UNITED STATES GOVERNMENT MEMORANDUM

To: Public Information (MS 5030)

Plans Section, Office of Field 

Operations (MS 5231)

Public Information copy of Exploration Plan

Control # - S-07526

Type - Supplemental Exploration Plan

Lease(s) - OCS-G24069 Block - 301 Mississippi Canyon Area

Operator - LLOG Exploration Offshore, L.L.C.

Drill, complete, and install subsea wellhead for Well A

SEMISUBMERSIBLE

Attached is a copy of the subject plan for public comments on issues that 

should be addressed in an Environmental Assessment.

It has been deemed submitted as of this date and is under review for approval.

James Webb

Plan Coordinator

Description -

Rig Type -

Subject:

From:

December 12, 2011
LLOG EXPLORATION OFFSHORE, L.L.C. 

1001 Ochsner Boulevard, Suite 200 

Covington, Louisiana 70433 

SUPPLEMENTAL EXPLORATION PLAN 

OCS-G-24069 

MISSISSIPPI CANYON BLOCK 301 

PREPARED BY: 

Kathy Gowland 

Regulatory Specialist 

985-801-4300 (Main) 

985-801-4317 (Direct) 

kathygo@llog.com
LLOG EXPLORATION OFFSHORE, L.L.C.

SUPPLEMENTAL EXPLORATION PLAN 

OCS-G-24069 Lease 

Mississippi Canyon Block 301 

APPENDIX A Plan Contents 

APPENDIX B General Information 

APPENDIX C Geological, Geophysical Information 

 

APPENDIX D Hydrogen Sulfide (H2S) Information 

APPENDIX E Biological, Physical and Socioeconomic Information 

APPENDIX F Waste and Discharge Information 

APPENDIX G Air Emissions Information 

 

APPENDIX H Oil Spill Information 

APPENDIX I Environmental Monitoring Information 

APPENDIX J Lease Stipulation Information 

APPENDIX K Environmental Mitigation Measures Information 

APPENDIX L Related Facilities and Operations Information 

APPENDIX M Support Vessels and Aircraft Information 

APPENDIX N Onshore Support Facilities Information 

APPENDIX O Coastal Zone Management Act (CZMA) Information 

APPENDIX P Environmental Impact Analysis 

APPENDIX Q Administrative Information 
APPENDIX A 

PLAN CONTENTS

(30 CFR Part 250.211 and 250.241) 

A. Plan information 

In accordance with 30 CFR 250.211 and 250.241(a),and NTL No. 2008-G04 and NTL 

2010-N06, LLOG Exploration Offshore, LLC proposes supplementing the Initial 

Exploration Plan, Control No. 08413, for the drilling, completion, testing and 

installation of subsea wellhead and/or manifold for one additional proposed location on 

Lease OCS-G-24069, Mississippi Canyon Block 301, Well A. 

Included as Attachment A is Form MMS 137 “OCS Plan Information Form”. 

. 

B. Location 

Attachment B – Well Location Plat 

Attachment C – Bathymetry Map – Seafloor disturbance area 

C. Safety & Pollution Features 

Safety features on the semi-submersible will include well control, pollution prevention, 

welding procedure, and blowout prevention equipment as described in Title 30 CFR 

Part 250, Subparts C, D, E, G & O; and as further clarified by Notices to Lessees, U.S. 

Environmental Protection Agency and the U. S. Coast Guard. The appropriate life rafts, 

life jackets, ring buoys, etc., as prescribed by the U. S. Coast Guard will be maintained 

on the facility at all times. 

D. Storage Tanks and Vessels 

The following table details the storage tanks and/or production vessels that will store 

oil (capacity greater than 25 barrels) and be used to support the proposed activities 

(MODU, barges, platform, etc.): 

Type of 

Storage Tank 

Type of 

Facility 

Tank Capacity 

(bbls) 

Number of 

tanks 

Total Capacity 

(bbls) 

Fluid Gravity 

(API) 

Fuel Oil 

(Marine Diesel) 

SemiSubmersible 95.24 2 190.5 No. 2 Diesel 

2917.8 4 11,671.2 

Total 11,861.7 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 1

 
E. Pollution Prevention Measures 

This section of the plan is not applicable to the proposed operations. 

F. Additional measures: 

No additional measures are proposed. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 2

 
OCS Plan Information Form

Attachment A 

(Public Information) 
U.S. Department of the Interior OMB Control Number: 1010-0151

Minerals Management Service OMB Approval Expires: 12/31/2011

OCS PLAN INFORMATION FORM 

General Information 

Type of OCS Plan: Exploration Plan (EP) Development Operations Coordination Document (DOCD) 

Company Name: MMS Operator Number: 

Address: Contact Person: 

 Phone Number: 

 E-Mail Address: 

Lease(s): Area: Block(s): Project Name (If Applicable): 

Objective(s): Oil Gas Sulphur Salt Onshore Base: Distance to Closest Land (Miles): 

Description of Proposed Activities (Mark all that apply)

Exploration drilling Development drilling 

Well completion Installation of production platform 

Well test flaring (for more than 48 hours) Installation of production facilities 

Installation of caisson or platform as well protection structure Installation of satellite structure 

Installation of subsea wellheads and/or manifolds Commence production 

Installation of lease term pipelines Other (Specify and describe) 

Have you submitted or do you plan to submit a Conservation Information Document to accompany this plan? Yes No 

Do you propose to use new or unusual technology to conduct your activities? Yes No 

Do you propose any facility that will serve as a host facility for deepwater subsea development? Yes No 

Do you propose any activities that may disturb an MMS-designated high-probability archaeological area? Yes No 

Have all of the surface locations of your proposed activities been previously reviewed and approved by MMS? Yes No 

Tentative Schedule of Proposed Activities 

Proposed Activity Start Date End Date No. of Days 

 

 

Description of Drilling Rig Description of Production Platform 

 Jackup Drillship Caisson Tension leg platform

 Gorilla Jackup Platform rig Well protector Compliant tower 

 Semisubmersible Submersible Fixed platform Guyed tower

 DP Semisubmersible Other (Attach Description) Subsea manifold Floating production system 

Drilling Rig Name (If Known): Spar Other (Attach Description) 

Description of Lease Term Pipelines 

From (Facility/Area/Block) To (Facility/Area/Block) Diameter (Inches) Length (Feet) 

 

MMS FORM MMS-137 (December 2008 - Supersedes all previous editions of form MMS-137 which may not be used.) Page 1 of 2
2

OCS PLAN INFORMATION FORM (CONTINUED) 

Include one copy of this page for each proposed well/structure 

Proposed Well/Structure Location

Well or Structure Name/Number (If renaming well or structure, reference previous name): Subsea Completion 

Anchor Radius (if applicable) in feet: Yes No 

Surface Location Bottom-Hole Location (For Wells) 

Lease No. OCS OCS 

Area Name 

Block No. 

Blockline 

Departures 

(in feet)

N/S Departure: F____ L N/S Departure: F____ L 

 E/W Departure: F____ L E/W Departure: F____ L 

Lambert X-Y 

coordinates 

X: X: 

 Y: Y: 

Latitude/ 

Longitude

Latitude Latitude 

Longitude Longitude 

TVD (Feet): MD (Feet): Water Depth (Feet): 

Anchor Locations for Drilling Rig or Construction Barge (If anchor radius supplied above, not necessary) 

Anchor Name 

 or No. 

Area Block X Coordinate Y Coordinate Length of Anchor 

Chain on Seafloor 

 X = Y = 

 X = Y = 

 X = Y = 

 X = Y = 

 X = Y = 

 X = Y = 

 X = Y = 

 X = Y = 

Paperwork Reduction Act of 1995 Statement: The Paperwork Reduction Act of 1995 (44 U.S.C. Chapter 35) requires us 

to inform you that MMS collects this information as part of an applicant’s Exploration Plan or Development Operations 

Coordination Document submitted for MMS approval. We use the information to facilitate our review and data entry for 

OCS plans. We will protect proprietary data according to the Freedom of Information Act and 30 CFR 250.197. An 

agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays 

a currently valid Office of Management and Budget Control Number. The use of this form is voluntary. The public 

reporting burden for this form is included in the burden for preparing Exploration Plans and Development Operations 

Coordination Documents. We estimate that burden to average 600 hours per response, or 640 with an accompanying EP 

(1,000 hours in AKOCSR), or 690 (1,700 in AKOCSR) with an accompanying DPP or DOCD, including the time for 

reviewing instructions, gathering and maintaining data, and completing and reviewing the forms associated with subpart B. 

Direct comments regarding the burden estimate or any other aspect of this form to the Information Collection Clearance 

Officer, Mail Stop 5438, Minerals Management Service, 1849 C Street, NW., Washington, DC 20240.

 

MMS FORM MMS-137 (December 2008 - Supersedes all previous editions of form MMS-137 which may not be used.) Page 2 of 2
Well Location Plats

Attachment B 

(Public Information) 
LLOG EXPL OFFSHORE

Mississippi Canyon Block 301

Gulf of Mexico

LOCATION MAP

9/11

Geo: Eric Zimmermann

PUBLIC

0’ 1000’ 2000’

LLOG EXPLORATION OFFSHORE, INC.

OCS-G 24069

MC 301

SURFACE LOCATION A:

X: 1,271,302.00 Y: 10,417,170.00

Lat: 28 deg, 42 min, 01.379 sec

Long: 88 deg, 09 min, 06.2160sec

4,102’ FWL 5,550’ FNL

(NAD27)

Surface

Loc A

X= 1,267, 200

X= 1,283,040

Y= 10,422,720

Y= 10,406,880
Bathymetry Map

Attachment C 

(Public Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 5

 
MC 301 Figure W-1 Seafloor rendering with maximum anchor radius

G08807 #1 MC 301-A

MC 258

MC 300 MC 302

MC 301

MC 344 MC 345 MC 346

MC 256 MC 257

Mobile

Dome

1 MILE

MISSISSIPPI 

CANYON 

AREA

Mitchell 

Dome

Dauphin

Dome

MC 301-A

Circle represents 

1,000’ buffer from 

maximum anchor 

radius

Existing

Circle represents 

15,500’ maximum 

anchor radius 

circle around well

Wells

Infrastructure

Proposed

Circle represents 2,000’ 

radius circle around well

(per NTL 2009-G40)

Communications Cable, active

Expulsion Mounds

Feature

Bathymetry (bsl)
APPENDIX B 

GENERAL INFORMATION

(30 CFR Part 250.213 and 250.243) 

A. Applications and Permits

There are no Federal/State applications to be submitted for the activities provided for in 

this Plan (exclusive to BOEMRE permit applications and general permits issued by the 

EPA and COE) 

Application/Permit Issuing Agency Status 

N/A 

B. Drilling Fluids

Type of Drilling Fluid Estimated Volume of Drilling Fluid to 

be used per Well 

Water Based (seawater, freshwater, barite) See Appendix F, Table 1 of this Plan 

Oil–based (diesel, mineral oil) N/A 

Synthetic-based (internal olefin, ester) See Appendix F, Table 2 of this Plan 

C. New Or Unusual Technology

LLOG does not propose using any new and/or unusual technology for the operations 

proposed this Revised Plan. 

D. Bonding Statement

The bond requirements for the activities and facilities proposed in this Revised EP are 

satisfied by an area wide bond, furnished and maintained according to 30 CFR Part 256; 

subpart I; NTL No. 2006-G16, “Guidelines for General Lease Surety Bonds,” and 

additional security under 30 CFR 256.43(d) and National NTL No. 2003-N06 

“Supplemental Bonding Procedures.” 

E. Oil Spill Responsibility (OSFR)

LLOG Exploration Offshore, L.L.C (MMS Co. No. 02058) will demonstrate oil spill 

financial responsibility for the facilities proposed in this Revised EP according to 30 

CFR Part 253, and NTL 99-N01, “Guidelines for Oil Spill Financial Responsibility for 

Covered Facilities.” 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 6

 
F. Deepwater Well Control Statement

LLOG Exploration Offshore, L.L.C. (MMS Co. No. 02058) has the financial capability 

to drill a relief well and conduct other emergency well control operations. 

G. Blowout Scenario

See the following Blowout Scenario including Site Specific Proposed Relief Well and 

Intervention Planning and Relief Well Response Time Estimate – Attachment D. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 7

 
NTL 2010-N06 Data 

Attachment D 

(Public Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 8

 
BLOWOUT SCENARIO 

Pursuant with 30 CFR 250.213(g), 250.219, 250,250 and NTL 2010-N06 the following attachment provides a 

blowout scenario description, information regarding any oil spill, WCD results and assumptions of potential spill 

and additional measures taken to firstly enhance the ability to prevent a blowout and secondly to manage a 

blowout scenario if it occurred. 

INFORMATION REQUIREMENTS

PROPOSED PROSPECT INFORMATION

Well Surface Location WD X (NAD 27) Y (NAD 27) Latitude Longitude 

MC 301 OCS-G-24069 6135 1,271,302’ 10,417,170’ 28° 42’ 01.3794” 89° 09’ 06.2164”

INFORMATION REQUIREMENTS

A) Blowout scenario 

The MC 301 to be drilled to potential outlined in the Geological and Geophysical Information Section of this 

plan utilizing a typical subsea wellhead system, conductor, surface and intermediate casing strings from a 

new wellbore and a MODU rig with marine riser and a subsea BOP system. A hydrocarbon influx and a well 

control event occurring from the objective sand is modeled with no drill pipe or obstructions in the wellbore 

followed by a failure of the subsea BOP’s and loss of well control at the seabed. The simulated flow and 

worst case discharge (WCD) results for all wells are calculated and the highest WCD is used for this 

unrestricted blowout scenario. 

