and Gambell, and co

- management organizations, including the Alaska Eskimo Whaling Commission (AE W C), Alaska Beluga Whale Committee, the Alaska Eskimo Walrus Commission, the Ice Seal Commission, a nd the Alaska Nanuuq Commission, to discuss potential conflicts between planned oil and gas activities and subsistence use activities. Shell’s EP lease blocks do not lie wi thin the stipulation are a, but support activities associated with the exploration drilling program will transit the stipulation area

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 12 March 2015
Revision 2 Plan of Cooperation

Shell began consulting with potentially affected subsistence communities, stakeholders and federal, state, and local agenci es in 2006 and prepared a POC for its Chukchi Sea open water activities (3D seismic
activities and ves sel transit) in November 2007. Shell has continue d to consult through the date of submitting the final Revised EP 2

. Shell will continue to engage with subsistence stakeholders to build on its past efforts to inform and engage the communities that could be potentially affected by exploration drilling activities in the Chukchi Sea. It is also noted that a POC is requir ed for MMPA authorizations
from NMFS and USFWS. Shell’s POC, 4MP, and other mitigation measures are designed to minimize adverse impacts to subsistence use activities

.
Shell met with public and community leaders beginning in January

- April 2009 specifically to discuss the planned 2010 exploration drilling program in the Chukchi Sea

, as detailed in the initial Chukchi Sea EP

, and to hear their conc erns. Shell prepared a written POC base d on that effort, which described when and where the meetings were held, what was presented by Shell, the comments received, and Shell’s responses to these co mments. The POC also identified mit igation measures that Shell prepared in response to these conce rns. A copy of the POC was attached as an appendix to the initial Chukchi Sea EP

, and was forwarded to NMFS as part of the MMPA application

. Shell’s consultation efforts have continued since that time, and in February

- April of 201 1 , Shell held a series of meetings specifically to discuss the exploration drilling a ctivities outline in the EP Revision 1

. The dates and locations of the meetings held since 20 12 as part of consultation effort associated with exploration drilling in the C hukchi
S ea , along with the persons Shell met with, are listed below in Table 11.0

- 1 . Shell has prepared an
addendum to the POC originally submitted

. The POC addendum included with EP Revision 2 provides information on the meetings held specifically to addr ess the EP Revision 2

. The POC addendum is attached in Appendix D of this document.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 13 March 2015
Revision 2 Table 11.0

- 1 Dates and Locations of Meetings Held Regarding Shell’s Chukchi Sea Exploration Drilling Program for the Development of the POC

2012 Meeting Location Meeting Attendees
23 October Point Lay Plan of Cooperation Community Meeting
24 October Wainwright Plan of Cooperation Community Meeting
26 October Kaktovik Plan of Cooperation Community Meeting
29 October Barrow Plan of Cooperation Community Meeting
30 October Nuiqsut Plan of Cooperation Community Meeting
6 November Barrow NSB Assembly Workshop Meeting
2013 Meeting Location Meeting Attendees

29 July Kotzebue NWAB, City of Kotzebue, KIC ( Kikiktagruk Inupiat Corporation) &
IRA (Indian Reorganization Act) representatives
5 November Barrow NSB Assembly
5 November Wainwright Plan of Cooperation Community Meeting
6 November Point Lay Plan of Cooperation Community Meeting
8 November Barrow Plan of Cooperation Community Meeting
12 November Point Hope Plan of Cooperation Community Meeting
2014 Meeting Location Meeting Attendees 28 January Kotzebue Plan of Cooperation Community Meeting
16 June Barrow Stakeholder Meeting
16 June Wainwright Stakeholder Meeting
30 June Barrow Plan of Cooperation Community Meeting 1 July Wainwright Plan of Cooperation Community Meeting 7 July Point Lay Plan of Cooperation Community Meeting 8 July Point Hope Plan of Cooperation Community Meeting 9 July Kotzebue Plan of Cooperation Community Meeting 17 July Deering Plan of Cooperation Community Meeting
3 November Barrow Plan of Cooperation Community Meeting
6 November Point Lay Plan of Cooperation Community Meeting
201 5 Meeting Location Meeting Attendees

– Position 12 January Kotzebue Plan of Cooperation Community Meeting 13 January Wainwright Plan of Cooperation Community Meeting 22 January Buckland Plan of Cooperation Community Meeting 22 January Deering Plan of Cooperation Community MeetingRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 14 March 2015
Revision 2 Marine Mammal Co

- Management Groups

Shell facilitated meetings with the co

- management groups including the AEWC, Alaska Beluga Whale Committee, the Alaska Eskimo Walrus Commission, the Ice Seal Commission, and the Alaska Nanuuq Commission beginning in June 2006, and continues to meet with these groups . Shell continues to me e t with representatives of these co

- management groups to discuss our exploration drilling plans to inform
them of Shell’s plann ed activities and discuss potential conflicts that could arise with regards to the siting, timing, and method of the planned operations as well as mitigation mea sures designed to avoid or minimize any such effects

.

Stipulation No. 6

- Pre

- Booming Requirements for Fuel Transfers

Fuel transfers (excluding gasoline transfers) of 100 b arrels or more will require pre

- booming of the fuel barge(s). The fuel barge must be surrounded by an oil

- spill

- containment boom during the entire transfer operation to help reduce any adverse effects from a fuel spill. The lessee’s oil

- spill

- response pl ans must include procedures for the pre

- transfer booming of the fuel barge(s)

.

Shell Proposed Action:

Shell has prepared a FTP that covers activities with its planned exploration drilling program in the Chukchi Sea. A copy of the plan is provided in Appendix I. Shell has revised the attached FTP from that
was submitted to BOEM with EP R evision 1 to includ e a variety of booming scenarios depending on
whether the fuel transfer is from vessel

- to

- vessel, vessel

- to

- drilling unit and dock

- to

- vessel.

Stipulation No. 7

- Lighting of Lease Structures to Minimize Ef fects to Spectacled and Steller’s
eider

This stipulation will minimize the likelihood that spectacled and Steller’s eiders will strike drilling
structures or vessels. The stipulation also provides additional protection to eiders within the blocks listed below and Federal waters landward of the s ale area, including the Ledyard Bay Critical Habitat Area, during times when eiders are present.

(A) General conditions: The following conditions apply to all exploration activities.

(1) An EP must include a plan for recording and reporting bird strikes. All bird collisions (with vessels, aircraft, or drilling structures) shall be documented and reported within 3 days to MMS. Minimum information will include species, date/time, location, weather, identification of the vessel, and aircraft or drilling struc ture involved and its operational status when the strike occurred. Bird photographs are not required, but would be helpful in verifying species. Lessees are advised that the
US FWS does not recommend recovery or transport of dead or injured birds due to avi an influenza

concerns.
(2) The following conditions apply to operations conducted in support of exploratory and delineation drilling.

(a) Surface vessels (e.g., boats, barges) associated with exploration and delineation drilling operations should avoid op erating within or traversing the listed blocks or Federal waters between the listed blocks and the coastline between April 15 and June 10, to the maximum extent practicable. If surface vessels must traverse this area during this period, the surface vessel operator will have ready access to wildlife hazing equipment (including at least three Breco buoys or similar devices) and personnel trained in its use; hazing equipment may located onboard the vessel or on a nearby oil spill response vessel, or in Point L ay or Wainwright. Lessees are required to provide information regarding their operations within the area upon request of MMS. The MMS may request information regarding number of vessels and their dates of operation within the area.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 15 March 2015
Revision 2 (b) Except for emergencies or human/navigation safety, surface vessels associated with exploration and delineation drilling operations will avoid travel within the Ledyard Bay Critical Habitat Area between July 1 and November 15. Vessel travel within the Ledy ard Bay Critical Habitat Area for emergencies or human/navigation safety shall be reported
within 24 hours to MMS.

(c) Aircraft supporting drilling operations will avoid operating below 1,500 feet above
sea level over the listed blocks or Federal waters be tween the listed blocks and the coastline between April 15 and June 10, or the Ledyard Bay Critical Habitat Area between July 1 and November 15, to the maximum extent practicable. If weather prevents attaining this altitude, aircraft will use pre

- designat ed flight routes. Predesignated flight routes will be established by the lessee and MMS, in collaboration
with the US FWS, during review of the EP. Route or altitude deviations for emergencies or human safety shall be reported within 24 hours to MMS.

(B) Lighting Protocols : The following lighting requirements apply to activities conducted between April 15 and November 15 of each year.

(1) Drilling Structures: Lessees must adhere to lighting requirements for all exploration or delineation drilling structures so as to minimize the likelihood that migrating marine and coastal
birds will strike these structures. Lessees are required to implement lighting requirements aimed at minimizing the radiation of light outward from exploration or delineation dri lling structures to minimize the likelihood that birds will strike those structures. These requirements establish a coordinated process for a performance

- based objective rather than pre

- determined prescriptive requirements. The performance

- based objective is to minimize the radiation of light outward from exploration/delineation structures while operating on a lease or if staged within nearshore Federal waters pending lease deployment.

Measures to be considered include but need not be limited to the followi ng:

• Shading and/or light fixture placement to direct light inward and downward to living and work structures while minimizing light radiating upward and outward;

• Types of lights;

• Adjustment of the number and intensity of lights as needed during specific ac tivities;

• Dark paint colors for selected surfaces;

• Low

- reflecting finishes or coverings for selected surfaces; and

• Facility or equipment configuration.

Lessees are encouraged to consider other technical, operational, and management approaches that
could be applied to their specific facilities and operations to reduce outward light radiation. Lessees must provide MMS with a written statement of measures that will be or have been taken to meet the lighting objective, and must submit this information with an EP when it is submitted for regulatory review and approval pursuant to 30 CFR 550 .203.

