UNITED STATES GOVERNMENT MEMORANDUM

To: Public Information (MS 5030)

Plans Section, Office of Field Operations (MS 5231)

Public Information copy of Exploration Plan
Control # - N-09613

Type - Initial Exploration Plan
Lease(s) - OCS-G33967 Block - 365 Walker Ridge Area

Operator - Repsol E&P USA Inc. Drill & complete Wells A,B, & C

DP SEMISUBMERSIBLE

Attached is a copy of the subject plan for public comments on issues that should be addressed in an Environmental Assessment.

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

James Webb Plan Coordinator Description -
Rig Type - Subject: From: March 12, 2012

## PUBLIC INFORMATION December, 2011



## INITIAL EXPLORATION PLAN

Lease Number(s): OCS-G 33967 Area/Block: Walker Ridge Block 365 Prospect Name: Mollerussa

Offshore: Louisiana

Submitted by: Repsol E&P USA Inc. 2001 Timberloch Place Suite 3000 The Woodlands, Texas 77380

Wanda Slocum (281) 297-1021 wslocum@repsol.com

Estimated Start-up Date: August 1, 2012

Authorized Representative: No. Copies Being Submitted: Suzy Younger or Judy Davidson Proprietary: 1 Copy & CD J. Connor Consulting, Inc. Public Info: 1 Copy & CD 16225 Park Ten Place, Suite 700 Houston, Texas 77084 For BOEM: (281) 578-3388 Plan No. Suzy.Younger@jccteam.com Judy.Davidson@jccteam.comRecord of Changes

Date Section Page Comment 01-03-12 B Page B-3 Added statement c oncerning using a platform to drill a relief well. 01-03-12 H Page H-1 Added WCD calculation approval statement. 01-16-12 N Attachment N-2 Texas CZM Certification 01-23-12 C Attachment C-5 Re vised Stratigraphic Column 01-23-12 N Attachment N-2 Included Texas CZM evaluation.REPSOL E&P USA INC.

INITIAL EXPLORATION PLAN

LEASE OCS-G 33967

WALKER RIDGE BLOCK 365

APPENDIX A Plan Contents

APPENDIX B General Information

APPENDIX C Geological, Geophysical Information

APPENDIX D H2S Information

APPENDIX E Biological, Physical and Socioeconomic Information

APPENDIX F Wastes and Discharge Information

APPENDIX G Air Emissions Information

APPENDIX H Oil Spills Information

APPENDIX I Environmental Monitoring Information

APPENDIX J Lease Stipulations Information

APPENDIX K Environmental Mitigation Measures Information

APPENDIX L Support Vessels and Aircraft Information

APPENDIX M Onshore Support Facilities Information

APPENDIX N Coastal Zone Management Act (CZMA) Information

APPENDIX O Environmental Impact Analysis

APPENDIX P Administrative InformationLIST OF ATTACHMENTS

A-1 OCS Plan Information Form A-2 Well Location Plat A-3 Bathymetry Map A-4 Pay.Gov Receipt B-1 Nodal Analysis C-1 Structure Contour Maps C-2 3-D Seismic Lines C-3 Geological Structure Cross Sections C-4 Shallow Hazard Assessment C-5 Stratigraphic Column C-6 Time vs. Depth Table E-1 Bathymetry and Seafloor Features Map F-1 Projected Generated Wastes L-1 Solid and Liquid Waste Transportation L-2 Vicinity Map N-1 Coastal Zone Management Consistency CertificationRepsol E&P USA Inc. Page A-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX A PLAN CONTENTS

(A) PLAN INFORMATION FORM Under this Initial Explorati on Plan, Repsol E&P USA Inc. (Repsol) proposes to drill and complete three wells, Locations A, B & C. The wells will be drilled with a dynamically positioned semi-submersible MODU. Sub-sea we llheads will be installe d with the rig on location. Water depth in the bl ock ranges from 6,546’ to 6,574’.

See attached OCS Plan Information Form – Form BOEM-137, included as Attachment A-1

.

Included as Attachment A-2 is a Well Location Map depicting the proposed surface and bottom locations of the proposed well. Also included as Attachment A-3 is a Bathymetry Map showing the water depths across the lease block.

(C) SAFETY AND POLLUTION PREVENTION FEATURES There are no proposed new or existing facilitie s that will be utili zed for these operations.

A description of the drilling unit is included on the OCS Plan Information Form. Rig specifications will be made part of each Application for Permit to Drill.

Repsol will drill these wells with a dynamically positioned semi-subme rsible rig which is equipped with a Subsea BOP. Once a rig is cont racted, BOP information and schematics will be included as a part of the A pplication for Permit to Drill.

Safety features on the drilling unit will includ e well control, pollution prevention, and blowout prevention equipment as described in Title 30 CFR Part 250, Subparts C, D, E, and O; and as further clarified by BSEE Notices to Lessees , and current policy making invoked by the BOEM, Environmental Protection Agency and the U.S. Coast Guard. 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 drilling deck areas to collect all contaminants and debris.

(D) STORAGE TANKS AND/OR PRODUCTION VESSELS All facility tanks of 25 barrels or more.

Type of Storage Tank Type of Facility Tank Capacity (bbls) Number of Tanks Total Capacity

(bbls) Fluid Gravity (API) Fuel Oil (Marine Diesel) DP Semi-Submersible 9,763 7 68,338 No. 2 Diesel (36-40 API()Repsol E&P USA Inc. Page A-2 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) (E) ADDITIONAL MEASURES Repsol has visual observation of the sea, monito ring of fluid volumes and pressures to determine any leaks. Also, an ROV will monitor the wellhe ad area subsea, the surface gas detectors, current meters and visual observation of the sea su rface from the rig and from support vessels.

(F) COST RECOVERY FEE Included as Attachment A-4 is a pay.gov receipt in the amount of $10,326.00 to cover operations proposed in this plan.U.S. Department of the Interior OMB Control Number: 1010-0151 Bureau of Ocean Energy Management OMB Approval Expires: 12/31/2011* 

### OCS PLAN INFO RMATION FORM

BOEM Form BOEM-0137 ( October 2011 – Supersedes all previous editions of form BOEM-0137, which may not be used. *Collection has been submitted to OMB and is automatically renewed each month until approval) ATTACHMENT A-1 GENERAL INFORMATION Type of OCS Plan: X Exploration Plan (EP) Development Op erations Coordination Document (DOCD) Company Name: Repsol E&P USA Inc. BOEM Operator Number: 2805
Address: 2001 Timberloch Place Suite 3000 Contact Person: Suzy Younger or Judy Davidson

The Woodlands, Texas 77380 Phone Number: (281) 578-3388 Email Address: Suzy.Younger@jccteam.com or Judy.Davidson@jccteam.com Lease(s): G33967 Area: Walker Ridge Block(s) : 365 Project Name (If Applicable): Mollerussa
Objective(s): Oil Gas Sulphur Salt Onshore Base: Fourchon, LA Distan ce to Closest Land (Miles): 170.4 Description of Proposed Activities (Mark all that apply) Exploration drilling Development drilling Well completion Installation of production platform Well test flaring (for more than 48 hours) Installation of production facilities Installation of caisson or platform as well protection structure Installation of satellite structure Installation of subsea wellheads and/or manifolds Commence production Installation of lease term pipelines Other (Specify and describe) Have you submitted or do you plan to submit a Conservation Information Document to accompany this plan? Yes X No Do you propose to use new or unusual technology to conduct your activities? Yes X No Do you propose any facility that will serve as a host facility for deepwater subsea development? Yes X No Do you propose any activities that may disturb an BOEM-designated high-probability archaeological area? Yes X No Have all of the surface locations of your proposed activ ities been previously reviewed and approved by BOEM? Yes X No Tentative Schedule of Proposed Activities
Proposed Activity Start Date End Date No. of Days
Drill and Complete Well A 8/01/12 3/07/12 218 Drill and Complete Well B 3/08/13 9/19/13 195 Drill and Complete Well C 1/01/14 6/30/14 180

Description of Drilling Rig Description of Production Platform Jackup Drillship Caisson Tension leg platform Gorilla Jackup Platform rig Well protector Compliant tower Semisubmersible Submersible Fixed platform Guyed tower DP Semisubmersible Other (Attach Description) Subsea manifold Floating production system Drilling Rig Name (If Known): Spar Other (Attach description) Description of Lease Term Pipelines From (Facility/Area/Block) To (Facility/Area /Block) Diameter (inches) Length (Feet)OCS PLAN INFORMATION FORM (CONTINUED) Include one copy of this page for each proposed well/structure



### BOEM Form BOEM-0137 ( October 2011 – Supersedes all previous editions of form BOEM-0137, which may not be used .) Proposed Well/Structure Location

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

Anchor Radius (if applicable) in feet: NA Yes No

Surface Location Bottom-Hole Location (For Wells)

Lease No. OCS G33967

Area Name Walker Ridge

Block No. 365

Blockline Departures (in feet) N/S Departure: 4456’ FNL

E/W Departure: 1913’ FEL

Lambert X-Y coordinates X: 2,199,847

Y: 9,657,944

Latitude/ Longitude Latitude: 26° 36’ 20.75”

Longitude: 91° 17’ 14.94”

TVD (Feet): MD (Feet): Water Depth (Feet): 6,574’ Anchor Locations for Drilling Rig or Construction Barg e (If anchor radius supp lied 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 BOEM collects this information as part of an applicant’s Exploration Plan or Development Operations Coordination Docum ent submitted for BOEM approval. We use the info rmation to facilitate our review and data entry for OCS plans. We will protect prop rietary data according to the Freedom of Informati on Act and 30 CFR 550.197. An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it disp lays a currently valid Office of Management and Budget Contro l Number. The use of this form is voluntary. The public reporting burden for this form is included in the burden for preparing Ex ploration 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 ma intaining data, and completing and reviewing the forms associated with subpart B. D irect comments regarding the burd en estimate or any other aspect of this form to the Information Collecti on Clearance Officer, Bureau of Ocean Energy Manageme nt, 381 Elden Street, Herndon, VA 20170.OCS PLAN INFORMATION FORM (CONTINUED) Include one copy of this page for each proposed well/structure



### BOEM Form BOEM-0137 ( October 2011 – Supersedes all previous editions of form BOEM-0137, which may not be used .) Proposed Well/Structure Location

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

Anchor Radius (if applicable) in feet: NA Yes No

Surface Location Bottom-Hole Location (For Wells)

Lease No. OCS G33967

Area Name Walker Ridge

Block No. 365

Blockline Departures (in feet) N/S Departure: 2056’ FNL

E/W Departure: 3269’ FEL

Lambert X-Y coordinates X: 2,198,841

Y: 9,660,344

Latitude/ Longitude Latitude: 26° 36’ 44.69”

Longitude: 91° 17’ 29.52”

TVD (Feet): MD (Feet): Water Depth (Feet): 6,546’ Anchor Locations for Drilling Rig or Construction Barg e (If anchor radius supp lied 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 BOEM collects this information as part of an applicant’s Exploration Plan or Development Operations Coordination Docum ent submitted for BOEM approval. We use the info rmation to facilitate our review and data entry for OCS plans. We will protect prop rietary data according to the Freedom of Informati on Act and 30 CFR 550.197. An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it disp lays a currently valid Office of Management and Budget Contro l Number. The use of this form is voluntary. The public reporting burden for this form is included in the burden for preparing Ex ploration 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 ma intaining data, and completing and reviewing the forms associated with subpart B. D irect comments regarding the burd en estimate or any other aspect of this form to the Information Collecti on Clearance Officer, Bureau of Ocean Energy Manageme nt, 381 Elden Street, Herndon, VA 20170.OCS PLAN INFORMATION FORM (CONTINUED) Include one copy of this page for each proposed well/structure



### BOEM Form BOEM-0137 ( October 2011 – Supersedes all previous editions of form BOEM-0137, which may not be used .) Proposed Well/Structure Location

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

Anchor Radius (if applicable) in feet: NA Yes No

Surface Location Bottom-Hole Location (For Wells)

Lease No. OCS G33967

Area Name Walker Ridge

Block No. 365

Blockline Departures (in feet) N/S Departure: 5607’ FNL

E/W Departure: 1401’ FEL

Lambert X-Y coordinates X: 2,200,359

Y: 9,656,793

Latitude/ Longitude Latitude: 26° 36’ 09.28”

Longitude: 91° 17’ 09.46”

TVD (Feet): MD (Feet): Water Depth (Feet): 6,553’ Anchor Locations for Drilling Rig or Construction Barg e (If anchor radius supp lied 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 BOEM collects this information as part of an applicant’s Exploration Plan or Development Operations Coordination Docum ent submitted for BOEM approval. We use the info rmation to facilitate our review and data entry for OCS plans. We will protect prop rietary data according to the Freedom of Informati on Act and 30 CFR 550.197. An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it disp lays a currently valid Office of Management and Budget Contro l Number. The use of this form is voluntary. The public reporting burden for this form is included in the burden for preparing Ex ploration 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 ma intaining data, and completing and reviewing the forms associated with subpart B. D irect comments regarding the burd en estimate or any other aspect of this form to the Information Collecti on Clearance Officer, Bureau of Ocean Energy Manageme nt, 381 Elden Street, Herndon, VA 20170.Location Call N/S Call E/W X Coordinate Y Coordinate Latitude Longitude WD

WR 365 A Surface 4,456' FNL 1,913' FEL 2,199,847 9,657,944 26° 36' 20.75"N 91° 17' 14.94" W

‐ 6,574

WR 365 B Surface 2,056' FNL 3,269' FEL 2,198,491 9,660,344 26° 36' 44.69"N 91° 17' 29.52"W

‐ 6,546

WR 365 C Surface 5,607' FNL 1,401' FEL 2,200,359 9,656,793 26° 36' 09.28"N 91° 17' 09.46"W

‐ 6,553®33 3
3 ®33 3
3

®33 3
3

Proposed WR365-C Well Location Proposed WR365-B Well Location

Proposed WR365-A Well Location -6600 -6650

-6700 -6750 -6 800

-6850 -6550

-6900

-69 50 -7000 -7050

-7100 -7150

-720
0 -7250

-7300

-7350 -6500

-6450

- 7400 -6400

-7450 -7500 -7550 -6350

-760091°17'0"W91°17'30"W

26°36'30"N

26°36'0"N2,198,0002,200,0002,202,000 9,656,000 9,658,000 9,660,000

Seabed Depth (Feet) 0 1,000 500 Feet

0 250 500 125 Meters Chart Scale 1" = 1,000' 

## Seabed Depth Extract

Proposed WR365-A Well Location (2,199,847ft E / 9,657,944ft N) ®33 3
3 Depth in feet below sea surface to seabed, contoured at 50ft intervals



### Figure 1 (WR365-A) 

# ±

-6600 2 0 0 0 f t R

a d i u s

Block boundaries Proposed WR365-B Well Location (2,198,491ft E / 9,660,344ft N) ®33 3
3
Proposed WR365-C Well Location (2,200,359ft E / 9,656,793ft N) ®33 3
3Repsol E&P USA Inc. Page B-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX B GENERAL INFORMATION

(A) APPLICATIONS AND PERMITS Listed in the table below are additional permits/a pplications to be filed before operations can commence under this EP:

Application/Permit Issuing Agency Status Applications for Permit to Drill BOEM To be submitted

(B) DRILLING FLUIDS Type of Drilling Fluid Estimated Volume of Drilling Fluid to be Used per Well Water-based 50,000 bbls Oil-based (diesel, minerals, oil) 0 bbls Synthetic-based 10,000 bbls

(C) NEW OR UNUSUAL TECHNOLOGY Repsol does not propose to use any new or unusual technology to ca rry out the proposed exploration activities.

(D) BONDING STATEMENT The bond requirements for the activities and facili ties proposed in this EP are satisfied by $1,000,000 areawide development bond, furnished and maintained according to 30 CFR 556, subpart I; NTL No. 2000-G16, "Guidelines for General Lease Surety Bonds".

(E) OIL SPILL FINANCIAL RESPONSIBILITY (OSFR) Repsol E&P USA Inc., BOEM company number 2805 has demonstrated or will demonstrate oil spill financial responsibility for the facilities pro posed in this EP according to 30 CFR Part 553; and NTL No. 2008-N05, "Guidelines for Oil Sp ill Financial Responsibility for Covered Facilities".

(F) DEEPWATER WELL CONTROL STATEMENT Repsol E&P USA Inc., BOEM company number 2805 has or will have the financial capability to drill a relief well and conduct othe r emergency well control operations.

(G) BLOWOUT SCENARIO Estimated Flow Rate The calculated WCD volume for the Walker Ridge Block 365 Well A is 51,929 STB oil/day for Wilcox open hole sections.Repsol E&P USA Inc. Page B-2 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Maximum Duration of Potential Blowout and Total Volume For the purpose of WCD response a nd containment, we assume that the rate will be constant for the period that will be required to drill a relief well (up to 180 days). The expected discharge volumes over time resulting from these assumptions are shown in Table 1 below.

Table 1. Expected discharge volumes

Discussion of Potential fo r well to Bridge Over During the unlikely scenario of the well blowout, the well may potentially bridge over due to the open hole and the huge drawdown e xperienced by the well. The bri dge over will certainly reduce well discharge rate and may even kill the well and stop hydrocarbon flow completely. However, we assume that the well is not bridged over fo r our worst case discharge calculation following the guideline from NTL-06.