B) Estimated flow rate of the potential blowout 

Category Revised EP 

Type of Activity Drilling / Completion Ops 

Facility Location (area / block) MC 301 

Facility Designation MODU 

Distance to Nearest Shoreline (miles) ~62 

Uncontrolled Blowout (Volume per day) 110,674 bbls 

Type of Fluid Oil, Gas and Water 

C) Total volume and maximum duration of the potential blowout 

Duration of Flow (days) 104 days total (see Relief Well Response Estimate below) 

Total Volume of Spill (bbls) ~11.5 MMBO based on 99 days of uncontrolled flow 

D) Assumptions and calculations used in determining the worst case discharge 

 Attached to the Proprietary Copy - Omitted from Public Information Copies 

E) Potential for the well to bridge over 

Mechanical failure/collapse of the borehole in a blowout scenario is influenced by several factors including 

in-situ stress, rock strength and fluid velocities at the sand face. Given the substantial fluid velocities 

inherent in the WCD, and the scenario as defined where the formation is not supported by a cased and 

cemented wellbore, it is possible that the borehole may fall/collapse/bridge over within a span of a few days, 

significantly reducing the outflow of the rates. For this blowout scenario, no bridging is considered. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 9

 
F) Likelihood for intervention to stop blowout 

The likelihood of surface intervention to stop a blowout is based on some of the following equipment specific 

to potential MODU’s to be contracted for this well. It is reasonable to assume that the sooner you are able 

to respond to the initial blowout, the better likelihood there is to control and contain the event due to reduced 

pressures at the wellhead, less exposure of well fluids to erode and compromise the well control equipment, 

and less exposure of hydrocarbons to the surface to safeguard personnel and equipment in an emergency 

situation. This equipment includes: 

• Secondary Acoustic BOP Control System – typically fitted on DP MODU’s presently operating in the 

GOM. This system has the ability to communicate and function specific BOP controls from the 

surface in the event of a failure of the primary umbilical control system. This system typically can 

establish BOP controls from the surface acoustic system package on the rig or by deploying a 

second acoustic package from a separate vessel of opportunity. This system may not be included 

on all MODU’s such as 4th generation moored rigs. This system is typically configured to function 

the following: 

- Blind/shear ram close 

- Pipe ram close 

- LMRP disconnect 

• ROV Intervention BOP Control System – includes one or more ROV intervention panels mounted 

on the subsea BOP’s located on the seabed allows a ROV utilizing standard ROV stabs to access 

and function the specific BOP controls. These functions will be tested at the surface as part of the 

required BOP stump test and selectively at the seafloor to ensure proper functionality. These 

function include the following (at a minimum): 

- Blind/shear ram close 

- Pipe ram close 

- LMRP disconnect 

- WH disconnect 

 

• Deadman / Autoshear function – typically fitted on DP MODU’s and but to be on all MODU’s 

operating in the GOM according to new requirements, this equipment allows for an automated preprogrammed sequence of functions to close the casing shear rams and the blind/shear rams in the 

event of an inadvertent or emergency disconnect of the LMRP or loss of both hydraulic and 

electrical supply from the surface control system. 

In the event that the intervention systems for the subsea BOP’s fail, LLOG will initiate call out of a secondary 

containment / surface intervention system supported by the Helix Well Containment Group (HWCG) of 

which LLOG is a member. This system incorporates a capping stack capable of being deployed from the 

back of a vessel of opportunity equipped with a ROV or from the Helix Q4000 DP MODU. Based on the 

potential integrity concerns of the well, a “cap and flow” system can be deployed which may include the 

Helix Producer 1 capable of handling up to 55,000 BOPD flowback. The vertical intervention work is 

contingent upon the condition of the blowing out well and what equipment is intact to access the wellbore for 

kill or containment operations. The available intervention equipment may also require modifications based 

on actual wellbore conditions. Standard equipment is available through the Helix Deepwater Containment 

System to fit the wellhead and BOP stack profiles used for the drilling of the above mentioned well. 

G) Availability of rig to drill relief well, rig constraints and timing of rigs 

LLOG currently has one deepwater MODU under contract (Noble Amos Runner moored semi). In the event 

of a blowout scenario that does not involve loss or damage to the rig such as an inadvertent disconnect of 

the BOP’s, then the existing contracted rig may be available for drilling the relief well and vertical 

intervention work. If the blowout scenario involves damage to the rig or loss of the BOP’s and riser, a 

replacement rig or rigs will be required. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 10

 
With the current activity level in the GOM, 25 to 30 deepwater MODU’S are potentially available to support 

the relief well drilling operations. Rig share and resource sharing agreements are in place between 

members of the Helix Well Containment Group. The ability to negotiate and contract an appropriate rig or 

rigs to drill relief wells is highly probable in a short period of time. If the rig or rigs are operating, the time to 

properly secure the well and mobe the rig to the relief well site location is estimated to be about 14 to 21 

days. Dynamically positioned (DP) MODU’s would be the preferred option due to the logistical advantage 

versus a moored MODU which may add complications due to the mooring spread. 

VESSELS OF OPPORTUNITY

Based on the water depth restrictions for the proposed locations the following “Vessels of Opportunity” are 

presently available for utilization for intervention and containment and relief well operations. These may 

include service vessels and drilling rigs capable of working in the potential water depths and may include 

moored vessels and dynamically positioned vessels. The specific conditions of the intervention or relief well 

operations will dictate the “best fit” vessel to efficiently perform the desired results based on the blowout 

scenario. The list included below illustrates specific option that may vary according to the actual timing / 

availability at the time the vessels are needed. 

OPERATION SPECIFIC VESSEL OF OPPORTUNITY 

Intervention and Containment • Helix Q4000 (DP Semi) 

• Helix Producer 1 (DP FPU) 

Relief Well Drilling Rigs • Seadrill West Sirius (DP Semi) 

• Ensco 8502 (DP Semi) 

• Transocean Enterprise (DP Drillship) 

ROV / Multi-Purpose Service Vessels • Oceaneering (numerous DP ROV vessels) 

• HOS Achiever, Iron Horse 1 and 2 (DP MPSV) 

• Helix Pipe Lay Vessel (equipped w/ 6” PL – 75,000’) 

• Other ROV Vessels – (Chouest, HOS, Fugro, Subsea 7)

Shuttle Tanker / Barge Support • OSG Ship Management 

H) Measures taken to enhance ability to prevent blowout / reduce likelihood of blowout 

Pursuant to BOEM-2010-034 Final Interim Rules, measures to enhance the ability to prevent or reduce the 

likelihood of a blowout are largely based on proper planning and communication, identification of potential 

hazards, training and experience of personnel, use of good oil field practices and proper equipment that is 

properly maintained and inspected for executing drilling operations of the proposed well or wells to be 

drilled. 

When planning and designing the well, ample time is spent analyzing offset data, performing any needed 

earth modeling and identifying any potential drilling hazards or well specific conditions to safeguard the 

safety of the crews when well construction operations are underway. Once the design criteria and well 

design is established, the well design is modeled for the lifecycle of the wellbore to ensure potential failure 

modes are eliminated. Pursuant to BOEM-2010-0034 Interim Final Rules implemented additional 

considerations of a minimum of 2 independent barriers for both internal and external flow paths in addition to 

proper positive and negative testing of the barriers. 

The proper training of crew members and awareness to identify and handle well control event is the best 

way prevent a blowout incident. Contractor’s personnel and service personnel training requirements are 

verified per regulatory requirements per guidelines issued in BOEM-2010-034 Interim Final Rules. Drills are 

performed frequently to verify crew training and improve reaction times. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 11

 
Good communication between rig personnel, office support personnel is critical to the success of the 

operations. Pre-spud meetings are conducted with rig crews and service providers to discuss, inform and 

as needed improve operations and well plans for safety and efficiency considerations. Daily meetings are 

conducted to discuss planning and potential hazards to ensure state of preparedness and behavior is 

enforced to create an informed and safe culture for the operations. Any changes in the planning and initial 

wellbore design is incorporated and communicated in a Management of Change (MOC) process to ensure 

continuity for all personnel. 

Use of established good oil field practices that safeguard crews and equipment are integrated to incorporate 

LLOG’s, the contractor and service provider policies. 

Additional personnel and equipment will be used as needed to elevate awareness and provide real time 

monitoring of well conditions while drilling such as MWD/LWD/PWD tools used in the bottom hole 

assemblies. The tool configuration for each open hole section varies to optimize information gathered 

including the use of Formation-Pressure-While-Drilling (FPWD) tools to establish real time formation 

pressures and to be used to calibrates pore pressure models while drilling. Log information and pressure 

data is used by the drilling engineers, geologist and pore pressure engineers to maintain well control and 

reduced potential events such as well control events and loss circulation events. 

Mud loggers continuously monitor return drilling fluids, drill gas levels and cuttings as well as surface mud 

volumes and flow rates, rate of penetration and lithology/paleo to aid in understanding trends and geology 

being drilled. Remote monitoring of real time drilling parameters and evaluation of geologic markers and 

pore pressure indicators is used to identify potential well condition changes. 

Proper equipment maintenance and inspection program for same to before the equipment is required. 

Programmed equipment inspections and maintenance will be performed to ensure the equipment operability 

and condition. Operations will cease as needed in order to ensure equipment and well conditions are 

maintained and controlled for the safety of personnel, rig and subsurface equipment and the environment. 

I) Measures to conduct effective and early intervention in the event of a blowout 

In conjunction with the LLOG Exploration’s “Well Control Emergency Response Plan” and as required by 

NTL 2010-N06, the following is provided to demonstrate the potential time needed for performing secondary 

intervention and drilling of a relief well to handle potential worst case discharge for the proposed prospect. 

Specific plans are integrated into the Helix Well Containment Groups procures to be approved and 

submitted with the Application for Permit to Drill. Equipment availability, backup equipment and adaptability 

to the potential scenarios will need to be addressed based on the initial site assessment of the seafloor 

conditions for intervention operations. Relief well equipment such as backup wellhead equipment and 

tubulars will be available in LLOG’s inventory for immediate deployment as needed to address frilling the 

relief well(s). 

SITE SPECIFIC PROPOSED RELIEF WELL AND INTERVENTION PLANNING

No platform was considered for drilling relief wells for this location due to location, water depth and lack of 

appropriate platform within the area. For this reason a moored or DP MODU will be preferred / required. 

A relief well site has been initially identified to address blowout scenarios for the potential geologic targets 

for the proposed wells. One relief well surface locations is proposed for the proposed exploration plan well. 

Due to shipping fairway restrictions, the proposed relief well location(s) is dependent on governmental 

agency approvals. A 1000’ bathometry limit is planned to accommodate the use of DP MODUs which 

typically need 1000’ water depths to operate in a very tight watch circle. Based on actual seafloor state 

unforeseen at this time, the final location(s) may need to be revised. The location has been selected based 

on proximity to the targets sands and potential shallow hazards. 

 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 12

 
Proposed EP Well Proposed Relief Well X (NAD 27) Y (NAD 27) 

MC 301 OCS-G-24069 MC 301 RW1 1,269,442’ 10,419,549’ 

MC 301 RW2 1,274,238’ 10,417,443’ 

MC 301 RW3 1,270,863’ 10,414,416’ 

“*” indicates common relief well site to more than 1 exploration plan well 

RELIEF WELL RESPONSE TIME ESTIMATE

OPERATION TIME ESTIMATE 

 (DAYS)

IMMEDIATE RESPONSE 

• safeguard personnel, render first-aid 

• make initial notifications 

• implement short term intervention (if possible) 

• implement spill control 

• develop Initial Action Plan 

 

 1 

INTERIM REPSONSE 

• establish Onsite Command Center and Emergency Management Team 

• assess well control issues 

• mobilize people and equipment (Helix DW Containment System) 

• implement short term intervention and containment (if possible) 

• develop Intervention Plan 

• initiate relief well planning, negotiate, acquire rig(s) – 4 days

• continue spill control measures 

 

 4 

INTERVENTION AND CONTAIMENT OPERATIONS 

• mobilize equipment and initiate intervention and containment operations

• perform TA operations and mobilize relief wells rig(s) 

• secure rig operations (10 days), prep and mobe to location (4 days) 

• finalize relief well plans, mobilize spud equipment, receive approvals 

• continue spill control measures 

 14 

RELIEF WELL(S) OPERATIONS 

• continue intervention and containment measures

• continue spill control measures

• drill relief well(s), ranging operations to intersect wellbore

 65 

PERFORM HYDRAULIC KILL OPERATIONS / SECURE BLOWNOUT WELL 

• continue intervention and containment measures

• continue spill control measures

• perform hydraulic kill operations, monitor well, secure well

 

 20 

 ESTIMATED TOTAL DAYS OF UNCONTROLLED FLOW 104 

SECURE RELIELF WELL(S) / PERFORM P&A / TA OPERATIONS / DEMOBE 30 

TOTAL DAYS 129 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 13

 
Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 14

 
APPENDIX C 

GEOLOGICAL AND GEOPHYSICAL INFORMATION

(30 CFR Part 250.214 and 250.244) 

A. Geological Description

Included as Attachment E are the geological targets and a narrative of trapping features 

proposed in this Plan

B. Structure Contour Maps

Included as Attachment F are current structure maps (depth base and expressed in feet 

subsea) depicting the entire lease coverage area; drawn on top of the prospective 

hydrocarbon sands. The maps depict each proposed bottom hole location and 

applicable geological cross section. 

C. Interpreted Seismic Lines

Included as Attachment G is a copy of the migrated and annotated (shot points, time 

lines, well paths) deep seismic line within 500 feet of the surface location being 

proposed in this Plan. 

D. Geological Structure Cross-Sections

An interpreted geological cross section depicting the proposed well locations and depth 

of the proposed wells is included as Attachment H. Such cross section corresponds to 

each seismic line being submitted. 

E. Shallow Hazards Report

Berger Geosciences, LLC conducted a Shallow Hazards Assessment, Benthic 

Communities Evaluation, and Archaeological Resource Survey for Mississippi Canyon 

Block 301 on behalf of LLOG Exploration Offshore, Inc. The purpose of the survey 

was to evaluate geologic conditions and inspect for potential hazards or constraints to 

lease development. The report was submitted to Minerals Management Service 

(BOEMRE) under separate cover on September 22, 2011. 

F. Shallow Hazards Assessment

Utilizing the 3D deep seismic exploration data a shallow hazards analysis was prepared 

for the proposed surface locations, evaluating seafloor and subsurface geologic and 

manmade features and conditions, and is included as Attachment I. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 15

 
G. High Resolution Seismic Lines

LLOG provided exploration 3-D seismic data for the evaluation of the proposed surface 

disturbance operations. 