(2) Support Vessels: Surface support vessels will minimize the use of high

- intensity work lights, especially when traversing the listed blocks and federal waters between the listed blocks and the coastline. Exterior lights will be used only as necessary to illuminate active, on

- deck work areas during periods of darkness or inclement weather (such as rain or fog), otherwise they will be turned off. Interior lights and ligh ts used during navigation could remain on for safety.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 16 March 2015
Revision 2 For the purpose of this stipulation, the listed blocks are as follows:

NR02

- 06, Chukchi Sea

6624, 6625, 6674, 6675, 6723

- 6725, 6773

- 6775, 6822, 6823, 6872

NR03

- 02, Posey
6872, 6873, 6918

- 6923, 6967

- 6973, 7016

- 7023, 7063

- 7073, 7112

- 7123

NR03

- 03, Colbert
6674, 6723, 6724, 6771

- 6774, 6820

- 6824, 6869

- 6874, 6918

- 6924, 6966

- 6974,

7015

- 7024, 7064

- 7074, 7113

- 7124

NR03

- 04, Solivik Island

6011

- 6023, 6060

- 6073, 6109

- 6122, 6157

- 6171, 6206

- 6219, 6255

- 6268, 6 305

- 6317,

6354

- 6365, 6403

- 6414, 6453

- 6462, 6502

- 6511, 6552

- 6560, 6601

- 6609, 6651

- 6658,

6701

- 6707, 6751

- 6756, 6801

- 6805, 6851

- 6854, 6901

- 6903, 6951, 6952, 7001

NR03

- 05, Point Lay West

6014

- 6024, 6062

- 6073, 6111

- 6122, 6160

- 6171, 6209

- 6221, 6258

- 6269, 6307

- 63 17,

6356

- 6365, 6406

- 6414, 6455

- 6462, 6503

- 6510, 6552

- 6558, 6602

- 6606, 6652

- 6655,

6702, 6703

NR04

- 01, Hanna Shoal
6223, 6267

- 6273, 6315

- 6323, 6363

- 6373, 6411

- 6423, 6459

- 6473, 6507

- 6523,

6556

- 6573, 6605

- 6623, 6654

- 6671, 6703

- 6721, 6752

- 6771, 6801

- 6819, 6851

- 6868,

6901

- 6916, 6951

- 6964, 7001

- 7010, 7051

- 7059, 7101

- 7107

NR04

- 02, Barrow

6003

- 6022, 6052

- 6068, 6102

- 6118, 6151

- 6164, 6201

- 6214, 6251

- 6262, 6301

- 6312,

6351

- 6359, 6401

- 6409, 6451

- 6456, 6501

- 6506, 6551, 6552, 6601, 6602

NR04

- 03, Wainwright

6002

- 6006, 6052, 6053

NS04

- 08, (Unnamed)

6816

- 6822, 6861

- 6872, 6910

- 6922, 6958

- 6972, 7007

- 7022, 7055

- 7072, 7104

- 7122

Nothing in this stipulation is intended to reduce personnel safety or prevent compliance with other regulatory requirements (e.g., U.S. Coast Guard (USCG) or Occupational Safety and Health Administration) for marking or lighting of equipment and work areas.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11

- 17 March 2015
Revision 2 Shell Proposed Actions:

Stipulation No.7 has four par ts. Part A(1) mandates that EPs for exploration drilling anywhere in the Chukchi include a plan fo r recording and reporting bird strikes, and therefore applies to Shell. Parts A(2) and B(2) place restrictions and lighting requirements on vessel and aircraft operations in certain listed blocks, in federal waters shoreward of those blocks, and in the Led yard Bay C ritical Habitat Unit (LBC HU ) , during specific dates

. T hese restrictions would apply to any activities associated with Shell ’ s EP Revision 2 that would take place in these areas during these dates. Part B(1) places lighting requirements on drillin g structures and applies to the use of drilling structures anywhere in the Chukchi Sea, and therefore applies to Shell ’ s EP Revision 2

. Part B(2) also places restrictions on the use of lights on support vessels in the listed blocks and federal waters shore ward of these blocks, and these restrictions would apply to any vessel traffic associated with Shell ’ s EP Revision 2 that would occur in these specific

areas

. Shell has developed a Bird Strike Avoidance and Lighting Plan (Appendix E ) that covers the planned exploration drilling pr ogram

. In develop ing the plan, Shell considered all the measures identified for consideration in the stipulation, and selected the most proven and practical measures to minimize the
likelihood that marine birds will s trike the drilling unit s or support vessels. Shell’s plan includes:

• Bird strike monitoring will include recording and reporting bird strikes for the collection of information on bird strikes and lighting configuration. This information can be used to bett er understand methods to reduce bird strikes ;

• Installing shading and directing some lights on drilling unit s inward and downward to living and work structures to minimize the amount of light radiating from the drilling unit s ;

• Minimizing the use of high

- int ensity work lights on support vessels ; and

• Restricting aircraft and vessel traffic such as restrictions on travel routes and flight altitudes

, including: the avoid ance of travel within the LBCHU between 1 July and 15 November by the drilling unit s and all support vessels.

The risk of Shell’s exploration drilling program having an effect on marine birds, especially Steller’s eiders and sp ectacled eiders, due to collisions, is minimal because exploration drilling would occur after the spring migration of most of these species, and more than 6 4 mi ( 103 km) offshore where the bird presence is relatively low.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 12

- 1 March 2015
Revision 2 

## SECTION 12.0 ENVIRONMENTAL MITIGA TION MEASURE
INFORMATION

a) Permits and Authorizations

The General Information section (Section 2.0) identifies the permits and authorizations required for the planned exploratio n drilling program. Shell will adhere to the mitigation measures required by these permits and authorizations

. In addition to the permits and authorizations, Shell has met with marine
mammal co

- management groups, including the AEWC

, Whaling Captains Associations, NSB and NWAB community members, to discuss their concerns regarding marine mammal subsistence resources including the bowhead whale, b eluga whale, walrus, ice seal, and polar bea r.

b) Protected Species

Species that occur within the northeastern Chukchi Sea and are listed under the ESA as either threatened or endangered are listed below in Table 12.b

- 1. The Kittlitz’s murrelet

, yellow

- bille d loon, and Pacific walrus
are included in the ta ble only as candidate species. NMFS published a final rule listing the Arctic, Okhotsk, and Baltic subspecies of ringed seals as threatened and the Ladoga subspecies as endangered under the ESA (77 FR 76706

- 76738 December 28, 2012). The only subspecies that occurs in the northeastern Chukchi Sea is the Arctic subspecies.

Potential effects on these species due to activities associated with the planned exploration drilling program
in EP Revision 2 , which includes the addition of simultaneous drilling by a second drilling unit

, are analyzed in the EIA provided in Appendix C

. The proposed m itigation measures , which have been designed
to avoid or minimize any effects on these species, are described below in Section 12 .0 (c).

Table 12.b

- 1 Species Found in the N ortheastern Chukchi Sea and Protected U nder the ESA

Common Name Scientific Name ESA Status Extralimital 3 (Yes/No) spectacled eider Somateria fischeri threatened N o Steller’s eider Polysticta stelleri threatened N o

bearded seal 1 ,2 Erignathus barbatus (Beringia distinct population segment) candidate No ringed seal Phoca hispida threatened No
Pacific walrus 2 Odobenus rosmarus divergens candidate N o polar bear Ursus maritimus threatened N o bowhead whale Balaena mysticetus endangered N o fin whale Balaenoptera physalus endangered Y es humpback whale Megaptera novaeangliae endangered Y es

1 Treated as candidate

– threatened status vacated.

2 Pacific walrus and bear d ed seals are included in table only as a candidate species, which receive no protection under the ESA

. 3 Extralimital

- not found within a given geographic area
No critical habitat has been designated for the fin whale

, h umpback whale , and bowhead whale

. Critical habitat has been designated for the Steller’s eider but none is located in the Chukchi Sea. Critical habitat has been designated for the spectacled eider, with the nearest critical habitat being located in Ledyard Bay more
than 5 4 mi (87 km) from the Burger Prospect. NMFS proposed critical habitat for the Arctic ringed seal in the northern Bering, Chukchi, and Beauf ort Seas off of Alaska in December 2014.

The USFWS issued a final rule on 7 December 2010 designating three types of critical habitat for the polar
bear ; sea ice habitat, barrier island habitat, an d terrestrial denning habitat; this polar bear critical hab itat designation has since been vacated. Potential effects on critical habitat due to activities associated with the planned exploration drilling program are analyzed in the EIA provided in Appendix C

. The planned exploration drilling program would have no effect on spectacled eider critical habitat.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 12

- 2 March 2015
Revision 2 Table 12.b

- 2 Marine Mammals 1 F ound in the N ortheastern Chukchi Sea and Protected U nder the
MMPA

Common Name Scientific Name ESA Status MMPA Status Extralimital (Yes/No) beluga whale 1 Delphinapterus leucas not listed

-- N o narwhal Monodon monoceros not listed

-- Yes
killer whale Orcinus orca not listed

-- N o harbor porpoise Phocoena phocoena not listed

-- N o bowhead whale Balaena mysticetus endangered depleted N o gray whale Eschrichtius robustus not listed

-- Y es fin whale Balaenoptera physalus endangered depleted Y es minke whale Balaenoptera acutorostrata not listed

-- Y es humpback whale Megaptera novaeangliae endangered depleted Y es

bearded seal Erignathus barbatus (Beringia distinct population segment) candidate depleted N o

spotted seal 1 Phoca largha Arctic population
segments not list ed -- N o

ringed seal Phoca hispida threatened depleted No
ribbon seal Histriophoca fasciata not listed No
Pacific walrus 2 Odobenus rosmarus divergens candidate

-- No polar bear Ursus maritimus threatened depleted No

1 Populations of some species identified as not listed, such as beluga & spotted seal, are listed but those populations are not found in the Chukchi Sea

.

2 Pacific walrus has been petitioned for listing u nder ESA, has undergone status review

, and listing was found to be warranted but precluded by higher

priorities

– and is therefore considered a candidate species by USFWS

. In accordance with the MMPA, a walrus use ar ea has been designated over Hanna Shoal (i.e. the HSWUA) located adjacent to Shell’s Burger Prospect. The HSWUA is a large area (approximately 9,500 mi 2 ) to the northeast of the Burger Prospect that the USFWS designated as an area utilized by Pacific walru s during the
summer months

. The planned exploration drilling program will likely involve the non

- lethal incidental take of marine
mammals. The projected incidental takes are provided in Section 10 .0 of this document. Shell has
submitted a MMPA application to the NMFS for the incidental take of whales and seals, and MMPA application s to the USFWS for the non

- lethal incidental take of polar bears and Pacific walrus and
in tentional take of polar bears and Pacific walrus

. The MMPA application s contain a 4MP , which is attached in Appendix B

. The USFWS MMPA application s contain a bear and walrus avoidance and
human encounter / interaction plan. Shell has also developed and will implement a Bird Strike Avoidance and Lighting Plan (Appendix E ). All three of these documents describe mitigation measures that Shell will implement to minimize any effects on protected species. The authorizations may also contain added mitigation measures to help avoid or minimize incidental takes. A summary of mitigation measures that
will be undertak en by Shell is provided below.

c) Mitigation Measures

The permits and authorizations table included in Section 2.0 lists the authorizations and necessary permits to conduct the planned exploration drilling program. Shell will adhere to the mitigation measures required by these authorization s

. In addition to meeting all regulatory requirements, Shell is committed to other mitigation measures including those that will decrease any potential conflicts between exploration drilling ac tivi ties and
subsistence harvests. The preface of the EIA (Appendix C) provides detail s on mitigation measures that have been deleted, those that have been changed and those that have been added. The following is the current list of mitigation measures for EP Revision 2

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 12

- 3 March 2015
Revision 2 Communications

• Shell has developed a Communication Plan and will implement this plan before initiating exploration drilling operations to coordinate activities with local subsistence users, as well as Village Whaling Captains’ Associations, to minimize the risk of interfering with subsistence hunting activities, and keep current as to the timing and status of the bowhead whale hun t and
other subsistence hunts. The Communication Plan includes procedures for coordination with
Communications an d Call Centers ( Com Centers ) to be located in coastal villages along the Chukchi Sea during Shell’s proposed exploration drilling activities.

• Shell will employ local subsistence advisors ( SAs ) from the Chukchi Sea villages that may be potentially impacted by Shell’s exploration drilling activities. The SAs will provide consultation and guidance regarding the whale migration and subsistence activities. There will be one SA per village, working approximately 8

- hr per day and 40

- hr week s during the drilling se asons. The SA will use local knowledge (Traditional Knowledge) to gather data on subsistence life style within the community and provide advice on ways to minimize and mitigate potential negative impacts to subsistence resources during the drilling season. Responsibilities include reporting any subsistence concerns or conflicts; coordinating with subsistence users; reporting subsistence

related comments, concerns, and information; coordinating with the Com and Call Center personnel; and, advising how t o avoi d subsistence conflicts.

