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-07635

Type - Supplemental Exploration Plan

Lease(s) - OCS-G31521 Block - 705 Mississippi Canyon Area

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

Well B

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.

Chiquita Hill

Plan Coordinator

Description -

Rig Type -

Subject:

From:

November 4, 2013
LLOG EXPLORATION OFFSHORE, 

L.L.C.

1001 Ochsner Boulevard, Suite 200 

Covington, Louisiana 70433 

SUPPLEMENTAL 

EXPLORATION PLAN

OCS-G-31521 LEASE

MISSISSIPPI CANYON BLOCK 705

PREPARED BY:

Kathy Gowland

Regulatory Specialist 

985-801-4300 (Main)

985-801-4317 (Direct)

kathygo@llog.com

September 25, 2013
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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), NTL 

No. 2008-G04 and NTL 2010-N06, LLOG Exploration Offshore, LLC proposes 

to supplement our previously approved Initial Exploration Plan (Control No. N9504) for the drilling, completion and testing and installation of subsea wellhead 

and/or manifold for proposed location “B”. The previously approved “A” 

location has not be drilled as of this date. 

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

which provides for the drilling, completion, and testing of Well Location B, 

Mississippi Canyon Block 705. 

 

(B) Location: 

Attachment B – Well Location Plat

Attachment C – Bathymetry Map detailing the proposed surface location 

disturbance area with the proposed anchor radius of the drilling 

rig.

(C) Safety & pollution features: 

LLOG will utilize a semi-submersible moored rig for the proposed operations. A 

description of the drilling unit is included on the OCS Plans Information Form. 

Rig specifications will be made part of the Application for Permit to Drill.

Safety features on the drilling unit will include well control, pollution prevention, 

and blowout prevention equipment as described in Title 30 CFR Part 250, 

Subparts C, D, E and G; and further clarified by BOEM’s Notices to Lessees, and 

currently policy making invoked by BOEM, EPA and USCG. Appropriate life 

rafts, life jackets, ring buoys, etc., will be maintained on the facility at all times.

Pollution prevention measures include installation of curbs, gutters, drip pans, and 

drains on the drilling deck areas to collect all contaminants and debris. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

(D) Storage Tanks and Vessels: 

Type of 

Storage Tank

Type of 

Facility

Tank 

Capacity 

(bbls)

Number of 

tanks

Total 

Capacity 

(bbls)

Fluid Gravity 

(API)

Fuel Oil 

(Marine 

Diesel)

SemiSubmersible95.24 2 190.5 No. 2 Diesel –

43

2917.8 4 11,671.2

Total 11,861.7

 

(E) Pollution Prevention Measures

 

LLOG does not propose any additional safety, pollution prevention or early spill 

detection measures beyond those required by 30 CFR Part 250. 

(F) Additional measures: No additional measures are proposed. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

OCS PLAN INFORMATION FORM

Attachment A

(Proprietary Information)

 
U.S. Department of the Interior OMB Control Number: 1010-0151

Bureau of Ocean Energy Management OMB Approval Expires: 12/31/14

 

OCS PLAN INFORMATION FORM 

General Information 

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

Company Name: BOEM Operator Number: 

Address: Contact Person: 

Phone Number: 

E-Mail Address: 

If a service fee is required under 30 CFR 550.125(a), provide the Amount paid Receipt No. 

Project and Worst Case Discharge (WCD) Information

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

Objective(s) Oil Gas Sulphur Salt Onshore Support Base(s): 

Platform/Well Name: Total Volume of WCD: API Gravity: 

Distance to Closest Land (Miles): Volume from uncontrolled blowout: 

Have you previously provided information to verify the calculations and assumptions for your WCD? Yes No 

If so, provide the Control Number of the EP or DOCD with which this information was provided 

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

Do you propose to use a vessel with anchors to install or modify a structure? Yes No 

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

Description of Proposed Activities and Tentative Schedule (Mark all that apply) 

Proposed Activity Start Date End Date No. of Days 

Exploration drilling 

Development drilling 

Well completion 

Well test flaring (for more than 48 hours) 

Installation or modification of structure 

Installation of production facilities 

Installation of subsea wellheads and/or manifolds 

Installation of lease term pipelines 

Commence production 

Other (Specify and attach description) 

Description of Drilling Rig Description of Structure 

Jackup Drillship Caisson Tension leg platform

Gorilla Jackup Platform rig Fixed platform Compliant tower 

Semisubmersible Submersible Spar Guyed tower

DP Semisubmersible Other (Attach Description) 

Drilling Rig Name (If Known): 

Floating production 

system 

Other (Attach Description) 

Description of Lease Term Pipelines 

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

Form BOEM- 0137 (December 2011- Supersedes all previous editions of this form which may not be used.) Page 1 of 4
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
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

WELL LOCATION PLAT

Attachment B

(Proprietary Information)

Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

BATHYMETRY MAP

Attachment C

(Public Information)

Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 in this Initial Plan. 