H. Stratigraphic Column

A generalized biostratigraphic/lithostratigraphic column from the seafloor to the total 

depth of the proposed wells is included as Attachment J. 

I. Time vs Depth Tables

LLOG has determined that there is existing sufficient well control data for the target 

areas proposed in this plan; therefore, tables providing seismic time versus depth for the 

proposed well locations are not required. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 16

 
Geological Description

Attachment E 

(Proprietary Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 17

 
Structure Maps

Attachment F 

(Proprietary Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 18

 
Deep Seismic Lines

Attachment G 

(Proprietary Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 19

 
Cross Section Maps

Attachment H 

(Proprietary Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 20

 
Shallow Hazards Assessment

Attachment I 

(Public Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 21

 
Project No. 11-03-01

Executive Summary

This report provides an assessment of the seafloor and subsurface conditions in Mississippi 

Canyon (MC) Block 301 (the study area) that can impact exploration activities. The 

assessment is based on interpretation of 3-D seismic data and information from the MC 255, 

256, and 300 Shallow Hazards Assessment (Berger, 2010), submitted to LLOG in 

December 2010. The limit of the investigation is constrained to the sediments between the 

seafloor and 1.2 seconds two-way travel time below the mudline (~3,590 ft).

The following points summarize the seafloor and shallow geologic conditions in the study 

area.

Section 1 – Shallow Hazards Assessment

 Water depths in the seafloor assessment area range from approximately 5,466 ft to 

6,496 ft.

 Pursuant to the public information in the Bureau of Ocean Energy Management, 

Regulation and Enforcement (BOEMRE) database, there is an existing well in the 

northwestern portion of MC 300. A 2” fiber optic cable owned by BP extends 

southwest to northeast across the center of the assessment area.

 Salt uplift within the seafloor assessment area has led to complex and irregular 

morphology but is limited to the eastern portion of the area represented by Mobile 

Dome. The only seafloor faulting within the assessment area is atop Mobile Dome. 

The dome is bounded by a steep escarpment and slump failures.

 The general dip of the seafloor is to the south. Slopes range from nearly flat to 60° 

along the margin of Mobile Dome. 

 Seafloor amplitude anomalies indicating areas of potential hydrocarbons at or near 

the seafloor are located above the salt in the southeastern portion of the seafloor 

assessment area. 

 Subsurface amplitude anomalies representing possible shallow gas are present in

stratigraphic sequences below Horizon 1. There is an overall negligible- to

moderate-potential for encountering shallow gas in the study area.

 Bottom-simulating reflectors, and other potential indicators of gas hydrates have not 

been identified in the subsurface study area. There is an overall negligible- to 

low-potential for encountering gas hydrates in the study area.

 Seven horizons and the top of salt were mapped within the study area. There are no 

significant sand units anticipated above Horizon 4 with one exception just above 

Horizon 4. The regional risk of shallow water flow (SWF) is low. The potential for 

SWF within the study area ranges from negligible (clay-dominated units) to 

moderate (sand-bearing units). This range is based on offset well reports in the area 

and stratigraphic conditions.

 A detailed hazards assessment and a tophole prognosis for the proposed well in the 

study area are included in the Wellsite Discussion of this report.
Project No. 11-03-01

 Any additional proposed wells within the study area should also have detailed 

hazards assessments and tophole prognosis figures prepared.

Section 2 – Benthic Communities Evaluation

 Although we do not know the exact anchor pattern to be used, the maximum area of 

proposed disturbances to the seafloor is 15,500 ft from the proposed well as per 

LLOG’s request.

 Seafloor amplitude anomalies indicating areas of potential hydrocarbons at or near 

the seafloor are located above the salt in the southeastern part of the seafloor 

assessment area. The presence of seafloor anomalies may represent areas of 

hardgrounds that may support high-density chemosynthetic or other benthic 

communities.

 An expulsion feature is located in the central portion of MC 301 that may support 

chemosynthetic or other benthic communities. Further analysis indicated that there 

are no signs of potential hardgrounds that may support high-density chemosynthetic 

or other benthic communities. 

 There are no apparent features or areas that could support high-density benthic

communities identified within 2,000 ft of the proposed muds and cuttings discharge 

location for the proposed well in the study area.

 We recommend that any seafloor disturbances be located at least 250 ft from any 

features that could support high-density benthic communities. We recommend using 

a state-of-the art positioning system to ensure any seafloor disturbances do not occur 

within 250 ft of such areas.

 Any additional proposed wells within the anchor assessment area should also have a 

detailed benthic communities evaluation prepared.

Section 3 – Archaeological Resource Survey

 Information from an archaeological resource survey and report entitled, 

“Archaeological Deep Tow Survey, Blocks 255, 256, 300, 301, 344, 388 Mississippi 

Canyon Area, OCS-G 24064, OCS-G 22865, OCS-G 22868, OCS-G 24069, OCS-G 

24074, OCS-G 27272” completed by Tesla Offshore, LLC is included in Section 3 

of this report. The complete archaeological report is to be submitted under separate 

cover.

 Eleven sonar contacts were identified within the seismic data coverage area. Four

sonar contacts are located within the maximum anchor radius of the proposed well.

A 100 ft avoidance radius was recommended by Tesla for three of the sonar 

contacts. A 500 ft avoidance radius was recommended by Tesla for one sonar 

contact located in the northeastern portion of MC 257.

 For further description of individual sonar contacts, refer to the Tesla archaeological 

report (Tesla, 2010).
Stratigraphic Column

Attachment J 

(Proprietary Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 22

 
APPENDIX D 

HYDROGEN SULFIDE (H2S) INFORMATION

(30 CFR Part 250.215 and 250.245) 

A. Concentration

LLOG does not anticipate encountering H2S while conducting the proposed exploratory 

operations provided for under this plan. 

B. Classification

In accordance with 30 CFR 250.490(c) and NTL 2007-G11, LLOG requests that the 

proposed location be classified H2S unknown. 

Further investigation is ongoing as offset well information becomes available. A final 

determination will be made prior to submission of the Application for Permit to Drill as 

to whether the presence of H2S is still classified as unknown. 

C. H2S Contingency Plan

Contingent upon the outcome of B above, LLOG will submit to the appropriate 

BOEMRE GOMR District Office an H2S Contingency Plan prepared according to 30 

CFR 250.417(f) before conducting the proposed exploration activities. 

D. Modeling Report

Not applicable to the proposed operations. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 23

 
APPENDIX E 

BIOLOGICAL, PHYSICAL AND SOCIOECONOMIC INFORMATION

(30 CFR Part 250.216 and 250.247) 

A. High-Density Deepwater Benthic Communities Information

The maximum area of proposed disturbances to the seafloor is 15,500’ from the 

proposed well. Seafloor amplitude anomalies indicating areas of potential 

hydrocarbons at or near the seafloor are located above the salt in the southeastern part 

of the seafloor assessment area. The presence of seafloor anomalies may represent 

areas of hardgrounds that may support high-density chemosynthetic or other benthic 

communities. 

An expulsion feature is located in the central portion of MC 301 that may support 

chemosynthetic or other benthic communities. Further analysis indicated that there are 

no signs of potential hardgrounds that may support high-density chemosynthetic or 

other benthic communities. 

There are no apparent features or areas that could support high-density benthic 

communities identified within 2,000’ of the proposed muds and cuttings discharge 

location for the proposed well in the study area. 

B. Topographic Features Map

The activities proposed in this Plan are not affected by a topographic feature. 

C. Topographic Features Statement (Shunting)

The activities proposed in this Plan are not affected by a topographic feature; therefore, 

LLOG is not required to shunt drill cuttings and drill fluids. 

D. Live Bottoms (Pinnacle Trend) Map

Mississippi Canyon Block 301 is not located within the vicinity of a proposed live 

bottom (Pinnacle trend) area. 

E. Live Bottoms (Low Relief) Map

Mississippi Canyon Block 301 is not located within the vicinity of a proposed live 

bottom (Low Relief) area. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 24

 
F. Potentially Sensitive Biological Features Map

Mississippi Canyon Block 301 is not located within the vicinity of a proposed sensitive 

biological feature area. 

G. Remotely Operated Vehicle (ROV) Monitoring Survey Plan

 

Mississippi Canyon Block 301 is located in Grid 16 which does not require a ROV 

survey. 

H. Threatened or Endangered Species, Critical Habitat, and Marine 

Mammal Information. 

Proposed activities in Mississippi Canyon Block 301 is not located in the presence of 

federally listed threatened or endangered species and critical habitat designated under 

the ESA and marine mammal protected under the MMPA. 

I. Archaeological Report

Berger Geosciences, LLC conducted a Shallow Hazards Assessment, Benthic 

Communities Evaluation, and Archaeological Resource Survey for Mississippi Canyon 

Block 301 on behalf of LLOG Exploration Offshore, Inc. The purpose of the survey 

was to evaluate geologic conditions and inspect for potential hazards or constraints to 

lease development. The report was submitted to Minerals Management Service 

(BOEMRE) under separate cover on September 22, 2011. 

J. Air and Water Quality Information

 Not applicable to proposed operations. 

K. Socioeconomic Information

 Not applicable to proposed operations. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 25

 
NOAA Species Known in GOM

Attachment K 

(Public Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 26

 


APPENDIX F 

WASTE AND DISCHARGE INFORMATION

(30 CFR PART 250.217 AND 250.248) 

A. Projected Generated Wastes

See the following tables:

TABLE 1. Wastes you will generate, treat and downhole dispose or 

discharge to the GOM 

 TABLE 2. Wastes you will transport and /or dispose of onshore 

B. Modeling

Not applicable. Proposed activities will be covered by U.S. EPA NPDES General 

Permit. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 27

 
please specify if the amount reported is a total or per well amount

MC Block 301

Projected Generated Waste Projected Ocean Discharges 

Type of Waste Composition Projected Amount Discharge rate Discharge Method Answer yes or no

Will drilling occur ? If yes, fill in the muds and cuttings.

EXAMPLE: Cuttings wetted with synthetic 

based fluid 

using synthetic based 

drilling fluid. X bbl/well X bbl/day/well discharge overboard No

Water-based drilling fluid

Water based mud 

additives, barite and gel 

used for WBM 80,822 bbls/well 8,572 bbls/day/well Discharge overboard No

Cuttings wetted with water-based fluid

Cuttings generated while 

using water based drilling 

fluid. 4,156 bbls/well 441 bbls/day/well Discharge overboard No

Cuttings wetted with synthetic-based fluid 

Cuttings generated while 

using synthetic based 

drilling fluid. 2,888 bbls/well 116 bbls/day/well Discharge overboard No

Will humans be there? If yes, expect conventional waste

EXAMPLE: Sanitary waste water

Sanitary waste from living 

quarters X bbl/well X bbl/hr/well

chlorinate and 

discharge overboard No

Domestic waste

Misc waste for living 

quarters 12,146 bbls/well 2.7 bbls/hr/well

Discharge overboard 

(no free oil) No

Sanitary waste

Processed sanitary waste 

from living quarters 8,098 bbls/well 1.8 bbls/hr/well

Chlorinate and 

discharge overboard No

Is there a deck? If yes, there will be Deck Drainage

Deck Drainage

Accumulated drainage due 

to rainfall 0 to 47,261 bbls/well 0 to 167 bbls/hr/well

Test for oil and grease 

and discharge 

overboard No

Will you conduct well treatment, completion, or workover? 

Well treatment fluids

NPDES approved 

treatment fluid used for 

well operations 100 bbls/well 0 to 20 bbls/hr/well

Test for oil and grease 

and discharge 

overboard. No

Well completion fluids

Clear brines used for 

completion operations 500 bbls/well 0 to 100 bbls/hr/well

Test for oil and grease 

and discharge 

overboard. This 

excludes clear brines 

containing Zinc No 

Workover fluids N/A N/A NA NA No

Miscellaneous discharges. If yes, only fill in those associated with your activity. 

Desalinization unit discharge

Uncontaminated spent 

seawater used for potable 

water generation unit 0 to 5,000 bbls/well 0 to 700 bbls/hr/well Discharge overboard No 

Blowout prevent fluid

Treated freshwater used 

control of subsea blowout 

preventers 0 to 100 bbls/well 0 t0 20 bbls/hr/well

Discharge at seafloor 

when BOP's installed No

Ballast water

Uncontaminated seawater 

used for ballast control

0 to 100,000 

bbls/well 16,350 bbls/hr/well Discharge overboard No

Bilge water

Uncontaminated 

freshwater and seawater 

overflow / leakage 

accumuated from 

machinery operations 0 to 5000 bbls/well

0 to 1635 

bbls/hr/well Discharge overboard No

Excess cement at seafloor

Excess cement slurry and 

mixwater used for 

cementing operation - 

NPDES allowed 300 bbls/well 0 to 360 bbls/hr/well Discharge at mudline No

Fire water

Uncontaminated seawater 

used for fire control 

system 0 to 10,000 bbls/well

0 to 16,350 

bbls/hr/well Discharge overboard No

Cooling water

Uncontaminated seawater 

used for heat exchanger 

operations used to cool 

machinery 3,367,000 bbls/well 1542 bbls/hr/well Discharge overboard No

Will you produce hydrocarbons? If yes fill in for produced water.

Produced water NA NA NA NA No

Will you be covered by an individual or general NPDES permit ? NPDES Permit# GMG290000

NOTE: If you will not have a type of waste, enter NA in the row. 

j

Downhole 

Disposal

TABLE 1. WASTES YOU WILL GENERATE, TREAT AND DOWNHOLE DISPOSE OR 

DISCHARGE TO THE GOM
Please specify whatever the amount reported is a total or per well

MC Block 301

Projected 

generated waste

Solid and Liquid

Wastses 

Transportation

Type of Waste Composition Transport Method Name/Location of Facility Amount 

Newport Environmental Services Inc., Ingleside, TX X bbl/well 

Oil-based drilling fluid or mud N/A NA N/A NA Synthetic-based drilling fluid or mud 

Internal olifin, ester nbased mud

Barged in 25 bbls cutting boxes and / or liquid mud tanks for supply vessels

Newpark Transfer Station, Fourchon, LA 6750 bbls / w

Cuttings wetted with Water-based fluid N/A NA N/A NA Cuttings wetted with Synthetic-based fluid N/A NA N/A NA Cuttings wetted with oil-based fluids N/A NA N/A NA 

Will you produce hydrocarbons? If yes fill in for produced sand.