Aircraft Travel

• Aircraft over land or sea shall not operate below 1,500 ft. (457 m) altitude unless engaged in marine mammal monitoring, approaching, landing or taking off, in poor weather (fog or low ceilings), or in an emergen cy situation.

• Aircraft engaged in marine mammal monitoring shall not operate below 1,500 ft. (457 m) in areas of active whaling; such areas to be identified through communications with the Com Centers and
SAs

.

• Except in an emergency, a ircraft will not oper ate at an altitude lower than 1,500 ft. ( 457 m )
within 0.5 mi

. (0.8 km) of polar bears when observed on land or ice.

• Helicopters will not operate at an altitude lower than 3,000 ft. (914 m) within 1 mi. (1.6 km) of walrus groups observed on land, and fixed

- wing aircraft will not , except in an emergency, operate at an altitude lower than 1,500 ft. (457 m) within 0.5 mi. ( 805 m ) of walrus groups observed on ice, or within 1 mile (1,610 m) of walrus groups observed on land

.

• If aircraft must be operated below 1,500 ft. (457 m) because of weather, the operator will avoid areas of known walrus and polar bear concentrations and will take precautions to avoid flying directly over or within flying within 0.5 mi. (805 m) o f these areas.

.

Vessel Travel

• The drilling units and support vessels anticipat e they will enter the C hukchi Sea through the Bering Strait on or about 1 July 4 , minimizing effects on marine mammals and birds that frequent open leads and minimizing effects on spring and early summer bowhead whale hunting.

• The transit route for the drilling units and dr illing support vessels will avoid known fragile ecosystems and the LBCHU, and will include coordination through Com Centers.

4 See supra fn. 1.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 12

- 4 March 2015
Revision 2 • PSOs will be aboard the drilling units and all transiting support vessels

.

• Except in an emergency, v essels will not approach within 0.5 mi. (0.8 km) of walruses or polar
bears when observed on ice.

• Except in an emergency, v essels will not approach within 1.0 mi. (1.6 km) of groups of walruses
or 0.5 mi. (0.8 km) of polar bears when observed on land

.

• When within 900 ft. (274 m) of whales, vessels will reduce speed, avoid separating members from a group and avoid multiple changes of direction.

• Vessels should take all reasonable precautions (i.e., reduce speed, change course heading) to maintain a minimum operational exclusion zone of 0.5 mi ( 0.8 km ) around groups of 12 or more
walruses in the water.

• Vessel speed will be reduced during inclement weather conditions in order to avoid collisions
with marine mammals.

• Shell will communicate and coordinate with the Com Centers regarding all vessel transit s

.

• Use of some lighting on the drilling units and support vessels will be minimized and shaded to reduce potential disorientation and attraction of birds and to reduce the possibility of a bird collision (Bird Strike Avoidance and Lighting Plan, Appendix E

, EP Revision 2).

Exploration Drilling Operations

• Critical operations will not be started if potential hazards (ice floe, inclement weather, etc.) are in the vicinity and there is not sufficient time to finish the critical operation before the arrival o f the hazard at the drill site ( Appendix F )

.

• The blowout prevention program will be enhanced through the use of two sets of blind/shear

rams

.

• For drill sites at which a MLC is drilled by bit, a ROV control panel will be SS , linked to the BOP by an umbilical, with sufficient pressured water

- based fluid to operate the BOP

. In the event the MLC is drilled by the MLC ROV s ystem

, no additional SS control panel is required as an ROV will have direct access to the BOP panel located in the MLC.

• Provisions for a second relief well drilling unit will be in

- place in the event that the primary drilling vessel is disabled and not capable of drilling its own relief well. Both the Discoverer and
Polar Pioneer will serve as its own prim ary relief we ll drilling unit. If the Discoverer or the Polar

Pioneer cannot be used to drill a relief well, the other drilling unit (secondary relief well drilling unit) wo uld be used for that purpose. The drilling units will be in the Lease Sale 193 Area operating as primary drilling units, or one may be no further distant than Dutch Harbor when the other drilling unit is drilling in hydrocarbon bearing zones. In either case, the secondary relief
well drilling unit could be mobilized to the location in the Burger Pro spect, moored, and drill a
relief well and kill the flow within 38 days.

• Airgun arrays will be ramped up slowly during ZVSP surveys to warn cetaceans and pinnipeds in the vicinity of the airguns and provide time for them to leave the area and avoid potenti al injury or impairm ent of their hearing abilities. Ramp ups from a cold start when no airguns have been firing will begin by firing a single airgun in the array. A ramp up to the required airgun array volume will not begin until there has been a minimum o f 30 min of observation of the safety zone by PSOs to assure that no marine mammals are present. The safety zone is the extent of the 180
dB radius for cetac eans and 190 dB for pinnipeds. The entire safety zone must be visible during
the 30 min lead

- in to an array ramp up . If a marine mammal(s) is sighted within the safety zone during the 30 min watch prior to ramp up, ramp up will be delayed until the marine mammal(s) is sighted outside of the safety zone or the animal(s) is not sighted for at least 15 t o 30 min: 15 min for small odontocetes and pinnipeds, or 30 min for balee n whales and large odontocetes.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 12

- 5 March 2015
Revision 2 Ice Management

• Real time ice and weather forecasting will be from the Shell Ice and Weather Advisory Center

.

• Shell has developed and will implement an Adaptive Approach to Ice Management in Areas Occupied by Pacific Walruses (Appendix J ).

Oil Spill Response

• The primary OSR V will be on standby at all times when drilling into zones capable of flowing liquid hydrocarbons in measurable quantities to ensure that OSR capability is available within one hour, if needed.

• Shell will deploy OSR support vessels capable of collecting oil on the water in excess of the
calculated WCD flow rate of a blowout in the unlikely event that one should occur. The
remain ing OSR support vessels will be fully engaged within 72 hours.

• In addition to the OSR support vessels , oil spill containment equipme nt will be available for use in the unlikely event of a blowout. The containment s ystem tug s and barge will be located in or near Goodhope Bay, Kotzebue Sound. This equipment is designed for maximum reliability, ease of operation, flexibility and robustnes s so it could be used for a variety of blowout situations. It is anticipated that the containment system could arrive at the scene of a blowout and be capable of receiving hydrocarbons in eight days, depending on weather and the characteristics of the
blowout.

• Capping stack equipment will be stored aboard one of the ice management vessels and will be
available for deployment within 24 hours , depending on ice, weather and location, in the unlikely event of a blowout. Capping stack equipment consist of SS devices assembled to provide direct surface intervention capability with the following prior ities:

o Attaching a device or series of devices ( i.e. the capping stack) to the well to affect a seal capable of withstanding the MAWP and closing the assembly to completely seal the well against further flows ( this intervention process is commonly called “ Cap and Contain”)

, and

o Attaching a device or series of devices (i.e. the capping stack) to the well and diverting flow to surface vessel(s) (i.e. the containment system on the Arctic Challenger barge ) equipped for separation and disposal of hydrocarbons ( this intervention proces s is commonly called “ Cap and Flow ”)

.

• A polar bear culvert trap has been constructed in anticipation of OSR needs and will be available prior to exploration drilling.

• Pre

- booming will be conducted for all fuel transfers between vessels.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 12

- 6 March 2015
Revision 2 Air Emissions

• Procuring ULSD fuel or a fuel with equal or lower sulfur content to reduce SO 2 emissions for each of the drilling units and all vessels operating as part of the exploration drilling program; and

• Establishing fuel restrictions on most of the propulsion and generators engines for the support
vessels.

Appendix K provides a summar y of the emission reduction measure s and the resulting emissions reductions, as applied in the AQRP analysis.

Shell has elected to present maximum projected emissions in the AQRP emissions inventory for the 30 CFR 550.303(d) exemption formula analyses without consideration of existing emission controls as reduction
measures on the Discoverer ’s primary generation u nits or any of the support vessels. These emission controls include the following:

• selective catalytic reduction (SCR) emission controls to reduce NO X emissions on Discoverer ’s primary generation units and certain units on support vessels;

• catalytic diesel particulate filters (CDPF) emission controls to reduce CO, particulate matter (PM), and
VOC emissions on the Discoverer ’s primary generation units and certain units on support vessels; and

• OxyCat emission controls to reduce CO, PM, and VOC emissions on certain units on support vessels.

The 30 CFR 550.303(d) exemption analyses in Section 7(e) conservatively assume the emission controls are not employed as emission reduction measures. As a result, Shell is not required to operate these controls,
but is vo luntarily committing to do so. Therefore, emissions reductions resulting from the voluntary commitment to operate the controls are not quantified in the AQRP emission inventories presented in Appendix K and thus no corresponding monitoring is proposed for these emission controls.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 1 March 2015
Revision 2 

## SECTION 13.0 SUPPORT VESSELS AND AIRCRAFT
INFORMATION

a) Planned Vessel and Aircraft List

• Drilling unit s : Discoverer and Polar Pioneer

• Ice management vessel s (x2)

• Anchor handler s (x3)

• O SV s ( x3 )

• Science v essel s (x2)

• MLC ROV s ystem vessel

• Support t ugs (x 2 )

• Shallow water vessels (x2)

• S upply tugs (x2) and barges ( x2 ) (one tug of which may have temporary duties accompanying the Discoverer during transiting to and from a drill site)

• OSR V (x1)

• OSR tugs (x2) and barge s (x2)

• O ST s ( x2 )

• Containment s ystem ( tug [x2] and barge [x1]

• SAR helicopter

• Crew change/resupply helicopters (x 3 )

• Fixed wing aircraft for ice reconnaissance

• Fixed wing aircraft for PSO flights

• Fixed wing aircraft for crew change between Barrow and Wainwright

Drilling Units

The Discoverer and the Polar Pioneer will be the drilling unit s used to drill the wells on the Burger Prospect. The specifications for these drilling units are listed in Section 1c).

Support Vessels

The drilling unit s will be supported by the types of vessels listed in Table 13.a

- 1.

Oil Spill Response Vessels

The OSR support vessels will consist of those types of vessels listed in Table 13.a

- 2.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 2 March 2015
Revision 2 Table 13.a

- 1 Specifications of Support Vessel Types

Specification Ice Management
Vessel s (x2) 1,2 Anchor
Handlers

(x3) 1, 3 OSVs (x3) 1, 4 Science
Vessel s (x2) 1,5 Shallow
Water Vessel s (x2) 1,6 Support Tugs (x2) 1,7 Supply Tug and Barges (x2) 1,8 MLC
ROV System
Vessel 1,9 Tug (x2) Barge (x2)

Length 380 ft. (116 m) 361 ft. (110 m) 300 ft. (91.5 m) 300 ft. (91.5 m) 85 ft. (25.9 m) 146 ft. (44.5 m) 150 ft. (45.7 m) 400 ft. (122 m) 280 ft. (85.3 m)

Width 85 ft. (26 m) 80 ft. (24.4 m) 6 4 ft. ( 19.5 m) 6 4 ft. ( 19.5 m) 20 ft. (6.1 m) 46 ft. (14 m) 40 ft. (12.2 m) 99.5 ft. (30.3 m) 60 ft. (18.3 m)

Draft 27 ft. (8.4 m) 28 ft. (8.5 m) 19.6 ft. ( 5.9 m) 19.6 ft. ( 5.9 m) 4.5 ft. (1.4 m) 21 ft. (6.4 m) 19.5 ft. (5.9 m) 25 ft. (7.6 m) 16.5 ft. (5 m)

Accommodations 77 64 50 50 50 13 11

-- 26

Maximum Speed 16 knots (30 km/hr.) 15 knots (28 km/hr.) 13 knots (24 km/hr.) 13 knots (24 km/hr.) 20 knots (37 km/hr.) 16 knots (30 km/hr.) 12 knots (22 km/hr.) -- 13 knots (24 km/hr.)

