NATIONAL RESPONSE CENTER 1-800-424-8802 *** For Public Use *** Information released to a third party shall comply with any applicable federal and/or state Freedom of Information and Privacy Laws Incident Report # 780748 INCIDENT DESCRIPTION *Report taken at 10:51 on 28-NOV-05

Incident Type: PLATFORM

Incident Cause: EQUIPMENT FAILURE Affected Area: GULF OF MEXICO

The incident occurred on 23-NOV-05 at 19:30 local time.

Affected Medium: WATER   / GULF OF MEXICO

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SUSPECTED RESPONSIBLE PARTY

Organization:         BP EXPLORATION & PRODUCTION, INC

HOUSTON, TX 77079

Type of Organization: PRIVATE ENTERPRISE

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INCIDENT LOCATION

County: MISSISSIPPI CANYON State: LA Latitude: 29 Degrees ' " N

Longitude: 88 Degrees ' " W PLATFORM INCIDENT

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RELEASED MATERIAL(S)

CHRIS Code: NCC    Official Material Name: NO CHRIS CODE

Also Known As:  SYNTHETIC BASED DRILLING FLUID (MUD)

Qty Released: 286 BARREL(S)           Qty in Water: 286 BARREL(S)

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DESCRIPTION OF INCIDENT

WHILE DRILLING THE MC 126 #4 WELL WITH THE TRANSOCEAN DEEPWATER HORIZON DRILLING  RIG, 286 BBLS OF SYNTHETIC-BASED DRILLING FLUID WAS RELEASED TO THE SEAFLOOR, AT A  WATER DEPTH OF 4,600 FT.  NO SHEEN WAS OBSERVED ON THE SURFACE OF THE SEA.  THIS  RELEASE OF DRILLING FLUID WAS SUBSEQUENT TO THE RELEASE ESTIMATED TO HAVE BEEN UP  TO 59 BBLS OF SYNTHETIC-BASED DRILLING FLUID RELEASED THE PREVIOUS DAY (NRC CASE  NUMBER 780340).

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INCIDENT DETAILS

Platform Rig Name: TRANSOCEAN DEEPWATER HORIZON Platform Letter: Location Area ID: MISSISSIPPI CANYON Location Block ID: 126 OCSG Number: OCSP Number: State Lease Number: Pier Dock Number: Berth Slip Number:

---WATER INFORMATION--- Body of Water: GULF OF MEXICO Tributary of: Nearest River Mile Marker: Water Supply Contaminated: NO

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DAMAGES

Fire Involved: NO   Fire Extinguished: UNKNOWN

INJURIES:

NO

Hospitalized:

Empl/Crew:

Passenger:

FATALITIES:

NO

Empl/Crew:

Passenger:

Occupant:

EVACUATIONS:

NO

Who Evacuated:

Radius/Area:

Damages:

NO

Length of

Direction of

Closure Type

Description of Closure

Closure

Closure

Air:

N

Road:

N

Major  Artery:

N

Waterway:

N

Track:

N

Passengers Transferred: NO

Environmental Impact: UNKNOWN

Media Interest: NONE  Community Impact due to Material: NO

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REMEDIAL ACTIONS

THE VOLUME OF DRILLING FLUID RELEASED WAS REDUCED DUE TO THE UTILIZATION OF A UNIQUE PLUG THAT MINIMIZED THE VOLUME OF DISPLACED FLUID. THE PLUG DESIGN WAS REVIEWED AND APPROVED BY THE MMS FOR THIS OPERATION.

Release Secured: UNKNOWN Release Rate: Estimated Release Duration:

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WEATHER

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ADDITIONAL AGENCIES NOTIFIED

Federal:

State/Local:

State/Local On Scene:

State Agency Number:

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NOTIFICATIONS BY NRC

DOT CRISIS MANAGEMENT CENTER (PRIMARY)

28-NOV-05

11:05

USCG FIST NEW ORLEANS (SUPERVISOR, FIST NEW ORLEANS)

28-NOV-05

11:05

GULF STRIKE TEAM (PRIMARY)

28-NOV-05

11:11

LA DEPT OF ENV QUAL (PRIMARY)

28-NOV-05

11:05

LA OFFICE OF EMERGENCY PREPAREDNESS (PRIMARY)

28-NOV-05

11:05

LA OFFICE OF GOV ATTN ROLAND GUIDRY (PRIMARY)

28-NOV-05

11:05

LA OFFICE OF PUBLIC HEALTH (PRIMARY)

28-NOV-05

11:05

MSO MORGAN CITY (PRIMARY)

28-NOV-05

11:11

NATIONAL INFRASTRUCTURE COORD CTR (PRIMARY)

28-NOV-05

11:05

NOAA 1ST CLASS BB RPTS FOR LA (PRIMARY)

28-NOV-05

11:05

LA STATE POLICE (PRIMARY)

28-NOV-05

11:05

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ADDITIONAL INFORMATION

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*** END INCIDENT REPORT #

780748

***