Produced sand N/A N/A N/A N/A EXAMPLE: trash and debris (recylables) Plastic, paper, aluminum barged in a storage bin ARC, New Iberia, LA X lb/well 

Trash and debris Plastic, paper, aluminum Barged in a storage bin

Blanchard Landfill, Golden Meadows, LA 4000 lbs / we

Used oil Spent oil from machinery

Barged in USCG approved transfer tote tanks. L&L Services, Fourchon, LA 200 bbls / we

Wash water

Wash water w/ SBM residue and surfactants

Barged in 25 bbls cutting boxes and / or liquid mud tanks for supply vessels

Newpark Transfer Station, Fourchon, LA 2000 bbls / w

Chemical product wastes

Spent treatment and / or damaged chemicals used in operations

Barged in 25 bbls cutting boxes and / or cutting boxes L&L Services, Fourchon, LA 10 bbls / well 

NOTE: If you will not have a type of waste, enter NA in the row. 

TABLE 2. WASTES YOU WILL TRANSPORT AND /OR DISPOSE OF ONSHORE 

Will you have additional wastes that are not permitted for discharge? If 

Waste Dispo
APPENDIX G 

AIR EMISSIONS INFORMATION

(30 CFR PART 250.218AND 250.249) 

A. Emissions Worksheets and Screening Questions

The Projected Quality Emissions Report (Form MMS-138) addresses the proposed 

drilling, completion and potential testing operations utilizing a typical semisubmersible drilling unit, with related support vessels and construction barge 

information. 

As evidenced by the Screening Questions below, the proposed operations screened 

out based on “no” answer to all the screening questions. 

Screening Questions for EP’s Yes No 

Is any calculated Complete Total (CT) Emission amount (in tons associated with your 

proposed exploration activities more than 90% of the amounts calculated using the 

following formulas: CT = 3400D(2/3) for CO, and CT = 33.3D for the other air 

pollutants (where D = distance to shore in miles)? 

X 

Does your emission calculations include any emission reduction measures or modified 

emission factors? 

X 

Are your proposed exploration activities located east of 87.5 degrees W longitude? X 

Do you expect to encounter H2S at concentrations greater than 20 parts per million 

(ppm)? 

X 

Do you propose to flare or vent natural gas for more than 48 continuous hours from any 

proposed well? 

X 

Do you propose to burn produced hydrocarbon liquids? X 

B. Emissions Reduction Measures

The projected air emissions are within the exemption level; therefore, no emission 

reduction measures are being proposed. 

C. Verification of Nondefault Emissions Factors

LLOG has elected to use the default emission factors as provided in Attachment L. 

D. Non-Exempt Activities

 

The proposed activities are within the exemption amount as provided in Attachment L.

E. Modeling Report 

This section of the Plan is not applicable to the proposed operations.

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 28

 
Air Quality Emissions Report

Attachment L 

(Public Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 29

 
COMPANY LLOG Exploration Offshore, L.L.C. 

AREA Mississippi Canyon 

BLOCK 301 

LEASE OCS-G-24069 

PLATFORM 

WELL A 

 

COMPANY 

CONTACT Kathy Gowland 

TELEPHONE NO. 985-801-4300 

REMARKS Drill and complete one well 

Air Pollutant Plan Emission 

Amounts* 

(tons) 

Calculated 

Exemption 

Amounts** 

(tons) 

Calculated 

Complex Total 

Emission 

Amounts*** 

(tons) 

Carbon monoxide (CO) 169.12 53831.85 N/A 

Particulate matter (PM) 22.55 2097.90 N/A 

Sulphur dioxide (SOx) 103.44 2097.90 N/A 

Nitrogen oxides (NOx) 775.11 2097.90 N/A 

Volatile organic compounds (VOC) 23.25 2097.90 N/A 

 *For activities proposed in your EP, list the projected emissions calculated from the worksheet. 

 **List the exemption amounts in your proposed activities calculated using the formulas in 30 CFR 250.303(d). 

***List the complex total emissions associated with your porposed activities calculated from the worksheets. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 30

 
APPENDIX H 

OIL SPILL INFORMATION

(30 CFR PART 250.219 AND 250.250)

A. Oil Spill Response Planning

All the proposed activities in this Plan will be covered by the Oil Spill Response Plan 

(OSRP) filed by LLOG (MMS Operator No. 02058) in accordance with 30 CFR 254 

and approved on June 3, 2009, modified October 5, 2010, November 10, 2010, January 

13, 2011, March 15, 2011 and modification received June 8, 2011. Certification letter 

accepted July 11, 2011. 

The WCD proposed in this Plan does not exceed the WCD outlined in our OSRP. 

B. Spill Response Sites

The following locations will be used in the event an oil spill occurs as a result of the 

proposed activities. 

Primary Response Equipment 

Location 

Pre-Planned Staging Location(s) 

Houma, LA Fort Jackson, LA 

C. OSRO Information

The O’Brien Group (TOG) will provide trained personnel capable of providing 

supervisory management of the oil spill response in addition to contacting and 

deploying cleanup personnel and equipment 

LLOG utilizes Clean Gulf Associates (CGA) as it’s primary provider for equipment, 

which is an industry cooperative owning an inventory of oil spill clean-up equipment. 

CGA is supported by the Marine Spill Response Corporation’s (MSRC), which is 

responsible for storing, inspecting, maintaining and dispatching CGA’s equipment. The 

MSRC STARS network provides for the closest available personnel, as well as an 

MSRC supervisor to operate the equipment. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 31

 
D. Worst-Case Scenario Information

Category Regional OSRP Revised EP 

Type of Activity Exploratory MODU Exploratory MODU 

Facility Surface Location Mississippi Canyon Block 547 Mississippi Canyon Block 301 

Facility Description Well Location Well No. SS002 

(Location B) 

Location A 

Distance to Nearest Shoreline 

(Miles) 38.4 miles 53 miles 

Volume: 

 Storage Tanks (total) 

 Facility Piping (total) 

 Lease Term Pipeline 

 Uncontrolled Blowout (day) 

 Barging 

Potential 24 Hour Volume 

(bbls) 225,144 bbls 

 

 

110,674bbls 

 

Type of Liquid Hydrocarbon Crude Oil Crude Oil 

API Gravity 28o 36o 

Since LLOG Exploration Offshore, L.L.C. (LLOG) has the capability to respond to the 

appropriate worst-case spill scenario included in its regional OSRP approved on June 3, 

2009, modified October 5, 2010, November 10, 2010, January 13, 2011, March 15, 

2011, and modification received June 8, 2011, and certification letter accepted July 11, 

2011, I hereby certify that LLOG has the capability to respond, to the maximum extent 

practicable, to a worst-case discharge, or a substantial threat of such a discharge, 

resulting from the activities proposed in this EP. The WCD for the subject plan does 

not exceed the worst case discharge previously submitted for MC 547. 

LLOG Exploration Offshore, L.L.C., Company No. 02058, previously submitted the 

Regional OSRP Exploration WCD volume to be reviewed in Plan R-5139, Revised 

Exploration Plan submitted on March 2, 2011. 

 

The required proprietary data outlined in NTL 2010-N06 is being submitted to 

BOEMRE with the Confidential Copy of this Supplemental Exploration Plan. 

E. Oil Spill Response Discussion

See the following Oil Spill Response Discussion. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 32

 
SPILL RESPONSE DISCUSSION 

For the purpose of NEPA and Coastal Zone Management Act analysis, the largest spill volume 

originating from the proposed activity would be a well blowout during drilling operations, 

estimated to be 110,674 barrels of crude oil with an API gravity of 36°. 

Land Segment and Resource Identification

Trajectories of a spill and the probability of it impacting a land segment have been projected 

utilizing information in the BSEE Oil Spill Risk Analysis Model (OSRAM) for the Central and 

Western Gulf of Mexico available on the BSEE website. The results are shown in Figure 1. The 

BSEE OSRAM identifies a 21% probability of impact to the shorelines of Plaquemines Parish, 

LA within 30 days. Plaquemines Parish includes Barataria Bay, the Mississippi River Delta, 

Breton Sound and the affiliated islands and bays. This region is an extremely sensitive habitat, 

and serves as a migratory, breeding, feeding and nursery habitat for numerous species of 

wildlife. Beaches in this area vary in grain particle size, and can be classified as fine sand, shell 

or perched shell beaches. Sandy and muddy tidal flats are also abundant. 

Response

LLOG Exploration Offshore, L.L.C. will make every effort to respond to the Worst Case 

Discharge as effectively as practicable. A description of the response equipment under contract 

to contain and recover the Worst Case Discharge is shown in Figure 2.

Using the estimated chemical and physical characteristics of crude oil, an ADIOS weathering 

model was run on a similar product from the ADIOS oil database. The results indicate 20% or 

approximately 22,134 barrels of crude oil would be evaporated/dispersed within 24 hours, with 

approximately 88,540 barrels remaining. 

Spill Response MC 301, Well Location A Barrels of Oil 

WCD Volume 110,674 

Less 20% natural evaporation/dispersion 22,134 

Remaining volume 88,540 

Daily dispersant capability 7,540 

Oil addressed by in-situ burning 4,427 

Figure 2 outlines equipment, personnel, materials and support vessels as well as temporary 

storage equipment available to respond to a spill of approximately 88,540 barrels. The volume 

accounts for the amount remaining after evaporation/dispersion at 24 hours. The list estimates 

individual times needed for procurement, load out, travel time to the site and deployment. Figure 

2 also indicates how operations will be supported. 
LLOG Exploration Offshore, L.L.C.’s Oil Spill Response Plan includes alternative response 

technologies such as dispersants and in-situ burn. Strategies will be decided by Unified 

Command based on size of the spill, weather and potential impacts. If aerial dispersants are 

utilized, 8 sorties (9,600 gallons) from two of the DC-3 aircrafts and 4 sorties (8,000 gallons) 

from the Basler aircraft would provide a daily dispersant capability of 7,540 barrels. If the 

conditions are favorable for in-situ burning, the proper approvals have been obtained and the 

proper planning is in place, in-situ burning of oil may be attempted. Using estimates based on the 

Deepwater Horizon spill of 2010, up to 5% or approximately 4,427 barrels of the total daily 

Worst Case Discharge volume could be burned. Slick containment boom would be immediately 

called out and on-scene as soon as possible. Offshore response strategies may include attempting 

to skim utilizing the HOSS Barge, nine Fast Response Units, two Aqua Guard Triton RBS 

skimmers, and five sets of Koseq skimming arms, with a total derated skimming capacity of 

211,635 barrels. Temporary storage associated with skimming equipment equals 19,700 barrels. 

If additional storage is needed, an 80,000 barrel storage barge, an 83,937 barrel storage barge, 

and an 86,948 barrel storage barge may be mobilized and centrally located to provide temporary 

storage allowing the skimmers to stay in the area of operations as much as possible. Safety is 

first priority. Air monitoring will be accomplished and operations deemed safe prior to 

any containment/skimming attempts. 

If the spill went unabated, shoreline impact in Plaquemines Parish, Louisiana would depend 

upon existing environmental conditions. Shoreline protection would include the use of CGA’s 

near shore and shallow water skimmers with a totaled derated skimming capacity of 54,753 

barrels. Temporary storage associated with skimming equipment equals 1,861 barrels. If 

additional storage is needed, an 86,948 barrel storage barge may be mobilized and centrally 

located to provide temporary storage allowing the skimmers to stay in the area of operations as 

much as possible. Onshore response may include the deployment of shoreline boom on beach 

areas, or protection and sorbent boom on vegetated areas. MSAs with AMPOL and Oil Mop will 

ensure the availability of 147,000 feet of 18” shoreline boom. Figure 2 outlines individual times 

needed for procurement, load out, travel time to the site and deployment. Strategies would be 

based upon surveillance and real time trajectories that depict areas of potential impact given 

actual sea and weather conditions. The State of Louisiana Initial Oil Spill Response Plan for 

Plaquemines Parish and Unified Command would be consulted to ensure that environmental and 

special economic resources would be correctly identified and prioritized to ensure optimal 

protection. Shoreline protection strategies depict the protection response modes applicable for oil 

spill clean-up operations. The State of Louisiana Initial Oil Spill Response Plan provides detailed 

shoreline protection strategies for this area, and it describes necessary action to keep the oil spill 

from entering Louisiana’s coastal wetlands, based on the assumption that removal of the released 

oil will be much easier and less damaging to fragile coastal ecosystems if done in the open 

waters of the Gulf of Mexico. Supervisory personnel have the option to modify the deployment 

and operation of equipment allowing a more effective response to site-specific circumstances. 

LLOG Exploration Offshore, L.L.C.’s contract Spill Management Team holds a copy of the 

State of Louisiana Initial Oil Spill Response Plan. 
Based on the anticipated worst case discharge scenario, LLOG Exploration Offshore, L.L.C. can 

be onsite with contracted oil spill recovery equipment with adequate response capacity to contain 

and recover surface hydrocarbons, and prevent land impact, to the maximum extent practicable, 

within an estimated 36 hours (based on the equipment’s Effective Daily Recovery Capacity 

(EDRC)). LLOG Exploration Offshore, L.L.C. will continue to commit additional on-water 

mechanical recovery resources as well as apply dispersants and in-situ burning needed and as 

approved, under the supervision of the USCG Captain of the Port (COTP) and the Regional 

Response Team (RRT). 
Initial Response Considerations 

Actual actions taken during an oil spill response will be based on many factors to include but not 

be limited to: 

• Weather 

• Equipment and materials availability 

• Ocean currents and tides 

• Location of the spill 

• Product spilled 

• Amount spilled 

• Environmental risk assessments 

• Trajectory and product analysis 

• Well status, i.e., shut in or continual release 

LLOG Exploration Offshore, L.L.C. will take action to provide a safe, aggressive response to 

contain and recover as much of the spilled oil as quickly as it is safe to do so. In an effort to 

protect the environment, response actions will be designed to provide an “in-depth” protection 

strategy meant to recover as much oil as possible as far from environmentally sensitive areas as 

possible. Safety will take precedence over all other considerations during these operations. 