Relief Well At the expected time of drilling Walker Ridge Block 365 Well A in the third quarter of 2012, there are plans for several rigs by other operators in the Gulf of Mexico which will be capable of drilling a relief well designed to intersect the or iginal wellbore at a de pth near the expected influx and killing the well by pumping kill weight fluid. Suitab le rigs (WD> 7,000’ , drilling rate > 30,000’ hoisting 2.0 MM# or over) to perform a relief well operation include Transocean’s the dynamically positioned semi-submersibles Deepwate r Driller, Deepwater Driller II, Deepwater Driller III, and the Ensco 8500, Ensco 8501, and Ensc o 8502 in addition to drillships Transocean Clear Leader, Inspiration, and De ep Seas. Mutual aid agreements among operators for rigs with equipment for emergency relief well use are cu rrently proceeding and will be in place when Walker Ridge Well A will be drilled.

The expected time to temporarily abandon another well at its cu rrent location, pull riser, and move a relief well rig to Walker Ridge Block 365 location is about 10 days. When the rig is on location, the well is expected to take 180 days or less to reach a dept h suitable to begin kill operations.

Measures to Enhance Ability to Prevent and Reduce the Likelihood of a Blowout Early kick detection methods such as flow checks, connection flow signature monitoring, circulating out drilling breaks, and circulating ou t completely before the connection. In addition, blowout likelihood is reduced by cr ew training on well behavior in SBM, crew awareness to “stop work” if parameters become out of the ordinary, and close supervision.

Measures to Enhance Ability to Conduct Effective and Early Inte rvention in the Event of a Blowout Daily rate 51,929 STB oil/day Fifty day cumulative 1.94 MMSTB oil One Hundred day cumulative 3.77 MMSTB oil One Hundred eighty day cumulative 6.57 MMSTB oilRepsol E&P USA Inc. Page B-3 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Repsol has evaluated blowout scenarios, procedures, equipm ent and personnel response, and following relief well response. Repsol is an ac tive member of the Helix Well Containment Group which provides early intervention eq uipment and technical expertise.

The possibility of using a nearby platform to drill a relief well was not considered.

Included as Attachment B-1 is are worst-cast discharge calculations and analyses. (Proprietary)Repsol E&P USA Inc. Page C-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX C GEOLOGICAL AND GEOPHYSICAL INFORMATION

(A) GEOLOGICAL DESCRIPTION The Mollerussa prospect is a subsalt 3-way comb ined closure against salt and fault, comprising Lower Eocene and Paleocene ages reservoirs of th e Wilcox Formation. The prospect covers part of five (3x3 mile) OCS blocks in the Walker Ridge protracti on area, Walker Ridge Blocks 321, 322, 365, 366 and 409. The structure is intended to be tested by a deviate well from a surface location in Walker Ridge Block 365. The Jack Field (Walker Ridge Block 759) is considered to be the closest field analog.

(B) STRUCTURE CONTOUR MAP(S) Current structure contour maps drawn on the to p of each prospective hydrocarbon sand, showing the entire lease block, the locatio n of each proposed well, and the locations of geological crosssections are included as Attachment C-1.

(C) INTERPRETED 2-D And/Or 3-D SEISMIC LINE(S) Interpreted or 3-D seismic lines are included as Attachment C-2. These lines are migrated, annotated with depth scale, and are within 500 ’ of the surface locations of the proposed wells.

(D) GEOLOGICAL STRUCTURE CROSS-SECTIONS Interpreted geological structure cross-sections showing the locat ion and depth of each proposed well and at least one key horizon and the objective sands labeled using sta ndard biostratigrahic terms are included as Attachment C-3.

(E) SHALLOW HAZARDS REPORT A shallow hazards survey was conducted by Gardline Surveys, Inc. in May, 2011 over Walker Ridge Blocks 321, 322, 365, 366, 409 and 410. One ha rd copy and one CD of the report are being submitted to the BOEM under separate cover.

(F) SHALLOW HAZARDS ASSESSMENT Utilizing the 3D seismic exploration data, a sh allow hazards assessment was prepared for the proposed surface locations, and is included as Attachment C-4.

(G) HIGH-RESOLUTION SEISMIC LINES Attached to one Proprietary Copy of this Plan, Attachment C-2, is 3-D survey information including swath bathymetry/seafloor rendering/edge detection (fault scarp trends) overlain with the seafloor amplitude.

(H) STRATIGRAPHIC COLUMN A generalized biostratigraphic/lit hostratigraphic column depicting each well from the seafloor to total depth, with each objective horizon labeled, is included as Attachment C-5.Repsol E&P USA Inc. Page C-2 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) (I) TIME VS DEPTH TABLES Tables providing seismic travel time versus depth for the proposed well locations in areas where there is no well control is included as Attachment C-6.

## REPSOL E & P USA INC

3D GEOHAZARD ASSESSMENT

WALKER RIDGE BLOCK 365

MOLLERUSSA PROSPECT
PROPOSED WR365-A, B AND C WELL LOCATIONS

WELL CLEARANCE LETTERS

DECEMBER 2010

Gardline Project Ref. 8600 Report Status Final Issue Date May 16, 2011

Gardline Surveys Inc 1500 Bingle Road, Houston, Texas 77055, USA Telephone 713 481 4630 Fax 713 464 8275 www.gardline.comRepsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations


### APPENDIX A – Public Shallow Hazards StatementsRepsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations

Public Shallow Hazards Statement – WR365-A

May 16, 2011

US Department of the Interior Bureau of Ocean Energy Management, Regulation and Enforcement 1201 Elmwood Park Blvd. New Orleans, LA 70213-2394

Attention:

Reference: Shallow Hazards Analysis Walker Ridge Block 365 OCS-(G 33967)

Ladies/Gentlemen:

Repsol E & P USA Inc contracted Gardline Surveys, Inc. to prepare a Well Clearance Letter for the proposed WR365-A well location in Block 365, Walker Ridge (OCS-G 33967). This letter addresses seafloor and shallow geologic conditions that may impact exploratory drilling operations within 2,000ft of the proposed well location. The depth limit of this geohazard assessment is to Top of Salt at - 6,882ft below sea surface (308ft below seabed).

This hazards summary letter is issued as a supplement to Gardline Report No. 8600 entitled: 3D Geohazard Assessment, Gulf of Mexico, Walker Ridge Blocks 321-322, 365-366, and 409-410, Mollerussa Prospect, dated December, 2010.

Seabed Hazards. The seabed is smooth at the proposed well.

There are no indications of seabed fluid seeps within 2,000ft of the well location.

An escarpment occurs 597ft to the southwest of the proposed well. The escarpment is the seabed expression of the boundary between the salt diapiric area and the mini-basin.

No existing seabed infrastructure is located in the area.

Sub-Seabed Hazards. No gas hazards are interpreted.Repsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations
Proposed WR365-A Location (Surface)
Location Coordinates NAD 27 Datum - Clarke 1866 Ellipsoid UTM Zone 15 - CM 90° West
Latitude 26° 36' 20.75” North Easting 2,199,847 US ft E Longitude 91° 17’ 14.94” West Northing 9,657,944 US ft N FEL of Walker Ridge 365 1,913ft US ft Inline 23380 FNL of Walker Ridge 365 4,456ft US ft Crossline 5506 Water Depth: -6,574ft Slope: 3.2° south
Nearest Shoreline 171 Miles @ 8° 49’ 44.44” Port of Operation Fourchon 186 Miles @ 20° 19’ 58.81
Nearest Manned Platform A-Constitution in GC680 50.72 Miles @ 20° 26’ 12.03’’

Conclusions and Recommendations. No significant drilling problems or hazards are predicted.

Sincerely, Repsol E & P USA, Inc.

David Ramos



## PUBLIC INFORMATIONRepsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations

Public Shallow Hazards Statement – WR365-B

May 16, 2011

US Department of the Interior Bureau of Ocean Energy Management, Regulation and Enforcement 1201 Elmwood Park Blvd. New Orleans, LA 70213-2394

Attention:

Reference: Shallow Hazards Analysis Walker Ridge Block 365 OCS-(G 33967)

Ladies/Gentlemen:

Repsol E & P USA Inc contracted Gardline Surveys, Inc. to prepare a Well Clearance Letter for the proposed WR365-B well location in Block 365, Walker Ridge (OCS-G 33967). This letter addresses seafloor and shallow geologic conditions that may impact exploratory drilling operations within 2,000ft of the proposed well location. The depth limit of this geohazard assessment is to Top of Salt at - 6,833ft below sea surface (287ft below seabed).

This hazards summary letter is issued as a supplement to Gardline Report No. 8600 entitled: 3D Geohazard Assessment, Gulf of Mexico, Walker Ridge Blocks 321-322, 365-366, and 409-410, Mollerussa Prospect, dated December, 2010.

Seabed Hazards. The seabed is smooth at the proposed well.

There are no indications of seabed fluid seeps within 2,000ft of the well location.

An escarpment occurs 1,193ft to the southwest of the proposed well. The escarpment is the seabed expression of the boundary between the salt diapiric area and the mini-basin.

No existing seabed infrastructure is located in the area.

Sub-Seabed Hazards. No gas hazards are interpreted.Repsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations
Proposed WR365-B Location (Surface)

Location Coordinates NAD 27 Datum - Clarke 1866 Ellipsoid UTM Zone 15 - CM 90° West
Latitude 26° 36' 44.69” North Easting 2,198,491 US ft E Longitude 91° 17’ 29.52” West Northing 9,660,344 US ft N FEL of Walker Ridge 365 3,269ft US ft Inline 23565 FNL of Walker Ridge 365 2,056ft US ft Crossline 5473 Water Depth: -6,546ft Slope: 2.2° WSW
Nearest Shoreline 171 Miles @ 8° 49’ 44.44” Port of Operation Fourchon 186 Miles @ 20° 19’ 58.81
Nearest Manned Platform A-Constitution in GC680 50.39 Miles @ 20° 53’ 33.59’’

Conclusions and Recommendations. No significant drilling problems or hazards are predicted.

Sincerely, Repsol E & P USA, Inc.

David Ramos



## PUBLIC INFORMATIONRepsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations

Public Shallow Hazards Statement – WR365-C

May 16, 2011

US Department of the Interior Bureau of Ocean Energy Management, Regulation and Enforcement 1201 Elmwood Park Blvd. New Orleans, LA 70213-2394

Attention:

Reference: Shallow Hazards Analysis Walker Ridge Block 365 OCS-(G 33967)

Ladies/Gentlemen:

Repsol E & P USA Inc contracted Gardline Surveys, Inc. to prepare a Well Clearance Letter for the proposed WR365-C well location in Block 365, Walker Ridge (OCS-G 33967). This letter addresses seafloor and shallow geologic conditions that may impact exploratory drilling operations within 2,000ft of the proposed well location. The depth limit of this geohazard assessment is to Top of Salt at - 7,139ft below sea surface (586ft below seabed).

This hazards summary letter is issued as a supplement to Gardline Report No. 8600 entitled: 3D Geohazard Assessment, Gulf of Mexico, Walker Ridge Blocks 321-322, 365-366, and 409-410, Mollerussa Prospect, dated December, 2010.

Seabed Hazards. The seabed is smooth at the proposed well.

There are no indications of seabed fluid seeps within 2,000ft of the well location.

An escarpment occurs 460ft to the southeast of the proposed well. The escarpment is the seabed expression of the boundary between the salt diapiric area and the mini-basin.

No existing seabed infrastructure is located in the area.

Sub-Seabed Hazards. No gas hazards are interpreted.Repsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations
Proposed WR365-C Location (Surface)

Location Coordinates NAD 27 Datum - Clarke 1866 Ellipsoid UTM Zone 15 - CM 90° West
Latitude 26° 36' 09.28” North Easting 2,200,359 US ft E Longitude 91° 17’ 09.46” West Northing 9,656,793 US ft N FEL of Walker Ridge 365 1,401ft US ft Inline 23295 FNL of Walker Ridge 365 5,607ft US ft Crossline 5519 Water Depth: -6,554ft Slope: 4.7° northwest
Nearest Shoreline 171 Miles @ 8° 49’ 44.44” Port of Operation Fourchon 186 Miles @ 20° 19’ 58.81
Nearest Manned Platform A-Constitution in GC680 50.89 Miles @ 20° 14’ 43.16’’

Conclusions and Recommendations. No significant drilling problems or hazards are predicted.

Sincerely, Repsol E & P USA, Inc.

David Ramos



## PUBLIC INFORMATIONRepsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations 

### APPENDIX B – Sensitive Sessile Benthic Community StatementsRepsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations Sensitive Sessile Benthic Community Statement – WR635-A



### Repsol E & P USA Inc

May 16, 2011

US Department of the Interior Bureau of Ocean Energy Management, Regulation and Enforcement 1201 Elmwood Park Blvd. New Orleans, LA 70213

Reference: Sensitive Sessile Benthic Community Summary Walker Ridge, Block 365 OCS-(G 33967)

Ladies/Gentlemen:

Gardline Surveys Inc was contracted by Repsol E & P USA Inc to prepare a Site Clearance Letter for the proposed WR365-A well location in Walker Ridge Block 365 (OCS-G 33967). This letter addresses location proximity to potential sensitive sessile benthic community sites. Repsol E & P USA Inc will be drilling this well from a dynamically positi oned drilling module; therefore, no anchors will impact seabed.

This sensitive sessile benthic community summary letter is issued as a supplement to Gardline Report No. 8600 entitled: 3D Geohazard Assessment, Gulf of Mexico, Walker Ridge Blocks 321-322, 365-366, and 409-410, Mollerussa Prospect, dated December, 2010. A Biological, Physical and Socioeconomic Map is included at the end of this appendix illustrating the areas of potential seabed impact.

Potential Sensitive Sessile Benthic Communities. Features or areas that could support high density sensitive sessile benthic communities are not located within 2,000 feet of any proposed mud and cuttings discharge location.Repsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations
Proposed WR365-A Location (Surface)
Location Coordinates NAD 27 Datum - Clarke 1866 Ellipsoid UTM Zone 15 - CM 90° West
Latitude 26° 36' 20.75” North Easting 2,199,847 US ft E Longitude 91° 17’ 14.94” West Northing 9,657,944 US ft N FEL of Walker Ridge 365 1,913ft US ft Inline 23380 FNL of Walker Ridge 365 4,456ft US ft Crossline 5506 Water Depth: -6,574ft Slope: 3.2° south
Nearest Shoreline 171 Miles @ 8° 49’ 44.44” Port of Operation Fourchon 186 Miles @ 20° 19’ 58.81
Nearest Manned Platform A-Constitution in GC680 50.72 Miles @ 20° 26’ 12.03’’

Nearest potential sensitive sessile benthic community to the proposed location is a localized fluid expulsion site 12,010ft to the northwest.

Conclusions and Recommendations: The proposed WR365-A well location will not impact any sites favorable for development of sensitive sessile benthic communities.

Sincerely, Repsol E&P USA, Inc.

David Ramos

# ±

®33 3
3 ®33 3
3

®33 3
3
-7050

-7000 -6950

-6900

-6850 -6800

-6750 -6700 -6650 -6600 -6550

-7100 -7150 -7200 -7250 -7300 -7350 -7400 -7450 -7500 -7550 -7600

-7650

-7700 -6500 -6450

-7750 -7800

-7850 -6400

-6350

-6300 -6600

-6400 -6550

-6450 -6750 -6550 -6650

-6400

-6500 -6500 -6700

-6300 Proposed WR365-B Well Location

Proposed WR365-A Well Location

Proposed WR365-C Well Location91°16'0"W91°17'0"W91°18'0"W

26°37'0"N

26°36'0"N2,195,0002,200,0002,205,000 9,655,000 9,660,000 9,665,000

0 1,000 2,000 500 Feet

0 250 500 125 Meters Chart scale 1" = 2,000' 

## Biological, Physical & Socio-Economic Plat Proposed WR365-A Well Location (2,199,847ft E / 9,657,944ft N) ®33 3
3

Proposed WR365-B Well Location (2,198,491ft E / 9,660,344ft N) ®33 3
3 Depth in feet below s ea surface to seabed, contoured at 50ft intervals -6500 2 0 0 0

f t R a

d

i u s 2 0 0

0

f t R a

d

i u s



## BLOCK WR365 (OCS-G33967)

Proposed WR365-C Well Location (2,200,359ft E / 9,656,793ft N) ®33 3
3

Block boundary Seabed fault intersection, tick denotes downthrown block 2

0

0

0

f t R

a d i u sRepsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations Sensitive Sessile Benthic Community Statement – WR635-B



### Repsol E & P USA Inc

May 16, 2011

US Department of the Interior Bureau of Ocean Energy Management, Regulation and Enforcement 1201 Elmwood Park Blvd. New Orleans, LA 70213

Reference: Sensitive Sessile Benthic Community Summary Walker Ridge, Block 365 OCS-(G 33967)

Ladies/Gentlemen:

Gardline Surveys Inc was contracted by Repsol E & P USA Inc to prepare a Site Clearance Letter for the proposed WR365-B well location in Walker Ridge Block 365 (OCS-G 33967). This letter addresses location proximity to potential sensitive sessile benthic community sites. Repsol E & P USA Inc will be drilling this well from a dynamically positi oned drilling module; therefore, no anchors will impact seabed.

This sensitive sessile benthic community summary letter is issued as a supplement to Gardline Report No. 8600 entitled: 3D Geohazard Assessment, Gulf of Mexico, Walker Ridge Blocks 321-322, 365-366, and 409-410, Mollerussa Prospect, dated December, 2010. A Biological, Physical and Socioeconomic Map is included at the end of this appendix illustrating the areas of potential seabed impact.