Available Fuel Storage 14,192 bbl (2,256 m 3 ) 11,318 bbl (1,799 m 3 ) 5,786 bbl (920 m 3 ) 5,786 bbl (920 m 3 ) 43 bbl (6.8 m 3 ) 5,030 bbl ( 7 99 m 3 ) 4,800 bbl (774 m 3 ) -- 6,233 bbl (991 m 3 )

1 Or similar vessel

2 Based on Nordica

3 Based on Aiviq

4 Based on the Harvey Champion

5 Based on the Harvey Champion

6 Based on the King C (formerly the Diana G )

7 Based on the tug Ocean Wave

8 Based on the Lauren Foss (tug) and Tuuq (barge)

9 Based on the Harvey SpiritRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 3 March 2015
Revision 2 Table 13.a

- 2 Specifications of the Major Oil Spill Response Vessels

Specifications OSRV 1,2
(x1) Offshore OSR 1,3 Nearshore OSR 1,4 OST 1,5 (x1) OST 1,6 (x1) Containment System 1,7

Tug (x1) Barge (x1) Tug (x1) Barge (x1) Tug (x2) Barge (x1)

Length 301 ft. (91.9 m) 1 36 ft. ( 41.4 m) 333 ft. (101.5 m) 90 ft. (27.4 m) 205 ft. (62.5 m) 748 ft. (228 m) 813 ft. (248 m ) 150 ft. (45.7 m) 316.5 ft. (96.5 m)

Width 60 ft. (18.3 m) 37 ft. ( 11.2 m) 76 ft. (23.1 m) 32 ft. (9.8 m) 90 ft. (27.4 m) 105 ft. ( 32 m) 141 ft. (48 m) 40 ft. (12.2 m) 105 ft. (32 m)

Draft 19 ft. (5.8 m) 20 ft. ( 6.0 m) 22 ft. (6.7 m) 10 ft. (3 m) 15 ft. (4.6 m) 66 ft. (20 m) 69 ft. (21 m) 19.5 ft. (5.9 m) 12.5 ft. (3.8 m)

Accommodations 41 10

-- 8

-- 25 25 11 72

Maximum Speed 16 knots (30 km/hr.) 12 knots (22 km/hr.) -- 12 knots (22 km/hr.) -- 15 knots (28 km/hr.) 15 knots (28 km/hr.) 10 knots (19 km/hr.) --

Available Fuel Storage 7,692 bbl (1,223 m 3 ) 3,690 bbl ( 586 m 3 ) 3,857 bbl ( 616 m 3 ) 1,286 bbl (204.5 m 3 ) -- 16,121 bbl (2,563 m 3 ) 20,241 bbl (3,218 m 3 ) 4,800 bbl (763 m 3 ) 6,630 bbl (1,054 m 3 )

Available Liquid Storage 12,245 bbl (1,947 m 3 ) -- 76,900 bbl (12,226 m 3 ) -- 17,000 bbl (5,183 m 3 ) 106,000 bbl 8
(16,852 m 3 ) 670,000 bbl (106,518 m 3 ) -- --

Workboats (3) 34 ft.
work boats -- -- - - (1) skim boat 47 ft. (14 m)

(3) work
boats 34 ft.

(10 m) (4) mini

barges -- -- -- --

1 Or similar vessel

2 Based on the Nanuq

3 Based on the tug Guardsman (tug) and Klamath (barge)

4 Based on the Point Oliktok (tug) and Endeavor (barge)

5 Based on a Panamax type tanker

6 Based on an Aframax type tanker

7 Based on the Corbin Foss (tug), Arctic Challenger (barge)

8 Total available storage is 350,000 bbl; however, 244,000 bbl of ULSD or a fuel with equal or lower sulfur content (used to refuel the drilling units and support vessels) will take up storage space, leaving 10 6 ,000 bbl for recovered liquid ds. S torage space for recovered liquids will increase as fuel is dispensed for refueling.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 4 March 2015
Revision 2 Photograph of an Ice Management Vessel

Two primary ice management vessels will support the drilling units (photograph of the M/V Nordica ). These vessels will enter and exit the Chukchi Sea with the drilling
units or before and will generally remain in the vicinity of the drilling units during the drilling season. Ice management and ice reconnaissance is expected to occur at distances of 20 mi (32 km) and 30 mi (48 km) respectively. However, these vessels may have to expand beyond these ranges depending on the ice conditions.

Photograph of an Anchor Handler

Three anchor handlers (photograph of the Aiviq ) will support the drilling units and the containment system tug s and barge

. These vessels will enter and exit the Chukchi Sea with the drilling units or before, and will generally remain in the vicinity of the drilling units during the drilling season. When not anchor handling, these vessels will be available to provide other general support if needed.

Photograph of an OS V

The planned exploration dri lling operations will require
three OSVs for resupply of the drilling units and support vessels. D rilling materials , food, fuel and other supplies will be picked up in Dutch Harbor (with possible minor resupply coming out of K otzebue) and transported to the drilling units and support vessels.

Shell plans to use up to two science vessels to monitor discharges from the drilling units during drilling. The science vessel specifications are based on a large OSV ( Harvey Champion [pho tograph] or similar) but may be a smaller vessel. This vessel will help sample drilling discharges that are defined in the EPA NPDES exploration facilities GP AKG

- 28

- 8100.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 5 March 2015
Revision 2 Photograph of a Shallow Water Vessel

Photograph of a Support Tug

Two support tugs will tow the Polar Pioneer to the Burger Prospect (photograph of the Ocean Wave ). After the Polar

Pioneer is moored, the tugs will remain in the vicinity of the drilling units to help move them in the event that either drilling unit has to be moved off a drilling site due to ice or any other event.

Photograph of a Supply Tug

Shell plans to use tw o tugs and supply barges (photograph of the tug Lauren Foss ) that may be based in Kotzebue Sound. The barges will house well material for the drilling vessels and for the containment system tug s and barge, provide contingency accommodations for personnel in Kotzebue Sound, and carry mooring equipment for the containment system barge.

Shell also plans to use an OSV type vessel to support an
MLC ROV system that may be used to construct some of
the MLCs. If used, this vessel will be located at a drill site on the Burger Prospect. When not in use, the vessel will be outside of the Chukchi Sea lease sale planning area.

Shell plans to use two shallow water vessels, based in Kotzebue Sound (photograph of the Diana G , now known as the King C ). These vessels will be used to transport supplies and crew between Kotzebue and the
vessels moored in Kotzebue Sound. These vessels w ill have a shallow draft and be capable of entering shallow

water.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 6 March 2015
Revision 2 Photographs of OSR V

An OSRV such as t he Nanuq (or similar ) will be staged in the vicinity of the drilling units when
either is drilling in liquid hydrocarbon bearing

zones . This will enable the OSRV to immediately respond to a spill and provide containment, recovery, and storage for the initial operational perio d following a spill event.

Photographs of Offshore OSR Tug and Barge

An OSR tug and barge, (photograph of the Guardsman tug and Klamath barge), will be staged in the Chukchi Sea. Together with the OSRV, it will have sufficient containment, recovery, an d storage capacity for the initial operational period in the ev ent of a spill.

Photograph of an OST

Shell plans to use up to two OST s (photo graph of a Panamax tanker). As planned, one OST with specifications of a
Panamax tanker will be staged in the vicinity of the Burger Prospect. This tanker will hold fuel for Shell’s drilling units and support vessels in addition to storage space to store collected recovered liquids if there is a well control event. A second OST, with specifications of an Af ramax tanker, will be stationed in the Chukchi Sea lease sale planning area. The
Aframax tanker will be sited such that it will be able to respond to a well control event before the Panamax tanker reaches its recovered liquid capacity.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 7 March 2015
Revision 2 Photograph of a nearshore Tug and Barge

A tug and barge ( Photograph of the Endeavor barge)
will be used for nearshore OSR. It will car ry a 47 ft

. ( 14 m) skimming vessel, three 34 ft

. (10 m) workboats, four
mini

- barges, boom

, and duplex skimming units for nearshore recovery. This tug and barge will be moored
in or near Goodhope Bay in Kotzebue Sound.

Photogra ph of containment system barge

Shell’s oil spill containment system , housed on the Arctic Challenger barge, will be accompanied by two tugs, likely the Corbin Foss and a similar tug. The containment system tugs and barge will be moored in or near Goodhope Bay in Kotzebue Sound.

Kotzebue Sound Mooring Location

There are four proposed mooring locations for vessels that will be stationed in Goodhope Bay, Kotzebue
Sound. These locations are in the vicinity of the potential place of refuge (PPOR) in the Northwest Alaska Subarea Plan (e.g., approximately 66° 13’ N 163° 28’ W), which is in excess of 7 mi (11 km) from land, in a water depth of approximately 30 ft. (9 m). The proposed mooring locations are:

• Approximately longitude 66 o 13.658’ N and latitude 163 o 28.138’ W

• Approximately longitude 66 o 12.986’ N and latitude 163 o 27.989’ W

• Approximately longitude 66 o 13.037’ N and latitude 163 o 26.305’ W

• Approximately longitude 66 o 13.704’ N and latitude 163 o 26.523’ W

Setting of four mooring buoys is anticipated with each buoy having up to three anchors. The vessels expected to moor in this location include the co ntainment system tug s and barge, nearshore OSR tug and barge, and two supply tugs and barges.

The mooring locations in Goodhope Bay in the western portion of Kotzebue Sound were selected based
on detailed evaluations of environmental and traditional knowle dge information regarding subsistence activities in this area of southwest Kotzebue Sound. The site of these four, closely spaced, temporary mooring locations were selected in large part because the area has been selected and approved by the
State of Alaska as a potential place of refuge (PPOR) in addition to traditional knowledge. The review process for selecting PPORs considers the existence of sensitive resources such as h istoric properties. S S surveys have not been conducted at the location, but it is the conclusion of an archaeological reviewRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 8 March 2015
Revision 2 requested by Shell that there is low potential for any effects to historic resources from the planned moorings and staging in Goodhope Bay. Shell visited the local communities in January 2014 ( Kotzebue), July 2014 (Kotzebue and Deering) and in January 2015 (Kotzebue, Deering and Buckland) and informed local residents of Shell’s proposed activities, including the mooring of vessels in Goodhope Bay, southwest Kotzebue Sound. During these community meetings ( Appendix D ) the residents did not raise concerns that the mooring of the vessels would cause disturbance to subsistence resources or subsistence use. Shell will employ SAs and CLOs in nearby communities to mitigate potential disturbances to
subs istence issues that may arise. In addition, Shell will establish a Communication Center (Com Center) in Kotzebue. The SAs and CLOs will be hired, and the Com Center established prior to Shell vessels entering Kotzebue Sound.