Upon notification of a spill, the following actions will be taken: 

• Information will be confirmed 

• An assessment will be made and initial objectives set 

• OSROs and appropriate agencies will be notified 

• ICS 201, Initial Report Form completed 

• Initial Safety plan will be written and published 

• Unified Command will be established 

o Overall safety plan developed to reflect the operational situation and coordinated 

objectives 

o Areas of responsibility established for Source Control and each surface operational 

site 

o On-site command and control established 

Offshore Response Actions 

Equipment Deployment

Surveillance 

• Surveillance Aircraft: within two hours of QI notification, or at first light

• Provide trained observer to provide on site status reports 

• Provide command and control platform at the site if needed 

• Continual surveillance of oil movement by remote sensing systems, aerial photography 

and visual confirmation 

• Continual monitoring of vessel assets using vessel monitoring systems 
Dispersant application assets 

• Put ASI on standby 

• With the FOSC, conduct analysis to determine appropriateness of dispersant application 

• Gain FOSC approval for use of dispersants on the surface 

• Deploy aircraft in accordance with a plan developed for the actual situation 

• Coordinate movement of dispersants, aircraft, and support equipment and personnel 

• Confirm dispersant availability for current and long range operations 

• Start ordering dispersant stocks required for expected operations 

Containment boom 

• Call out early and expedite deployment to be on scene ASAP 

• Ensure boom handling and mooring equipment is deployed with boom 

• Provide continuing reports to vessels to expedite their arrival at sites that will provide for 

their most effective containment 

• Use Vessels of Opportunity (VOO) to deploy and maintain boom 

Dedicated off-shore skimming systems 

General 

• Deployed to the highest concentration of oil 

• Assets deployed at safe distance from aerial dispersant and in-situ burn operations 

CGA HOSS Barge 

• Use in areas with heaviest oil concentrations 

• Consider for use in areas of known debris (seaweed, and other floating materials) 

CGA FRUs 

• To the area of the thickest oil 

• Use as far off-shore as allowed 

T&T Koseq Skimming Systems 

• To the area of the thickest oil 

• Use as far off-shore as allowed 

• VOOs with a minimum of 2,000 bbls storage capacity 

Storage Vessels 

• Establish availability of CGA contracted assets 

• Early call out (to allow for tug boat acquisition and deployment speeds) 

• Phase mobilization to allow storage vessels to arrive at the same time as skimming 

systems 

• Position as closely as possible to skimming assets to minimize offloading time 
Vessels of Opportunity (VOO) 

• Use LLOG Exploration Offshore, L.L.C.’s contracted resources as applicable 

• Industry vessels are usually best for deployment of Vessel of Opportunity Skimming 

Systems (VOSS) 

• Acquire additional resources as needed 

• Consider use of local assets, i.e. fishing and pleasure craft 

• Expect mission specific and safety training to be required 

• Plan with the US Coast Guard for vessel inspections 

In-situ Burn assets 

• Determine appropriateness of in-situ burn operation in coordination with the FOSC and 

affected SOSC 

• Determine availability of fire boom and selected ignition systems 

• Start ordering fire boom stocks required for expected operations 

• Contact boom manufacturer to provide training if required 

• Determine assets to perform on water operation 

• Build operations into safety plan 

• Conduct operations in accordance with an approved plan 
Near Shore Response Actions 

Timing 

• Put near shore assets on standby and deployment in accordance with planning based on 

the actual situation, actual trajectories and oil budgets 

• VOO identification and training in advance of spill nearing shoreline if possible 

• Outfitting of VOOs for specific missions 

• Deployment of assets based on actual movement of oil 

Considerations 

• Water depth, vessel draft 

• Shoreline gradient 

• State of the oil 

• Use of VOOs 

• Distance of surf zone from shoreline 

Equipment Deployment 

Surveillance 

• Provide trained observer to direct skimming operations 

• Continual surveillance of oil movement by remote sensing systems, aerial photography 

and visual confirmation 

• Continual monitoring of vessel assets 

Dispersant Use 

• Generally will not be approved within 3 miles of shore or with less than 10 meters of 

water depth 

• Approval would be at Regional Response Team level (Region 6) 

Vessel Deployment 

Dedicated Near Shore skimming systems 

• FRVs 

• Egmopol and Marco SWS 

• Operate with aerial spotter directing systems to observed oil slicks 

VOO 

• Use LLOG Exploration Offshore, L.L.C.’s contracted resources as applicable 

• Industry vessels are usually best for deployment of Vessel of Opportunity Skimming 

Systems (VOSS) 

• Acquire additional resources as needed 

• Consider use of local assets, i.e. fishing and pleasure craft 

• Expect mission specific and safety training to be required 

• Plan with the US Coast Guard for vessel inspections 

• Operate with aerial spotter directing systems to oil patches 
Shoreline Protection Operations 

Response Planning Considerations 

• Environmental risk assessments (ERA) to determine priorities for area protection 

• Time to acquire personnel and equipment and their availability 

• Previous contingency planning contained in the appropriate Area Contingency Plan, and 

currently for Louisiana, The State of Louisiana Initial Oil Spill Response Plan, Deep 

Water Horizon, dated 2 May 2010 (La. OSRP) 

Actions 

Placement of boom 

• Position boom in accordance with the ERA based on the actual situation or the 

appropriate ACP 

• Assess timing of booming operations to ensure it is where it needs to be at time of 

impact. Consider: 

o Trajectories 

o Weather forecast 

o Oil Impact forecast 

o Verified spill movement 

o Boom, manpower and vessel (shallow draft) availability 

o Near shore boom and support material, (stakes, anchors, line) 

Beach Preparation 

Considerations and Actions 

• Use of a 10 mile go/no go line to determine timing of beach cleaning 

• Shoreline Cleanup and Assessment Team Reports and recommendations 

• Determination of Archeological sites and gaining authority to enter 

• Monitoring of tide tables and weather to determine extent of high tides 

• Pre cleaning of beaches by moving waste above high time lines to minimize waste 

• Staging of equipment and housing of response personnel as close to the job site as 

possible to maximize on-site work time 

• Boom tending, repair, replacement and security (use of local assets may be advantageous) 

• Constant awareness of weather and oil movement for resource redeployment as necessary 

• In-situ burn may be considered when marshes have been impacted 

• Passive clean up of marshes should considered and appropriate stocks of sorbent boom 

and/or sweep obtained 

• Earthen berms and shoreline protection boom may be considered to protect sensitive 

inland areas 
Decanting Strategy 

Recovered oil and water mixtures will typically separate into distinct phases when left in a 

quiescent state. When separation occurs, the relatively clean water phase can be siphoned or 

decanted back to the recovery point with minimal, if any, impact. Decanting therefore increases 

the effective on-site oil storage capacity and equipment operating time. FOSC/SOSC approval 

will be requested prior to decanting operations. This practice is routinely used for oil spill 

recovery. 

CGA Equipment Limitations 

The capability for any spill response equipment, whether a dedicated or portable system, to 

operate in differing weather conditions will be directly in relation to the capabilities of the vessel 

the system in placed on. Most importantly, however, the decision to operate will be based on the 

judgment of the Unified Command and/or the Captain of the vessel, who will ultimately have the 

final say in terminating operations. Skimming equipment listed below may have operational 

limits which exceed those safety thresholds. As was seen in the Deepwater Horizon (DWH) oil 

spill response, vessel skimming operations ceased when seas reached 5-6 feet and vessels were 

often recalled to port when those conditions were exceeded. Systems below are some of the 

most up-to-date systems available and were employed during the DWH spill. 

Boom 3 foot seas, 20 knot winds 

Dispersants Winds more than 25 knots 

Visibility less than 3 nautical miles 

Ceiling less than 1,000 feet. 

FRU 8 foot seas 

HOSS Barge/OSRB 8 foot seas 

Koseq Arms 8 foot seas 

OSRV 4 foot seas 
Environmental Conditions in the GOM

Louisiana is situated between the easterly and westerly wind belts, and therefore, experiences 

westerly winds during the winter and easterly winds in the summer. Average wind speed is 

generally 14-15 mph along the coast. Wave heights average 4 and 5 feet. However, during 

hurricane season, Louisiana has recorded wave heights ranging from 40 to 50 feet high and 

winds reaching speeds of 100 mph. Because much of southern Louisiana lies below sea level, 

flooding is prominent. 

Surface water temperature ranges between 70 and 80 ̊F during the summer months. During the 

winter, the average temperature will range from 50 and 60 ̊F. 

The Atlantic and Gulf of Mexico hurricane season is officially from 1 June to 30 November. 

97% of all tropical activity occurs within this window. The Atlantic basin shows a very peaked 

season from August through October, with 78% of the tropical storm days, 87% of the minor 

(Saffir-Simpson Scale categories 1 and 2) hurricane days, and 96% of the major (Saffir-Simpson 

categories 3, 4 and 5) hurricane days occurring then. Maximum activity is in early to mid 

September. Once in a few years there may be a hurricane occurring "out of season" - primarily in 

May or December. Globally, September is the most active month and May is the least active 

month. 
FIGURE 1 

TRAJECTORY BY LAND SEGMENT 

Trajectory of a spill and the probability of it impacting a land segment have been 

projected utilizing LLOG Exploration Offshore, L.L.C.’s WCD and information in the 

BSEE Oil Spill Risk Analysis Model (OSRAM) for the Central and Western Gulf of 

Mexico available on the BSEE website using 30 day impact. The results are tabulated 

below. 

Area/Block OCS-G Launch 

Area Land Segment and/or Resource 

Conditional 

Probability (%) 

within 30 days 

Exploratory Drilling 

MC 301, 

Well Location A 

53 nautical miles from 

shore 

G24069 C57 Cameron Parish, LA 

Vermilion Parish, LA 

Terrebonne Parish, LA 

Lafourche Parish, LA 

Plaquemines Parish, LA 

St. Bernard Parish, LA 

Hancock & Harrison County, MS 

Jackson County, MS 

Mobile County, AL 

Baldwin County, AL 

Escambia County, FL 

Okaloosa County, FL 

Walton County, FL 

Bay County, FL 

1 

1 

2 

2 

21 

3 

1 

1 

1 

1 

1 

1 

1 

1 
WCD Scenario– BASED ON WELL BLOWOUT DURING DRILLING OPERATIONS (53 nautical miles 

88,540 bbls of crude oil (Volume considering natural weathering) API Gravity 36° 

FIGURE 2 – Equipment Response Time to MC 301, Well Location A 

Dispersant/Surveillance Dispersant Capacity (gal) Storage Capacity Persons Req. From Hrs to Procure Hrs to Loadout Travel to site 

CGA 

Basler 67T 2000 NA 2 Houma 1 1 0.9 

ASI 

DC 3 1200 NA 2 Houma 1 1 1.1 DC 3 1200 NA 2 Houma 1 1 1.1 Aero Commander NA NA 2 Houma 1 1 0.9 

Offshore Response 

Offshore Equipment No 

Staging EDRC Storage Capacity VOO Persons Required From Hrs to Procure Hrs to Loadout Hrs to GOM 

CGA 

HOSS Barge 43000 4000 3 Tugs 8 Harvey 7 0 5 

T&T Marine (available through contract with CGA) 

Koseq Skimming Arms (3) 53487 6000 3 Utility 18 Leeville 4 12 1 Koseq Skimming Arms (2) 35658 4000 2 Utility 12 Venice 4 12 1 

Recovered Oil Storage No 

Staging EDRC Storage Capacity VOO Persons Required From Hrs to Procure Hrs to Loadout Hrs to GOM 

K-Sea Operating (available through contract with CGA) 

PACIFIC 996165 NA 80000 1 Tug 6 Venice 4 12 4 DBL 76 1212984 NA 83937 1 Tug 6 Venice 4 12 4 DBL 81 1132231 NA 86948 1 Tug 6 Venice 4 12 4 
Staging Area: Venice 

Offshore Equipment With 

Staging EDRC Storage Capacity VOO Persons Req. From Hrs to Procure Hrs to Loadout Travel to Staging 

CGA 

FRU (1) + 100 bbl Tank (2) 3770 200 1 Utility 6 Belle Chasse 1 2 2 FRU (1) + 100 bbl Tank (2) 3770 200 1 Utility 6 Galveston 1 2 8 FRU (3) + 100 bbl Tank (5) 11310 500 1 Utility 6 Houma 1 2 3 FRU (1) + 100 bbl Tank (2) 3770 200 1 Utility 6 Ingleside 1 2 11 FRU (1) + 100 bbl Tank (2) 3770 200 1 Utility 6 Lake Charles 1 2 5.5 FRU (2) + 100 bbl Tank (4) 7540 400 1 Utility 6 Venice 1 2 0 Aqua Guard Triton RBS (2) 45560 4000 2 Utility 12 Galveston 4 12 8 

Offshore Equipment With 

Staging EDRC Storage Capacity VOO Persons Req. From Hrs to Procure Hrs to Loadout Travel to Staging 

CGA 

42” Auto Boom (5000’) NA NA 10 Crew 20 Belle Chasse 1 2 2 42” Auto Boom (5000’) NA NA 10 Crew 20 Galveston 1 2 8 42” Auto Boom (5000’) NA NA 10 Crew 20 Houma 1 2 3 42” Auto Boom (2500’) NA NA 6 Crew 12 Ingleside 1 2 11 42” Auto Boom (5000’) NA NA 10 Crew 20 Lake Charles 1 2 5.5 42” Auto Boom (2500’) NA NA 6 Crew 12 Pascagoula 1 2 4 1000’ Hydro-Fire Boom (In-Situ Burn) NA NA 8 Utility 40 Harvey 1 4 2 
Nearshore Response 

Nearshore Equipment No 

Staging EDRC Storage Capacity VOO Persons Required From Hrs to Procure Hrs to Loadout Hrs to GOM 

K-Sea Operating (available through contract with CGA) 