Potential Sensitive Sessile Benthic Communities. Features or areas that could support high density sensitive sessile benthic communities are not located within 2,000 feet of any proposed mud and cuttings discharge location.Repsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations
Proposed WR365-B Location (Surface)

Location Coordinates NAD 27 Datum - Clarke 1866 Ellipsoid UTM Zone 15 - CM 90° West
Latitude 26° 36' 44.69” North Easting 2,198,491 US ft E Longitude 91° 17’ 29.52” West Northing 9,660,344 US ft N FEL of Walker Ridge 365 3,269ft US ft Inline 23565 FNL of Walker Ridge 365 2,056ft US ft Crossline 5473 Water Depth: -6,546ft Slope: 2.2° WSW
Nearest Shoreline 171 Miles @ 8° 49’ 44.44” Port of Operation Fourchon 186 Miles @ 20° 19’ 58.81
Nearest Manned Platform A-Constitution in GC680 50.39 Miles @ 20° 53’ 33.59’’

Nearest potential sensitive sessile benthic community to the proposed location is a localized fluid expulsion site 9,473ft to the northwest.

Conclusions and Recommendations: The proposed WR365-B well location will not impact any sites favorable for development of sensitive sessile benthic communities.

Sincerely, Repsol E&P USA, Inc.

David Ramos

# ±

®33 3
3 ®33 3
3

®33 3
3
-7050

-7000 -6950

-6900

-6850 -6800

-6750 -6700 -6650 -6600 -6550

-7100 -7150 -7200 -7250 -7300 -7350 -7400 -7450 -7500 -7550 -7600

-7650

-7700 -6500 -6450

-7750 -7800

-7850 -6400

-6350

-6300 -6600

-6400 -6550

-6450 -6750 -6550 -6650

-6400

-6500 -6500 -6700

-6300 Proposed WR365-B Well Location

Proposed WR365-A Well Location

Proposed WR365-C Well Location91°16'0"W91°17'0"W91°18'0"W

26°37'0"N

26°36'0"N2,195,0002,200,0002,205,000 9,655,000 9,660,000 9,665,000

0 1,000 2,000 500 Feet

0 250 500 125 Meters Chart scale 1" = 2,000' 

## Biological, Physical & Socio-Economic Plat Proposed WR365-A Well Location (2,199,847ft E / 9,657,944ft N) ®33 3
3

Proposed WR365-B Well Location (2,198,491ft E / 9,660,344ft N) ®33 3
3 Depth in feet below s ea surface to seabed, contoured at 50ft intervals -6500 2 0 0 0

f t R a

d

i u s 2 0 0

0

f t R a

d

i u s



## BLOCK WR365 (OCS-G33967)

Proposed WR365-C Well Location (2,200,359ft E / 9,656,793ft N) ®33 3
3

Block boundary Seabed fault intersection, tick denotes downthrown block 2

0

0

0

f t R

a d i u sRepsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations Sensitive Sessile Benthic Community Statement – WR635-C



### Repsol E & P USA Inc

May 16, 2011

US Department of the Interior Bureau of Ocean Energy Management, Regulation and Enforcement 1201 Elmwood Park Blvd. New Orleans, LA 70213

Reference: Sensitive Sessile Benthic Community Summary Walker Ridge, Block 365 OCS-(G 33967)

Ladies/Gentlemen:

Gardline Surveys Inc was contracted by Repsol E & P USA Inc to prepare a Site Clearance Letter for the proposed WR365-C well location in Walker Ridge Block 365 (OCS-G 33967). This letter addresses location proximity to potential sensitive sessile benthic community sites. Repsol E & P USA Inc will be drilling this well from a dynamically positi oned drilling module; therefore, no anchors will impact seabed.

This sensitive sessile benthic community summary letter is issued as a supplement to Gardline Report No. 8600 entitled: 3D Geohazard Assessment, Gulf of Mexico, Walker Ridge Blocks 321-322, 365-366, and 409-410, Mollerussa Prospect, dated December, 2010. A Biological, Physical and Socioeconomic Map is included at the end of this appendix illustrating the areas of potential seabed impact.

Potential Sensitive Sessile Benthic Communities. Features or areas that could support high density sensitive sessile benthic communities are not located within 2,000 feet of any proposed mud and cuttings discharge location.Repsol E & P USA Inc Gardline Report 8600 Well Clearance Letters – Walker Ridge Block 365 – Proposed WR365-A, B & C Well Locations
Proposed WR365-C Location (Surface)

Location Coordinates NAD 27 Datum - Clarke 1866 Ellipsoid UTM Zone 15 - CM 90° West
Latitude 26° 36' 09.28” North Easting 2,200,359 US ft E Longitude 91° 17’ 09.46” West Northing 9,656,793 US ft N FEL of Walker Ridge 365 1,401ft US ft Inline 23295 FNL of Walker Ridge 365 5,607ft US ft Crossline 5519 Water Depth: -6,554ft Slope: 4.7° northwest
Nearest Shoreline 171 Miles @ 8° 49’ 44.44” Port of Operation Fourchon 186 Miles @ 20° 19’ 58.81
Nearest Manned Platform A-Constitution in GC680 50.89 Miles @ 20° 14’ 43.16’’

Nearest potential sensitive sessile benthic community to the proposed location is a localized fluid expulsion site 13,378ft to the northwest.

Conclusions and Recommendations: The proposed WR365-C well location will not impact any sites favorable for development of sensitive sessile benthic communities.

Sincerely, Repsol E&P USA, Inc.

David Ramos

# ±

®33 3
3 ®33 3
3

®33 3
3
-7050

-7000 -6950

-6900

-6850 -6800

-6750 -6700 -6650 -6600 -6550

-7100 -7150 -7200 -7250 -7300 -7350 -7400 -7450 -7500 -7550 -7600

-7650

-7700 -6500 -6450

-7750 -7800

-7850 -6400

-6350

-6300 -6600

-6400 -6550

-6450 -6750 -6550 -6650

-6400

-6500 -6500 -6700

-6300 Proposed WR365-B Well Location

Proposed WR365-A Well Location

Proposed WR365-C Well Location91°16'0"W91°17'0"W91°18'0"W

26°37'0"N

26°36'0"N2,195,0002,200,0002,205,000 9,655,000 9,660,000 9,665,000

0 1,000 2,000 500 Feet

0 250 500 125 Meters Chart scale 1" = 2,000' 

## Biological, Physical & Socio-Economic Plat Proposed WR365-A Well Location (2,199,847ft E / 9,657,944ft N) ®33 3
3

Proposed WR365-B Well Location (2,198,491ft E / 9,660,344ft N) ®33 3
3 Depth in feet below s ea surface to seabed, contoured at 50ft intervals -6500 2 0 0 0

f t R a

d

i u s 2 0 0

0

f t R a

d

i u s



## BLOCK WR365 (OCS-G33967)

Proposed WR365-C Well Location (2,200,359ft E / 9,656,793ft N) ®33 3
3

Block boundary Seabed fault intersection, tick denotes downthrown block 2

0

0

0

f t R

a d i u s®33 3
3 ®33 3
3

®33 3
3 WALKER RIDGE BLOCK 365 (OCS-G33964) WALKER RIDGE BLOCK 322 (OCS-G33965)

WALKER RIDGE BLOCK 365 (OCS-G33967) WALKER RIDGE BLOCK 366 (OCS-G33968)

WALKER RIDGE BLOCK 409 (OCS-G33377) WALKER RIDGE BLOCK 410 (NOT LEASED)5200580056005400

24800

24600

24400

24200

24000

23800

23600

23400

23200

23000

22800

22600

22400

22200

22000

21800

21600

21400 Proposed WR365-C Well Location Proposed WR365-B Well Location

Proposed WR365-A Well Location

-7750 -7700

-7650

-7800 -7600 -7550

-7500

-7450

-7400 -7350 -7300

-7250 -7200

-7150 -7100

-7050 -7000

-7850 -6950 -6900 -6550

-6800

-6750 -6650

-6700

-6850 -6600

-7900 -6500

-6450

-6400 -6350

-6300

-6250 -6200

-6150 -6100 -6050

-6800 -6850 -6300

-6550

-7900 -6250 -7400

-6700

-6300 -6550 -7550

-6300

-7200

-6350 -6450 -6350 -6550

-6550

-7000

-6400

-6400

-6950

-7900 -6100

-6550

-7900 -6150

-6300 -6900

-6350 -6400

-6800 -6600

-6400 -6500 -6300

-6600 -6250 -6600

-6250

-6300 -6400 -6700 -6350 -7500

-6900 -7300

-6650

-6300 -6650

-6700

-7900 -6650 -6800

-7150

-6400 -6550

-7050 -6350

-7750 -6100

-6550

-6400 -6550 -6500

-6950 -7350

-6700

-6500 -6350 -6500

-7900 -6250 -7100

-6400 -6550 -6450 -7250

-6650

-6400 -6100

-6200 -6350 -6500 -6100

-6500 -6350

-6250

-6700

-6900 -6350

-7850 -7050 -6200

-6250

-6250 -6250

-6700

-6350 -6550

-6550 -7450

-7900 -6350

-6700 -6600

-6300 -6950

-6550 -6650

-6500

-7900 -6450 -6750

-6850 -6350

-6950 -63502,190,0002,190,0002,195,0002,195,0002,200,0002,200,0002,205,0002,205,0002,210,0002,210,0002,215,0002,215,000

9,630,000 9,630,000 9,635,000 9,635,000 9,640,000 9,640,000 9,645,000 9,645,000 9,650,000 9,650,000 9,655,000 9,655,000 9,660,000 9,660,000 9,665,000 9,665,000 9,670,000 9,670,000 9,675,000 9,675,00091°14'0"W91°14'0"W91°15'0"W91°15'0"W91°16'0"W91°16'0"W91°17'0"W91°17'0"W91°18'0"W91°18'0"W91°19'0"W91°19'0"W91°20'0"W 26°39'0"N 26°39'0"N

26°38'0"N 26°38'0"N

26°37'0"N 26°37'0"N

26°36'0"N 26°36'0"N

26°35'0"N 26°35'0"N

26°34'0"N 26°34'0"N

26°33'0"N 26°33'0"N

26°32'0"N 26°32'0"N

3D GEOHAZARD ASSESSMENT OFFSHORE GULF OF MEXICO

WALKER RIDGE BLOCKS 321 & 322, 365 & 366, 409 & 410

MOLLERUSSA PROSPECT

BIOLOGICAL, PHYSICAL AND SOCIO-ECONOMIC

Prepared by: Gardline Surveys, Inc. 1500 Bingle Road, Houston, Texas, 77055. Telephone: 713.481.4630

REV DATE REMARKS AUTHOR DRAWN CHECKED

SURVEY DATE N/A REPORT REF 8600 REF NO

0 December 30, 2010 DRAFT JR CM ARH GEODETIC INFORMATION

Datum Parameters

Datum Name Ellipsoid Semi-major Axis Reciprocal Flattening NAD27 NAD27 6378137 Projection Method False Northing False Easting Latitude of Origin Longitude of Origin Standard Parallel Scale Factor Transverse Mercator 0 1640416.666667 0 North 9 East

0.9996 Map Projection Parameters Chart Scale 1"=1,000' 0 1,250 2,500 3,750 5,000 6,250

625 Feet

0 300 600 900 1,200 1,500 1,800

150 Meters Lund Henderson Lloyd Ridge

Walker Ridge East Breaks Green Canyon Atwater Valley Garden Banks

Keathley Canyon Alaminos Canyon

Florida Plain LEGEND

Proposed WR365-A Well Location (2,199,847ft E / 9,657,944ft N) ®33 3
3

Study Area

Not to scale Proposed WR365-B Well Location (2,198,491ft E / 9,660,344ft N)

Proposed WR365-C Well Location (2,200,359ft E / 9,656,793ft N) ®33 3
3

®33 3
3

Inline

Crossline

Block boundaries Depth in meters below sea surface to seabed, contoured at 50ft intervals -6450 2

, 0 0 0 f t R a d i u s 2

, 0 0 0 f t R a d i u s 2

, 0 0 0 f t R a d i u s 

# ±

Study area boundary Region of seabed favorable for the development of sensitive sessile benthic communities

Fault intersections at seabed. Tick denotes downthrown block.

8600.19 1 May 16, 2011 FINAL JR CM ARHRepsol E&P USA Inc. Page D-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX D HYDROGEN SULFID E INFORMATION

(A) CONCENTRATION Repsol does not anticipa te encountering any H 2 S during the proposed operations.

(B) CLASSIFICATION In accordance with Title 30 CFR 250.490(c), Repsol requests that Walker Ridge Block 365 be classified by the BOEM as H 2 S absent.

The basis for this determination is the evaluation of the following offset wells which were drilled to the stratigraphic equivalent of the Wilcox Sand Series as proposed in this EP:

Lease OCS-G 18675 Walker Ridge Block 278 Well 001 Lease OCS-G 31968 Walker Ridge Block 544 Well 001Repsol E&P USA Inc. Page E-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) APPENDIX E BIOLOGICAL, PHYSICAL AND SO CIOECONOMIC INFORMATION

(A) DEEPWATER BENTHIC COMMUNITIES Attached to this EP is a map prepared using 3-D seismic data depicting seafloor and shallow geological features and areas, and the surface locati on of the proposed wells with a radius circle of 2,000 feet around each well.

ANALYSIS Using 3-D seismic information, all seafloor feat ures and areas that co uld be disturbed by the activities proposed in this plan have been identified. The like lihood of these proposed activities disturbing these seafloor and sh allow geologic features is disc ussed in the following summary:

Well Locations A, B, & C: Features or areas that could support high-density deepwater benthic communities are not located with in 2,000 feet of any proposed muds and cuttings discharge location.

(B) TOPOGRAPHIC FEATURES MAP Activities proposed in this EP do not fall with in 305 meters (1000 feet) of a topographic “no activity zone”.

(C) TOPOGRAPHIC FEATURES STATEMENT (SHUNTING) All activities proposed under this EP will be conducted outside all Topographic Feature Protective Zones, therefore s hunting of drill cuttings and dr illing fluids is not required

(D) LIVE BOTTOMS (PINNACLE TREND) MAP Walker Ridge Block 365 is not located within 61 meters (200 feet) of an y pinnacle trend feature; therefore a separate bathym etric map is not required.

(E) LIVE BOTTOMS (LOW RELIEF) STIPULATION Walker Ridge Block 365 is not loca ted within 100 feet of any pinna cle trend feature with vertical relief equal to or greater than 8 feet; therefore, live bottom (low relief) maps are not required.

(F) POTENTIALLY SENSITIV E BIOLOGICAL FEATURES Walker Ridge Block 365 is not located within 30 meters (100 feet) of potentially sensitive biological features; therefor e, biologically sensitive area maps are not required.

(G) REMOTELY OPERATED VEHICLE (ROV) SURVEYS BOEM has determined that there is enough data gath ered in this grid area, therefore, we will not be conducting any ROV surveys either pre-spud or post-drilling operations for the purpose of biological and physic al observation.Repsol E&P USA Inc. Page E-2 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) (H)THREATENED AND ENDANG ERED SPECIES, CRITICAL HABITAT, AND MARINE MAMMAL INFORMATION Under Section 7 of the Endangered Species Act (ESA) all federal ag encies must ensure that any actions they authorize, fund, or carry out are not li kely to jeopardize the continued existence of a listed species, or destroy or adversely modify its designated critical habitat.

In accordance with 30 CFR 250, Subpart B, and further outlined in NTL 2008-G04, lessees/operators are required to address site-specific informa tion on the presence of federally listed threatened or endangered species and criti cal habitat designated under the ESA and marine mammals protected under the Ma rine Mammal Protection Act ( MMPA) in the area of proposes activities under this plan.

There are five species of sea turtles that may be found in the Gulf of Mexico (see table below). NOAA fisheries currently lists all five of these turtles as endangered (E) or threatened (T).

Species Scientific Name Status Potential Presence

Critical Habitat Designated in the Gulf of Mexico Lease Area Coastal Sea Turtles Loggerhead Turtle Carettsa Caretta T x x None Green Turtle Chelonia mydas T,E x x None Leatherback Turtle Dermochelys corlacea E x x None Hawksbill Turtle Eretmochelys imbricata E x x None Kemp’s ridley turtle Lepidochelys kempli E x x None

In addition, there are 28 species of marine mammal s that may be found in the Gulf of Mexico. The table provided below identifies the seven speci es of marine mammals that are listed as endangered or threatened. Currently, there ar e no designated critical habitats for the listed species in the Gulf of Mexico Outer Continental Shelf; however, it is pos sible that one or more of these species could be seen in the area during operations.

Species Scientific Name Status Potential Presence

Critical Habitat Designated in the Gulf of Mexico Lease Area Coastal Marine Mammals Sperm Whale Physeter macrocephalus E x -- None Florida manatee Trichechus manatus latirostris E -- x Florida (Peninsular)

Blue Whale Balaenoptera masculus E x -- None Fin whale Balaenoptera physalus E x -- None Humpback whale Megaptera novaeangliae E x -- None North Atlantic right whale Eubalaena glacialis E x -- None

Sei whale Balaenopiera borealis E x -- NoneRepsol E&P USA Inc. Page E-3 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) (I) ARCHAEOLOGICAL REPORT Walker Ridge Block 365 is not loca ted in an area determined to ha ve any historic or prehistoric cultural resources.