Shell selected the area in larg e part because it has been selected and approved as a PPOR

. The review process for selecting PPORs considers the existence of sensitive resource s such as historic properties. Subsea surveys have not been conducted at the location, but it is the conclusion of an archaeological review requested by Shell that there is low potential for any effects to historic resources from the planned moorings and staging in Goodhope Bay.

Vessels will remain compliant with the existing waste management plan, MARPOL regulation s, and
NPDES Vessel GP for any discharge of gray water or effluent. Crew changes will occur throughout the season using shallow water vessel s (yet to be contracted) transiting out from Kotzebue to the vessel locations in Kotzebue Sound. Vessels may also re ceive resupply of food stores via a shallow water vessel

. Shell plans to refuel the support vessels moored in or near Goodhope Bay, Kotzebue Sound at least once during the drilling season. It is anticipated that the support vessels will require approximate ly 250,000 gal (5,950 bbl) of ULSD (or other fuel with equivalent or lower sulfur content). Refueling will be done with an OSV or other support vessel capable of transferring fuel and will follow the procedures outlined in the
FTP. The shallow water landin g crafts may be fueled dockside at Kotzebue by a commercial entity.

Aircraft

Offshore operations will be serviced by up to three helicopters operated out of an onshore support base in

Barrow

. Sikorsky S

- 92 s ( or similar) will be used to transport crews between the onshore support base and
the drilling units and support vessels with helidecks

. The helicopters will also be used to haul small amounts of food, materials, equipment, samples betw een vessels and the shorebase. Approximately 40

Barrow

- Bur ger Prospect round trip flights will occur each week (up from approximately 12/week in EP Revision 1) to support the additional crew change necessities for another drilling unit and support vessels and required sampling and analytical requirements under th e NPDES exploration facilities GP.

Generalized f light corridors over the onshore and nearshore areas are indicated on Figure 13.e

- 2. The route chosen will depend on weather conditions and whether subsistence users are active on land or at sea.
These routes may be modified depending on weather and subsistence uses.

Shell will also have a dedicated helicopte r for Search and Rescue (SAR). The SAR helicopter is expected
to be a Sikorsk y S

- 92 ( or similar ). This aircraft will stay grounded at the Barrow shorebase location except during training drills, emergencies, and other non

- routine events. The SAR helicopter and crews plan training flights for approximately 40 hr./month.

A fixed wing propeller or turboprop aircraft, such as Saab 340

- B, Beechcraft 1900, or De Havilland Dash 8, will be used to transport crews, materials, and equipment between Wainwright and hub airports such as
Barrow or Fairbanks. Additionally, rotary winged S

- 92s (or similar) in Ba rrow may provide crew transport between Barrow and Wainwright. It is anticipated that there will be one round trip flight every
three weeks.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 9 March 2015
Revision 2 A fixed wing aircraft, Gulfstream Aero Commander (or similar) , will be used for PSO flights (aka
offshore aerial wildlife monitoring flights)

. PSO flights will take place daily depending on weather conditions. PSO flight paths are located in the 4MP (Appendix B).

An additional Gulfstream Aero Commander will be used to provide ice reconnaissance flights to monitor
ic e conditions around the Burger Prospect. Typically, the flights will focus on the ice conditions within 50 mi (80 km) of the drill sites, but more extensive ice reconnaissance may occur beyond 50 mi (80 km). These flights will occur at an altitude of appro ximately 3,000 ft. (915 m).

Fuel Storage Information and Frequency of Trips

The frequencies of trips the above

- referenced marine vessels and aircraft would be expected to make during the planned exploration drilling progr am are listed below in Table 13.a

- 3

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 10 March 2015
Revision 2 Table 13.a

- 3 Fuel Storage Capacity and Trip Information for Support Vessels and Aircraft

Vessel Type Maximum Fuel Tank Storage Capacity (each vessel) Trip Frequency or Duration/Location

Marine Support Vessels (or similar)

Ice management vessels (x2) 14,192 bbl (2,256 m 3 ) Will remain in the vicinity of the drilling
units until its mission is finished

Anchor handler s (x3) 11,318 bbl (1,799 m 3 ) Will remain in the vicinity of the drilling
units until its mission is finished ; may occasionally assist in Kotzebue Sound

OSVs (x3) 5,786 bbl (920 m 3 ) Up to 30 round trips (combined for all OSVs) for resupply between drilling unit and Dutch Harbor/Kotzebue during each exploration drilling season

Supply Tugs (x2) and barges (x2) 4,800 bbl (774 m 3 ) Will generally remain in Kotzebue Sound for storage ; one tug may accompany the Discoverer when transiting to/from a drill site

Support Tugs (x2) 5,585 bbl (888 m 3 ) Support for the Polar Pioneer

Science Vessel (x2) 5,786 bbl (920 m 3 ) Will remain in the vicinity of the drilling
units until its mission is finished

MLC ROV system vessel 6,233 bbl (991 m 3 ) Located on the prospect establishing MLCs ahead of the drilling units

Shallow water vessels (x2) 43 bbl ( 6.8 m 3 ) Occasional trips as needed in vicinity of
Kotzebue OSR Support Vessels (or similar)

OSRV 7,692 bbl (1,223 m 3 ) Will remain in the vicinity of the drilling
units until its mission is finished

OSR tug (x1) and barge (x1) (offshore) 1,786 bbl (284 m 3 ) Will remain in the vicinity of the drilling
units until its mission is finished

OSR tug (x1) and barge (x1) (nearshore) 1,286 bbl (204.5 m 3 ) Staged in Kotzebue Sound

OST (Panamax) 16,121 bbl (2,563 m 3 ) Will remain in the vicinity of the drilling
units until its mission is finished

OST (Aframax) 20,241 bbl (3,218 m 3 ) Stationed in the Chukc hi Sea lease sale planning area

Containment system tug s (x2) and barge (x1) 6,630 bbl (1,054 m 3 ) Staged in Kotzebue Sound

Aircraft (or similar)

Saab 340 B, Beechcraft 1900, or Dash 8
fixed

- wing or similar (x1)

– transport from shorebase to regional jet service in Barrow 9 bbl (1.4 m 3 ) 1 trip every 3 weeks between Wainwright and Barrow or Anchorage

Gulfstream 690 Aero Commander (or similar) (x2) 9 bbl (1.4 m 3 ) PSO flights and ice reconnaissance; both to occur daily when possible

Helicopter S

- 92 (or similar) (x3) for crew rotation & groceries/supply 18 bbl (2.9 m 3 ) Approximately 40 trips/ week between Barrow and the Burger Prospect (approximately 3.0 hr./ trip)

Helicopter S

- 92 (or similar)

– S earch

- and

R escue (x1) 18 bbl (2.9 m 3 ) Stationed in Barrow

– 40 hr./month for proficiency training & trips made in

emergencyRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 11 March 2015
Revision 2 b) Air Emissions

Projected air emissions from support vessels are indicated below in Table 13.b

- 1 and are discussed in more detail in Section 7.0 and Appendix K of this document.

Table 13.b

- 1 Project Annual Air Pollutant Emissions (Tons Per Year) from Support Vessels Associated with the Drilling Units

Vessels NO

x CO PM 10 PM 2.5 VOC SO 2 Ice Management Vessels (x2) 234 79 12 12 11 2
Anchor Handler Vessels (x3) 423 90 18 18 25 3
Science Vessels (x2) 111 45 5 5 10 1 Support Tugs (x2) & Supply Tug (x1) 172 22 6 6 13 1
OSVs (x2) 70 14 7 7 5 1

OSRV 117 44 8 8 6 1
OSR Workboats (x3) 18 5 0.4 0.4 5 0.2 OSR Tug (x1) and Barge (x1) 60 13 3 3 3 0.2 Oil Storage Tanker 156 35 12 12 8 2 MLC ROV system Vessel 145 44 3 3 6 1

Attachment A of Appendix K lists the source, composition, frequency and duration of air emissions associated with support vessels that will be within 25 mi (40 km) of the drilling units while each are anchored at a drilling location.

c) Drilling Fluids and Chemical Products Transpor tation

Each drilling unit will be preloaded with drilling fluids and other chemicals (Section 6.0) to be used for exploration drilling before being mobilized to the Burger Prospect at the start of each exploration drilling season. Any required additional d rilling fluid components will be transported to the drilling unit via an OSV or tug and barge.

d) Solid and Liquid Wastes Transportation

An incinerator will be aboard each drilling unit and will be used to dispose of combustible municipal
solid wastes. Author ized wastes will be discharged to the Chukchi Sea under the NPDES exploration facilities GP. The remaining wastes will be transported out of the Chukchi Sea by OSVs and disposed of at an approved disposal facility. Food wastes associated with the drilling vessels will be incinerated but, if conditions warrant, may be shipped out of the Arctic for disposal at a licensed facility. Descriptions of the transportation methods and a brief description of the composition, quantities, and destinations of the solid

a nd liquid wastes to be transported by vessel from the drilling units are provided below in Table 13.d

- 1.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 12 March 2015
Revision 2 Table 1 3.d

- 1 Onshore Waste Disposal Facilities, Waste Type, Amount, Rate, and Disposal Method

Name/Location of Disposal Facilities Type of Waste Amount Disposal Method

Waste Management Inc. Columbia Ridge Landfill, Arlington, OR (Subtitle D landfill) Household trash (municipal solid waste [MSW]) only Drilling Units: 17,000 lb. (8,500 lb./ month/drilling unit) Support Vessels: 23,454
lb./month Landfill

Waste Management Inc.
Chemical Waste Management, Arlington, OR (Subtitle C landfill) Non

- hazardous waste solids

– including CESQG

- exempt wastes (oily rags, unused chemicals, aerosols, batteries, lamps, cement, incinerator ash, etc.) Drilling Units: 12,100 lb. (6,050 lb./ month/drilling unit

- includes approximately 50 lb./month/ drilling unit of CESQG

- exempt waste) Support Vessels: 4,765
lb./month Landfill or

R ecycle

Marine Vacuum Service Inc. Seattle WA,

- or Emerald Services, Inc., Seattle, WA or Thermo Fluids Portland, OR Non

- hazardous liquids in bulk shipments (bilge water, vessel slops, brine water) Drilling Units: 100,000 lb. (50,000 lb. / month/drilling unit) Support Vessels: 123,975 lb.
/month Treat and R ecycle

Seattle Iron & Metals Corp. Seattle WA, or Schnitzer Steel Industries, Anchorage, AK Non Hazardous Waste
Solids

- Scrap Metal (uncontaminated scrap steel only) Drilling Units: 13,000 lb. (6,500 lb./ month/drilling unit) Support Vessels: 1,220
lb./month Re cycle

e) Vicinity Map and Travel Routes

The locations of the planned exploration drilling activities relative to the shoreline and shorebase facilities and the primary route of the drilling units and routes of support vessels when entering and exiting the Chukchi Sea are indicated in Figure 13.e

- 1. Generalized flight corridors that helicopters would take between the shorebase and the Burger Prospect are indicated in Figure 13.e

- 2. The primary helicopter route between shorebase and the Burger Prospect is fro m the Barrow airport, directly offshore to the Burger Prospect. Helicopters would alternatively travel between Wainwright and the Burger Prospect under special circumstances. The planned use of Wainwright as a shorebase facility is only for the drilling

se asons covered by EP Revision 2, and do not necessarily reflect Shell’s planned shorebase operations in
the extended term.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 13 March 2015
Revision 2 Figure 13.e

- 1 Marine Vessel RoutesRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13

- 14 March 2015
Revision 2 Figure 13.e

- 2 Flight Corridor sRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 1 March 2015
Revision 2 

## SECTION 14.0 ONSHORE SUPPORT FACI LITIES
INFORMATION

a) General

Barrow Facilities

Shell plans to 1) maintain the existing 75

- person man camp and kitchen/dining/recreation (KDR) area; and 2) lease / utilize additional accommodation opportunities in Barrow, which may include an existing
40

- person Ukpeaġvik Iñupiat Corporation (UIC) construction camp. Additional blocks of hotel rooms and other accommodations may be used if required. The two pads where the 75

- person and 40

- person camps are located are in the Naval Arctic Research Laboratory (NARL) area approximately 4.0 mi from the center of Barrow, and are located approximately 0. 75 mi from each other (Figure 14.a

- 1). Passenger processing facility expansion is planned for the Barrow airport area, to be completed prior to the commencement of the next exploration drilling season (Figures 14.a

- 2 and

- 3).