D. Bonding Statement

The bond requirements for the activities and facilities proposed in this Initial 

Exploration Plan are satisfied by an area wide bond, furnished and maintained 

according to 30 CFR Part 256; subpart I; NTL No. 2000-G16, “Guidelines for 

General Lease Surety Bonds,” and additional security under 30 CFR 256.53(d) 

and NTL No. 2008-N07 “Supplemental Bond 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 Initial EP according 

to 30 CFR Part 253, and NTL No. 2008-N05 “Guidelines for Oil Spill Financial 

Responsibility (OSFR) for Covered Facilities.” 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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

The Worst Case Discharge Calculations (Proprietary) were submitted to BOEM

under letter dated July 20, 2011 with the Initial Exploration Plan (N-9504). 

Blowout Scenario, including Site Specific Proposed Relief Well and Intervention 

Planning and Relief Well Response Time Estimate (Public Information) follows 

as Attachment D. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

NTL 2010-N06 Data 

BLOWOUT SCENARIO

Attachment D

(Public Information)
BLOWOUT SCENARIO

 MC 705

OCS-G-31521

Created by: S.L. Stegeman

Last Revised: 9/18/2013

Page 1 of 6 

Confidential

1 

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 705 OCS-G-31521 850 699,997’ 10,262,246’ 28° 14’ 52.023” 89° 55’ 16.539”

INFORMATION REQUIREMENTS

A) Blowout scenario

The MC 705 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 pre-existing 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 705

Facility Designation MODU

Distance to Nearest Shoreline (miles) ~53

Uncontrolled Blowout (Volume per day) 123,200 bbls

Type of Fluid Gas and Condensate

C) Total volume and maximum duration of the potential blowout

Duration of Flow (days) 99 days total (see Relief Well Response Estimate below)

Total Volume of Spill (bbls) 12.2 MMBO based on 99 days of uncontrolled flow

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

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 
BLOWOUT SCENARIO

 MC 705

OCS-G-31521

Created by: S.L. Stegeman

Last Revised: 9/18/2013

Page 2 of 6 

Confidential

2 

span of a few days, significantly reducing the outflow of the rates. For this blowout scenario, no 

bridging is considered. 

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 pre-programmed 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 an 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. 
BLOWOUT SCENARIO

 MC 705

OCS-G-31521

Created by: S.L. Stegeman

Last Revised: 9/18/2013

Page 3 of 6 

Confidential

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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. 

With the current activity level in the GOM, 25 to 35 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 • Diamond Ocean Victory (Moored Semi)

• Ensco 8502 (DP Semi) – 4 point mooring w/ DP assist

• Transocean DD1 or DD2 (DP Semi) – mooring capable

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 
BLOWOUT SCENARIO

 MC 705

OCS-G-31521

Created by: S.L. Stegeman

Last Revised: 9/18/2013

Page 4 of 6 

Confidential

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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. 

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).
BLOWOUT SCENARIO

 MC 705

OCS-G-31521

Created by: S.L. Stegeman

Last Revised: 9/18/2013

Page 5 of 6 

Confidential

5 

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. In the event the well can be contained, produced fluid can be plumbed into the production 

manifold within 200’ of the planned surface location. A LLOG pipeline is an abandoned 10” POGO 

Production pipeline that runs in close proximity and is presently planned to be used for the initial 

completion tie-in. 

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. 

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

MC 705 OCS-G-31521 MC 705 R1 699,973’ 10,256,748’

“*” 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 60
BLOWOUT SCENARIO

 MC 705

OCS-G-31521

Created by: S.L. Stegeman

Last Revised: 9/18/2013

Page 6 of 6 

Confidential

6 

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

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 99

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

TOTAL DAYS 129

. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 the 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 location and depth of 

the proposed well is included as Attachment H. Such cross section corresponds to each 

seismic line being submitted.