DBL 82 1137538 NA 86948 1 Tug 6 Venice 4 12 4 

CGA 

46’ FRV 5000 65 NA 4 Galveston 1 0 0 46’ FRV 5000 65 NA 4 Houma 1 0 2 46’ FRV 5000 65 NA 4 Lake Charles 1 0 1 46’ FRV 5000 65 NA 4 Venice 1 0 1 Trinity SWS 21500 249 NA 4 Morgan City 1 2 2 

Staging Area: Venice 

Nearshore and Inland 

Skimmers With Staging EDRC Storage Capacity VOO Persons Req. From Hrs to Procure Hrs to Loadout Travel to Staging T

De

CGA 

SWS Egmopol 3000 100 NA 3 Galveston 1 2 8 SWS Egmopol 3000 100 NA 3 Houma 1 2 3 SWS Marco 3588 34 NA 3 Houma 1 2 3 SWS Marco 3588 20 NA 3 Lake Charles 1 2 5.5 Rope Mop 77 2 0 3 Belle Chasse 1 2 2 RO Storage Barge NA 249 Towed 0 Galveston 1 2 8 RO Storage Barge NA 249 Towed 0 Houma 1 2 3 RO Storage Barge NA 249 Towed 0 Lake Charles 1 2 5.5 RO Storage Barge NA 249 Towed 0 Venice 1 2 0 
Shoreline Protection 

Staging Area: Venice 

Shoreline Protection 

Boom VOO Persons Req. Storage/Warehouse Location Hrs to Procure Hrs to Loadout Travel to Staging Travel to Deployment 

AMPOL (available through MSA) 

42,000’ 18” Boom 16 Crew 40 New Iberia, LA 2 2 4 2 20,000’ 18” Boom 8 Crew 20 New Orleans, LA 2 2 2 2 

Oil Mop (available through MSA) 

10,000’ 18” Boom 4 Crew 10 New Iberia, LA 1 1 4 2 10,000’ 18” Boom 4 Crew 10 Houston, TX 1 1 7.5 2 

10,000 18” Boom 4 Crew 10 Port Arthur, TX 1 1 6.25 2 20,000 18” Boom 8 Crew 20 Belle Chasse, LA 1 1 1.75 2 10,000 18” Boom 4 Crew 10 Port Allen, LA 1 1 3.5 2 10,000 18” Boom 4 Crew 10 Houma, LA 1 1 3.5 2 15,000 18” Boom 6 Crew 14 Gretna, LA 2 2 2 2 

Beach Boom EDRC Storage Capacity VOO Persons Req. From Hrs to Procure Hrs to Loadout Travel to Staging T

De

CGA 

Beach Boom (2000’) NA NA NA 6 Galveston 1 2 8 Beach Boom (1000’) NA NA NA 4 Ingleside 1 2 11 Beach Boom (2000’) NA NA NA 6 Pascagoula 1 2 4 
Wildlife Response EDRC Storage Capacity VOO Persons Req. From Hrs to Procure Hrs to Loadout Travel to Staging T

De

CGA 

Wildlife Support Trailer NA NA NA 2 Houma 1 2 3 Bird Scare Guns (24) NA NA NA 2 Belle Chasse 1 2 2 Bird Scare Guns (12) NA NA NA 2 Galveston 1 2 8 Bird Scare Guns (24) NA NA NA 2 Houma 1 2 3 Bird Scare Guns (12) NA NA NA 2 Ingleside 1 2 11 Bird Scare Guns (24) NA NA NA 2 Lake Charles 1 2 5.5 Bird Scare Guns (24) NA NA NA 2 Pascagoula 1 2 4 

Response Asset Total 

Offshore EDRC 211,635 Offshore Recovered Oil Storage 270,585 Nearshore / Shallow Water EDRC 54,753 Nearshore / Shallow Water Recovered Oil Storage 88,709 
APPENDIX I 

ENVIRONMENTAL MONITORING INFORMATION

(30 CFR PART 250.221 AND 250.252) 

A. Monitoring Systems

LLOG subscribes to Impact Weather Service which provides access to real-time 

weather conditions, and provides periodic updates on impending inclement weather 

conditions such as tropical depressions, storms and/or hurricanes entering the Gulf of 

Mexico. 

LLOG also relies on the National Weather Service to support the aforementioned 

subscribed service. During impending inclement weather conditions, LLOG closely 

coordinates the activity with our contractors and field personnel to ensure the safety of 

people for evacuation; measures to prepare the facility for evacuation to ensure 

protection of the environment and the facility/equipment. 

Mississippi Canyon Block 301 is in water depths greater than 400 meters (1,312’); 

therefore LLOG will follow the guidelines of the applicable NTL 2009-G02 by 

monitoring and gathering ocean current data using Acoustic Doppler Current Profile 

(ADCP) while the MODU is on location. 

B. Incidental Takes

LLOG does not anticipate the incidental taking of any species as a result of the 

proposed activities based on the implementation of, and adherence to, the NTL 2007-

G03 “Marine Trash and Debris Awareness Training and Elimination” and NTL 2007-

G04 “Vessel Strike Avoidance and Injured/Dead Protected Species Reporting”. 

C. Flower Garden Banks National Marine Sanctuary

This section of the plan is not applicable to the proposed operations. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 33

 
APPENDIX J 

LEASE STIPULATIONS/SPECIAL CONDITIONS INFORMATION

(30 CFR PART 250.222 AND 250.253) 

A. Lease Stipulations

Minerals Management Service (BOEMRE) invoked Stipulation No. 6 – Marine 

Protected Species, Lease OCS-G-24069, Mississippi Canyon Block 301. 

Lease Stipulation No. 6 is to reference measures to minimize or avoid potential adverse 

impacts to protected species (sea turtles, marine mammals, gulf sturgeon, and other 

federally protected species). BOEMRE has issued Notice to Lessees NTL 2007-G02 

“Implementation of Seismic Mitigation Measures and Protected Species Observer 

Program”, NTL 2007-G04 “Vessel Strike Avoidance and Injured/Dead Protected 

Species Reporting” and NTL 2007-G03 “Marine Trash and Debris Awareness and 

Elimination”. 

B. Special Conditions

• Subsea Completions

LLOG may potentially complete the proposed wells as subsea completions. 

Therefore, LLOG will follow the regulations in Title 30 CFR Parts 250.288 

through 250.290, which mandates the submittal and approval of separate 

regulatory filings entitled a “Conservation Information Document” and a 

“Deepwater Operations Plan”, respectively. 

 

• Ocean Current Monitoring

The proposed operations under this Plan are in water depths greater than 400 

meters (1,312’); therefore, LLOG will follow the guidelines of the applicable 

NTL 2009-G02 by continuously monitoring and gathering ocean current data 

using Acoustic Doppler Current Profile (ADCP) while the MODU is on 

location. 

• Breton Sound Area

Mississippi Canyon Block 301 is located within the 200 km zone of the Breton 

National Wildlife Refuge, and will consider the use of best available control 

technology as required if the projected air emissions are determined to 

significantly affect the air quality of an onshore area. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 34

 
APPENDIX K 

ENVIRONMENTAL MITIGATION MEASURES INFORMATION

(30 CFR Part 250.23 and 250.54) 

A. Measures Taken to Avoid, Minimize, and Mitigate Impacts

This section does not apply to the operations as proposed herein. 

B. Incidental Takes

LLOG does not anticipate the incidental taking of any species as a result of the 

proposed activities based on the implementation of, and adherence to, the NTL 2007-

G03 “Marine Trash and Debris Awareness Training and Elimination” and NTL 2007-

G04 “Vessel Strike Avoidance and Injured/Dead Protected Species Reporting”. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 35

 
APPENDIX L 

RELATED FACILITIES AND OPERATIONS INFORMATION

(30 CFR PART 250.256) 

A. Produced Liquid Hydrocarbon Transportation Vessels

Not applicable to proposed operations. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/8/2011 

Supplemental Exploration Plan 36

 
APPENDIX M 

SUPPORT VESSELS AND AIRCRAFT INFORMATION

(30 CFR PART 250.224 AND 250.257) 

A. General

Personnel involved in the proposed operations will typically use their own vehicles as 

transportation to and from the selected onshore base; whereas the selected vendors will 

transport the equipment by a combination of trucks, boats and/or helicopters to the 

onshore base. The personnel and equipment will then be transported to the drilling rig 

via the transportation methods and frequencies shown, taking the most direct route 

feasible as mandated by weather and traffic conditions: 

Type Maximum Fuel 

Tank Storage 

Capacity 

Maximum No. in 

Area at Any Time 

Trip Frequency or 

Duration 

Tug Boats 2,600 bbls 2 Two days per well 

Supply Boats 1,875 bbls 1 Three times weekly 

Crew Boats 809 bbls 1 Weekly 

Aircraft 1912 lbs 1 As Needed 

B. Diesel Oil Supply Vessels

Size of Fuel Supply 

Vessel 

Capacity of fuel 

Supply Vessel 

Frequency of Fuel 

Transfers 

Route Fuel Supply 

Vessel Will Take 

180’ OSV 1900 bbls 1/weekly Fourchon, LA to 

Mississippi Canyon 

Block 301 

C. Drilling Fluids Transportation

See Table 2 – Wastes you will Transport and/or Dispose of Onshore, located in 

Appendix F of this Plan. 

D. Solid and Liquid Wastes Transportation

See Table 2 – Wastes you will Transport and/or Dispose of Onshore, located in 

Appendix F of this Plan. 

E. Vicinity Map

A Vicinity Plat showing the location of Mississippi Canyon 301 relative to the nearest 

shoreline and onshore base is included as Attachment M. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/8/2011 

Supplemental Exploration Plan 37

 
Vicinity Map

Attachment M 

(Public Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 38

 

APPENDIX N

ONSHORE SUPPORT FACILITIES INFORMATION

(30 CFR PART 250.225 AND 250.258) 

 A. General

The proposed surface disturbances in Mississippi Canyon Block 301 will be located 

approximately 63 statute miles from the nearest Louisiana shoreline, and 

approximately 129 statute miles from the following onshore support base: 

Name Location Existing/New/Modified

Martin North Fourchon, LA Existing 

LLOG will use an existing onshore base to accomplish the following routine 

operations: 

● Loading/Offloading point for equipment supporting the offshore operations. 

● Dispatching personnel and equipment, and does not anticipate the need for any 

expansion of the selected facilities as a result of the activities proposed in this 

Revised Plan. 

● Temporary storage for materials and equipment. 

● 24 Hour Dispatcher 

B. Support Base Construction or Expansion

The proposed operations are temporary in nature and do not require any immediate 

action to acquire additional land or expand existing base facilities. 

C. Support Base Construction or Expansion Timetable

This section of the plan is not applicable to the proposed operations. 

 

D. Waste Disposal

See Table 2 – Wastes you will Transport and/or Dispose of Onshore, located in 

Appendix F of this Plan. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 39

 
APPENDIX O

 COASTAL ZONE MANAGEMENT ACT (CZMA) INFORMATION

(30 CFR PART 250.226 AND 250.260) 

A. Consistency Certification

. 

A certificate of Coastal Zone Management Consistency for the States of Louisiana, 

Alabama and Mississippi are enclosed as Attachment N

B. Other Information

Included as Attachment O are the enforceable policies from the States of Alabama and 

Mississippi that are related to OCS Plan Filings. 

LLOG has considered all of Louisiana’s enforceable policies and certifies the 

consistency for the proposed operations. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 40

 
Coastal Zone Management Consistency Statement for the 

States of Louisiana, Alabama and Mississippi

Attachment N 

(Public Information) 

 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 41

 



Coastal Zone Management Enforceable Policies for the 

States of Alabama and Mississippi

Attachment O 

(Public Information) 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 42

 
ALABAMA COASTAL ZONE MANAGEMENT 

CONSISTENCY CERTIFICATION 

SUPPLEMENTAL EXPLORATION PLAN 

MISSISSIPPI CANYON 301 

OCS-G-24069 

The OCS related oil and gas development activities having potential impact on the Alabama 

Coastal Zone are based on the location of the proposed facilities, access to those sites, best 

practical techniques for operations and production equipment, guidelines for the prevention 

of adverse environmental effects, effective environmental protection, emergency plans and 

contingency plans. Alabama policies have been addressed below or are cross referenced to 

the appropriate sections of the Plan: 

Topic Cross 

Reference

Comments 

Coastal Resource Use Policies 

Coastal Development Dock and port facilities in Louisiana will be used. There 

will be no new construction, dredging or filling in 

Alabama state waters. There will be no new commercial 

development or capital improvements in Alabama’s 

coastal zone, nor will there be any employment effects. 

Mineral Resource Exploration 

and Extraction 

Proposed development operations will take place 107 

statute miles from Alabama’s coastline 

Commercial Fishing Appendix H 

Hazard Management Appendix C A Shallow Hazards Report was previously submitted to 

BOEMRE in order to identify and assess the seafloor 

and shallow geologic conditions in this block 

Shoreline Erosion Appendix H Proposed development operations will take place 107 

statute miles from Alabama’s coastline 

Recreation Appendix H 

Transportation Appendix B 

Natural Resource Protection 

Policies 

Biological Productivity Appendix H 

Water Quality Appendix H 

Water Resources Appendix H 

Air Quality Appendix G 

Wetlands and Submerged 

Grassbeds 

Appendix H 

Beach and Dune Protection Appendix H 

Wildlife Habitat Protection Appendix H 

Endangered Species Appendix H 

Cultural Resources Protection Appendix D Mississippi Canyon Block 301 has been determined to 

have a high potential for containing archaeological 

properties. An archaeological report was submitted to 

BOEMRE under separate cover. 
As authorized by the Federal Zone Management Act (CZMA), the 

State of Mississippi developed a Coastal Management Program 

(CMP) to allow for the review of proposed Federal license and 

permit activities affecting any coastal use or resources in or 

outside the Mississippi Coastal Zone. 

The OCS related oil and gas exploration and development activities having potential 

impact on the Mississippi Coastal Zone are based on the location of the proposed 

facilities, access to those sites, best practical techniques for drilling locations, drilling 

equipment guidelines for the prevention of adverse environmental protection, emergency 

plans and contingency plans. 

The proposed activities addressed in this Plan are located approximately 116 miles 

from the nearest Mississippi Coastline. 