Shell’s 75

- person man camp con sists of skid

- mounted modular buildings. The camp is supported by a KDR unit, capable of providing meals for up to 200 persons, is approximately 166 ft. long by 64 ft. wide and is located on the pad at the southwest corner of the existing accommodations (F igure 14.a

- 4). The KDR provides service to all Shell and contractor employees in Barrow supporting Shell’s exploration drilling program.

The 75

- person camp and KDR unit have been permitted by UIC with the NSB with a Development Permit and a fill permit, an d with the SOA Fire Marshal. In addition, UIC has obtained a Preapproved Emission Limit (PAEL) from the Alaska Department of Envir onmental Conservation (ADEC). The PAEL establishes an annual limit on diesel fuel usage for the 75

- person camp and KDR unit w hich limits potential emissions below permitting thresholds. No State or Federal permits were required.

The UIC 40

- person construction camp will be relocated by UIC from its existing location in Barrow to a similar sand pad construct ed by the U.S. Navy in 1940’s (Figure 14.a

- 1)

. The modular accommodations owned by UIC are currently unused and reside in Barrow. They will be moved to the pad and installed on

p ad pilings. Permitting of this facility is not Shell’s responsibility as the facilities are not Shell’s

. Shell will only lease the facilities once installed at the new location.

Solid and liquid wastes that will be generated by these facilities are discus sed in Section 14 c).

Wainwright Facilities

Shell reserves rooms at the existing Olgoonik Oil Field Services Camp in Wainwright (Figure 14.a

- 5)

. Shell’s OSR group will be house d and fed at these facilities. Shell may utilize a larger camp of up to 55 accommodations to accommodate certain contingencies such as Shell conducting crew changes through Wainwright, or onshore envi ronmental studies in the area. At this time this would involve only the potential reservation of additional rooms.

An existing se cure yard approximately 100’ x 300’ has been leased from Olgoonik Oilfield Services, owned by Olgoonik Corporation, for storage of OSR equipment and load staging for the marine vessels in Wainwright. An additional existing yard space approximately 150 ft. x 200 ft. has been leased f rom Olgoonik Oilfield Services , owned by Olgoonik Corporation

, for additional response equipment stora ge.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 2 March 2015
Revision 2 Kotzebue Facilities

To service vessels moored in Goodhope Bay ( Kotzebue Sound ), Shell will conduct crew change s between
the vessels via Kotzebue

. In addition to these vessels, Kotzebue Sound may also be used to resupply and crew change OSVs. Shell may utilize approximately 25 rooms in Kotzebue. Shell will lease storage facilities for groceries and materials in Ko tzebue

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 3 March 2015
Revision 2 Figure 14.a

- 1 Barrow Camp LocationsRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 4 March 2015
Revision 2 Figure 14.a

- 2 Barrow Hangar and Passenger Processing FacilityRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 5 March 2015
Revision 2 Figure 14.a

- 3 Barrow Proposed Passenger Processing Facility ExpansionRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 6 March 2015
Revision 2 Figure 14.a

- 4 Barrow 75 Man Camp LocationRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 7 March 2015
Revision 2 Figure 14.a

- 5 Wainwright Camp LocationRevised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 8 March 2015
Revision 2 b) Air Emissions

Air emissions are attributable to the operation of the man camp, airport facilities and vehicle use in Barrow, Alaska . Table 14.b

- 1 provides the anticipated hourly air emissions associated with the onshore
facilities in Barrow. T able 14.b

- 2 provid es the anticipated seasonal (or annual) air emissions associated
with the Barrow onshore facilities. Shell will have oil spill contingency response personnel stationed in Wainwright but there are no planned major activities that will contribute to air emis sions. Shell onshore support activities in Kotzebue will utilize existing infrastructure and therefore will not contribute to air
emissions beyond normal use

. Appendix K provides a detailed explanation of the activities and lists the source, composition, f requency and duration of air emissions.

Table 14.b

- 1 Hourly Air Emissions Associated with Onshore Facilities in Barrow, Alaska

Emission Unit NO X lb./hr. CO
lb./hr. PM 10 lb./hr. PM 2.5 lb./hr. VOC
lb./hr. SO 2 lb./hr.

Aircraft Support 5.2 33.5 1.1 1.1 24.8 1.5
Hangar/Storage Building 0.5 0.4 3.7E

- 2 3.7E

- 2 2.7E

- 2 2.9E

- 3

NARL Man Camp 17.6 6.8 0.5 0.5 2.3 0.1

Vehicles 1.3E

- 2 1.1E

- 2 4.5E

- 5 4.5E

- 5 1.7E

- 3 3.4E

- 5

Table 14.b

- 2 Annual Air Emissions Associated with Onshore Facilities in Barrow, Alaska

Emission Unit NO X ton/year CO ton/year PM 10 ton/year PM 2.5 tons/year VOC ton/year SO 2 ton/year

Aircraft Support 0.6 4.3 0.1 0.1 4.4 0.2
Hangar/Storage Building 0.4 0.3 2.7E

- 2 2.7E

- 2 1.9E

- 2 2.1E

- 3

NARL Man Camp 29.2 8.2 0.7 0.7 2.6 0.2

Vehicles 5.7E

- 3 4.3E

- 3 2.6E

- 5 2.6E

- 5 6.3E

- 4 2.0E

- 5Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 9 March 2015
Revision 2 c) Unusual Solid and Liquid Wastes

Barrow Facilities

Blackwater (sewage) and graywater (showers, kitchen) from the two camps will be held in holding tanks
at each site. Based o n a camp occupancy of 100 percent of capacity, and average per capita waste generation factors provided by the local utility, S hell expects to generate about 2,300 gal of combined
blackwater and graywater wastes per day. These wastes will be picked up by the NSB during routine

ser vice and treated in their waste water plant. These wastes generated by camps with temporary population of 115 persons, will not tax Barrow’s municipal wastewater treatment system, which accommodates a population of over 4,000 people, and consists of a seri es of large water treatment lagoons.

Household trash from the camps will be stored in bear proof containers or areas for all locations. These household wastes will be set up for collection by NSB’s regular dumpster service, and will be disposed of
at the N SB Landfill. Shell estimates, based on 2012 Barrow operations and accounting for the additional planned camp accommodations, that the two man camps may generate up to 600 cubic yards (cu yd) of household trash per season, which represents less than 1.3 per cent of the average annual volume s disposed of at the landfill.

Non

- household waste generated at the camps will be st ored in a 20 ft

. shipping container set up as a waste accumulation area located behind the primary camp. The accumulation area will hold an y hazardous, non

hazardous and liquid wastes. All of Shell’s Barrow facilities are operated as a CESQGs of Hazardous

W aste by the EPA, and therefore a permit is not required and hold times do not apply. These wastes will be transported out of the Arctic an d disposed of at licensed facilities.

Wainwright Facilities

With the exception of food waste from the camp kitchen, all wastes generated at the Wainwright camp (Figure 14.a

- 5 ) will be containerized and transported out of the Arctic to a licensed facility

. Food wastes from the kitchen will be dispos ed in the Wainwright landfill. This approach to waste handling will minimize the impact to the community, including the landfill. Based on water usage information provided by the Alaska Department of Environmenta l Conservation ( ADEC ) website, it is estimated that Shell’s
OSR group housed in Wainwright will generate less than 200 gal of black and gray water per day on

average. This equates to approximately 2% of the estimated average generation rate for the entire village, based on a 2012 population of 575.

All wastes generated at the Wainwright OSR y ard will be containerized and transported out of the Arctic to an approved disposal facility. This approach to waste handling will minimize the impact to the community , including the landfill.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14

- 10 March 2015
Revision 2 Kotzebue Facilities

Waste generated on the marine vessels supporting Shell’s operations in Kotzebue Sound will be collected, segregated, stored, labeled and manifested onboard the vessels in accordance with each vessel’s Waste Management Plan. Each vessel will store household waste in super sacks, which will be removed, as needed, in coordination with resupplies and transported to the Port of Kotzebue. The household trash will be unloaded to dedicated dumpsters for transportati on to the Kotzebue landfill. All other waste will remain on the vessels to be containerized and transported to a Shell approved disposal facility in the
Pacific Northwest at the end of the season. All hazardous waste will be consolidated, stored and

tran sported to an approved subtitle C landfill at the end of the season.

While operating in Kotzebue Sound

, all vessel s will discharge effluent within compliance of USCG regulations and the Vessel GP

. Shell does not plan to generate waste onshore in Kotzebue as there are no dedicated camps or facilities

. Shell plans to have support personnel staying at local hotels, but wastes generated would be managed by
the hotel.

d) Waste Disposal

The anticipated volumes and types of wastes that may be ge nerated by the exploration drilling program and transported to shore for disposal , along with the disposal location/facility, are indicated in Table 13

. d

1.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 15

- 1 March 2015
Revision 2 

## SECTION 15.0 COASTAL ZONE MANAGEM ENT ACT

The State of Alaska did not pass legislation required to extend the Alaska Coastal Management Program ( ACMP ) , allowing the ACMP to sunset at 12:01 AM, Alaska Standard Time, on 1 July 2011. Therefore

no Coastal Project Questionnaire and Certification Statement or Other Information required as part of the Coastal Zone Management Act ( CZMA ) is provided

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 16

- 1 March 2015
Revision 2 

## SECTION 16.0 ENVIRONMENTAL IMPACT ANALYSIS

The EIA is provided in Appendix C

.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 17

- 1 March 2015
Revision 2 

## SECTION 17.0 ADMINISTRATIVE

Exempted Information (public information copies only)

The following information is considered proprietary and has been removed from the public copies of the

EP Revision 2 :

• Bottomhole location, TVD and MD of proposed wells in the Form 137 OCS Plan Information Forms (Appendix A)

• All of Section 3 including :

o Geologic descriptions, surface location & bathymetry maps (Section 3.a)

o Structure contour maps (Section 3.b)

o Key seismic lines (Section 3.c)

o Geologic cross

- section maps (Section 3.d)

o Shallow hazards reports (Section 3.e)

o Shallow hazards assessme nts (Section 3.f)

o High resolution seismic lines (Section 3.g)

o Stratigraphic columns (Section 3.h)

o Time/depth tables (Section 3.i)

o Geochemical information (Section 3.j)

o Future G&G activities (Section 3.k)

o Basis for calculation of WCD (Section 3.l)Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 18

- 1 March 2015
Revision 2 

## SECTION 18.0 BIBLIOGRAPHY

Appendix C, EIA has its own bibliography describing study reports, survey reports or other material used.