(J) AIR AND WATER QUALITY INFORMATION Air and water quality informati on is not required by BOEM to be included in this plan.®33 3
3 ®33 3
3

®33 3
3 WALKER RIDGE BLOCK 321 (OCS-G33964) WALKER RIDGE BLOCK 322 (OCS-G33965)

WALKER RIDGE BLOCK 365 (OCS-G33967) WALKER RIDGE BLOCK 366 (OCS-G33968)

WALKER RIDGE BLOCK 409 (OCS-G33377) WALKER RIDGE BLOCK 410 (NOT LEASED)5200580056005400

24800

24600

24400

24200

24000

23800

23600

23400

23200

23000

22800

22600

22400

22200

22000

21800

21600

21400 Proposed WR365-C Well Location Proposed WR365-B Well Location

Proposed WR365-A Well Location2,190,0002,190,0002,195,0002,195,0002,200,0002,200,0002,205,0002,205,0002,210,0002,210,0002,215,0002,215,000

9,630,000 9,630,000 9,635,000 9,635,000 9,640,000 9,640,000 9,645,000 9,645,000 9,650,000 9,650,000 9,655,000 9,655,000 9,660,000 9,660,000 9,665,000 9,665,000 9,670,000 9,670,000 9,675,000 9,675,00091°14'0"W91°14'0"W91°15'0"W91°15'0"W91°16'0"W91°16'0"W91°17'0"W91°17'0"W91°18'0"W91°18'0"W91°19'0"W91°19'0"W91°20'0"W 26°39'0"N 26°39'0"N

26°38'0"N 26°38'0"N

26°37'0"N 26°37'0"N

26°36'0"N 26°36'0"N

26°35'0"N 26°35'0"N

26°34'0"N 26°34'0"N

26°33'0"N 26°33'0"N

26°32'0"N 26°32'0"N

GEOHAZARD SUMMARY CHART 17

Prepared by: Gardline Surveys, Inc. 1500 Bingle Road, Houston, Texas, 77055. Telephone: 713.481.4630

REV DATE REMARKS AUTHOR DRAWN CHECKED

SURVEY DATE N/A REPORT REF 8600 REF NO 8600.17

0 DRAFT JR CM ARH GEODETIC INFORMATION

Datum Parameters

Datum Name Ellipsoid Semi-major Axis Reciprocal Flattening NAD27 NAD27 6378137 Projection Method False Northing False Easting Latitude of Origin Longitude of Origin Standard Parallel Scale Factor Transverse Mercator 0 1640416.666667 0 North 9 East 15 North 0.9996 Map Projection Parameters Chart Scale 1"=1,000' 0 1,250 2,500 3,750 5,000 6,250

625 Feet

0 300 600 900 1,200 1,500 1,800

150 Meters Lund Henderson Lloyd Ridge

Walker Ridge East Breaks Green Canyon Atwater Valley Garden Banks

Keathley Canyon Alaminos Canyon

Florida Plain LEGEND

Proposed WR365-A Well Location (2,199,847ft E / 9,657,944ft N) ®33 3
3

Study Area

Not to scale Proposed WR365-B Well Location (2,198,491ft E / 9,660,344ft N)

Proposed WR365-C Well Location (2,200,359ft E / 9,656,793ft N) ®33 3
3

®33 3
3

Inline

Crossline

Block boundaries 2

, 0 0 0 f t R a d i u s 2

, 0 0 0 f t R a d i u s 2

, 0 0 0 f t R a d i u s 

# ±

Region of seabed favorable for the development of sensitive sessile benthic communities

Surficial slump lobe accumulation Steeply dipping escarpment flanking salt uplift

Localized ridge on top uplift

Fault intersections at seabed. tick denotes downthrown block.

Study area boundary Unit B - Slight Risk of Gas

Unit C - Slight to locally Moderate Risk of Gas

Unit D - Slight to locally Moderate Risk of Gas

Unit E - Slight to locally Moderate Risk of Gas Unit B - Moderate Risk of Gas 3D GEOHAZARD ASSESSMENT GULF OF MEXICO WALKER RIDGE BLOCKS 321, 322, 365, 366, 409 & 410

MOLLERUSSA PROSPECT

January 21, 2011

1 May 16, 2011 FINAL JR CM ARHRepsol E&P USA Inc. Page F-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX F WASTES AND DISCHA RGES INFORMATION

(A) PROJECTED GENERATED WASTES Table 1, “ Wastes You Will Generate, Treat and Downhole Dispose or Discharge to the GOM” is included in this section as Attachment F-1

.please specify if the amount reported is a total or per well amountType of Waste Composition Projected Amount Discharge rate Discharge Method Answer yes or noWill drilling occur ? If yes, you should list muds and cuttingsWater-based drilling fluid Sea & FW Gel,Lignite Barite 60,000 bbls/well 2,000 bbls/hr Seafloor discharge prior to installation of the marine riser. NoSynthetic based drilling fluid Synthetic based drilling fluids 1,800 bbls/well4 bbls/hr (maximum whiledrilling only)1,800 bbls/well of synthetic based oil adhering to treateddried drill cuttings will be discharged overboard whiledrilling SBM interval. Cuttings are centrifudged andpassed through cuttings dryer to reduce ROC percentageto be in compliance with EPA requirements and will thenbe shunt through a downpipe to 25' below the water'ssurface. Remaining synthetic based drilling fluid isshipped to shore for recycling or disposal.NoCuttings wetted with waterbased fluidDrl Cttgs & WBM 2,700 bbls/well85 bbls/hr (maximumwhile drillingonly)Seafloor discharge prior to installation of the marine riser. NoCuttings wetted withsynthetic-based fluid Drl Cttgs & SBM 8,060 bbls/well40 bbls/hr (maximumwhile drilling only)Treated cuttings will be discharged overboard whiledrilling SBM interval. Cuttings are centrifudged andpassed through cuttings dryer to reduce ROC percentagein compliance with EPA and will then be shunt through adownpipe to 25' below the water's surface.NoWill humans be there? If yes, expect conventional wasteDomestic wasteGray water from galley,lavatory and laundry 70,000 bbls/well 75 gal/person/dayTreated by 2x100% Hamworthy Super Trident 8 BiologicalSewage Treatment Plans, IMO & MED certified andaccepted by USCG for non-US flagged vessels in USwaters. Discharged through port-side caisson (cuttingschute) below sea level. Projected amount is based onmaximum POB of 150.NoSanitary wasteTreated human body wastefrom toilets 23,500 bbls/well 25 gal/person/dayTreated by 2x100% Hamworthy Super Trident 8 BiologicalSewage Treatment Plans, IMO & MED certified andaccepted by USCG for non-US flagged vessels in USwaters. Discharged through port-side caisson (cuttingschute) below sea level. Projected amount is based onmaximum POB of 150.NoIs there a deck? If yes, there will be Deck DrainageDeck Drainage Rainwater and rig washing45,000 bbls/well (based on 65inches/year average rainfall)10 bbls/hr (dependent onrainfall)Oily water is treated in one of four separators anddischarged through port-side caisson (cuttings chute)below sea level)NoWill you conduct well treatment, completion, or workover?Well treatment fluidsNA NA NA NANoWell completion fluidsSalt solutions, weightedbrines, polymers and variousadditives10,000 bbl/well 200 bbl/hr Oily water discharge then discharge overboard; no free oil NoWorkover fluidsNA NA NA NANAMiscellaneous discharges. If yes, only fill in those associated with your activity.Desalinization unit dischargeRejected water fromwatermaker unit200,000 bbls/well 31,650 gal/dayDischarged below sea level via port or starboard caisson(salt water service discharge) Discharge rate is based onone unit running for 24 consecutive hours.NoProjectedDownholeDisposalProjected ocean dischargesProjected generated wasteATTACHMENT F-1WASTES YOU WILL GENERATE, TREAT AND DOWNHOLE DISPOSE OR DISCHARGE TO THE GOMType of Waste Composition Projected Amount Discharge rate Discharge Method Answer yes or noProjectedDownholeDisposalProjected ocean dischargesProjected generated wasteBlowout preventer fluid2% solution of Erifon HD603HPBOP control fluid in potablewater1,300 bbls/well 150 bbls/month Discharged at the seafloor.NoBallast waterUncontaminated seawaterused to maintain proper draft.925,000 bbls/well 3,500 bbls/dayPer MARPOL regulations, discharge below sea level atone of four points depending upon which quadrant of thevessel is beingballasted.NoBilge waterNA NA NA NANoExcess cement at seafloorCement slurry 500 bbls/well 20 bbls/minute Discharged at the seafloor. NAFire waterSeawater with no addition ofchemicals 36,000,000 bbls/well 137,000 bbls/dayDischarged below sea level via stern caisson (port orstarboard). Note: Fire water pumps are fed continuouslyfrom salt water service ring (cooling water). The firewater pumps will only discharge when in use.NoCooling waterSeawater with no addition ofchemicals 36,000,000 bbls/well 137,000 bbls/dayDischarged below sea level via stern caisson (port orstarboard). Discharge rate is calculated on two pumpsrunningfor 24 consecutive hours.NoWill you produce hydrocarbons? If yes fill in for produced water.Produced water NA NA NA NANAWill you be covered by an individual or general NPDES permit ?General NPDESplease specify if the amount reported is a total or per well amountType of Waste Composition Projected Amount Discharge rate Discharge Methodldrilling occur ? If yes, you should list muds and cuttingsWater-based drilling fluid Sea & FW Gel,Lignite Barite 60,000 bbls/well 2,000 bbls/hr Seafloor discharge prior to installation of the marine riser.Synthetic based drilling fluid Synthetic based drilling fluids 1,800 bbls/well4 bbls/hr (maximum whiledrilling only)1,800 bbls/well of synthetic based oil adhering to treateddried drill cuttings will be discharged overboard whiledrilling SBM interval. Cuttings are centrifudged andpassed through cuttings dryer to reduce ROC percentageto be in compliance with EPA requirements and will thenbe shunt through a downpipe to 25' below the water'ssurface. Remaining synthetic based drilling fluid isshipped to shore for recycling or disposal.Cuttings wetted with waterbased fluidDrl Cttgs & WBM 2,700 bbls/well85 bbls/hr (maximumwhile drillingonly)Seafloor discharge prior to installation of the marine riser.Cuttings wetted withsynthetic-based fluid Drl Cttgs & SBM 8,060 bbls/well40 bbls/hr (maximumwhile drilling only)Treated cuttings will be discharged overboard whiledrilling SBM interval. Cuttings are centrifudged andpassed through cuttings dryer to reduce ROC percentagein compliance with EPA and will then be shunt through adownpipe to 25' below the water's surface.lhumans be there? If yes, expect conventional wasteDomestic wasteGray water from galley,lavatory and laundry 70,000 bbls/well 75 gal/person/dayTreated by 2x100% Hamworthy Super Trident 8 BiologicalSewage Treatment Plans, IMO & MED certified andaccepted by USCG for non-US flagged vessels in USwaters. Discharged through port-side caisson (cuttingschute) below sea level. Projected amount is based onmaximum POB of 150.Sanitary wasteTreated human body wastefrom toilets 23,500 bbls/well 25 gal/person/dayTreated by 2x100% Hamworthy Super Trident 8 BiologicalSewage Treatment Plans, IMO & MED certified andaccepted by USCG for non-US flagged vessels in USwaters. Discharged through port-side caisson (cuttingschute) below sea level. Projected amount is based onmaximum POB of 150.ere a deck? If yes, there will be Deck DrainageDeck Drainage Rainwater and rig washing45,000 bbls/well (based on 65inches/year average rainfall)10 bbls/hr (dependent onrainfall)Oily water is treated in one of four separators anddischarged through port-side caisson (cuttings chute)below sea level)you conduct well treatment, completion, or workover?Well treatment fluidsNA NA NA NAWell completion fluidsSalt solutions, weightedbrines, polymers and variousadditives10,000 bbl/well 200 bbl/hr Oily water discharge then discharge overboard; no free oilWorkover fluidsNA NA NA NAcellaneous discharges. If yes, only fill in those associated with your activity.Desalinization unit dischargeRejected water fromwatermaker unit200,000 bbls/well 31,650 gal/dayDischarged below sea level via port or starboard caisson(salt water service discharge) Discharge rate is based onone unit running for 24 consecutive hours.Projected ocean dischargesProjected generated wasteATTACHMENT F-1WASTES YOU WILL GENERATE, TREAT AND DOWNHOLE DISPOSE OR DISCHARGE TO THEGType of Waste Composition Projected Amount Discharge rate Discharge MethodProjected ocean dischargesProjected generated wasteBlowout preventer fluid2% solution of Erifon HD603HPBOP control fluid in potablewater1,300 bbls/well 150 bbls/month Discharged at the seafloor.Ballast waterUncontaminated seawaterused to maintain proper draft.925,000 bbls/well 3,500 bbls/dayPer MARPOL regulations, discharge below sea level atone of four points depending upon which quadrant of thevessel is beingballasted.Bilge waterNA NA NA NAExcess cement at seafloorCement slurry 500 bbls/well 20 bbls/minute Discharged at the seafloor.Fire waterSeawater with no addition ofchemicals 36,000,000 bbls/well 137,000 bbls/dayDischarged below sea level via stern caisson (port orstarboard). Note: Fire water pumps are fed continuouslyfrom salt water service ring (cooling water). The firewater pumps will only discharge when in use.Cooling waterSeawater with no addition ofchemicals 36,000,000 bbls/well 137,000 bbls/dayDischarged below sea level via stern caisson (port orstarboard). Discharge rate is calculated on two pumpsrunningfor 24 consecutive hours.you produce hydrocarbons? If yes fill in for produced water.Produced water NA NA NA NAyou be covered by an individual or general NPDES permit ?General NPDESRepsol E&P USA Inc. Page G-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX G AIR EMISSIONS INFORMATION

(A) EMISSIONS WORKSHEETS AND SCREENING QUESTIONS

Screen Procedures for EP’s Yes No Is any calculated Complex Total (CT) Emis sion amount (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

Do your emission calculations include any emission reduction measures or modified emission factors? X Are your proposed exploration activities located east of 87.5° W longitude? X Do you expect to encounter H 2 S 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

There are no existing facilities or activities co -located with the currently proposed activities, therefore the Complex Total Emissions are the sa me as the Plan Emissi ons and are provided in the table below.

Air Pollutant Plan Emission Amounts 1 (tons) Calculated Exemption Amounts 2 (tons) Calculated Complex Total Emission Amounts 3 (tons) Carbon Monoxide (CO) 1059.51 104502.17 1059.51 Particular Matter (PM) 141.27 5674.32 141.27 Sulphur Dioxide (SO 2 ) 648.06 5674.32 648.06 Nitrogen Oxides (NO x ) 4856.07 5674.32 4856.07 Volatile Organic Compounds (VOC) 145.68 5674.32 145.68

1 For activities proposed in your EP , list the projected emissions ca lculated from the worksheets.
2 List the exemption amounts for your pr oposed activities calculat ed by using the formulas in 30 CFR 550.303(d).
3 List the complex total emissions associated with y our proposed activities calcul ated from the worksheets.

This information was calculated by: Judy Davidson (281) 578-3388 Judy.Davidson@jccteam.comRepsol E&P USA Inc. Page H-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX H OIL SPILLS INFORMATION

(A) OIL SPILL RESPONSE PLANNING All the proposed activities and facilities in the Exploration Plan will be covered by the last approved Oil Spill Response Plan (OSRP) date d May 19, 2009. The last submitted modification to that Plan was filed on January 27, 2011 and is currently pending approval. WCD calculations were approved in the Initial EP fo r Green Canyon Block 304 (Control N-9287).

(B) SPILL RESPONSE SITES

Primary Response Equipment Loca tion Preplanned Staging Location

Houma, LA Harvey, LA Houma, LA Harvey, LA Fourchon, LA

(C) OSRO INFORMATION Repsol’s primary equipment provider is Clean Gulf Associates (CGA). The Marine Spill Response Corporation’s (MSRC) STARS network will provide closest available personnel, as well as an MSRC supervisor to operate the equipment.

(D) WORST-CASE SCENARIO COMPARISON

Category Regional OSRP WCD EP WCD Type of Activity Drilling Drilling Facility Location (Area/Block) GC 304 WR 365
Facility Designation A
Distance to Nearest Shoreline (miles) 92 170.4

Volume Storage Tanks (Total) Uncontrolled blowout Total Volume 75,700 51,929

Type of Oil(s) (crude, condensate, diesel) Crude Crude

API Gravity 28° 28°

Repsol has determined that the worst-case scenario from the activ ities proposed in this EP do not supersede the worst-case scenario from our approved Regional OSRP.Repsol E&P USA Inc. Page H-2 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Since Repsol has the capability to respond to the worst-case spill scenario included in our Regional OSRP, and since the worst-case scenario determined for our EP does not replace the worst-case scenario in our Regi onal OSRP, Repsol hereby certifies that Repsol 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 our EP.

(E) SPILL RESPONSE DISCUSSION FOR NEPA ANALYSIS SPILL RESPONSE DISCUSSION For the purpose of NEPA and Coastal Zone Mana gement Act analysis, the largest spill volume originating from the proposed activity would be a well bl owout during drilling operations, estimated to be 51,929 barrels of crud e oil with an API gravity of 28°.