E. Shallow Hazards Report

Tesla Offshore, L.L.C conducted an archaeological deep tow survey and Berger 

Geosciences conducted high resolution geophysical survey in Mississippi Canyon Block 

705 during October 2009 & February 2010 on behalf of LLOG Exploration Offshore, 

L.L.C. A Supplemental Shallow Hazards Assessment and Benthic Communities Evaluation

for proposed Location “B” has been prepared by Berger Geosciences September, 2013, and is

 being submitted under separate cover.

F. Shallow Hazards Assessment

A shallow hazards assessment has been prepared for the proposed surface location, 

evaluating the seafloor and subsurface geologic and manmade features and conditions, 

and is included as Attachment I. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

G. High Resolution Seismic Lines

Included as Attachment J is a copy of the annotated high resolution survey data 

lines for the surface location disturbance proposed in this Plan. 

H. Stratigraphic Column 

A generalized biostratigraphic/lithostratigraphic column from the seafloor to the 

total depth of the proposed well is included as Attachment K. 

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. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

GEOLOGICAL DESCRIPTION

Attachment E 

(Proprietary Information)
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

STRUCTURE MAPS

Attachment F 

(Proprietary Information)
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

DEEP SEISMIC LINES

Attachment G 

(Proprietary Information)
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

CROSS SECTION MAPS

Attachment H 

(Proprietary Information)
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

SHALLOW HAZARDS ASSESSMENT

Attachment I 

(Public Information)
Tesla Offshore, LLC 

36499 Perkins Road 

Prairieville, Louisiana 70769 

Telephone: (225) 673-2163 

Fax: (225) 744-3116

 

August 13, 2013 Job. No. 13-153-31

Bureau of Ocean Energy Management (MS 5230) 

Gulf of Mexico OCS Region 

1201 Elmwood Park Blvd. 

New Orleans, LA 70123-2394

RE: LLOG Exploration Offshore, Inc. 

 Proposed OCS-G 31521 MC 705 Well ‘B’ Location 

Surface Location in Block 705, Mississippi Canyon Area 

Archaeological Analysis 

Dear Staff: 

LLOG Exploration Offshore, Inc. proposes to drill the OCS-G 31521 MC 705 Well ‘B’

from the following pre-approved surface location: 

2,074.12’ FNL & 3,036.66’ FWL of Block 705 Mississippi Canyon Area

LLOG Exploration Offshore, Inc. (LLOG) selected Tesla Offshore LLC to provide this 

archaeological assessment of the proposed well location based on a high-resolution 

deep-tow sonar survey covering the proposed well site in Block 705 (OCS-G 31521) with 

associated 8,000’ anchor/mooring radius into adjacent survey blocks. The geophysical 

survey was conducted by Tesla Offshore aboard the M/V Nikola and utilizing the chase 

vessel M/V Integrity for acoustic tracking. A complete archaeological assessment based 

on the data set was prepared by Tesla Offshore and submitted to LLOG (Tesla Job #09-

411-12). Complete sonar survey coverage was obtained for the entire designated 8,000 

foot radius surrounding the proposed well site. LLOG Exploration Offshore, Inc. 

operates lease OCS-G 31521 and contracted Tesla Offshore, LLC to provide this 

archaeological analysis (NTL No. 2005-G07) in accordance with the Bureau of Ocean 

Energy Management, Gulf of Mexico OCS Region. 

This archaeological assessment will be supplemented by a separate assessment of geohazards prepared under separate cover by Berger Geosciences, LLC which will address 

hazard concerns in compliance with NTL 2008-G05 and chemosynthetic potential in 

accordance with NTL 2009-G40.

Water depth is approximately 850 feet surrounding the proposed drill site. Water 

depths decrease rapidly to the southeast due to extensive faulting. 

Seafloor soils are expected to be marine deposits (MMS Visual No. 5, 1986).

Identified man-made features within the maximum anchor spread include: the 

clustered site of P&A Wells No. 1, 1, and 2, located approximately 285’ north of the 

proposed well site; the clustered site of P&A Wells, located approximately 900’ north 

of the proposed well site; and the approved Well No. 1 located approximately160’ 

NW of the proposed surface location. The LLOG 3” & 6” pipelines (Segment No. 
TESLA OFFSHORE 

LLOG Exploration Offshore, Inc. 