Below are the goals identified by the State of Mississippi and LLOG’s response: 

Goal 1: To provide for reasonable industrial expansion in the coastal area and to 

ensure the efficient utilization of waterfront industrial sites so that suitable sites are 

conserved for water dependent industry. 

The proposed activities are located in OCS Federal Waters, Gulf of Mexico, 

approximately 63 miles from the nearest Louisiana shoreline. LLOG Exploration 

Offshore, L.L.C. (LLOG) will utilize existing facilities in Fourchon, Louisiana. 

Therefore, there should not be any anticipated or planned adverse impacts to 

Mississippi’s coastal area. 

Goal 2: To favor the preservation of the coastal wetlands and ecosystems, except 

where a specific alternation of specific coastal wetlands would serve a higher public 

interest in compliance with the public purposes of the public trust in which the 

coastal wetlands are held. 

The proposed activities are located in OCS Federal Waters, Gulf of Mexico, 

approximately 116 miles from the Mississippi coastline and 63 miles from the nearest 

Louisiana shoreline. LLOG will utilize existing facilities in Fourchon, Louisiana. 

Therefore there should not be any anticipated or planned adverse impacts to Mississippi’s 

coastal wetlands and ecosystems. 
Goal 3: To protect, propagate and conserve the State’s seafood and aquatic life in 

connection with the revitalization, and conserve the State’s seafood and aquatic life 

in connection with the revitalization of the seafloor industry of the State of 

Mississippi.

 The proposed activities are located in OCS Federal Waters, Gulf of Mexico, 

approximately 116 from the Mississippi coastline and 63 miles from the nearest 

Louisiana shoreline. LLOG will utilize existing facilities in Fourchon, Louisiana. 

Therefore, there should not be any anticipated or planned adverse impacts to 

Mississippi’s seafood and aquatic life. 

Goal 4: To conserve the air and waters of the State, and to protect, maintain and 

improve the quality thereof for public use, for the prorogation of wildlife, fish, and 

aquatic life and for domestic, agricultural, industrial, recreational, and other 

legitimate beneficial uses. 

The activities proposed in this Plan are located in OCS Federal Waters and will 

use existing facilities located in Louisiana; therefore, there should be no adverse impacts 

to Mississippi air and water quality. 

For the activities scheduled in this Plan, LLOG is proposing to discharge 

authorized effluents into the receiving waters of the Gulf of Mexico. Overboard 

discharges (i.e. drilling fluids and associated cuttings) associated with the proposed 

activities must be tested first for toxicity limitations as mandated by EPA’s General 

Permit GMG290000. Other solid waste such as comminuted food will first pass through 

a 25 mm type mesh screen, as regulated by the US Coast Guard’s Marine Pollution 

Research and Control Act (MARPOL) of 1987. 

Activities proposed in this plan will be conducted in accordance with LLOG’s 

approved Oil Spill Response Plan. 

An Air Quality Review has been performed addressing the activities proposed in 

this Plan and emissions for all parameters are below exemption limitations. 

Goal 5: To put to beneficial use to the fullest extent of which they are capable the 

water resources of the state, and to prevent the waste, unreasonable use, or 

unreasonable method of use of water. 

The activities proposed in this Plan are located in OCS Federal Waters and will 

use existing facilities located in Louisiana; therefore, there should be no adverse impacts 

to Mississippi water resources. Activities proposed in this Plan will be conducted in 

accordance with LLOG’s approved Regional Oil Spill Response Plan. 
Goal 6: To preserve the state’s historical and archaeological resources, to prevent 

their destruction, and to enhance these resources wherever possible. 

The activities proposed in this Plan are located in OCS Federal Waters and will 

use existing facilities located in Louisiana; therefore, there should be no adverse 

impacts to Mississippi historical and archaeological resources. 

Goal 7: To encourage preservation of natural scenic qualities in the coastal area. 

The activities proposed in this Plan are located in OCS Federal Waters and will 

use existing facilities located in Louisiana; therefore there should be no adverse 

impacts to Mississippi coastal area natural scenic qualities. 

Goal 8: To assist local governments in the provision of public facilities services in a 

manner consistent with the coastal program. 

The activities proposed in this Plan are located in OCS Federal Waters and will 

use existing facilities located in Louisiana; therefore, there should be no affect on 

Mississippi local governments.
APPENDIX P 

ENVIRONMENTAL IMPACT ANALYSIS

(30 CFR PART 250.227 AND 250.261) 

A. Impact Producing Factors (IPF’s) From Proposed Activities

The following matrix is utilized to identify the affected environments that could be 

impacted by these IPF’s. An “x” has been marked for each IPF category that LLOG 

has determined may impact a particular environment as a result of the proposed 

activities. For those cells which are footnoted, a statement is provided as to the 

applicability of the proposed activities, and where there may be an effect, an 

analysis of the effect is provided. 

Environmental Resources Impact Producing Factors (IPF’s) 

Emissions 

(air, noise, 

light, etc) 

Effluents 

(muds, cuttings, 

other discharges 

to the water 

column or 

seafloor) 

Physical 

disturbances 

to the seafloor 

(rig, anchor, 

structure 

emplacement, 

etc.) 

Wastes sent 

to shore for 

treatment 

or disposal 

Accidents 

(e.g., oil 

spills, 

chemical 

spills, H2S 

releases) 

Discarded 

Trash & 

Debris 

Site Specific at Offshore 

Location

Designated topographic 

features 

(1) (1) (1) 

Pinnacle Trend area live 

bottoms 

(2) (2) (2) 

Eastern Gulf live bottoms (3) (3) (3) 

Chemosynthetic communities X X (4) 

Water quality X X 

Fisheries X

Marine mammals X (8) X (8) 

Sea turtles X (8) X (8) 

Air quality X (9) 

Shipwreck sites (known or 

potential) 

(7) 

Prehistoric archaeological sites (7) 

Vicinity of Offshore Location

Essential fish habitat X (6) 

Marine and pelagic birds X

Public health and safety (5) 

Coastal and Onshore

Beaches X (6) 

Wetlands X (6) 

Shorebirds and coastal nesting 

birds 

X (6) 

Coastal wildlife refuge X

Wilderness areas X

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 43

 
Footnotes for Environmental Impact Analysis Matrix: 

1. Activities that may affect a marine sanctuary or topographic feature. Specifically, if the well or platform site 

or any anchors will be on the seafloor within the: 

(a) 4-mile zone of the Flower Gardens Banks, or the 3-mile zone of Stetson Bank; 

(b) 1000-m, 1-mile or 3-mile zone of any topographic feature (submarine bank) protected by the 

Topographic Features Stipulation attached to an OCS lease; 

(c) Essential Fish Habitat (EFH) criteria of 500 feet from any no-activity zone; or 

(d) Proximity of any submarine bank (500 ft buffer zone) with relief greater than 2 meters that is not 

protected by the Topographic Stipulation attached to an OCS lease. 

2. Activities with any bottom disturbance within an OCS lease block protected through the Live Bottom 

(Pinnacle Trend) Stipulation attached to an OCS lease. 

3. Activities within any Eastern Gulf OCS block where seafloor habitats are protected by the Live Bottom (LowRelief) Stipulation attached to an OCS lease. 

4. Activities on blocks designated by the BOEMRE as being in water depths 300 meters or greater. 

5. Exploration or production activities where H2S concentrations greater than 500 ppm might be encountered. 

6. All activities that could result in an accidental spill of produced liquid hydrocarbons or diesel fuel that you 

determine would impact these environmental resources. If the proposed action is located a sufficient distance 

from a resource that no impact would occur, the EIA can note that in a sentence or two. 

7. All activities that involve seafloor disturbances, including anchor emplacements, in any OCS block designated 

by the BOEMRE as having high-probability for the occurrence of shipwrecks or prehistoric sites, including 

such blocks that will be affected that are adjacent to the lease block in which your planned activity will occur. 

If the proposed activities are located a sufficient distance from a shipwreck or prehistoric site that no impact 

would occur, the EIA can note that in a sentence or two. 

8. All activities that you determine might have an adverse effect on endangered or threatened marine mammals 

or sea turtles or their critical habitats. 

9. Production activities that involve transportation of produced fluids to shore using shuttle tankers or barges. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 44

 
B. Impact Analysis

LLOG does not anticipate any unforeseen incidents from the proposed activities which 

could significantly impact the associated environment. LLOG activities associated with 

this Exploration Plan (Plan) will be performed with prudent and industry accepted 

standards, and in compliance with the federal agency regulations and oversight. 

The “Oil Spills Information” Section of this Plan details the potential worse case 

discharge volume which has been calculated based on the new Bureau of Ocean Energy 

Management, Regulation and Enforcement (BOEMRE) Notice to Lessees (NTL 2010-

N06). Response details associated with an unanticipated spill from this site are detailed 

in our Regional Oil Spill Response Plan (OSRP) which outlines the potential spill 

scenario, spill volumes, anticipated trajectory of the spill, response equipment available, 

and actions to be taken to respond to the potential spill incident. Additional measures 

implemented by LLOG is trajectory analyses to be obtained prior to and during the 

proposed activities, contractual arrangements with well control specialists and 

preliminary reviews of potential well intervention scenarios, and to supplement existing 

contracted response/clean-up equipment with equipment offered by Helix which 

specializes in subsea deepwater well intervention, containment and processing. 

 Site Specific at Offshore Location

• Designated Topographic Features

There are no anticipated emissions, effluents, physical disturbances to the 

seafloor, wastes transported to shore, and/or accidents from the proposed 

activities that could cause impacts to topographic features. 

The proposed surface disturbances within Mississippi Canyon Block 301 are 

located approximately 70 miles away from the closest designated topographic 

feature (Sackett Bank). 

The crests of these designated topographic features in the northern Gulf are 

typically found below 10 m; therefore, concentrated oil from a surface spill is 

not likely to reach sessile biota. Subsurface spills could cause adverse impacts 

to a designated topographic feature; however, due to the offset distance this 

should not have an impact. 

In the event of an unanticipated spill, LLOG would immediately implement its 

Regional Oil Spill Response Plan and active source control and countermeasures 

to minimize these potential impacts. 

 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 45

 
• Pinnacle Trend Area Live Bottoms

There are no anticipated emissions, effluents, physical disturbances to the 

seafloor, wastes sent to shore and/or accidents from the proposed activities that 

could cause impacts to a pinnacle trend area. 

The proposed surface disturbances within Mississippi Canyon Block 301 is 

located a significant distance (> 100 miles) from the closest pinnacle trend live 

bottom stipulated block. The crests of these pinnacle trend areas are much 

deeper than 20 m. 

During the surface location disturbance review, LLOG reviews potential surface 

impacts, and would be able to identify any pinnacles within the vicinity and 

would avoid placement of any surface disturbances such as a drilling rig and 

associated anchors. These surface location disturbance areas would be avoided 

and/or mitigated during the review and approval process by the BOEM. 

In the event of an unanticipated spill, LLOG would immediately implement its 

Regional Oil Spill Response Plan and activate source control and 

countermeasures to minimize these potential impacts. 

• Eastern Gulf Live Bottoms

There are no anticipated emissions, effluents, emissions physical disturbances to 

the seafloor, wastes sent to shore, and/or accidents from the proposed activities 

that could cause impacts to Eastern Gulf live bottoms. 

The proposed surface disturbance within Mississippi Canyon Block 301 is 

located a significant distance (> 100 miles) from the closest Eastern Gulf live 

bottoms stipulated block. During the surface location disturbance review, 

LLOG previews potential surface impacts, and would be able to identify any 

live bottom areas within the vicinity and would avoid placement of any surface 

disturbances such as a drilling rig and associated anchors. 

In the event of an unanticipated spill, LLOG would immediately implement its 

Regional Oil Spill Response Plan and activate source control and 

countermeasures to minimize these potential impacts. 

• Chemosynthetic Communities

Water depths at the surface location in Mississippi Canyon Block 301 is 

approximately 6,150 feet including anchor radius. As noted in the shallow 

hazards assessment (Attachment I) it is unlikely that the identified anomalies 

represent the presence of high-density chemosynthetic or other benthic 

communities. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 46

 
• Water Quality

Bottom disturbances which may result based on placement of drilling rigs 

during an exploratory phase could increase water column turbidity and 

redistribution of any accumulated pollutants in the water column; which could 

cause temporary impacts on water quality conditions in the immediate vicinity. 

Associated overboard effluents are regulated by the EPA Region VI NPDES 

General Permit GMG290000 which mandates volume discharge rate limitations, 

certain testing requirements for toxicity and oil and grease limitations. As such, 

it is not anticipated these discharges authorized under the approved EPA 

NPDES permit will cause significant adverse impacts to water quality. 

Certain wastes generated from the proposed activities will be manifested and 

sent to shore for treatment and/or disposal at approved facilities. Other waste 

which may be considered hazardous will be collected and transported in sealed 

containers and transported to approve disposal sites in accordance with the 

RCRA regulations and guidelines. 

An accidental oil spill release from the proposed activities, and cumulative 

similar discharge activity within the vicinity could potentially cause temporary 

impacts to water quality. In the event of such a release, the water quality would 

be temporarily affected by the dissolved components and small droplets. 

Currents and microbial degradation would remove the oil from the water column 

or dilute the constituents to background levels. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

• Fisheries

Accidental oil spill releases from the proposed activities, and cumulative similar 

discharge activity within the vicinity may potentially cause some detrimental 

effects on fisheries. It is unlikely a spill would occur; however, such a release in 

open waters closed to mobile adult finfish or shellfish would likely be sub-lethal 

and the extent of damage would be reduced to the capability of adult fish and 

shellfish to avoid a spill, to metabolize hydrocarbons, and to excrete both 

metabolites and parent compounds. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 47

 
activate source control and countermeasures to minimize these potential 

impacts. 

• Marine Mammals

GulfCet II studies reveal that cetaceans of the continental shelf and shelf edge 

are comprised of bottlenose dolphin and Atlantic spotted dolphin. Squid eaters, 

including dwarf and pygmy killer whale, Risso’s dolphin and Cuvier’s beaked 

whale occur most frequently along the upper slope in areas outside of 

anticyclones. 