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 BS EE Oil Spill Risk Analysis Model (OSRAM) for the Central and Western Gulf of Mexico available on the BSEE website. The results are shown in Figure 1. The BSEE OSRAM identifies a 3% proba bility of impact to the s horelines of Cameron Parish, Louisiana within 30 days. Cameron Parish includes the east side of Sabine Lake, Sabine National Wildlife Refuge, Calcasieu Lake, Lacassine Nati onal Wildlife Refuge and Grand Lake. Cameron Parish also includes the area al ong the coastline from Sabine Pa ss to Big Constance Lake in Rockefeller Wildlife Refuge. This region is com posed of open public beaches, marshlands and swamps. It serves as a habitat for numerous bi rds, finfish and other animals, including several rare, threatened and endangered species.

Response Repsol will make every effort to respond to the Worst Case Discharge as effectively as practicable. A description of the response equipment under contra ct to contain and recover the Worst Case Discharge is shown in Figure 2.

Using the estimated chemical and physical charact eristics of crude oil, an ADIOS weathering model was run on a similar product from the ADIO S oil database. The results indicate 12% or approximately 6,231 barrels of crude oil would be evapor ated/dispersed with in 24 hours, with approximately 45,698 barrels remaining.

Spill Response WR 365, Well A Barrels of Oil
WCD Volume 51,929
Less 12% natural evaporation/dispersion 6,231 Remaining volume 45,698 Daily dispersant capability 7,540 Oil addressed by in-situ burning 2,284Repsol E&P USA Inc. Page H-3 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Figure 2 outlines equipment, personnel, materials and support vessels as well as temporary storage equipment available to respond to a spill of approximately 45,698 barrels. The volume accounts for the amount remaining after evaporatio n/dispersion at 24 hours. The list estimates individual times needed for proc urement, load out, travel time to the site and deployment. Figure 2 also indicates how operations will be supported.

Repsol’s Oil Spill Response Plan includes altern ative response technologie s such as dispersants and in-situ burn. Strategies will be decided by Unified Command based on the size of the spill, weather and potential impacts. If aerial dispersants are utili zed, 8 sorties (9,600 gallons) from two of the DC-3 aircrafts and 4 sorties (8,000 gall ons) from the Basler ai rcraft would provide a daily dispersant capability of 7,540 barrels. If th e conditions are favorable for in-situ burning, the proper approvals have been obtained and the prope r 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 2,284 barrels of the total daily Worst Ca se Discharge volume could be burned. Slick containment boom would be immediately called out and on-scene as soon as possible. Offshore response strategies may include attempting to skim utilizing the HOSS Barge, nine Fast Response Units, and two sets of Koseq skimming arms, with a total dera ted skimming capacity of 112,588 barrels. Temporary storage associ ated with skimming equipment equals 9,700 barrels. If additional storage is needed, a 25,000 barrel storage barge, three 23,000 barrel storage barges, and a 20,000 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, s horeline impact in Cameron Pa rish, Louisiana would depend upon existing environmental conditions. Shoreline prot ection would include the use of CGA’s near shore and shallow water skimmers with a tota led derated skimming cap acity of 18,253 barrels. Temporary storage associated with skimming equipment equals 1,317 barrels. If additional storage is needed, a 20,000 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 de ployment of shoreline bo om on beach areas, or protection and sorbent boom on vegetated areas. A Letter of Intent from Oil Mop will ensure access to 30,000 feet of 18” shoreline protection boom. Figure 2 outlines individual times needed for procurement, load out, travel time to the site and deployment. Strategies would be based upon surveillance and real time trajectories that depict areas of potential impact given actual sea and weather conditions. The State of Louisiana Initial Oil Spill Response Plan for Cameron 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 protect ion strategies depict the protecti on response modes applicable for oil spill clean-up operations. The State of Louisiana Initial Oil Spill Response Plan provides detailed shoreline protection strategies fo r this area, and it describes nece ssary action to ke ep the oil spill from entering Louisiana’s coastal wetlands, based on the assumption that re moval of the released oil will be much easier and less damaging to fragile coastal ecosystem s if done in the open waters of the Gulf of Mexico. Supervisory pers onnel have the option to modify the deployment and operation of equipment allowing a more eff ective response to site-specific circumstances.Repsol E&P USA Inc. Page H-4 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Repsol’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 scenar io, Repsol 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 45 hours (based on the equipment’s Effectiv e Daily Recovery Capacity (EDRC)).

Initial Response Considerations Actual actions taken during an oil spill response will be based on many factors which include but are not 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

Repsol will take action to provide a safe, aggressi ve 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 se nsitive 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 agen cies will be notified

• ICS 201, Initial Report Form will be completed

• Initial Safety plan will be written and published

• Unified Command will be established

o Overall safety plan developed to reflect the operational situa tion and coordinated objectives

o Areas of responsibility esta blished for Source Control a nd each surface operational site

o On-site command and control established

Offshore Response Actions

Equipment DeploymentRepsol E&P USA Inc. Page H-5 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Surveillance

• Surveillance Aircraft will be deployed within two hours of Qu alified Individual (QI) notification, or at first light

• Provide trained observer to pr ovide on site status reports

• Provide command and control platfo rm at the site if needed

• Continual surveillance of oil movement by re mote sensing systems, aerial photography and visual confirmation

• Continual monitoring of vessel assets using vessel monitoring systems

Dispersant application assets

• Put Airborne Support Inc. (ASI) on standby

• With the Federal On-Scene Coordinator (FOSC), conduct analysis to determine appropriateness of dispersant application

• Gain FOSC approval for use of dispersants on the surface

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

• Coordinate movement of dispersants, ai rcraft, and support equipment and personnel

• Confirm dispersant availability fo r current and long range operations

• Start ordering dispersa nt stocks required for expected operations

Containment boom

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

• Ensure boom handling and mooring equipment is deployed with boom

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

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

Dedicated off-shore skimming systems General

• Deployed to the highest concentration of oil

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

CGA HOSS Barge

• Use in areas with heaviest oil concentrations

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

CGA Fast Response Units (FRU)

• 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 capacityRepsol E&P USA Inc. Page H-6 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Storage Vessels

• Establish availability of CGA contracted assets

• Early call out (to allow for tug boa t 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 ski mming assets to minimize offloading time

Vessels of Opportunity (VOO)

• Use Repsol’s contracted resources as applicable

• Industry vessels are usually best for depl oyment 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 sa fety training to be required

• Plan with the US Coast Guard for vessel inspections

In-situ Burn assets

• Determine appropriateness of in-situ burn ope ration in coordination with the FOSC and affected State On-Scene Coordinator (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

• Place near shore assets on standby and depl oy in accordance with planning based on the actual situation, actual traj ectories and oil budgets

• VOO identification and training in advance of spill nearing sh oreline 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 shorelineRepsol E&P USA Inc. Page H-7 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Equipment Deployment Surveillance

• Provide trained observer to direct skimming operations

• Continual surveillance of oil movement by re mote sensing systems, aerial photography and visual confirmation

• Continual monitoring of vessel assets

Dispersant Use

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

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

Vessel Deployment Dedicated Near Shore skimming systems

• Fast Response Vessels (FRV)

• Egmopol and Marco Shallow Water Skimmer (SWS)

• Operate with aerial spotter directi ng systems to observed oil slicks

VOO

• Use Repsol’s contracted resources as applicable

• Industry vessels are usually best for depl oyment 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 sa fety 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 eq uipment and their availability

• Previous contingency planning contained in the appropriate Area Contingency Plan, and currently for Louisiana, The State of Loui siana Initial Oil Spill Response Plan, Deep Water Horizon, dated 2 May 2010 (La. OSRP)

Actions

Placement of boom

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

• Assess timing of booming operations to ensure it is where it needs to be at time of impact. Consider:Repsol E&P USA Inc. Page H-8 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 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 site s 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 tide lines to minimize waste

• Staging of equipment and housing of respons e personnel as close to the job site as possible to maximize on-site work time

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

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

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

• Passive clean up of marshes should be consider ed and appropriate stoc ks of sorbent boom and/or sweep obtained

• Earthen berms and shoreline protection boom may be considered to protect sensitive inland areasRepsol E&P USA Inc. Page H-9 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Decanting Strategy Recovered oil and water mixtures will typically se parate into distinct phases when left in a quiescent state. When separati on occurs, the relatively clean water phase can be siphoned or decanted back to the recovery point with minima l, if any, impact. Decan ting therefore increases the effective on-site oil storage capacity a nd 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 rela tion 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 a nd/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 opera tions ceased when seas reache d 5-6 feet and vessels were often recalled to port when those conditions were exceeded. Systems below are some of the most up-to-date systems available and were employed during the DWH spill.

Boom 3 foot seas, 20 knot winds Dispersants Winds more than 25 knots Visibility less than 3 nautical miles Ceiling less than 1,000 feet. FRU 8 foot seas HOSS Barge/OSRB 8 foot seas Koseq Arms 8 foot seas OSRV 4 foot seasRepsol E&P USA Inc. Page H-10 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Environmental Conditions in the GOM Louisiana is situated between the easterly and westerly wind belts, and therefore, experiences westerly winds during the wint er and easterly winds in the summer. Average wind speed is generally 14-15 mph along the coast. Wave he ights 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 temperatur e will range from 50 and 60  ̊ F.

The Atlantic and Gulf of Mexico hurricane season is officially from 1 June to 30 December. 97% of all tropical activity occurs w ithin this window. The Atlantic ba sin shows a very peaked season from August through October, with 78% of the tropical storm days, 87% of the minor (SaffirSimpson Scale categories 1 and 2) hurricane days, and 96% of the major (Saffir-Simpson categories 3, 4 and 5) hurricane days occurri ng then. Maximum activity is in early to mid September. Once in a few years there may be a hurri cane occurring "out of season" - primarily in May or December. Globally, September is the mo st active month and May is the least active month.Repsol E&P USA Inc. Page H-11 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) FIGURE 1 TRAJECTORY BY LAND SEGMENT

Trajectory of a spill and the probability of it impacting a land segment have been projected utilizing Repsol’s WCD and information in the BSEE Oil Spill Risk Analysis Model (OSRAM) for the Central and Western Gulf of Mexico available on the BSEE website using 30 day impact. The results are tabulated below.

Area/Block OCS-G Launch Area Land Segment and/or Resource Conditional Probability (%) within 30 days

Drill and complete 3 wells

WR 365, Well A

170.4 miles from shore G33967 C47 Matagorda County, TX Brazoria County, TX Galveston County, TX Jefferson County, TX Cameron Parish, LA Vermilion Parish, LA Terrebonne Parish, LA Plaquemines Parish, LA 1 1 2 1 3 1 1 1Repsol E&P USA Inc. Page H-12Initial Exploration Plan December, 2011Walker Ridge Block 365 (OCS-G 33967)WCD Scenario– BASED ON WELL BLOWOUT DURING DRILLING OPERATIONS(170.4 miles from shore)45,698 bbls of crude oil (Volume considering natural weathering)API Gravity 28°FIGURE 2 – Equipment Response Time to WR 365, Well ADispersants/SurveillanceDispersant/SurveillanceDispersantCapacity (gal)StorageCapacityPersonsReq.From Hrs to ProcureHrs toLoadoutTravel tositeTotal HrsCGABasler 67T 2000 NA 2 Houma 1 1 1.1 3.1ASIDC 3 1200 NA 2 Houma 1 1 1.4 3.4DC 3 1200 NA 2 Houma 1 1 1.4 3.4Aero Commander NA NA2 Houma 1 1 1.1 3.1Offshore ResponseOffshore Equipment NoStagingEDRCStorageCapacityVOOPersonsRequiredFromHrs toProcureHrs toLoadoutHrs toGOMTravel toSpill SiteHrs toDeployTotalHrsCGAHOSS Barge 43000 4000 3 Tugs 8 Harvey 7 0 5 21.3 1 34.3T&T Marine (available through contract with CGA)Koseq Skimming Arms (2) 35658 4000 2 Utility 12 Leeville 1 12 2 15.4 2 32.4Recovered Oil Storage NoStagingEDRCStorageCapacityVOOPersonsRequiredFromHrs toProcureHrs toLoadoutHrs toGOMTravel toSpill SiteHrs toDeployTotalHrsEnterprise Marine Services LLC (available through contract with CGA)CTCo 2603 NA 25000 1 Tug 6 Amelia 4 12 4 23.13 1 44.13CTCo 2604 NA 20000 1 Tug 6 Amelia 4 12 4 23.13 1 44.13CTCo 2607 NA 23000 1 Tug 6 Amelia 4 12 4 23.13 1 44.13CTCo 2608 NA 23000 1 Tug 6 Amelia 4 12 4 23.13 1 44.13CTCo 2609 NA 23000 1 Tug 6 Amelia 4 12 4 23.13 1 44.13Repsol E&P USA Inc. Page H-13Initial Exploration Plan December, 2011Walker Ridge Block 365 (OCS-G 33967)Staging Area: FourchonOffshore Equipment WithStagingEDRCStorageCapacityVOOPersonsReq.FromHrs toProcureHrs toLoadoutTravel toStagingTravel toSiteHrs toDeployTotalHrsCGAFRU (1) + 100 bbl Tank (2) 3770 200 1 Utility 6 Belle Chasse 1 2 2.5 15.4 1 21.9FRU (1) + 100 bbl Tank (2) 3770 200 1 Utility 6 Galveston 1 2 7 15.4 1 26.4FRU (3) + 100 bbl Tank (5) 11310 500 1 Utility 6 Houma 1 2 1 15.4 1 20.4FRU (1) + 100 bbl Tank (2) 3770 200 1 Utility 6 Ingleside 1 2 9.5 15.4 1 28.9FRU (1) + 100 bbl Tank (2) 3770 200 1 Utility 6 Lake Charles 1 2 4 15.4 1 23.4FRU (2) + 100 bbl Tank (4) 7540 400 1 Utility 6 Venice 1 2 4 15.4 1 23.4Offshore Equipment WithStagingEDRCStorageCapacityVOOPersonsReq.FromHrs toProcureHrs toLoadoutTravel toStagingTravel toSiteHrs toDeployTotalHrsCGA42” Auto Boom (5000’) NA NA 10 Crew20 Belle Chasse 1 2 2.5 15.4 1 21.942” Auto Boom (5000’) NA NA 10 Crew 20 Galveston 1 2 7 15.4 1 26.442” Auto Boom (5000’) NA NA 10 Crew 20 Houma 1 2 1 15.4 1 20.442” Auto Boom (2500’) NA NA 6 Crew 12 Ingleside 1 2 9.5 15.4 1 28.942” Auto Boom (5000’) NA NA 10 Crew20 Lake Charles 1 2 4 15.4 1 23.442” Auto Boom (2500’) NA NA 6 Crew 12 Pascagoula 1 2 4 15.4 1 23.41000’ Hydro-Fire Boom NA NA 8 Utility 40 Harvey 1 4 2 15.4 6 28.4Repsol E&P USA Inc. Page H-14Initial Exploration Plan December, 2011Walker Ridge Block 365 (OCS-G 33967)Nearshore ResponseNearshore Equipment NoStagingEDRCStorageCapacityVOOPersonsRequiredFromHrs toProcureHrs toLoadoutHrs toGOMTravel toSpill SiteHrs toDeployTotalHrsCGA46’ FRV 5000 65 NA 4 Lake Charles 1 0 1 2 0 4Enterprise Marine Services LLC (available through contract with CGA)CTCo 2605 NA 20000 1 Tug 6 Amelia 4 12 4 12.5 1 33.5Staging Area: CameronNearshore and InlandSkimmers With StagingEDRCStorageCapacityVOOPersonsReq.FromHrs toProcureHrs toLoadoutTravel toStagingTravel toDeploymentHrs toDeployTotalHrsCGASWS Egmopol 3000 100 NA 3 Galveston 1 2 3.5 2 0 8.5SWS Egmopol 3000 100 NA 3 Houma 1 2 4 2 0 9SWS Marco 3588 34 NA 3 Houma 1 2 4 2 0 9SWS Marco 3588 20 NA 3 Lake Charles 1 2 1 2 0 6Rope Mop 77 2 0 3 Belle Chasse 1 2 4.5 2 0 9.5RO Storage Barge NA 249 Towed 0 Galveston 1 2 3.5 2 0 8.5RO Storage Barge NA 249 Towed 0 Houma 1 2 4 2 0 9RO Storage Barge NA 249 Towed 0 Lake Charles 1 2 1 2 0 6RO Storage Barge NA 249 Towed 0 Venice 1 2 6.5 2 0 11.5Repsol E&P USA Inc. Page H-15Initial Exploration Plan December, 2011Walker Ridge Block 365 (OCS-G 33967)Shoreline ProtectionStaging Area: CameronShoreline ProtectionBoomVOOPersonsReq.Storage/WarehouseLocationHrs toProcureHrs toLoadoutTravel toStagingTravel toDeployment SiteHrs toDeployTotal HrsOil Mop (available through Letter of Intent)10,000’ 18” Boom 4 Crew 10 New Iberia, LA 1 1 2.5 2 3 9.510,000’ 18” Boom 4 Crew 10 Houston, TX 1 1 2.5 2 3 9.510,000’ 18” Boom 4 Crew 10 Port Arthur, TX 1 1 1.25 2 3 8.25Beach Boom EDRCStorageCapacityVOOPersonsReq.FromHrs toProcureHrs toLoadoutTravel toStagingTravel toDeploymentHrs toDeployTotalHrsCGABeach Boom (2000’) NA NA NA 6 Galveston 1 2 3.5 1 2 9.5Beach Boom (1000’) NA NA NA 4 Ingleside 1 2 6 1 2 12Beach Boom (2000’) NA NA NA6 Pascagoula 1 2 5.5 1 2 11.5Wildlife Response EDRCStorageCapacityVOOPersonsReq.FromHrs toProcureHrs toLoadoutTravel toStagingTravel toDeploymentHrs toDeployTotalHrsCGAWildlife Support Trailer NA NA NA 2 Houma 1 2 4 1 2 10Bird Scare Guns (24) NA NA NA2 Belle Chasse 1 2 4.5 1 2 10.5Bird Scare Guns (12) NA NA NA 2 Galveston 1 2 3.5 1 2 9.5Bird Scare Guns (24) NA NA NA 2 Houma 1 2 4 1 2 10Bird Scare Guns (12) NA NA NA 2 Ingleside 1 2 6 1 2 12Bird Scare Guns (24) NA NA NA 2 Lake Charles 1 2 1 1 2 7Bird Scare Guns (24) NA NANA 2 Pascagoula 1 2 5.5 1 2 11.5Response Asset TotalOffshore EDRC 112,588Offshore Recovered Oil Storage 123,700Nearshore / Shallow Water EDRC 18,253Nearshore / Shallow Water Recovered Oil Storage 21,317Repsol E&P USA Inc. Page I-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX I ENVIRONMENTAL MONITORING INFORMATION

(A) MONITORING SYSTEMS Repsol will visually observe the sea, monitor fl uid volumes and pressures to determine if there are any leaks, will monitor the wellhead area subs ea with an ROV, monito r surface gas detectors, current meters and visual observation of the sea surface from the rig and from support vessels.