Proposed OCS-G 31521 MC 705 Well ‘B’ Location 

Surface Location in Block 705, Mississippi Canyon Area 

Archaeological Analysis 

Page 2 

17305 & 17304) are located approximately 165’ NW of the proposed well site as is a 

proposed 2” umbilical. The parallel LLOG pipelines (Segments 17458, 17457, and 

17505) are located north of the proposed well site, with the closest resting 

approximately 98’ to the NE. LLOG owns all of these pipelines and is aware of their 

proximity to the proposed drilling location. The individual pipelines were not 

apparent on the sonar data, suggesting that they have subsided below surficial 

sediments; therefore, it is recommended that a touch down survey be performed 

prior to drilling operations. 

Magnetic data is not required for survey in these water depths per NTL 2005-G07 

and NTL 2008-G05. 

Sonar data recorded soft layered surficial sediments of hemipelagic clays. Anchor 

divots, mooring line imprints, drilling mud, and probable debris associated with P&A 

Wells No. 1, 1, and 2 were evident on the sonar data near the proposed drilling site. 

Fault scarps and associated pockmarks and outcrops were identified throughout the 

area. LLOG will submit a separately commissioned shallow hazard and 

chemosynthetic potential assessment addressing these features in more detail. 

Sonar recorded a total of four sonar targets within the survey grid, two of which fall 

within the proposed 8,000 foot anchor radius. Sonar target no. 1 is located in Block 

661, Mississippi Canyon, approximately 6,515’ NE of the proposed well site, and 

appears as a rectangular feature measuring approximately 23’ x 20’ with no relief. 

Target No. 3 is located in Block 705, Mississippi Canyon, approximately 7,565’ east 

of the proposed well site, and is rectangular in shape, measuring approximately 19’ x 

8’ with no measurable relief. Target No. 2 is located in Block 705, Mississippi 

Canyon, approximately 8,020’ southeast of the proposed well site, and is rectangular 

in shape, measuring approximately 19’ x 8’ with no measurable relief. The targets do 

not appear to be culturally significant, and may represent modern man-made debris, 

as the sonar targets are located within a designated Fairway. The targets are 

recommended for avoidance by a distance of 250 feet, but are not considered to be 

high probability targets representative of historically significant cultural material. 

Ancillary subbottom profiler data recorded numerous fault scarps that 

corresponded with sonar and echosounder data, primarily in the southeastern portion 

of the survey grid. Sub-seafloor faulting was observed at depths ranging from the 

near-seafloor to over 100 feet BML. Several of the faults were observed with 

associated vertical gas wipeouts, or acoustic voids. Near-seafloor sediments at the 

proposed well location are fairly benign and well stratified beneath a surficial zone of 

undifferentiated acoustically amorphous deposits. 
TESLA OFFSHORE 

LLOG Exploration Offshore, Inc. 

Proposed OCS-G 31521 MC 705 Well ‘B’ Location 

Surface Location in Block 705, Mississippi Canyon Area 

Archaeological Analysis 

Page 3 

The combined deep tow sonar (120 kHz), echosounder, and ancillary subbottom profiler 

records verified that the seafloor is clear of potential shipwrecks within the proposed 

anchor radius surrounding the proposed Well ‘B’ location in Block 705, Mississippi 

Canyon Area. The sonar data did not reveal any objects that are believed to be 

potentially significant cultural resources. Pursuant to 30 CFR 550.194 (c), 30 CFR 

550.101 (c), and NTL 2005-G07, if any archaeological or potentially historically 

significant materials are observed during lease development, operations will immediately 

cease in that area and appropriate BOEM personnel will be notified within 48 hours of 

discovery. 

 

LLOG Exploration Offshore, Inc. and subcontractors will apply the safest and best 

available technologies during drilling operations. 

Yours truly, 

 

Matt Keith Erin Voisin, MA 

Geoscience Manager Marine Archaeologist
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

STRATIGRAPHIC COLUMN

Attachment J

(Proprietary Information)
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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© and NTL No. 2009-G31 “Hydrogen 

Sulfide”, BOEM classified this area as “H2S Absent” in the approval letter dated 

November 2, 2011 for the Initial Exploration Plan (N-9504). 

C. H2S Contingency Plan

Not applicable for the proposed operations. 

D. Modeling Report

Not applicable to the proposed operations. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

APPENDIX E

BIOLOGICAL, PHYSICAL AND SOCIOECONOMIC 

INFORMATION

(30 CFR Part 250.216 and 250.247) 

A. High-Density Deepwater Benthic Communities Information

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

chemosynthetic communities identified within 2,000’ of the proposed surface 

location for this proposed well. 

