February 27, 2008 – Kerr-McGee Oil & Gas Corporation

Remarks: During completion activities on the semisubmersible drilling rig Diamond Ocean Valiant (built in 1989), calcium chloride completion fluid was being pumped from the mud pits to the liquid storage leg. Approximately 682 barrels of calcium chloride (CaCl2) were released through the dump valve and discharged into the water due to a valve that was inadvertently left in open position.

NRC Reports: 863653 & 863655

March 19, 2008 – Newfield Exploration Company

Pollution:	131.3 bbl	Crude Oil/ Condensate:	None
Refined Petroleum:	None	Synthetic Oil Fluids*:	131.3 bbl           Synthetic Base Fluids in 217 bbl of 60.5% SBM
Chemicals:	None	Event:	Pollution
MMS Investigation Report:	Accident Incident Report Only	Activity:	Exploration
Lease:	G018292	Operation:	Drilling
Area:	Mississippi Canyon	Causes:	Equipment Failure
Block:	800	Distance to Shore:	50 miles
Rig:	Diamond Ocean Quest	Water Depth:	3,116 Feet

Remarks: Seas of 18-22 feet caused the riser boost line on the semisubmersible drilling rig Diamond Ocean Quest (built in 1972 and refurbished in 1996) to break at riser connection below rig. Concurrently, a compensator hose gave way and repairs were being made to that before it was noticed that the boast line had failed. 217 bbls of mud were lost before pump was shut off. The check valve in the riser held and the rig was shut down due to weather, extreme heave. Once weather permitted, drilling was able to resume without repairing the broken riser boost line. The boost line repair was delayed until conditions were safe to do so. Approximately 217 bbl of 60.5% synthetic-based mud (SBM) were lost to the Gulf of Mexico. It is estimated that the lost SBM contained approximately 131.3 barrels of synthetic base fluids.

NRC Report: 865423

March 21, 2008 – Shell Offshore Inc.

Remarks: On March 21, 2008, at 1105 hours, on Shell Offshore Inc.'s, Right of Way (ROW) OCS-G 15988, West Delta Block 143 A-Process 4-pile fixed platform with skirts installed in Federal waters in 1990, an employee was injured while investigating a glycol leak. The Injured Person (IP) observed glycol leaking from a 1" line approximately 8' above the deck. The IP used a step ladder to access the area and began removing insulation to expose the leak. At that point, a 1" valve on the leaking glycol line came free exposing the IP to the hot glycol. The IP jumped off of the ladder, in an attempt to escape the hot glycol and suffered a broken ankle and 1st and 2nd degree burns to his upper body. The operator did not isolate or shut-in and bleed down the unit before investigating the leak. The IP was not wearing the proper Personal Protective Equipment (PPE) when exposing hot surfaces to avoid burns.

As a result of the incident, 70 bbls of monoethylene glycol (MEG) was spilled into the Gulf of Mexico. The Glycol Regeneration Unit (GRU) was shut down and barricaded. The valve was sent to Shell's Westhollow Research Center for analysis. Initial findings suggest corrosion due to high pH from caustics introduced into the system.

The primary causes of this incident were external corrosion on MEG system and internal corrosion on galvanized nipple, and failure to shut-in and bleed down equipment. A contributing cause may have been due to the nipple that failed was galvanized steel not carbon. High amounts of caustic probably contributed to the corrosion of the nipple. Galvanized steel is more prone to corrosion.

Accident Investigation Report: Form 2010 21-March-2008 WD143

NRC Report: 865697

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January to March, 2008 – Wild Well Control (former BP Exploration & Production, Inc.)

Pollution:	53.7 bbl	Crude Oil/ Condensate:	53.7 bbl Crude Oil
Refined Petroleum:	None	Synthetic Oil Fluids*:	None
Chemicals:	None	Event:	Pollution
MMS Investigation Report:	Completed 19-January-2008	Activity:	Decommissioning/Salvage
Lease:	01333	Operation:	Submerged Platform
Area:	Grand Isle	Causes:	Hurricane Katrina
Block:	47	Distance to Shore:	18 Miles
Platform:	C	Water Depth:	88 Feet

Remarks: The Grand Isle 47C 8-pile fixed platform installed in Federal waters in 1957, is one of the seven BP operated platforms downed in Federal waters by Hurricane Katrina in August 2005. As part of BP's initial hurricane response, over-flights were conducted as early as September 6, 2005. In addition, an ROV vehicle was mobilized for inspection of all of BP's downed platforms on October 20, 2005. As of 2008, decommissioning and abandonment operations are being performed by Wild Well Control.

Approximately 50.6 bbl seeped from the structure between January 1 and March 31, 2008.  The Seahorse VI was kept on location and deployed an absorbent boom for skimming operations.

Accident Investigation Report:  F2010 9-January-2008 GI47

2008 NRC Report: 859213

June 6, 2008 – Murphy Exploration & Production

Remarks: On the A-Front Runner Spar platform installed in Federal waters in 2004, a dump valve was left open on storage tank allowing 180 bbl of zinc bromide to spill into the Gulf of Mexico.