(B) INCIDENTAL TAKES There is no reason to believe that any of the en dangered species or marine mammals as listed in the ESA will be “taken” as a result of th e operations proposed under this plan.

To date, it has been documented that the use of explosives and/or seis mic devices can affect marine life. Operations proposed in this plan wi ll not be utilizing either of these devices.

(C) FLOWER GARDEN BANKS NATIONAL MARINE SANCTUARY Walker Ridge Block 365 is not located in the Fl ower Garden Banks National Marine Sanctuary; therefore, the requested informati on is not required in this EP.Repsol E&P USA Inc. Page J-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### APPENDIX J LEASE STIPULATIONS INFORMATION
Exploration activities are subjec t to the following stipulation attached to Lease OCS-G 33967 Walker Ridge Block 365.

Marine Protected Species Lease Stipulation No 8 is meant to reduce the potential taking of mari ne protected species. Repsol will operate in accordan ce with NTL 2007-G04, to minimize the risk of vess el strikes to protected species and report observa tions of injured or dead protec ted species, and the prevention of intentional and/or accidental introducti on of debris into th e marine environment.Repsol E&P USA Inc. Page L-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) APPENDIX K ENVIRONMENTAL MITIGATION MEASURES INFORMATION

(A) INCIDENTAL TAKES Repsol will adhere to the requirements as set forth in the following documents, as applicable, to avoid or minimize impacts to any of the species listed in the ESA as a result of the operations conducted herein:

• NTL 2007-G04, “Vessel Strike Avoidance and Injured/Dead Protected Species Reporting”

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

• NTL 2007-G02, “Implementation of Seismic Su rvey Mitigation Measures and Protected Species Observer Program”Repsol E&P USA Inc. Page L-2 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) APPENDIX L SUPPORT VESSELS AND AI RCRAFT INFORMATION

(A) GENERAL The most practical, direct route from the s horebase as permitted by weather and traffic conditions will be utilized.

Type Maximum Fuel Tank Capacity Maximum Number in Area at Any Time Trip Frequency or Duration Crew Boat 23,500 gallons 1 4/week Supply Boat 280,000 gallons 1 2/week
Helicopters 412 gallons 1 7/week

(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’ 1,500 gallons 3/month Shortest route from Fourchon, LA to Walker Ridge Block 365 *Please note the actual vessels have not yet been contracted.

(D) SOLID AND LIQUID WASTE TRANSPORTATION Table 2, “ Wastes You Will Transport and/or Dispose of Onshore” is included in this section as Attachment L-1.

(E) VICINITY MAP Enclosed as Attachment L-2 is a vicinity map showing the location of the activities proposed herein relative to the shoreline w ith the distance of th e proposed activities from the shoreline and the primary route(s) of the support vessels and aircraft that will be used when traveling between the onshore support facilities and the dr illing unit.please specify whether the amount reported is a total or per welSolid and Liquid WastestransportationType of Waste Composition Transport Method Name/Location of Facility Amount Disposal MethodWill drilling occur ? If yes, fill in the muds and cuttings.Oil-based drilling fluid or mud NA NA NA NA NASynthetic-based drilling fluid or mudSpent synthetic baseddrilling fluidsCutting boxes on supply boatUS Liquids, Fourchon, LAorNewpark Environmental,Fourchon, LA. 500 bbls/wellLand FarmingorLand Farming orInjectionSynthetic-based drilling fluid or mudUsed synthetic baseddrillingfluidsDrums or tanks on supply boatMI Swaco, Fourchon, LA17,443bbls/wellRecycledCuttings wetted with Water-based fluidDrl Cttgs & WBMNANA NA NACuttings wetted with Synthetic-based fluidDrl Cttgs & SBMNANANA NACuttings wetted with oil-based fluids NA NA NA NA NAWill you produce hydrocarbons? If yes fill in for produced sand.Produced sand NA NA NA NA NATrash and debris (non-recyclable)Non-recyclable nonhazardous trash and debris Storage bins on supply boatMartin Terminal/Sweede,Fourchon, LA 10 cuft/day River Birch LandfillRecyclable trash and debrisRecyclable non-hazardoustrash and debris Bags or storage bins on supply boat Techoil, New Iberia, LA. 25 lbs/day RecycledRecyclable trash and debrisBatteries, glass, lamp andlight tubesVendor supplied DOT storage binson supply vessel then trucked tovendor facility.American Recovery,Houma, LA. 2 bbls/month RecycledUsed oilUsed oil, oil filters, rags,pads, empty drums, cookingoilVendor supplied DOT storage binson supply vessel then trucked tovendor facility.American Recovery,Houma, LA.107bbls/month RecycledTank wash water NA NANANA NAChemical product wastesPaints, solvents, unusedchemicals, etc.Vendor supplied DOT storage binson supply vessel then trucked tovendor facility.American Recovery,Houma, LA. 1 bbl/dayHazardous wastedisposal procedures.NOTE: If you will not have a type of waste, enter NA in the row.ATTACHMENT L-1WASTES YOU WILL TRANSPORT AND /OR DISPOSE OF ONSHOREWaste DisposalWill you have additional wastes that are not permitted for discharge? If yes,fill in the appropriate rows.Projected generated waste! ! ! ! ! !
! !

! ! ! ! ! ! ! !

G r e e n C a n y o n

W a l k e r R i d g e L u n d S h i p S h o a l

A t w a t e r V a l l e y S o u t h T i m b a l i e r

M i s s i s s i p p i C a n y o n E u g e n e I s l a n d

E w i n g B a n k W e s t D e l t a

S h i p S h o a l S o u t h G r a n d I s l e

S o u t h T i m b a l i e r S o u t h W e s t D e l t a S o u t h S o u t h P e l t o F o u r c h o n C o c o d r i e G r a n d I s l e R i v e r R i d g e

T e r

r e b o n n e L a f o u r c h e P l a q u e m i n e s J

e f

f e r

s o n 

# R e p s o l E & P U S A I n c

. V i c i n i t y M a p W a l k e r R i d g e 3 6 5

W R 3 6 5 ~ 1 7 0

. 4 M i l e s t o S h o r e

~ 1 8 6 M i l e s t o F

o u r c h

o n

, L A

S h

o r e b

a s eRepsol E&P USA Inc. Page M-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) APPENDIX M ONSHORE SUPPORT FACILITIES INFORMATION

(A) GENERAL Name of Shorebase Location Existing/New/Modified C-Port 2 Port Fourchon, LA Existing

(B) SUPPORT BASE CONSTRUCTION OR EXPANSION There will be no new construction of an onshor e support base, nor will we expand the existing shorebase as a result of the operations proposed in this Exploration Plan.

(C) SUPPORT BASE CONSTRUC TION OR EXPANSION TIMETABLE Not applicable to this plan.

(D) WASTE DISPOSAL Table 2, “Wastes You Will Transport and/or Dispose of Onshore” is included in Appendix L as Attachment L-1.Repsol E&P USA Inc. Page N-1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) APPENDIX N COASTAL ZONE MANAGEMEN T (CZMA) INFORMATION

Relevant enforceable policies were considered in certifying consiste ncy for Louisiana. A certificate of Coastal Zone Management Consistency for the state of Louisiana is enclosed as Attachment N-1

.TEXAS As authorized by the Federal Coastal Zone Management Act (CZMA), the State of Texas developed a Coastal Management Program (CMP) to allow for the review of proposed Federal license and permit activities affecting any coastal use or resource, in or outside of the Texas Coastal Zone.

The OCS related oil and gas exploratory and deve lopment activities having potential impact on the Texas Coastal Zone are based on the location of the proposed facilities, access to those sites, best practical techniques for dr illing locations, drilling equipmen t guidelines for the prevention of adverse environmental effects, effective environmental protection, emergency plans and contingency plans.

Below are topics found in other sections of the pl an and have been cross referenced for ease in locating:

Topic Cross Reference Comments Construction, Operation and Maintenance of Oil and Gas Exploration and Production Facilities APPENDIX A These are exploratory operations, therefore, no construction of facilities is proposed. Discharges of Wastewater and Disposal of Waste from Oil and Gas Exploration and Production Activities APPENDIX F and L No discharges are proposed in Texas
waters. Construction and Operation of Solid Waste Treatment, Storage, and Disposal Facilities APPENDIX L No construction of solid waste, treatment or storage facilities is proposed. Prevention, Response, and Remedia tion of Oil Spills APPENDIX H Discharge of Municipal and Industrial Waste Water to Coastal Waters APPENDIX F and L No discharges are proposed in Texas
waters. Development in Critical Areas APPENDIX E Construction of Waterfront Facilities and Other Structures on Submerge lands APPENDIX L

Dredging and Dredged Material Di sposal and Placement APPENDIX H Construction in the Beach / Dune System APPENDIX H Alteration of Coastal Hist oric Areas APPENDIX H Transportation APPENDIX L Emission of Air Pollutants APPENDIX G Appropriations of Water There will be no fresh water appropriations as a result of our operations Marine Fishery Management APPENDIX E Administrative Policies Proposed operations are 170 miles offshore, therefore, not subject to Section 501.15 regarding major actionsRepsol E&P USA Inc. Page O

- 1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) APPENDIX O ENVIRONMENTAL IMPACT ANALYSIS (EIA) 

## Repsol E&P USA Inc. (Repsol)

Initial Exploration Plan Walker Ridge Block 365 OCS-G 33967

(A) IMPACT PRODUCING FACTORS ENVIRONMENTAL IMPACT ANALYSIS WORKSHEET

Environment

Resources Impact Producing Factors (IPFs) Categories and Examples Refer to recent GOM OCS Lease Sale EIS for a more complete list of IPFs

Emissions (air, noise, light, etc.) Effluents (muds, cutting, other discharges to

the water column or seafloor) Physical disturbances to the

seafloor (rig or anchor emplacements, etc.) Wastes sent to shore for treatment or disposal Accidents (e.g., oil spills, chemical spills, H 2 S releases) Discarded Trash & Debris

Site-specific at Offshore Location Designated topographic features (1) (1) (1) Pinnacle Trend area live bottoms (2) (2) (2) Eastern Gulf live bottoms (3) (3) (3)

Benthic communities (4) Water quality X X

Fisheries X X Marine Mammals X(8) X X(8) X Sea Turtles X(8) X X(8) X Air quality X(9) Shipwreck sites (known or potential) (7)

Prehistoric archaeological sites (7)

Vicinity of Offshore Location Essential fish habitat X X(6) Marine and pelagic birds X X Public health and safety (5)

Coastal and Onshore Beaches X(6) X Wetlands X(6) Shore birds and coastal nesting birds X6)

Coastal wildlife refuges

Wilderness areasRepsol E&P USA Inc. Page O

- 2 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Footnotes for Environmental Impact Analysis Matrix

Activities that may affect a marine sanctuary or topographic feature. Spec ifically, if the well or platform site or any anchors will be on the seafloor within the: 4-mile zone of the Flower Garden Banks, or the 3-mile zone of Stetson Bank; 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; Essential Fish Habitat (EFH) criteria of 500 ft. from any no-activity zone; or Proximity of any submarine bank (500 ft. buffer zone) with relief greater than 2 meters that is not protected by the Topographic Features Stipulation attached to an OCS lease. Activities with any bottom disturbance within an OCS lease block protected through the Live Bottom (Pinnacle Trend) Stipulation attached to an OCS lease. Activities within any Eastern Gulf OCS block where seafloor habitats are protected by the Live Bottom (Low-Relief) Stipulation attached to an OCS lease. Activities on blocks designated by the BOEM as being in water depths 300 meters or greater. Exploration or production activities where H2S concentr ations greater than 500 ppm might be encountered. All activities that could result in an accide ntal 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. All activities that involve seafloor disturbances, including anchor emplacements, in any OCS block designated by the BOEM as having high-probability for the o ccurrence 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 a prehistoric site that no im pact would occur, the EIA can note that in
a sentence or two. All activities that you determine might have an adverse effect on endangered or threatened marine mammals or sea turtles or their critical habitats. Production activities that involve trans portation of produced fluids to shor e using shuttle tankers or barges.Repsol E&P USA Inc. Page O

- 3 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 

### (B) Analysis

Site-Specific at Walker Ridge Block 365 Proposed operations consist of the drill ing, testing, and completion of 3 wells. The operations will be conducted with a DP semisubmersible.

1. Designated Topographic Features Potential IPFs on topographic features include effluents, and accidents.

Effluents: Walker Ridge Block 365 is 92 miles from th e closest designated Topographic Features Stipulation Block (Sweet Ba nk); therefore, no adverse impacts are expected.

Accidents: It is unlikely that an acci dental surface or subsurface spill would occur from the proposed activities (refer to statistics in Item 5 , Water Quality). Oil spills cause damage to benthic organisms only if the oil contacts the organisms. Oil from a surface spill can be driven into the water column; measurable amounts have been documented down to a 10 m depth. At this de pth, the oil is found only at concentrations several orders of magnitude lower than the amount shown to have an effect on corals. Because the crests of topographic fe atures in the Northern Gulf of Mexico are found below 10 m, no oil from a surface spill could reach their sessile biota. Oil from a subs urface spill is not applicable due to the distance of these blocks from a topographic area. The activities proposed in this plan will be covered by Repsol’s Regional OSRP (refer to information submitted in Appendix H ).

There are no other IPFs (including emissions, physical disturbances to the seafloor and wastes sent to shore for disposal) from the proposed activitie s, which could impact topographic features.

2. Pinnacle Trend Area Live Bottoms Potential IPFs on pinnacle trend area live bo ttoms include effluent s and accidents.

Effluents: Walker Ridge Block 365 is 252 miles from th e closest live bottom (p innacle trend) area; therefore, no adverse impacts are expected.

Accidents: It is unlikely that an acci dental surface or subsurface spill would occur from the proposed activities (refer to statistics in Item 5 , Water Quality). Oil spills have the potential to foul benthic communities and cause lethal and sublethal effects on live bottom organisms. Oil from a surface spill can be driven into the water column; measurable amounts have been documented down to a 10 m depth. At this depth, the oil is found only at concentr ations several orders of magnitude lower than the amount shown to have an effect on marine organisms. Oil from a subsurface spill is not applicable due to the distance of these blocks fr om a live bottom (pinnacl e trend) area. The activ ities proposed in this plan will be covered by Re psol’s Regional OSRP (refer to information submitted in Appendix H ).Repsol E&P USA Inc. Page O

- 4 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) There are no other IPFs (including emissions, physical disturbances to the seafloor and wastes sent to shore for disposal) from the proposed activities which could impact a liv e bottom (pinnacle trend) area.

3. Eastern Gulf Live Bottoms
Potential IPFs on Eastern Gulf live bottoms include effluents and accidents.

Effluents: Walker Ridge Block 365 is not located in an area characterized by the existence of live bottoms; therefore, no adverse impacts are expected.

Accidents: It is unlikely that an acci dental surface or subsurface spill would occur from the proposed activities (refer to statistics in Item 5 , Water Quality). Oil spills cause damage to live bottom organisms only if the oil contacts the organisms. O il from a surface spill can be driven into the water column; measurable amounts have been documented dow n to a 10 m depth. At this depth, the oil is found only at concentrations severa l orders of magnitude lower than the amount shown to have an effect on marine invertebrates. Oil from a subsurface spill is not applicable due to the distance of these blocks from a live bottom area. The activities propos ed in this plan will be covered by Repsol’s Regional OSRP (refer to information submitted in Appendix H ).

There are no other IPFs (including emissions, physical disturbances to the seafloor and wastes sent to shore for disposal) from the proposed activities which could impact an Eastern Gulf live bottom area.

4. Benthic Communities There are no IPFs (including emissi ons, physical disturbances to the se afloor, wastes sent to shore for disposal, or accidents) from the proposed activities that could cause impacts to benthic communities.

A DP semisubmersible is being used for the propos ed activities; th erefore, only an insignificant amount of seafloor will be disturbed. Because physic al disturbances to the seafloor will be minimized by the use of a DP semisubmersible, Repsol’s pr oposed operations in Walk er Ridge Block 365 would not cause impacts to benthic communities.