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 705 is not located within the vicinity of a proposed live 

bottom (Pinnacle trend) area. 

E. Live Bottoms (Low Relief) Map

Mississippi Canyon Block 705 is not located within the vicinity of a proposed live 

bottom (Low Relief) area.

F. Potentially Sensitive Biological Features Map

Mississippi Canyon Block 705 is not located within the vicinity of a proposed 

sensitive biological feature area.

G. Remotely Operated Vehicle (ROV) Monitoring Survey Plan

 

Mississippi Canyon Block 705 is not located within an area where ROV Surveys 

are required.
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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

Mammal Information. 

Proposed activities in Mississippi Canyon Block 705 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

Tesla Offshore, L.L.C conducted an archaeological deep tow survey and Berger 

Geosciences conducted high resolution geophysical survey in Mississippi Canyon 

Block 705 during October 2009 & February 2010 on behalf of LLOG Exploration 

Offshore, L.L.C. 

J. Air and Water Quality Information

 Not applicable to proposed operations. 

K. Socioeconomic Information

 Not applicable to proposed operations. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

APPENDIX F

WASTE AND DISCHARGE INFORMATION

(30 CFR PART 250.217 AND 250.248)

A. Projected Generated Wastes

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

discharge to the GOM

 

LLOG does not propose any treating, storing or downhole disposal of these 

wastes at the proposed well/MODU

B. Projected Ocean Discharges

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

C. Modeling Report

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

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

MC Block 705

Type of Waste Composition Projected Amount 

T

o Discharge rate

Discharge 

Method Answer yes or no

Will drilling occur ? If yes, you should list muds and cuttings

EXAMPLE: Cuttings wetted with 

synthetic based fluid 

Cuttings generated 

while 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 18,263 bbls/well 7,309 bbls/day/well

Discharge 

overboard No

Cuttings wetted with water-based fluid

Cuttings generated 

while using water 

based drilling fluid. 1,003 bbls/well 401 bbls/day/well

Discharge 

overboard No

Cuttings wetted with synthetic-based 

fluid 

Cuttings generated 

while using synthetic 

based drilling fluid. 1,732 bbls/well 50 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

discharge 

overboard No

Domestic waste

Kitchen water and 

unprocessed water not 

used for sanitation 3,846 bbls/well 2.7 bbls/hr/well

Discharge 

overboard (no 

free oil) No

Sanitary waste

Processed sanitary 

waste from living 

quarters 2,564 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 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 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 N/A N/A N/A N/A No 

Blowout prevent fluid N/A N/A N/A N/A 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 N/A N/A N/A N/A No

Excess cement at seafloor

Excess cement slurry 

and mixwater used for 

cementing operation - 

NPDES allowed 300 bbls/well 360 bbls/hr/well

Discharge at 

mudline No

Fire water

Uncontaminated 

seawater used for fire 

control system

0 to 10,000 

bbls/well 16,350 bbls/hr/well

Discharge 

overboard No

Cooling water N/A N/A N/A N/A 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 ? 

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

General NPDES Permit #GMG290000

Projected 

Downhole 

Projected generated waste Projected ocean discharges Disposal

TABLE 1. WASTES YOU WILL GENERATE, TREAT AND DOWNHOLE DISPOSE OR DISCHARGE IN THE GOM 
please specify whether the amount reported is a total or per well

MC Block 705

Projected generated 

waste

Solid and Liquid 

Wastes transportation 

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

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

EXAMPLE: Synthetic-based drilling fluid or mud internal olefin, ester

Below deck storage tanks on offshore support vessels

Newport Environmental Services Inc., Ingleside, TX X 

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

67we

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/

EXAMPLE: trash and debris (recylables) Plastic, paper, aluminum barged in a storage bin ARC, New Iberia, LA X Trash and debris Plastic, paper, aluminum Barged in a storage bin

Blanchard Landfill, GoldenMeadows, LA 40

Used oil Spent oil from machinery

Barged in USCG approved transfer

tote tanks. L&L Services, Fourchon, LA 20

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

20we

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 

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 

Waste Dis

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

Mississippi Canyon Block 705 – OCS-G 31521

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 semi-submersible drilling unit, with related support vessels and 

construction barge information. 

As evidenced by Attachment K, the worksheets were completed based on the 

proposed flaring and burning operations. 

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 

K. 

D. Non-Exempt Activities 

The proposed activities are within the exemption amount as provided in 

Attachment K.