NRC Report: 873341

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Hurricane Gustav/Ike Narratives

Summary of Spills Linked to Major Hurricanes, 2002 to 2008

September 27, 2008 – ATP Oil & Gas Corporation

Pollution:	1,718.0 bbl	Crude Oil/ Condensate:	None
Refined Petroleum:	None	Synthetic Oil Fluids*:	1,718 bbl           Synthetic Base Fluids in 3,123 bbl of 55% SBM
Chemicals:	None	Event:	Pollution
MMS Investigation Report:	Completed 29-June-2009	Activity:	Exploration
Lease:	G16661	Operation:	Drilling
Area:	Mississippi Canyon	Causes:	Equipment Failure
Block:	941	Distance to Shore:	65 miles
Rig:	Seadrill West Sirius	Water Depth:	4.000 Feet

Remarks:  ATP Oil and Gas reported a 3,123 bbl of 55% synthetic based mud (SBM) spill that occurred late on Saturday, Sept 27, 2008.  It is estimated that the lost SBM contained approximately 1,718.0 barrels of synthetic base fluids. The new Seadrill West Sirius semisubmersible drilling rig (built in 2008) was drilling Well #2 and began taking on 4400 bbls of mud at approximately 2130 hours.  Shortly after the transfer began a shift change took place.  When the transfer was nearly complete it was noticed that the pit gains weren't what they should be, and the level of pit # 3 was decreasing.  The mud in this pit was transferred to the others.  Investigation showed that two dump valves, one manual and one pneumatic located 60 feet below the deck in a confined space were leaking.  The mud pit dump valve did not fully close, possibly due to the accumulation of solids preventing it from seating.  The master dump valve's manual operator/position indicator was incorrect for this valve and did not allow the full opening and closing of the valve.  There was no sheen associated with this loss of SBM.

Accident Investigation Report:  Form2010 27-September-2008 MC941

NRC Report:  885454

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July to September, 2008 – Taylor Energy Company

Pollution:	72.0 bbl	Crude Oil/ Condensate:	72.0 bbl Crude Oil
Refined Petroleum:	None	Synthetic Oil Fluids*:	None
Chemicals:	None	Event:	Pollution
MMS Investigation Report:	Accident Incident Reports Only	Activity:	Decommissioning/Salvage
Lease:	01333	Operation:	Submerged Platform
Area:	Mississippi Canyon	Causes:	Hurricane Katrina
Block:	20	Distance to Shore:	19 Miles
Platform:	A	Water Depth:	479 Feet

Remarks: The Mississippi Canyon 20 A 8-pile fixed platform installed in Federal waters in 1984, was completely destroyed as a result of a mud flow incident during Hurricane Ivan in September 2004. After Hurricane Ivan, the platform was found to be lying on its side, submerged nearly 75% below the mudline, approximately 800 feet from its original location.  Estimates for cleanup operations have ranged up to $500 million (Taylor 2007).

As of June 2009, decommissioning and abandonment operations at MC 20 A are the last activity for Taylor Energy which sold and transferred all its other GOM properties to Ankor Energy in 2009.

Approximately 72.0 bbl seeped from the structure between July 1 to September 30, 2008.  Three pollution domes were installed over three distinct plumes in May 2009.

NRC Report:   876336

December 3, 2008 – Mariner Energy, Inc. & Rowan Drilling

Pollution:	70.0 bbl	Crude Oil/ Condensate:	None
Refined Petroleum:	None	Synthetic Oil Fluids*:	None
Chemicals:	70.0 bbl Completion Fluids	Event:	Pollution
MMS Investigation Report:	2010 Completed       27-January-2009	Activity:	Development/Production
Lease:	G02592	Operation:	Completion
Area:	South Marsh	Causes:	Equipment Failure
Block:	149	Distance to Shore:	74 miles
Rig:	Rowan J.P. Bussell	Water Depth:	234 Feet

Remarks: While utilizing the Rowan J.P. Bussell jack-up rig (built in 2005), approximately 33 barrels (bbl) of Zinc Bromide (ZnBr2) and approximately 37 BBLs of a weighted blend of Calcium Bromide (CaBr2) and Calcium Chloride (CaCl2) was released into the Gulf of Mexico, resulting from an upset condition during completion operations for Well D-1.   The faulty (leaking) new butterfly valve #2, located on the suction line manifold, resulted in the undesired flow of completion fluid into the GOM through the open pre-load tank #39. It is unclear from the investigation what exactly caused the failure of valve #2. According to the Offshore Installation Manager, the entire system is new, but this particular valve may have been damaged due to weathering and inactivity since installation.

Accident Investigation Report: Form2010 3-December-2008 SM149

NRC Report:  891651   

One barrel (bbl) equals 42 U.S. gallons (gal)

Synthetic Oil Fluids*: In deepwater drilling, synthetic-based muds (SBM’s) are preferred over petroleum oil-based muds (OBM’s) due to the SBM's superior performance properties. The synthetic oils used in SBM’s are relatively non-toxic to the marine environment and have the potential to biodegrade.

60%**: Indicates that for a synthetic-based mud release, the exact percentage of volume of synthetic base oil to total volume of mud released was not available and 60% was used as a reasonable approximation.

75%***: Indicates that for an oil-based mud release, the exact percentage of volume of base oil to total volume of mud released was not available and 75% was used as a reasonable approximation. Diesel is assumed to be the base oil in OBM unless otherwise specified.