5. Water Quality
IPFs that could result in water quality degradation from the propos ed operations in Walker Ridge Block 365 include efflue nts and accidents.

Effluents: Levels of contaminants in drilling muds and cuttings and produced water discharges, discharge-rate restrictions a nd monitoring and toxicity testi ng are regulated by the EPA NPDES permit, thereby eliminating many significant biologica l or ecological effects. Operational discharges are not expected to cause significant adverse im pacts to water quality.Repsol E&P USA Inc. Page O

- 5 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Accidents: Oil spills have the potential to alter offshor e water quality; however, it is unlikely that an accidental surface or subsurface spill would occur from the proposed activities. Between 1980 and 2000, OCS operations produced 4.7 billion barrels of oil and spilled only 0.001 percen t of this oil, or 1 bbl for every 81,000 bbl produced. The spill risk related to a diesel spill from drilling operations is even less. Between 1976 and 1985, (years for which data were collected), there were 80 reported diesel spills greater than one barr el associated with drilling activit ies. Considering that there were 11,944 wells drilled, this is a 0.7 percent probability of an occurrence. If a spill were to occur, the water quality of marine waters w ould be temporarily affected by th e dissolved components and small oil droplets. Dispersion by currents and microbial degradation would remove the oil from the water column and dilute the constituents to background leve ls. Historically, changes in offshore water quality from oil spills have only been detected during the lif e of the spill and up to several months afterwards. Most of the components of oil are in soluble in water and therefore floa t. The activities proposed in this plan will be covered by Repsol’s Regional Oil Spill Response Plan (refer to information submitted in Appendix H ).

There are no other IPFs (including em issions, physical disturbances to th e seafloor, and wastes sent to shore for disposal) from the proposed activitie s which could cause impacts to water quality.

6. Fisheries IPFs that could cause impacts to fi sheries as a result of the proposed operations in Walker Ridge Block 365 include effluents and accidents.

Effluents: Effluents such as drilling fluids and cuttings discharges contain components and properties which are detrimental to fishery resources. Moderate petroleum and metal contamination of sediments and the water column can occur out to several hundr ed meters down-current from the discharge point. Offshore discharges are expected to disperse and dilute to very ne ar background levels in the water column or on the seafloor within 3,000 m of the discharge point, and are expected to have negligible effect on fisheries.

Accidents: An accidental oil spill has the potential to cause some detrimental effects on fisheries; however, it is unlikely that su ch an event would occur from the proposed activities (refer to Item 5

, Water Quality). The effects of oil on mobile adult finfish or shellfis h would likely be sublethal and the extent of damage would be reduced to the capacity of adult fish and shellfish to avoid the spill, to metabolize hydrocarbons, and to excrete both me tabolites and parent compounds. The activities proposed in this plan will be covered by Repsol’s Regional OSRP (refer to information submitted in Appendix H ).

There are no IPFs from emissions, physical disturbanc es to the seafloor or wastes sent to shore for disposal from the proposed activities wh ich could cause impacts to fisheries.Repsol E&P USA Inc. Page O

- 6 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 7. Marine Mammals
GulfCet II studies revealed that cetaceans of the continental shelf and shelf-edge were almost exclusively bottlenose dolphin and Atlantic spotted dolphin. Squid ea ters, including dwarf and pygmy killer whale, Risso’s dolphin, rough-toothed dolphi n, and Cuvier’s beaked whale, occurred most frequently along the upper slope in areas outside of anticyclones. I PFs that could cause impacts to marine mammals as a result of the proposed operati ons in Walker Ridge Block 365 include emissions, effluents, discarded trash a nd debris, and accidents.

Emissions: Noises from drilling activities, support vessels and helicopters may elicit a startle reaction from marine mammals. This reaction may lead to disruption of marine mammals’ normal activities. Stress may make them more vulnerable to parasite s, disease, environmental contaminants, and/or predation (Majors and Myrick, 1990) . There is little conclusive evid ence for long-term displacements and population trends for marine mammals relative to noise.

Effluents: Drilling fluids and cuttings discharges c ontain components which may be detrimental to marine mammals. Most operational discharges are diluted and dispersed upon release. Any potential impact from drilling fluids would be indirect, either as a result of impacts on prey items or possibly through ingestion in the food chain (API, 1989).

Discarded trash and debris: Both entanglement in, and ingestion of debris have caused the death or serious injury of marine mammals (Laist, 1997; MMC, 1999). The limited amount of marine debris, if any, resulting from the proposed ac tivities is not expected to subs tantially harm marine mammals. Operators are prohibited from de liberately discharging debris as mandated by MARPOL-Annex V and the Marine Plastic Pollution Research and Control Act, and regulations imposed by various agencies including the United States Coast Guard (USCG) and the Environmental Protection Agency (EPA).

Repsol will operate in accordance with the regulations and also av oid accidental loss of solid waste items by maintaining waste management plans, mani festing trash sent to s hore, and using special precautions such as covering outside trash bins to prevent accidental loss of solid waste. Special caution will be exercised when ha ndling and disposing of small it ems and packaging materials, particularly those made of non-biod egradable, environmentally persiste nt materials such as plastic or glass.

Informational placards will be post ed on all vessels and f acilities having sleeping or food preparation capabilities. All offshore personne l, including contractor s and other support se rvices-related personnel (e.g. helicopter pilots, vessel captai ns and boat crews) will be indoctrinated on waste procedures, and will view the video (or Mi crosoft PowerPoint presentation), “Think About It” ( previously “All Washed Up: The Beach Litter Problem” ). Thereafter, all personnel will view the marine trash and debris training video annually. Offshore pe rsonnel will also receive an expl anation from Repsol management or the designated lease operator management that emphasizes their commitment to waste management in accordance with NTL No. 2007-G03.Repsol E&P USA Inc. Page O

- 7 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Accidents: Collisions between support vessels and cetaceans would be unusual events, however should one occur, death or injury to marine mammals is possible. Contract vessel operators can avoid marine mammals and reduce potential deaths by main taining a vigilant watch for marine mammals and maintaining a safe distance when they are sighted. Vessel crews shoul d use a reference guide to help identify the twenty-eight species of whales and dolphins, and the singl e species of manatee that may be encountered in the Gulf of Mexico OCS. Vessel crews must report si ghtings of any injured or dead protected marine mammal species immediately, regardless of whether the injury or death is caused by their vessel, to the Marine Mammal and Sea Tu rtle Stranding Hotline at (888) 404-3922, the NMFS Southeast Regional Office at (727 ) 824-5312, or the Marine Mammal Stranding Network at (305) 862- 2850. In addition, if the injury or death was cause d by a collision with a cont ract vessel, the BOEM must be notified within 24 hours of the strike by email to protectedspecies@boemre.gov . If the vessel is the responsible party, it is required to remain available to assist the respective salvage and stranding network as needed.

Oil spills have the potential to cause sublethal oil-related injuries an d spill-related deaths to marine mammals. However, it is unlikely that an accidental oil spill would occur from the proposed activities (refer to Item 5 , Water Quality). Oil spill response activit ies may increase vessel traffic in the area, which could add to changes in cetac ean behavior and/or distribution, thereby causing a dditional stress to the animals. The effect of oil dispersants on cetaceans is not known. Th e acute toxicity of oil dispersant chemicals included in Re psol’s OSRP is considered to be low when compared with the constituents and fractions of crude oils and diesel pr oducts. The activities proposed in this plan will be covered by Repsol’s OSRP (refer to in formation submitted in accordance with Appendix H ).

There are no other IPFs (including physical disturbances to the seafloor) from the proposed activities which could impact marine mammals.

8. Sea Turtles IPFs that could cause impacts to sea turtles as a result of the proposed opera tions include emissions, effluents, discarded trash and debris, and accidents. GulfCet II studies sighted most loggerhead, Kemp’s ridley and leatherback sea turtles over shel f waters. Historically these species have been sighted up to the shelf’s e dge. They appear to be more abundant east of the Mississippi River than they are west of the river (Fritts et al., 1983b; Lo hoefener et al., 1990). Deep wa ters may be used by all species as a transitory habitat.

Emissions: Noise from drilling activities , support vessels, and helicopter s may elicit a startle reaction from sea turtles, but this is a temporary disturbance.

Effluents: Drilling fluids and cuttings discharges are not known to be lethal to sea turtles. Most operational discharges are diluted and dispersed upon release. Any potential impact from drilling fluids would be indirect, either as a result of impacts on prey items or possibly through ingestion in the food chain (API, 1989).Repsol E&P USA Inc. Page O

- 8 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Discarded trash and debris: Both entanglement in, and ingestion of, debris have caused the death or serious injury of sea turt les (Balazs, 1985). The limited amount of marine debris, if any, resulting from the proposed activities is not expected to substantia lly harm sea turtles. Oper ators are prohibited from deliberately discharging debris as mandated by MARPOL-Annex V and the Marine Plastic Pollution Research and Control Act, and regulations impose d by various agencies including the United States Coast Guard (USCG) and the Environmental Protec tion Agency (EPA). Repsol will operate in accordance with the regulations and also avoid acci dental loss of solid waste items by maintaining waste management plans, manifesting trash sent to shore, and using special precautions such as covering outside trash bins to prevent accidental lo ss of solid waste. Special caution will be exercised when handling and disposing of small items and pack aging materials, particularly those made of nonbiodegradable, environmentally persistent materials such as plastic or glass.

Informational placards will be post ed on all vessels and f acilities having sleeping or food preparation capabilities. All offshore personne l, including contractor s and other support se rvices-related personnel (e.g. helicopter pilots, vessel captai ns and boat crews) will be indoctrinated on waste procedures, and will view the video (or Mi crosoft PowerPoint presentation), “Think About It” ( previously “All Washed Up: The Beach Litter Problem” ). Thereafter, all personnel will view the marine trash and debris training video annually. Offshore pe rsonnel will also receive an expl anation from Repsol management or the designated lease operator management that emphasizes their commitment to waste management in accordance with NTL No. 2007-G03.

Accidents: Collisions between support vessels and s ea turtles would be unusual events, however should one occur, death or injury to sea turtles is possible. Contract vessel operators can avoid sea turtles and reduce potential deaths by maintaining a vigilant watch for sea turtles and maintaining a safe distance when they are sighted. Vessel crew s should use a reference guide to help identify the five species of sea turtles that may be encountere d in the Gulf of Mexico OCS. Vessel crews must report sightings of any injured or dead protected s ea turtle species immediately, regardless of whether the injury or death is caused by their vessel, to the Marine Mammal and Sea Turtle Stranding Hotline at (888) 404-3922, the NMFS Southeast Regional Office at (727) 824-5312, or the Marine Mammal Stranding Network at (305) 862-2850. In addition, if th e injury or death was caused by a collision with a contract vessel, the BOEM must be notified within 24 hour s of the strike by email to protectedspecies@boemre.gov . If the vessel is the res ponsible party, it is requi red to remain available to assist the respective salvage a nd stranding network as needed.

All sea turtle species and their life stages are vulnerable to the harmful effects of oil through direct contact or by fouling of th eir food. Exposure to oil can be fatal, pa rticularly to juveniles and hatchlings. However, it is unlikely that an accidental oil spill would occur from the proposed activities (refer to Item 5 , Water Quality). Oil spill respons e activities may increase vessel tr affic in the area, which could add to the possibility of collisions with sea turtles. The activities proposed in this plan will be covered by Repsol’s Regional Oil Spill Response Plan (refer to information submitted in accordance with Appendix H ).Repsol E&P USA Inc. Page O

- 9 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) There are no other IPFs (including physical disturbances to the seafloor) from the proposed activities which could impact sea turtles.

9. Air Quality The projected air emissions identified in Appendix G are not expected to affect the OCS air quality primarily due to distance to the shore or to any Prevention of Significant Deterioration Class I air quality area such as the Breton Wilderness Area. Walker Ridge Block 365 is beyond the 200 kilometer (124 mile) buffer for the Breton Wilderness Area and is 170.4 miles from the coas tline. Therefore, no special mitigation, monitoring, or reporting requirem ents apply with respect to air emissions.

Accidents and blowouts can release hydrocarbons or chemicals, which could cause the emission of air pollutants. However, these releases would not im pact onshore air quality because of the prevailing atmospheric conditions, emission height, emission rate s, and the distance of Walker Ridge Block 365 from the coastline. There are no ot her IPFs (including effl uents, physical disturba nces to the seafloor, wastes sent to shore for treatmen t or disposal) from the proposed activities which could impact air quality.

10. Shipwreck Sites (known or potential) Potential IPFs that could impact known or unknown shipwreck sites as a result of the proposed operations in Walker Ridge Block 365 in clude disturbances to the seafloor.

Physical disturbances to the seafloor: A DP semisubmersible is being used for the proposed activities; therefore, only an in significant amount of seafloor will be disturbed. Because physical disturbances to the seafloor will be minimized by th e use of a DP semisubmersible, Repsol’s proposed operations in Walker Ridge Block 365 woul d not cause impacts to shipwreck sites.

Additionally, Walker Ridge Block 365 is not located in or adjacent to an OCS block designated by BOEM as having a high probability for occurrence of shipwrecks, therefore, no adverse impacts are expected.

Repsol will perform an ROV survey imaging 100% of the seafloor with sector scanning sonar within a minimum 500’ radius of the proposed well location( s) prior to or upon comme ncement of operations. These locations will be certified by an authorized marine archaeologist and by Repsol to be clear of seafloor archaeological resources, including historic shipwrecks. Copi es of the certifications and a circle radius plat of the survey area will be submitted to the BOEM. Should a resource be encountered, Repsol will contact the BOEM imme diately and make every reasonable effort to preserve and protect that cultural resource.

There are no other IPFs (including emissions, effluents, wastes sent to shore for treatment or disposal, or accidents) from the proposed activities that could cause impacts to shipwreck sites.Repsol E&P USA Inc. Page O

- 10 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 11. Prehistoric Archaeological Sites Potential IPFs that could cause impacts to prehistori c archaeological sites as a result of the proposed operations in Walker Ridge Block 365 in clude disturbances to the seafloor.

Physical disturbances to the seafloor: A DP semisubmersible is being used for the proposed activities; therefore, only an in significant amount of seafloor will be disturbed. Because physical disturbances to the seafloor will be minimized by th e use of a DP semisubmersible, Repsol’s proposed operations in Walker Ridge Block 365 would not cau se impacts to prehistoric archaeological sites.

Repsol will perform an AUV/ROV su rvey imaging 100% of the seafloor with sector scanning sonar within a minimum 500’ radius of the proposed we ll location(s) prior to or upon commencement of operations. These locations will be certified by an authorized marine archaeologist and by Repsol to be clear of seafloor archaeological resources. Copies of the certifications and a circle radius plat of the survey area will be submitted to th e BOEM. Should a resource be encountered, Repsol will contact the BOEM immediately and make every reasonable effort to preserve a nd protect that cu ltural resource.

Additionally, Walker Ridge Block 365 is located outside the Archaeological Prehistoric high probability line, therefore, no adverse impacts are expected.

There are no other IPFs (including emissions, effluents, wastes sent to shore for treatment or disposal, or accidents) from the proposed activities which could impact pr ehistoric archeological sites.

Vicinity of Offshore Location

1. Essential Fish Habitat (EFH) IPFs that could cause impacts to EFH as a result of the proposed operations in Walker Ridge Block 365 include effluents and accidents. EFH includes all es tuarine and marine waters and substrates in the Gulf of Mexico.

Effluents: The Live Bottom Low Relief Stipulation, the Live Bottom (Pinnacle Trend) Stipulation, and the Eastern Gulf Pinnacle Tren d Stipulation would prevent most of the potential impacts on livebottom communities and EFH from operational waste di scharges. Levels of contaminants in drilling muds and cuttings and produced-water discharges, discharge-rate restrictions, and monitoring and toxicity testing are regulated by the EPA NPDES permit, there by eliminating many significant biological or ecological effects. Operational discha rges are not expected to cause significant adverse impacts to EFH.

Accidents: An accidental oil spill has the potential to cause some detrimental effects on EFH. Oil spills that contact coastal bays a nd estuaries, as well as OCS waters when pelagic eggs and larvae are present, have the greatest potential to affect fisher ies. However, it is unlikely that an oil spill wouldRepsol E&P USA Inc. Page O

- 11 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) occur from the proposed activities (refer to Item 5 , Water Quality). The activities proposed in this plan will be covered by Repsol’s Regional OSRP (refer to information submitted in Appendix H ).

There are no other IPFs (including emissions, physical disturbances to the seafloor and wastes sent to shore for treatment or disposal) from the proposed ac tivities which could impact essential fish habitat.

2. Marine and Pelagic Birds IPFs that could impact marine birds as a resu lt of the proposed activities include air emissions, accidental oil spills, and discarded trash a nd debris from vessel s and the facilities.

Emissions: Emissions of pollutants into the atmosphere from these activities are far below concentrations which could harm coastal and marine birds.

Accidents: An oil spill would cause lo calized, low-level petroleum hydrocarbon contamination. However, it is unlikely that an oil spill w ould occur from the propo sed activities (refer to Item 5

, Water Quality). Marine and pelagic birds feedi ng at the spill location ma y experience chronic, nonfatal, physiological stress. It is expected that few, if any, coas tal and marine birds would actually be affected to that extent. The activities proposed in this plan will be covered by Repsol’s Regional OSRP (refer to information submitted in Appendix H ).