E. Modeling Report 

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

Mississippi Canyon Block 705 – OCS-G 31521

AIR QUALITY EMISSIONS REPORT

Attachment K 

(Public Information)
SUMMARY

FORM BOEM-0138 December 2011 - Supersedes all previous versions of form BOEM-0138 which may not be used). Page 8 of 8

COMPANY AREA BLOCK LEASE PLATFORM WELL

LLOG Exploratio Mississippi Canyon 705 OCS-G 24074 Semisubmersible Location B

Emitted Substance

Year

PM SOx NOx VOC CO

2013 7.56 34.69 259.91 7.80 56.71

2014 13.67 62.71 469.88 14.10 102.52

Allowable 1764.90 1764.90 1764.90 1764.90 47972.92
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

APPENDIX H

OIL SPILL INFORMATION

(30 CFR PART 250.219 AND 250.250)

A. Oil Spill Response Planning

The proposed activities in this Initial Exploration Plan will be covered by the Oil 

Spill Response Plan filed by LLGO (MMS Operator No. 020258) in accordance 

with 30 CFR 254 Biennial update approved on August 8, 2012 and modifications 

submitted on January 29, 2013, approved February 25, 2013, and April 11, 2013, 

approved on April 19, 2013. 

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. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

D. Worst-Case Scenario Information

Category Regional OSRP Modified EP

Type of Activity Exploratory MODU Exploratory MODU

Facility Surface Location Mississippi Canyon 

Block 547

Mississippi Canyon Block 705

Facility Description Well Location 2 Well Location B

Distance to Nearest Shoreline

(Miles) 38.4 53

Volume:

 Storage Tanks (total)

 Facility Piping (total)

 Lease Term Pipeline

 Uncontrolled Blowout (day)

 Barging

Potential 24 Hour Volume 

(bbls) 

Total Volume (Max duration 99 

day)

225,144 bbls

22,289,256 bbls

 

123,200 bbls

21,196,800 bbls

Type of Liquid Hydrocarbon Condensate Crude Oil

API Gravity 28o 43o

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 Biennial 

update approved on August 8, 2012, and modifications submitted on January 29, 

2013, approved February 25, 2013, and April 11, 2013, approved on April 19, 

2013 and since the worst case discharge determined in our Initial Exploration Plan 

for MC 705 does not exceed our worst case discharge outlined in our Regional 

OSRP, I hereby certify that LLOG Exploration Offshore, L.L.C. 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 Supplemental Exploration Plan. 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 and approved October 6, 

2011. 

 

The required proprietary data outlined in NTL 2010-N06 was submitted to BOEM 

within the under letter dated July 20, 2011, for the Initial Exploration Plan (N9504). 

E. Oil Spill Response Discussion

See the following Oil Spill Response Discussion. 
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 123,200 barrels of condensate with an API gravity of 43.9°. 

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 BOEM Oil Spill Risk Analysis Model (OSRAM) for the Central and 

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

BOEM OSRAM identifies a 4% probability of impact to the shorelines of Plaquemines Parish, 

LA within 10 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 available to 

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

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

model was run on a similar product from the ADIOS oil database. The results indicate 27% or 

approximately 33,264 barrels of condensate would be evaporated/dispersed within 24 hours, with 

approximately 89,936 barrels remaining. 

Spill Response MC 705 Barrels of Oil 

WCD Volume 123,200 

Less 27% natural evaporation/dispersion 33,264 

Remaining volume 89,936 

Oil addressed by in-situ burning 4,496 

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

storage equipment available to respond to a spill of 123,200 barrels. 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 in-situ burn. Strategies will be decided by Unified Command based on size 

of the spill, weather and potential impacts. 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 4,496 barrels of the total daily Worst Case Discharge volume could be burned. 
Slick containment boom along with sorbent boom would be immediately called out and on-scene 

as soon as possible. Offshore response strategies may include collection of condensate with 

sorbent boom (inside hard boom), attempting to skim utilizing the HOSS Barge, nine Fast 

Response Units, two Aqua Guard Triton RBS skimmers, and eleven sets of Koseq skimming 

arms, with a total derated skimming capacity of 318,609 barrels. Temporary storage associated 

with skimming equipment equals 31,700 barrels. If additional storage is needed, an 80,000 barrel 

storage barge, an 83,937 barrel storage barge, an 86,948 barrel storage barge, and a 107,285 

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 (below) 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 48 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 
Containment boom & sorbent 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 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 

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 vessel 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 

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 

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 BOEM Oil 

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

available on the BOEM website using 10 day impact. The results are tabulated below. 