As a result of the proposed activities, marine mammals may be adversely 

impacted by emissions, effluents, waste sent to shore and/or accidents. 

Chronic and sporadic sub-lethal effects would occur that may stress and/or 

weaken individuals of a local group or population and make them more 

susceptible to infection from natural or anthropogenic sources. Few lethal 

effects are expected from an accidental oil spill, chance collisions with service 

vessels and ingestion of plastic material. 

The net results of any disturbance would depend on the size and percentage of 

the population affected, ecological importance of the disturbed area, 

environmental and biological parameters that influence an animal’s sensitivity to 

disturbance and stress, and the accommodation time in response to prolonged 

disturbance (Geraci and St. Aubin, 1980). Collisions between cetaceans and 

ship could cause serious injury or death (Laist et al., 2001). 

Sperm whales are one of 11 whale species that are hit commonly by ships (Laist 

et al., 2001). Collisions between OCS vessels and cetaceans within the project 

area are expected to be unusual events. 

LLOG does not anticipate the incidental taking of any marine mammals as the 

result of the proposed activities. The proposed activities will be conducted by 

our company and its contractors under the additional criteria addressed by 

BOEMRE in Notice to Lessees (NTLs) 2007-G04 “Vessel Strike Avoidance and 

Injured/Dead Protective Species” and 2007-G03 “Marine Trash & Debris 

Awareness & Elimination”. The proposed operations will be conducted in 

accordance with the regulations via manifesting waste sent to shore and ensuring 

such wastes are contained to prevent loss. Informational placards will be 

maintained on the facility, and LLOG and the associated contractors obtain 

training on at least an annual basis to ensure personnel are aware of the reporting 

and operational requirements. 

LLOG will conduct the proposed activities under EPA’s Region VI NPDES 

General Permit GMG290000 which authorizes the discharge of certain effluents, 

subject to certain limitations, prohibitions and recordkeeping requirements. As 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 48

 
such, it is not anticipated these discharges authorized under the approved EPA 

NPDES permit will not cause significant adverse impacts to water quality. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

• Sea Turtles

Small numbers of turtles could be killed or injured by chance collision with 

service vessels or by eating indigestible trash, particularly plastic items 

accidentally lost from drilling rigs, production facilities and service vessels. 

Drilling rigs and project vessels produce noise that could disrupt normal 

behavior patterns and create some stress to sea turtles, making them more 

susceptible to disease. Accidental oil spill releases are potential threats which 

could have lethal effects on turtles. Contact and/or consumption of this released 

material could seriously affect individual sea turtles. Most OCS related impacts 

on sea turtles are expected to be sub-lethal. Chronic and/or avoidance of 

affected areas could cause declines in survival or productivity, resulting in 

gradual population declines. 

LLOG will conduct the proposed activities under EPA’s Region VI NPDES 

General Permit GMG290000 which authorizes the discharge of certain effluents, 

subject to certain limitations, prohibitions and recordkeeping requirements. As 

such, it is not anticipated these discharges authorized under the approved EPA 

NPDES permit will not cause significant adverse impacts to water quality. 

Additionally, LLOG and its contractors will conduct the proposed activities 

under the additional criteria addressed by BOEMRE in Notice to Lessees 

(NTLs) 2007-G04 “Vessel Strike Avoidance and Injured/Dead Protective 

Species” and 2007-G03 “Marine Trash & Debris Awareness & Elimination”. 

The proposed operations will be conducted in accordance with the regulations 

via manifesting waste sent to shore and ensuring such wastes are contained to 

prevent loss. Informational placards will be maintained on the facility, and 

LLOG and the associated contractors obtain training on at least an annual basis 

to ensure personnel are aware of the reporting and operational requirements. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 49

 
• Air Quality

The proposed activities are located approximately 63 miles to the nearest 

shoreline. LLOG has addressed the air quality issues associated with the 

proposed activities in the “Air Emissions Information” section of this Plan as a 

result of the proposed activities. 

• Ship Wreck Sites (Known or Potential)

There are no physical disturbances to the seafloor which could impact known or 

potential shipwreck sites, as the review of high resolution shallow hazards data 

indicate there are no known or potential shipwreck sites located within the 

survey area. As such, LLOG does not anticipate any IPF’s as a result of the 

proposed activities. 

• Prehistoric Archaeological Sites

There are no physical disturbances to the seafloor which could cause impacts to 

prehistoric archaeological sites, as the review of high resolution shallow hazards 

data and supporting studies did not reflect the occurrence of prehistoric 

archaeological sites. As such LLOG does not anticipate any IPF’s as a result of 

the proposed activities. 

Vicinity of Offshore Location

• Essential Fish Habitat

As a result of the proposed activities, essential fish habitat may be adversely 

impacted by effluents and/or accidents. 

An Accidental oil spill that may occur as a result of the proposed activities has 

potential to cause some detrimental effects on essential fish habitat. It is 

unlikely that an accidental oil spill release would occur; however, if a spill were 

to occur in close proximity to finfish or shellfish, the effects would likely be 

sub-lethal and the extent of damage would be reduced to the capability of adult 

fish and shellfish to avoid a spill, to metabolize hydrocarbons and to excrete 

both metabolites and parent compounds. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 50

 
• Marine and Pelagic Birds

As a result of the proposed activities, marine and pelagic birds may be adversely 

impacted by an accidental oil spill, by the birds coming into contact with the 

released oil. 

In the event of an unanticipated blowout resulting in an oil spill, it is likely to 

have an impact based on the industry wide standards for using proven equipment 

and technology for such responses. In that event, LLOG will implement the 

Regional Oil Spill Response Plan and activate source control and 

countermeasures to minimize these potential impacts. 

• Public Health and Safety

There are no anticipated emissions, effluents, wastes sent to shore, and/or 

accidents from the proposed activities that could cause impacts to the public 

health safety. LLOG has requested BOEMRE approval to classify the proposed 

objective area as absent of hydrogen sulfide. 

Coastal and Onshore

• Beaches

As a result of the proposed activities, beaches may be adversely impacted by an 

accidental oil spill. However, due to the distance from shore (approximately 63 

miles), and the response capabilities that would be implemented, no significant 

adverse impacts are expected. Both historical spill data and the combined 

trajectory/risk calculations referenced in the publication of OCS EIA/EA 

BOEMRE 2002-052 indicate there is little risk of contact or impact to the 

coastline and associated environmental resources. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

• Wetlands

As a result of the proposed activities, wetlands may be adversely impacted by an 

accidental oil spill. However, due to the distance from shore (approximately 63 

miles) and the response capabilities that would be implemented, no significant 

adverse impacts are expected. Both historical spill data and the combined 

trajectory/risk calculations referenced in the publication of OCS EIA/EA 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 51

 
BOEMRE 2002-052 indicate there is little risk of contact or impact to the 

coastline and associated environmental resources. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

• Shore Birds and Coastal Nesting Birds

As a result of the proposed activities, shore birds and coastal nesting birds may 

be adversely impacted by an accidental oil spill. However, due to the distance 

from shore (approximately 63 miles) and the response capabilities that would be 

implemented, no significant adverse impacts are expected. Both historical spill 

data and the combined trajectory/risk calculations referenced in the publication 

of OCS EIA/EA BOEMRE 2002-052 indicate there is little risk of contact or 

impact to the coastline and associated environmental resources. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

• Coastal Wildlife Refuges

As a result of the proposed activities, coastal wildlife refuges may be adversely 

impacted by an accidental oil spill. However, due to the distance from shore 

(approximately 63 miles) and the response capabilities that would be 

implemented, no significant adverse impacts are expected. Both historical spill 

data and the combined trajectory/risk calculations referenced in the publication 

of OCS EIA/EA BOEMRE 2002-052 indicate there is little risk of contact or 

impact to the coastline and associated environmental resources. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

• Wilderness Area

As a result of the proposed activities, wilderness areas may be adversely 

impacted by an accidental oil spill. However, due to the distance from shore 

(approximately 63 miles) and the response capabilities that would be 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 52

 
implemented, no significant adverse impacts are expected. Both historical spill 

data and the combined trajectory/risk calculations referenced in the publication 

of OCS EIA/EA BOEMRE 2002-052 indicate there is little risk of contact or 

impact to the coastline and associated environmental resources. 

In the event of an unanticipated blowout, LLOG will implement industry wide 

standards for using proven equipment and technology for such responses. 

LLOG would immediately implement its Regional Oil Spill Response Plan and 

activate source control and countermeasures to minimize these potential 

impacts. 

Other Resources Identified

LLOG has not identified any other environmental resources other than those addressed 

above. 

C. Impacts of Proposed Activities

LLOG does not anticipate any impacts on the offshore site specific locations, offshore 

vicinity, and/or coastal and onshore environmental conditions based on the potential 

impacts identified in the EIA worksheets and historical operations in the exploration of 

this reservoir. 

D. Environmental Hazards

The Gulf of Mexico may experience several hurricanes throughout the season which 

typically runs from June through November. A severe hurricane may impact the 

activities covered in this Plan. Such impacts may be damage to the drilling rig, the 

unanticipated release of hydrocarbons depending upon the current status of the well. 

Additionally, the surface located in Mississippi Canyon Block 301 has the potential to 

be affected by the “Loop Current” which is a warm ocean current in the Gulf of Mexico 

that flows northward between Cuba and the Yucatan Peninsula, moves northward into 

the Gulf of Mexico, then loops east and south before exiting to the east through the 

Florida Straits. While the loop current is present approximately 95% of the time, it is 

most active in the summer and fall seasons. 

To mitigate potential impacts to the well during impending hurricanes or loop currents, 

LLOG will take precautionary measures by securing the well, rig and evacuation of 

personnel; and will comply with the requirements of NTL’s 2008-G09 and 2009-G10. 

E. Alternatives

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 53

 
LLOG did not consider any alternatives to reduce environmental impacts as a result of 

the proposed activities. 

F. Mitigation Measures

LLOG will not implement any mitigation measures to avoid, diminish or eliminate 

potential environmental resources, other than those required by regulation and policy. 

G. Consultation

LLOG has not contacted any agencies or persons for consultation regarding potential 

impacts associated with the proposed activities. Therefore, a list of such entities is not 

being provided. 

H. Preparers

Questions or requests for additional information should be made to LLOG’s authorized 

representative of this Plan: 

Kathy Gowland 

Regulatory Specialist 

1001 Ochsner Boulevard, Suite 2000 

Covington, Louisiana 70433 

985-801-4300 (Phone) 

 kathygo@llog.com 

I. References

The following documents were utilized in preparing the Environmental Impact 

Assessment: 

Document Author Dated 

Shallow Hazards Assessment, Benthic Communities 

Evaluation, and Archaeological Resources Survey 

Berger Geosciences, LLC 2011 

BOEMRE Environmental Impact Statement Report No. 

2007-003 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2007 

Title 30 CFR Part 250 Subpart B (250.216 / 250.221 / 

250.223 / 250.227 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2006 

NTL 2000-G16 “Guidelines for General Lease Surety 

Bonds” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2000 

NTL 2005-G07 “Archaeological Resource Surveys and 

Reports” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2005 

NTL 2006-N06 “Flaring and Venting Regulations” Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2006 

NTL 2006-G07 “Revisions to the List of OCS Lease Blocks 

Requiring Archaeological Surveys and Reports:” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2006 

NTL 2007-G02 “Implementation of seismic Survey 

Mitigation Measures and Protected Species Observer 

Program” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2007 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 54

 
NTL 2007-G03 “Marine Trash & Debris Awareness & 

Elimination” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2007 

NTL 2007-G04 “Vessel Strike Avoidance and Injured/Dead 

Protective Species” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2007 

NTL 2008-G04 “Information Requirements for Exploration 

Plans and Development Operations Coordination 

Documents” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2008 

NTL 2008-N05 “Guidelines for Oil Spill Financial 

Responsibility for Covered Offshore Facilities” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2008 

NTL 2008-G06 “Remotely Operated Vehicle Surveys in 

Deepwater” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2008 

NTL 2008-N07 “Supplemental Bond Procedures Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2008 

NTL 2008-G20 “Revisions to the List of OCS Lease Blocks 

Requiring Archaeological Resource Surveys and Reports” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2008 

NTL 2009-G02 “Ocean Current Monitoring” Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2009-G27 “Submitting Exploration Plans and 

Development Operations Coordination Documents” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2009-G29 “Implementation Plan for Transition from 

North American Datum 27 to North American Datum 83” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2009-G31 “Hydrogen Sulphide” Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2009-G34 “Ancillary Activities” Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2009-G38 “Drilling Windows, Eastern Gulf of 

Mexico” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2009-G39 “Biologically-Sensitive Underwater 

Features and Areas” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2009-G40 “Deepwater Benthic Communities” Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2009-N11 “Air Quality Jurisdiction on the OCS” Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2009 

NTL 2010-N05 “Increased Safety Measures for Energy 

Development on the OCS” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2010 

NTL 2010-N06 “Information Requirements for EP’s, 

DOCD’s, DPP on the OCS” 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2010 

NPDES General Permit GMG290000 EPA – Region VI 2007 

Regional Oil Spill Response Plan LLOG Exploration Offshore, L.L.C. 2010 

Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 55

 
Mississippi Canyon Block 301 (OCS-G 24069) 11/2/2011 

Supplemental Exploration Plan 56

 

APPENDIX Q 

ADMINISTRATIVE INFORMATION

(30 CFR Part 250.228 and 250.262) 

A. Exempted Information Description (Public Information Copies only

Excluded from the Public Information copies are the following: 

• Proposed bottomhole location information 

• Proposed total well depths (measured and true vertical depth) 

• Production Rates and Life of Reserves 

• New and Unusual Technologies 

• Geological and Geophysical Attachments 

B. Bibliography

The following documents were utilized in preparing this Plan: 

Document Author Dated 

Shallow Hazards Assessment, Benthic Communities 

Evaluation, and Archaeological Resources Survey 

Berger Geosciences, LLC 2011 

BOEMRE Environmental Impact Statement Report – No. 

2007-003 

Bureau of Ocean Energy Management, 

Regulation, and Enforcement 

2007 

Regional Oil Spill Response Plan LLOG Exploration Offshore, L.L.C. 2010