Discarded trash and debris : Marine and pelagic birds could become entangled and snared in discarded trash and debris, or ingest small plastic debris, which can cause permanent injuries and death. Operators are prohibited from deliberatel y discharging debris as mandated by MARPOL-Annex V and the Marine Plastic Pollution Research and Control Act, and regulat ions imposed by various agencies including the United States Coast Guard (USCG) and the Environm ental Protection Agency (EPA). Repsol will operate in accordance with the regulations and also avoid accidental loss of solid waste items by maintaining waste mana gement plans, manifesting trash sent to shore, and using special precautions such as covering outside trash bins to prevent accidental loss of solid waste. Special caution will be exercised when ha ndling and disposing of small it ems and packaging materials, particularly those made of non-biod egradable, environmentally persiste nt materials such as plastic or glass. Informational placards will be posted on all vessels and facilities having sleeping or food preparation capabilities. All offshore personnel, including c ontractors and other support servicesrelated personnel (e.g. helicopter pilots, vessel captain s and boat crews) will be indoctrinated on waste procedures, and will view the video (or Microsoft PowerPoint presentation), “Think About It” ( previously “All Washed Up: The Beach Litter Problem” ). Thereafter, all personnel will view the marine trash and debris training video annually. Offshore personnel wi ll also receive an explanation from Repsol management or the designated l ease operator management that emphasizes their commitment to waste management in accordance w ith NTL No. 2007-G03. Debris, if any, from these proposed activities will seldom interact with marine and pelagic bi rds; therefore, the effects will be negligible.Repsol E&P USA Inc. Page O

- 12 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) There are no other IPFs (including e ffluents, physical disturbances to the seafloor, or wastes sent to shore for treatment or disposal) from the proposed activities which could impa ct marine and pelagic birds.

3. Public Health and Safety Due to Accidents. There are no IPFs (emissions, effluent s, physical disturbances to the se afloor, wastes sent to shore for treatment or disposal or accide nts, including an accidental H 2 S release) from the proposed activities which could cause impacts to public health and safety. In accordance with NTL No.’s 2008-G04, 2009-G27, and 2009-G31, sufficient information is included in Appendix D to justify our request that our proposed activities be classified by BSEE as H 2 S absent.

Coastal and Onshore

1. Beaches IPFs from the proposed activities th at could cause impacts to beaches include accidents (oil spills) and discarded trash and debris.

Accidents: Oil spills contacting beaches would have impacts on the use of recreational beaches and associated resources. Due to the distance from shore (170.4 miles) and the response capabilities that would be implemented, no significan t adverse impacts are expected. The activities proposed in this plan will be covered by Re psol’s Regional OSRP (refer to information submitted in Appendix H ).

Discarded trash and debris: Trash on the beach is recognized as a major threat to the enjoyment and use of beaches. There will only be a limited amount of marine debris, if any, resulting from the proposed activities. Operators ar e prohibited from deliberately di scharging debris as mandated by MARPOL-Annex V and the Marine Plastic Pollution Research and Control Act, and regulations imposed by various agencies including the United States Coast Guard (USCG) and the Environmental Protection Agency (EPA). Repsol will operate in accordance with the regulations and also avoid accidental loss of solid waste items by maintaining waste management pl ans, manifesting trash sent to shore, and using special precautions such as covering outside trash bins to prevent accidental loss of solid waste. Special caution will be exercised when handling a nd disposing of small items and packaging materials, particularly those made of non-biodegradable, envi ronmentally persistent materials such as plastic or glass.

Informational placards will be post ed on all vessels and f acilities having sleeping or food preparation capabilities. All offshore personne l, including contractor s and other support se rvices-related personnel (e.g. helicopter pilots, vessel captai ns and boat crews) will be indoctrinated on waste procedures, and will view the video (or Mi crosoft PowerPoint presentation), “Think About It” ( previously “All Washed Up: The Beach Litter Problem” ). Thereafter, all personnel will view the marine trash and debris training video annually. Offshore pe rsonnel will also receive an expl anation from Repsol managementRepsol E&P USA Inc. Page O

- 13 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) or the designated lease operator management that emphasizes their commitment to waste management in accordance with NTL No. 2007-G03.

There are no other IPFs (emissions, e ffluents, physical disturbances to the seafloor, or wastes sent to shore for treatment or disposal) from the proposed activities which could impact beaches.

2. Wetlands IPFs from the proposed activities th at could cause impacts to wetlands include accidents (oil spills) and discarded trash and debris.

Accidents: It is unlikely that an oil spill would occur from the proposed activities (refer to Item 5

, Water Quality). Due to the distance from shore (170.4 miles) and the respons e capabilities that would be implemented, no impacts are expected. The activi ties proposed in this plan will be covered by Repsol’s Regional OSRP (refer to information submitted in Appendix H ).

Discarded trash and debris: There will only be a limited amount of marine debris, if any, resulting from the proposed activities. Op erators are prohibited from delib erately discharging debris as mandated by MARPOL-Annex V and the Marine Plas tic Pollution Research and Control Act, and regulations imposed by various ag encies including the United States Coast Guard (USCG) and the Environmental Protection Agency (E PA). Repsol will operate in a ccordance with the regulations and also avoid accidental loss of so lid waste items by maintaining waste management plans, manifesting trash sent to shore, and using special precautions such as covering outside trash bins to prevent accidental loss of solid waste. Special caution will be exercised when handling and disposing of small items and packaging materials, particularly t hose made of non-biodegradable, environmentally persistent materials such as plastic or glass.

Informational placards will be post ed on all vessels and f acilities having sleeping or food preparation capabilities. All offshore personne l, including contractor s and other support se rvices-related personnel (e.g. helicopter pilots, vessel captai ns and boat crews) will be indoctrinated on waste procedures, and will view the video (or Mi crosoft PowerPoint presentation), “Think About It” ( previously “All Washed Up: The Beach Litter Problem” ). Thereafter, all personnel will view the marine trash and debris training video annually. Offshore pe rsonnel will also receive an expl anation from Repsol management or the designated lease operator management that emphasizes their commitment to waste management in accordance with NTL No. 2007-G03.

There are no other IPFs (emissions, e ffluents, physical disturbances to the seafloor, or wastes sent to shore for treatment or disposal) from the pr oposed activities which could impact wetlands.Repsol E&P USA Inc. Page O

- 14 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) 3. Shore Birds and Coastal Nesting Birds
Accidents: Oil spills could cause impacts to shore birds and coastal nesting birds. However, it is unlikely that an oil spill would occur from the proposed ac tivities (refer to Item 5 , Water Quality). Given the distance from shore (170.4 miles) and the response capabilit ies that would be implemented, no impacts are expected. The activities proposed in this plan will be c overed by Repsol’s Regional OSRP (refer to information submitted in Appendix H ).

Discarded trash and debris: Coastal and marine birds are highl y susceptible to entanglement in floating, submerged, and beached marine debris: speci fically plastics. Operat ors are prohibited from deliberately discharging debris as mandated by MARPOL-Annex V and the Marine Plastic Pollution Research and Control Act, and regulations impose d by various agencies including the United States Coast Guard (USCG) and the Environmental Protec tion Agency (EPA). Repsol will operate in accordance with the regulations and also avoid acci dental loss of solid waste items by maintaining waste management plans, manifesting trash sent to shore, and using special precautions such as covering outside trash bins to prevent accidental lo ss of solid waste. Special caution will be exercised when handling and disposing of small items and pack aging materials, particularly those made of nonbiodegradable, environmentally persistent materials such as plastic or glass.

Informational placards will be posted on vessels and every facility that has sleeping or food preparation capabilities. All offshore personnel, including c ontractors and other support servicesrelated personnel (e.g. helicopter pilots, vessel captain s and boat crews) will be indoctrinated on waste procedures, and will view the video (or Microsoft PowerPoint presentation), “Think About It” ( previously “All Washed Up: The Beach Litter Problem” ). Thereafter, all personnel will view the marine trash and debris training video annually. Offshore personnel wi ll also receive an explanation from Repsol management or the designated l ease operator management that emphasizes their commitment to waste management in accordance with NTL No. 2007-G03.

There are no other IPFs (emissions, e ffluents, physical disturbances to the seafloor, or wastes sent to shore for treatment or disposal) from the proposed activities that could cause impacts to shore birds and coastal nesting birds.

4. Coastal Wildlife Refuges
Accidents: An accidental oil spill from the proposed act ivities could cause impacts to coastal wildlife refuges. However, it is unlikely th at an oil spill would occur from th e proposed activities (refer to Item 5, Water Quality). Due to the distance from shor e (170.4 miles) and the re sponse capabilities that would be implemented, no impacts are expected. The activities proposed in this plan will be covered by Repsol’s Regional OSRP (refer to information submitted in Appendix H ).

Discarded trash and debris: Operators are prohibited from de liberately discharging debris as mandated by MARPOL-Annex V, the Marine Plas tic Pollution Research and Control Act and regulations imposed by various ag encies including the United States Coast Guard (USCG) and the Environmental Protection Agency (EPA). Repsol will operate in accordance with the regulations and also avoid accidental loss of so lid waste items by maintaining waste management plans, manifestingRepsol E&P USA Inc. Page O

- 15 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) trash sent to shore, and using special precautions such as covering outside trash bins to prevent accidental loss of solid waste. Special caution will be exercised when handli ng and disposing of small items and packaging materials, particularly t hose made of non-biodegradable, environmentally persistent materials such as plastic or glass.

Informational placards will be posted on vessels and every facility that has sleeping or food preparation capabilities. All offshore personnel, including c ontractors and other support servicesrelated personnel (e.g. helicopter pilots, vessel captain s and boat crews) will be indoctrinated on waste procedures, and will view the video (or Microsoft PowerPoint presentation), “Think About It” ( previously “All Washed Up: The Beach Litter Problem” ). Thereafter, all personnel will view the marine trash and debris training video annually. Offshore personnel wi ll also receive an explanation from Repsol management or the designated l ease operator management that emphasizes their commitment to waste management in accordance with NTL No. 2007-G03.

There are no other IPFs (emissions, e ffluents, physical disturbances to the seafloor, or wastes sent to shore for treatment or disposal) from the proposed activities that could cause impacts to coastal wildlife refuges.

5. Wilderness Areas
Accidents: An accidental oil spill from the proposed activities could cause impacts to wilderness areas. However, it is unlikely that an oil spill would occur from the proposed activiti es (refer to Item 5

, Water Quality). Due to the distance from the neares t designated Wilderness Area (235 miles) and the response capabilities that would be implemented, no significant adverse impacts are expected. The activities proposed in this plan will be covere d by Repsol’s Regional OSRP (refer to information submitted in Appendix H).

Discarded trash and debris: Operators are prohibited from de liberately discharging debris as mandated by MARPOL-Annex V, the Marine Plas tic Pollution Research and Control Act and regulations imposed by various ag encies including the United States Coast Guard (USCG) and the Environmental Protection Agency (EPA). Repsol will operate in accordance with the regulations and also avoid accidental loss of so lid waste items by maintaining waste management plans, manifesting trash sent to shore, and using special precautions such as covering outside trash bins to prevent accidental loss of solid waste. Special caution will be exercised when handli ng and disposing of small items and packaging materials, particularly t hose made of non-biodegradable, environmentally persistent materials such as plastic or glass.

Informational placards will be posted on vessels and every facility that has sleeping or food preparation capabilities. All offshore personnel, including c ontractors and other support servicesrelated personnel (e.g. helicopter pilots, vessel captain s and boat crews) will be indoctrinated on waste procedures, and will view the video (or Microsoft PowerPoint presentation), “Think About It” ( previously “All Washed Up: The Beach Litter Problem” ). Thereafter, all personnel will view the marine trash and debris training video annually. Offshore personnel wi ll also receive an explanationRepsol E&P USA Inc. Page O

- 16 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) from Repsol management or the designated l ease operator management that emphasizes their commitment to waste management in accordance with NTL No. 2007-G03.

There are no other IPFs (emissions, e ffluents, physical disturbances to the seafloor, or wastes sent to shore for treatment or disposal) fro m the proposed activities that could cause impacts to wilderness

areas.

6. Other Environmental Resources Identified
There are no other environmental resources identified for this impact assessment.

(C) IMPACTS ON PROPOSED ACTIVITIES The site–specific environmental conditions have been taken into account for th e proposed activities. No impacts are expected on the proposed activit ies from site-specific environmental conditions.

(D) ENVIRONMENTAL HAZARDS During the hurricane season, June through December, the Gulf of Mexico is impacted by an average of ten tropical storms (39-73 mph wind s), of which six become hurricanes ( > 74 mph winds). Due to its location in the gulf, Walker Ridge Block 365 may e xperience hurricane and tropical storm force winds, and related sea currents. These factors can adversel y impact the integrity of the operations covered by this plan. A significant storm may present physical hazards to operators and vessels, damage exploration or production equipment, or result in the release of hazardous materials (including hydrocarbons). Additionally, the displacement of equi pment may disrupt the local benthic habitat and pose a threat to local species.

The following preventative measures included in this plan may be implemented to mitigate these impacts:

1. Drilling & completion

a. Secure well b. Secure rig / platform

c. Evacuate personnel

Drilling activities will be conducted in acco rdance with NTL No.’s 2008-G09, 2009-G10, and 2010- N10.

2. Structure Installation Operator will not conduct structure instal lation operations duri ng Tropical Storm or Hurricane threat.

(E) ALTERNATIVES No alternatives to the proposed activities were cons idered to reduce environmental impacts.Repsol E&P USA Inc. Page O

- 17 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) (F) MITIGATION MEASURES No mitigation measures other than those required by regulation will be employed to avoid, diminish, or eliminate potential impacts on environmental resources.

(G) CONSULTATION No agencies or persons were co nsulted regarding potential impact s associated w ith the proposed activities. Therefore, a list of such entities has not been provided.

(H) PREPARER(S)

Evan Connolly J. Connor Consulting, Inc. 16225 Park Ten Place, Suite 700 Houston, TX 77084 (281) 578-3388 Evan.connolly@jccteam.com

(I) REFERENCES
Authors:

American Petroleum Institute (API). 1989. Effects of offshore petroleum ope rations on cold water marine mammals: a literature re view. Washington, DC: American Petroleum Institute. 385 pp.

Balazs, G.H. 1985. Impact of ocean debris on marine turtles: entanglement and ingestion. In: Shomura, R.S. and H.O. Yoshida, eds. Proceedings, Workshop on the Fate and Impact of Marine Debris, 26- 29 December 1984, Honolulu, HI. U.S. Dept . of Commerce. NOAA Tech. Memo. NOAA-TMNMFS-SWFC-54. Pp 387-429.

Burke, C.J. and J.A. Veil. 1995. Potential benefits from regulatory consideration of synthetic drilling muds. Environmental Assessment Division, Ar gonne National Laboratory, ANL/EAD/TM-43.

Daly, J.M. 1997. Controlling the discharge of syntheti c-based drilling fluid contaminated cuttings in waters of the United States. U.S. Environmental Protection Agency, Office of Water. Work Plan, June 24, 1997.

Hansen, D.J. 198l. The relative sensitivity of seabir d populations in Alaska to oil pollution. U.S. Dept. of the Interior, Bureau of Land Management, Alaska OCS Region, Anc horage. BLM-YK-ES-81- 006-1792.Repsol E&P USA Inc. Page O

- 18 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) Laist, D.W. 1997. Impacts of marine debris: entanglem ent of marine life in marine debris including a comprehensive list of species with entanglement a nd ingestion records. In : Coe, J.M. and D.B. Rogers, eds. Marine debris: sources, impacts, and solutions. New Yor k, NY: Springer-Verlag. Pp. 99-139.

Majors, A.P. and A.C. Myrick, Jr. 1990. Effects of noi se on animals: implications for dolphins exposed to seal bombs in the eastern tropical Pacific purse-seine fishery–an annotated bibliography. NOAA Administrative Report LJ-90-06.

Marine Mammal Commission. 1999. A nnual report to Congress – 1998.

Piatt, J.F., C.J. Lensink, W. Butler, M. Ke ndziorek, and D.R. Nysewande r. 1990. Immediate impact of the Exxon Valdez oil spill on marine birds. The Auk. 107 (2): 387-397.

Vauk , G., E. Hartwig, B. Reineking, and E. Vauk- Hentzelt. 1989. Losses of seabirds by oil pollution at the German North Sea coast. Topics in Marine Biology. Ros, J.D, ed. Scient. Mar. 53 (2-3): 749- 754.

Vermeer, K. and R. Vermeer, 1975 Oil threat to bi rds on the Canadian west coast. The Canadian Field-Naturalist. 89:278-298.

Although not cited, the following were utilized in prepar ing this EIA: Hazard Surveys
BOEM EIS’s: GOM Deepwater Operations and Activities. Environmental Assessment. BOEM 2000-001 GOM Central and Western Planning Areas Sa les 166 and 168 Final Environmental Impact Statement. BOEM 96-0058.Repsol E&P USA Inc. Page P

- 1 Initial Exploration Plan December, 2011 Walker Ridge Block 365 (OCS-G 33967) APPENDIX P ADMINISTRATIVE INFORMATION

(A) EXEMPTED INFORMATION DESCRIPTION The proposed bottom-hole locations of the planne d wells have been removed from the public information copy of the EP as well as any discussions of the target objectives, geologic or geophysical data, and any interpreted geology.

(B) BIBLIOGRAPHY Not applicable.