Area/Block OCS-G Launch 

Area 

Land Segment and/or 

Resource 

Conditional 

Probability (%) 

within 10 days 

Exploratory Drilling 

MC 705 #1 

53 miles from shore 

G31521 C58 Terrebonne Parish, LA 

Lafourche Parish, LA 

Plaquemines Parish, LA 

1 

2 

4 
WCD Scenario– BASED ON WELL BLOWOUT DURING DRILLING OPERATIONS (53 miles from sh

123,200 bbls of condensate API Gravity 43.9° 

FIGURE 2 – Equipment Response Time to MC 705#1 

Surveillance 

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

ASI 

Aero Commander NA NA 2 Houma 1 1 0.8 

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 Koseq Skimming Arms (1) 17829 2000 1 Utility 6 Fourchon 4 12 1 Koseq Skimming Arms (5) 89145 10000 5 Utility 30 Galveston 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 DBL 101 1119760 NA 107285 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 318,609 Offshore Recovered Oil Storage 389,870 Nearshore / Shallow Water EDRC 54,753 Nearshore / Shallow Water Recovered Oil Storage 88,709 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 705 is in water depths greater than 300 meters (984 

feet); therefore, LLOG will follow the guidelines of the applicable NTL 2009-

G02 “Ocean Current Monitoring”, 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 BSEE 

NTL No. 2012-G01 “Marine Trash and Debris Awareness Training and 

Elimination” and Joint NTL No. 2012-G01 “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. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

APPENDIX J

LEASE STIPULATIONS/SPECIAL CONDITIONS INFORMATION

(30 CFR PART 250.222 AND 250.253)

A. Lease Stipulations

Minerals Management Service (BOEMRE) did not invoked any stipulations for 

Lease OCS-G 31521, Mississippi Canyon Block 705. 

B. Special Conditions

• Subsea Completions

LLOG may potentially complete the proposed well as a subsea 

completion. Therefore, LLOG will follow the regulations in Title 30 CFR 

Parts 550.296 through 550.299, which mandates the submittal and 

approval of separate regulatory filings entitled a “Conservation 

Information Document” and Title 30 CFR Parts 250.286 to Title 30 CFR 

Parts 250.295 entitled “Deepwater Operations Plan”. 

 

• Ocean Current Monitoring

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

300 meters (984’); therefore, LLOG will follow the guidelines of the 

applicable NTL 2009-G02 “Ocean Current Monitoring”, 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 705 is located within the 200 km zone of the 

Breton National Wildlife Refuge, and LLOG 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. 

• Shipping Fairways

The proposed surface disturbance in Mississippi Canyon Block 705 is 

located approximately 600’ outside the boundary of a designated shipping 

fairway as detailed on the location plat included as Attachment B.

Therefore, LLOG will comply with the U. S. Coast Guard and U. S. Army 

Corp of Engineers regarding the placement of MODU’s and associated 

anchors and chains. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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. 

D. 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 BSEE 

NTL No. 2012-G01 “Marine Trash and Debris Awareness Training and 

Elimination” and Joint NTL No. 2012-G01 “Vessel Strike Avoidance and 

Injured/Dead Protected Species Reporting”.
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

APPENDIX L

RELATED FACILITIES AND OPERATIONS INFORMATION

(30 CFR PART 250.256)

A. Produced Liquid Hydrocarbon Transportation Vessels

Not applicable to proposed operations. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 3000 bbls 1 During rig moves on/off

Supply Boats 500 bbls 1 Six times weekly

Crew Boats 500 bbls 1 Three times weekly

Aircraft 1900 lbs 1 As Needed

Anchor Handling 

Vessel

15,100 bbls 1 3-4 days

Work Boat 6,450 bbls 1 3-4 days

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 705

C. Drilling Fluids Transportation

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

Appendix F of this Plan. 

E. Solid and Liquid Wastes Transportation

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

Appendix F of this Plan. 