AECOM, Inc. 2009a. Wainwright near

- term ambient air quality monitoring program first quarter data report November 2008 through January 2009 final. Unpublished report prepared by AECOM, Inc., for ConocoP hillips Alaska, Inc., Anchorage, AK.

AECOM, Inc. 2009b. Wainwright near

- term ambient air quality monitoring program second quarter data report February through April 2009 final. Document No. 01865

- 104

- 3220 prepared by AECOM, Inc., for ConocoPhillips Alask a, Inc., Anchorage, AK.

AECOM, Inc. 2009c. Wainwright near

- term ambient air quality monitoring program third quarter data report May through July 2009 final. Document No. 01865

- 104

- 3230 prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK.

AECOM, Inc. 2009d. Wainwright near

- term ambient air quality monitoring program fourth quarter data report August through October 2009 final. Document No. 60136620

- 3240 prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK.

AECOM, Inc

. 2010a. Wainwright near

- term ambient air quality monitoring program annual data report November 2008 through November 2009 final. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK.

AECOM, Inc. 2010b. Wainwright per manent ambient air quality monitoring program first quarter data report January through March 2010 final. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK.

AECOM, Inc. 2010c. Wainwright permanent ambient air qual ity monitoring program second quarter data report April through June 2010 draft. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK.

AECOM, Inc. 2010d. Wainwright permanent ambient air quality monitoring program th ird quarter data report July through September 2010 draft. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK.

AECOM, Inc. 2011a. Wainwright permanent ambient air quality monitoring program fourth quarter data

repo rt October through December 2010 draft. Unpublished report prepared by AECOM, Inc., for ConocoPhillips Alaska, Inc., Anchorage, AK.

AECOM, Inc. 2011b. Wainwright permanent ambient air quality monitoring program annual data report January 2010 through Dece mber 2010 final. Unpublished report prepared by AECOM, Inc. for ConocoPhillips Alaska, Inc. Anchorage, Alaska.

Aerts, L.A.M., W. Hetrick, S. Sitkiewicz, C. Schudel, D. Snyder, and R. Gumtow. 2013. Marine mammal
distribution and abundance in the northeaster n Chukchi Sea during Summer and early fall, 2008

- 2012. Final Report prepared by LAMA Ecological for ConocoPhillips Company, Shell Exploration and Production Company and Statoil USA E&P, Inc.

Aerts, L.A.M., C.L. Christman, C.A. Schudel, W. Hetrick, and D. S nyder. 2014. Marine mammal distribution and abundance in the northeastern Chukchi Sea from shipboard surveys during summer and early fall, 2008

– 2013. Final report prepared by LAMA Ecological, Anchorage, AK for ConocoPhillips Company, Shell Exploration & Pr oduction Company, and Statoil USA E&P, Inc., Anchorage, AK. 71 pp.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 18

- 2 March 2015
Revision 2 ASRC Energy Services. 2009. Subsistence advisor program summary, North Slope, Alaska . Report prepared for Shell Exploration and Production Company, Houston, TX by ASRC Energy Services, Anchorage, AK.

ASRC Energy Services. 2010. 2009 Subsistence advisor program annual summary North Slope, Alaska. Prepared for Shell Exploration and Production Company. Anchorage, AK. by ASRC Energy Services, Anchorage, AK. December 2009.

Bisson, L.N., H.J. Reider, H.M. Patterson, M. Austin, J.R. Brandon, T. Thomas, and M.L. Bourdon. 2013. Marine mammal monitoring and mitigation during exploratory drilling by Shell in the Alaskan Chukchi and Beaufort Seas, July

– November 2012: Draft 90

- Day Report. D.W. Fu nk, C.M. Reiser, and W.R. Koski, editors. LGL Rep. P1272D

– 1. Rep. from LGL Alaska Research Associates Inc., Anchorage, AK, USA, and JASCO Applied Sciences, Victoria, BC, Canada, for Shell Offshore Inc., Houston, TX, USA, National Marine Fisheries Service, Silver Spring, MD, USA, and U.S. Fish and Wildlife Service, Anchorage, AK, USA. 266 p. + app.

Blanchard, A.L., and A. Knowlton. 2013. Chukchi Sea Environmental Studies Program 2008

- 2012: Benthic Ecology of the Northeastern Chukchi Sea. Final report prepare d by Institute of Marine Sciences, University of Alaska Fairbanks for ConocoPhillips Company, Shell Exploration and Production Company and Statoil USA E&P, Inc.

Blanchard, A., H. Nichols, and C. Parris. 2010a. Benthic ecology of the Burger and Klondike su rvey areas: 2008 environmental studies program in the Chukchi Sea. Annual Report prepared for ConocoPhillips Alaska Inc., Anchorage, AK and Shell Exploration & Production Company, Anchorage, AK, by the Institute of Marine Science, University of Alaska, Fa irbanks. 72 pp.

Blanchard, A., C. Parris, and H. Nichols. 2010b. Benthic ecology of the Burger and Klondike survey areas: 2009 environmental studies program in the northeastern Chukchi Sea. Annual Report prepared for ConocoPhillips Alaska Inc., Anchorage , AK, Shell Exploration & Production Company, Anchorage, AK, and Statoil USA E&P, Anchorage, AK by the Institute of Marine Science, University of Alaska, Fairbanks. 86 pp.

Boudreau, B. 1989. Biological clearance for Bu rger and Crackerjack Prospects. U.S. G ovt. Memorandum, from Regional Supervisor, Field Operations, Minerals Management Service, Alaska OCS Region to District Office Supervisor.

Brueggeman, J. 2009. Marine mammal surveys at the Klondike and Burger survey areas in the Chukchi
Sea duri ng the 2008 open water season. Prepared for ConocoPhillips Alaska, Inc. and Shell Exploration and Production, Anchorage, AK by Canyon Creek Consulting LLC, Seattle, WA. 46

pp.
Brueggeman, J. 2010. Marine mammal surveys at the Klondike and Burger survey areas in the Chukchi
Sea duri ng the 2009 open water season. Prepared for ConocoPhillips Alaska, Inc. and Shell Exploration and Production, Anchorage, AK by Canyon Creek Consulting LLC, Seattle, WA. 55

pp.

Delarue, J., J. Vallarta, H. Frouin

- Mouy, J. Wladichuk, B. Mart in, X. Mouy, and D. Hannay. 2013. Northeastern Chukchi Sea Joint Acoustic Monitoring Program 2011

– 2012. JASCO Document 00533, Version 3.0. Technical report for ConocoPhillips Company, Shell Exploration & Production Company, and Statoil USA E&P, Inc. by JAS CO Applied Sciences.

Dunton, K.H, J.M. Grebmeier and J.H. Trefry (eds.). 2014. Deep Sea Research Part II: Topical Studies in Oceanography. The Northern Chukchi Sea Benthic Ecosystem: Characterization, Biogeochemistry and Trophic Linkages. Volume 102, pages 1

- 164 (April 2014).Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 18

- 3 March 2015
Revision 2 Exponent, Inc. 2010. Chukchi Sea environmental studies baseline program 2009 fish sampling

– chemistry results. Final Report prepared for ConocoPhillips Alaska Inc., Anchorage, AK, Shell Exploration & Production Company, Anchorage , AK, and Statoil USA E&P Inc., Anchorage by Exponent Inc. 60 pp. plus app.

Finney, H. 1989. Summary: Biological reconnaissance, Burger Prospect, Sale 109, Chukchi Sea,
Alaska. Unpublished Report submitted by H. Finney, Fugro

- McClelland Marine Geoscienc es, Inc., Houston, Texas to Shell Western E&P Inc., Houston Texas.

Fugro GeoConsulting, Inc. 2010a. Shallow Hazards and Archaeological Assessment Burger Site Survey 1 OCS Lease Sale 193 area Chukchi Sea, Alaska. Report No. 27.2009

- 2327 v. 1 & 2, prepared by Fugro GeoConsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Fugro GeoConsulting, Inc. 2010b. Drill Site Clearance Letter Proposed Burger A Drill Site Block 6764
OCS

- Y

- 2280 Posey Area, Chukchi Sea, Alaska. Report No. 27.2010

- 23 75

- 1 prepared by Fugro GeoConsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Fugro GeoConsulting, Inc. 2010c. Drill Site Clearance Letter Proposed Burger F Drill Site Block 6714
OCS

- Y

- 2267 Posey Area, Chukchi Sea, Alaska . Report No . 27.2010

- 2375

- 3 prepared by Fugro GeoConsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Fugro GeoConsulting, Inc. 2010d. Drill Site Clearance Letter Proposed Burger S Drill Site Block 6762
OCS

- Y

- 2278 Posey Area, Chukchi Sea, Alaska . Report No. 27.2010

- 2375

- 4 prepared by Fugro GeoConsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Fugro GeoConsulting, Inc. 2010e. Shallow Hazards and Archaeological Assessment Burger Site Survey
3 OCS Lease Sale 193 Area Chukch i Sea, Alaska. Report No. 27.2010

- 2342 prepared by Fugro GeoConsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Fugro GeoConsulting, Inc. 2010f. Drill Site Clearance Letter Proposed Burger V Drill Site Block 6915
OCS

- Y

- 2324 Posey A rea, Chukchi Sea, Alaska. Report No. 27.2010

- 2375

- 6 prepared by Fugro GeoConsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Fugro GeoConsulting, Inc. 2011a. Shallow Hazards and Archaeological Assessment Burger Site Survey
4 OCS Le ase Sale 193 Area Chukchi Sea, Alaska. Report No. 27.2010

- 2343, v. 1 & 2, prepared by Fugro GeoConsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Fugro GeoConsulting, Inc. 2011b. Drill Site Clearance Letter Proposed Burger R Drill Site Block 6812
OCS

- Y

- 2294 Posey Area, Chukchi Sea, Alaska. Report No. 27.2010

- 2375

- 7 prepared by Fugro GeoConsulting, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston, TX.

Funk, D. W., R. Rodrigues, D. S. Ireland, and W. R. Koski (eds.). 2007. Joint Monitoring Program in the Chukchi and Beaufort Seas, July

- November 2006. LGL Alaska Report P891

- 2, Report from LGL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., Bioacoustics Research Program, Cornell University, and Bio

- Wav e Inc. for Shell Offshore, Inc., ConocoPhillips Alaska, Inc., and GX Technology, and National Marine Fisheries Service, U.S. Fish and Wildlife Service. 316 pp. plus Appendices.

Funk, D., D Hannay, D. Ireland, R. Rodrigues, W. Koski. (eds.) 2008. Marine mammal monitoring and mitigation during open water seismic exploration by Shell Offshore Inc. in the Chukchi and Beaufort Seas, July

– November 2007: 90

- day report. LGL Rep. P969

- 1. Rep. from LGL Alaska Research Associates Inc., LGL Ltd., and JASCO Researc h Ltd. for Shell Offshore Inc., National Marine Fisheries Service, and U.S. Fish and Wildlife Service. 218 pp plus appendices.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 18

- 4 March 2015
Revision 2 Funk, D.W., D.S. Ireland, R. Rodrigues, and W.R. Koski (eds .). 2010. Joint Monitoring Program in the Chukchi and Beaufort seas, open

- water seasons, 2006

– 2008. LGL Alaska Report P1050

- 3, Report from LGL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., and JASCO Research, Ltd., for Shell Of fshore, Inc. and Other Industry Contributors, and National Marine Fisheries Service, U.S. Fish and Wildlife Service. 499 p. plus Appendices.

Funk, D.W., D.S. Ireland, R. Rodrigues, and W.R. Koski (eds.). 2011. Joint Monitoring Program in the
Chukchi and Be aufort seas, open

- water seasons, 2006

– 2009. LGL Alaska Report P1050

- 2, Report from LGL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., and JASCO Applied Sciences, for Shell Offshore, Inc. and Other Industry Contributors, and Nationa l Marine Fisheries Service, U.S. Fish and Wildlife Service.

Funk, D.W., C.M. Reiser, D.S. Ireland, R. Rodrigues, and W.R. Koski (eds.). 2013. Joint Monitoring Program in the Chukchi and Beaufort seas, 2006

– 2010. LGL Alaska Final Report P1213

- 2, Report f rom LGL Alaska Research Associates, Inc., LGL Ltd., Greeneridge Sciences, Inc., and JASCO Research, Ltd., for Shell Offshore, Inc. and Other Industry Contributors, and National Marine Fisheries Service, U.S. Fish and Wildlife Service. 592 p. plus Appendice s.
Gall, A. and R. Day. 2009. Distribution and abundance of seabirds in the northeastern Chukchi Sea, 2008. Final Report prepared for ConocoPhillips Alaska Inc., Anchorage, AK and Shell Exploration & Production Company, Anchorage, AK by ABR, Inc.

– Envir onmental Research & Services, Fairbanks, AK. 55 pp.

Gall, A. and R. Day. 2010. Distribution and abundance of seabirds in the northeastern Chukchi Sea,
2008

- 2009. Prepared for ConocoPhillips Alaska Inc., Anchorage, AK, Shell Exploration &
Production Company, Anchorage, AK, and Statoil USA E&P, Inc., Anchorage, AK by ABR, Inc.

– Environmental Research & Services, Fairbanks, AK. 68 pp.

Gall, A.E, R.H. Day, and T.C. Morgan. 2013. Distribution and Abundance of Seabirds in the Northeastern Chukchi Sea, 200 8

- 2012. Final report prepared by ABR Inc. for ConocoPhillips Company, Shell Exploration and Production Company and Statoil USA E&P, Inc.

Gall A., T.C. Morgan, and B. Day. 2014. Distribution and Abundance of Seabirds in the Northeastern Chukchi Sea, 2008

- 2013. Prepared for ConocoPhillips Company, Shell Exploration & Production Company, and Statoil USA E&P, Inc., Anchorage AK by ABR, Inc. Environmental Services, Fairbanks, AK. 94 pp.

GEMS (Geoscience Earth & Marine Services, Inc.) 2009. Shallow Hazards a nd Archaeological Assessment, Burger J Drill Site Posey Block NR03

- 02 6912, Chukchi Sea, Alaska . Prepared by Geoscience Earth & Marine Services, Inc., Houston, TX for Shell Gulf of Mexico Inc., Houston,
TX.

Goodman, S.E., J. June, K. Antonelis and A. Anto nelis. 2013. Acoustic Survey of Fishes in the Chukchi Sea Environmental Studies Program in 2012. Final report prepared by Natural Resources Consultants, Inc. for Olgoonik Fairweather, LLC.

Hopcroft, B, J. Questel, and C. Clarke

- Hopcroft. 2009. Oceanograp hic assessment of the planktonic communities in the Klondike and Burger survey areas of the Chukchi Sea: report for survey year 2008. Report prepared for ConocoPhillips Alaska Inc., Anchorage, AK and Shell Exploration & Production Company, Anchorage, AK b y the Institute of Marine Science, University of Alaska, Fairbanks. 52 pp.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 18

- 5 March 2015
Revision 2 Hopcroft, B, J. Questel, and C. Clarke

- Hopcroft. 2010. Oceanographic assessment of the planktonic communities in the Klondike and Burger survey areas of the Chukchi Sea: report for survey year 2009. Report prepared for ConocoPhillips Alaska Inc., Anchorage, AK, Shell Exploration & Production Company, Anchorage, AK, and Statoil USA Exploration & Production Company, Anchorage, AK by the Institute of Marine Science, University of A laska, Fairbanks. 54 pp.

Hopcroft, R., J. Questel, and C. Clarke

- Hopcroft. 2011. Oceanographic assessment of the planktonic communities in the northeastern Chukchi Sea: report for survey year 2010. Prepared for ConocoPhillips Alaska, Inc., Shell Exploratio n & Production Company, and Statoil E&P USA, Anchorage, AK by the Institute of Marine Science, University of Alaska, Fairbanks.

Hopcroft, R., J. Questel, P. Hariharan, C. Stark, and C. Clarke

- Hopcroft. 2012. Oceanographic assessment of the planktonic commu nities in northeastern Chukchi Sea: report for survey year 2011. Prepared for ConocoPhillips Alaska, Inc., Shell Exploration & Production Company, and Statoil E&P USA, Anchorage, AK by the Institute of Marine Science, University of Alaska, Fairbanks.

Hopcr oft, R.R., P. Hariharan, J. Questal, J. Lamb, E. Lessard, M. Foy and C. Clarke

- Hopcroft. 2013. Oceanographic assessment of the planktonic communities in the northeastern Chukchi Sea. Final Report prepared by Institute of Marine Sciences, University of Alas ka Fairbanks and School of Oceanography, University of Washington Seattle for ConocoPhillips Company, Shell Exploration and Production Company and Statoil USA E&P, Inc.

Hopcroft R.R and R.H. Day (eds). 2013. Continental Shelf Research. Seasonal and interan nual dynamics of the northeastern Chukchi Sea Ecosystem. Volume 67, pages 1

- 166 (15 September 2013).

Hopcroft, R., J. Questel, J. Lamb, and C. Clarke

- Hopcroft. 2014 . Oceanographic assessment of the planktonic communities in northeastern Chukchi Sea: report for survey year 201 3 . Prepared for ConocoPhillips Alaska, Inc., Shell Exploration & Production Company, and Statoil E&P USA, Anchorage, AK by the Institute of Marine Science, University of Alaska, Fairbanks.

Ireland, D.S., D.W. Funk., R. Rodrigues, and W. R. Koski (eds.). 2009. Joint Monitoring Program in the Chukchi and Beaufort seas, open water seasons, 2006

– 2007. LGL Alaska Report P971

– 2, Report from LGL Alaska Research Associates, Inc., Anchorage, AK, LGL Ltd., environmental research associates, King City, Ont., JASCO Research, Ltd., Victoria, BC, and Greeneridge Sciences, Inc., Santa Barbara, CA, for Shell Offshore, Inc., Anchorage, AK, ConocoPhillips Alaska, Inc., Anchorage, AK, and the National Marine Fisheries Service, Silver Springs, MD, and the U.S. Fish and Wildlife Service, Anchorage, AK. 485 p. plus Appendices.

Ireland, D.S., R. Rodrigues, D. Funk, W. Koski, D. Hannay. (eds.) 2009. Marine mammal monitoring and mitigation during open water seismic exploration by Shell Offshore Inc. in the Ch ukchi and Beaufort Seas, July

– October 2008: 90

- day report. LGL Rep. P1049

- 1. Rep. from LGL Alaska Research Associates Inc., LGL Ltd., and JASCO Research Ltd. for Shell Offshore Inc., National Marine Fisheries Service, and U.S. Fish and Wildlife Service. 277 pp, plus appendices.

LGL Alaska Research Associates, Inc., JASCO Applied Sciences, Inc., and Greeneridge Sciences, Inc. 2013. Joint Monitoring Program in the Chukchi and Beaufort Seas, 2012. LGL Alaska Report
P1272

- 2 for Shell Offshore, Inc. ION Ge ophysical, Inc., and Other Industry Contributors, National Marine Fisheries Service, and U.S. Fish and Wildlife Service. 320 p. plus Appendices.

LGL Draft Rep. P891

- 1. Rep. from LGL Alaska Research Associates Inc., Anchorage, AK, LGL Ltd., King City, Ont ., and Greeneridge Sciences Inc., Goleta, CA, for Shell Offshore Inc., Houston, TX, and National Marine Fisheries Service, Silver Spring, MD. 199 p.Revised Outer Continental Shelf Lease Exploration Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 18

- 6 March 2015
Revision 2 Mathis, J.T. 2013. Seasonal Observations of carbonate chemistry and ocean acidification in 2012. Final

r eport prepared by Ocean Acidification Research Center, University of Alaska Fairbanks for ConocoPhillips Company., Shell Exploration and Production Company and Statoil USA E&P,
Inc.

Mathis, J.T. and N.M. Monacci. 2014. Seasonal Observations of Carbonate C hemistry and Ocean Acidification in the Northeastern Chukchi Sea in 2013. Prepared for ConocoPhillips Company, Shell Exploration and Production Company, Statoil USA E&P, Inc. by Ocean Acidification
Research Center. School of Fisheries and Ocean Sciences. University of Alaska Fairbanks. August 2014.

Neff, J., G. Durell, J. Trefry, and J. Brown. 2010. Environmental studies in the Chukchi Sea 2008: chemical characterization. Final Report prepared for ConocoPhillips Alaska Inc., Anchorage, AK
and Shell Ex ploration & Production Company, Anchorage, AK by Battelle Memorial Institute, Exponent Inc., Florida Institute of Technology, and NMFS & Associates.135 pp.

NMFS. 2013. Draft guidance for assessing the effects of anthropogenic sound on marine mammals:

acous tic threshold levels for onset of permanent and temporary threshold shifts. NOAA draft report, 23 December 2013.

Northern Economics. 2009. Economic analysis of future offshore oil and gas development: Beaufort Sea, Chukchi Sea, and North Aleutian Basin

. Report prepared by Northern Economics, Anchorage Alaska for Shell Exploration and Production, Houston, TX.

Northern Economics, Inc. and Institute of Social and Economic Research. 2011. Potential National

- Level Benefits of Alaska OCS Development. Report pre pared by Northern Economics, Inc. and Institute of Social and Economic Research, Anchorage, AK for Shell Exploration & Production, Anchorage, AK.

Patterson, H., S.B. Blackwell, B. Haley, A. Hunter, M. Jankowski, R. Rodrigues, D. Ireland and D. W.
Funk. 2007. Marine mammal monitoring and mitigation during open water seismic exploration by Shell Offshore Inc. in the Chukchi and Beaufort Seas, July

– September 2006: 90

- day report.

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