F. Vicinity Map

Vicinity Plats showing the location of Mississippi Canyon Block 705 relative to 

the nearest shoreline and onshore base are included as Attachment L. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

Vicinity Map

Attachment L

(Public Information)

Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

APPENDIX N

ONSHORE SUPPORT FACILITIES INFORMATION

(30 CFR PART 250.225 AND 250.258) 

 A. General

The proposed surface disturbances in Mississippi Canyon Block 705 will be 

located approximately 53 miles from the nearest Louisiana shoreline, and 

approximately 62 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 Initial 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. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 State of Louisiana 

is enclosed as Attachment M

B. Other Information

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

consistency for the proposed operations. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

 

Coastal Zone Management Consistency Statement for 

the State of Louisiana 

Attachment M

(Public Information)

 

Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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)

Other IPF’s 

you Identify

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 (4)

Water quality X X

Fisheries X X X

Marine mammals X (8) X X (8)

Sea turtles X (8) X X (8)

Air quality (9)

Shipwreck sites (known or 

potential)

X (7) X

Prehistoric archaeological sites X (7) X

Vicinity of Offshore Location

Essential fish habitat X (6)

Marine and pelagic birds X

Public health and safety (5)

Coastal and Onshore

Beaches (6)

Wetlands (6)

Shorebirds and coastal nesting 

birds

(6)

Coastal wildlife refuge

Wilderness areas
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 (Low-Relief) 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.
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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/cleanup 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 705 

is located approximately 18 miles away from the 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.
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

• 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 disturbance within Mississippi Canyon Block 705 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. In the event of an accidental oil spill from the 

proposed activities, the gravity of such oil (high gravity condensate and/or 

diesel fuel) would rise to the surface, quickly dissipate, and/or be swept 

clear by currents moving around the bank; and thus not impacting the 

pinnacles.

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 705 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 accidental oil spill from the proposed 

activities, the gravity of such oil (high gravity condensate and/or diesel 

fuel) would rise to the surface, quickly dissipate, and/or be swept clear by 

currents moving around the bank; and thus not impacting the Eastern Gulf 

live bottoms because of the depth of the features and dilutions of spills. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 in Mississippi Canyon Block 705 range from 805’ to 1,240’ 

including anchor radius. Therefore, the proposed activities are not located 

within the vicinity of any known chemosynthetic communities, which 

typically occur in water depths greater than 300 meters. Based on the 

water depth, there are no anticipated emissions, effluents, emissions 

physical disturbances to seafloor, wastes sent to shore, and/or accidents 

from the proposed activities that could impact these types of communities. 

• 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 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 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). 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 in BSEE NTL No. 2012-G01 “Marine Trash and Debris 

Awareness Training and Elimination” and Joint NTL No. 2012-G01 

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

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 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 sublethal. 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 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 BSEE NTL No. 2012-

G01 “Marine Trash and Debris Awareness Training and Elimination” and 

Joint NTL No. 2012-G01 “Vessel Strike Avoidance and Injured/Dead 

Protected Species Reporting”. 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.

• Air Quality

The proposed activities are located approximately 53 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. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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.

• 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. BOEM classified the proposed objective area as 

absent of hydrogen sulfide. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 53 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 53 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.

• 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 53 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.
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 53 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 53 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.

Other Resources Identified

LLOG has not identified any other environmental resources other than those 

addressed above.
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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

Mississippi Canyon Block 705 is not located within a geographic area impacted 

by strong environmental phenomena, other than potential hurricanes in the Gulf of 

Mexico. 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, this block 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

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. 
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 200 

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

Archerological Deep Tow Survey

Shallow Hazards Assessment, Benthic Communities

Evaluation, and Archaeological Resource Survey

Tesla

Berger Geosciences, LLC

2009

2010 

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

JOINT NTL 2012-G02 “Implementation of seismic Survey 

Mitigation Measures and Protected Species Observer 

Program”

Bureau of Ocean Energy Management, 

Regulation, and Enforcement

2012

BSEE NTL 2012-G01 “Marine Trash & Debris Awareness 

& Elimination”

Bureau of Ocean Energy Management, 

Regulation, and Enforcement

2012

JOINT NTL 2012-G01 “Vessel Strike Avoidance and 

Injured/Dead Protective Species”

Bureau of Ocean Energy Management, 

Regulation, and Enforcement

2012

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
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 2012

Regional Oil Spill Response Plan LLOG Exploration Offshore, L.L.C. 2012
Supplemental Exploration Plan

Mississippi Canyon Block 705 – OCS-G 31521

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 bottom hole 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

Archerological Deep Tow Survey

Shallow Hazards Assessment, Benthic Communities 

Evaluation, and Archaeological Resource Survey

Tesla

Berger Geosciences, LLC

2009

2010 

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. 2012