# SECTION 10: ENVIRONMENTAL MONITORING INFORMATION

A. Monitoring Systems

A rig based Acoustic Doppler Current Profiler (ADCP) is used to continuously monitor the current beneath the Rig. Metocean conditions such as sea states, wind speed, ocean currents, etc. will also be continuously monitored

B. Incidental Takes

No incidental takes are anticipated. Shell implements the mitigation measures and monitors for incidental takes of protected species according to the following notices to lessees and operators from the Minerals Management Service:

NTL No.20 12

- G0 1 “Mari ne Trash and Debris Awareness and Elimination” NTL No.20 12

- Joint

- G0 1 “Vessel Strike Avoidance and Injured/Dead Protected Species Reporting”

C. Flower Garden Banks National Marine Sanctuary

The operations proposed in this DOCD will not be conducted within the Protective Zones of the Flower Garden Banks and Stetson Bank.

SECTION 11: LEASE STIPULATIONS INFORMATION

Lease OCS

- G 7963 was part of Lease Sale No. 98 on May 22, 1985. This lease is part of the M ississippi Canyon Block 807 Unit; Unit Contract No. 754393002 approved effective 8/1/92. Unit Agreement consists of Leases OCS

- G 7957 (SE1/4), 7958 (S1/2), 7962 (E1/2), 7963, 9881 (NE1/4), and 9882 (N1/2). The Unit has been held by production. Shell is designated operator of the Unit. The U nit Leases are not part of a b i ological sensitive area, known c hemosyntheti c a rea, shipping f airway or Military Warning Area

.

Lease OCS

- G 24112 was part of Lease Sale #812 on March 20, 2002. This lease is not located in a biological sensitive a rea , known c hemosyntheti c a rea , shipping f airway, or Military Warning Area. It is designated as having a high potential for containing archeological properties and is located within 200 kilometers of the Breton Wilderness Area.

SECTION 12 : ENVIRONMENTAL MITIG ATION MEASURE INFORMATION

A. Impacts to Marine and coastal environments

The proposed action will implement mitigation measures required by laws and regulations, including all applicable Federal & State requirements concerning air emissions, discharges to water, and solid waste disposal, as well as any additional permit requirements and Shell policies. Project activities will be conducted in accordance with the Regional Oil Spill Response Plan. The EIA attached as Section 18 to this plan discusses impacts and mitigation measures.

# B. Incidental Takes

We do not anticipate any incidental takes related to the proposed operations. Shell implements the mitigation measures and monitors for incidental takes of protected species according to the following notices to lessees and operators from the Minerals Management Service:

NTL No. 2012

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

- Joint

- G01 “Vessel Strike Avoidance and Injured/Dead Protected Species R eporting”

# SECTION 13: RELATED FACILITIES AND OPERATIONS INFORMATION

The Mars B project is a joint venture operated by Shell Offshore Inc. The partner in the development is British Petroleum. Mars B includes the Olympus tension leg platform (TLP) and the West Boreas/South Deimos subse a development.

The Olympus TLP host will have twenty four direct vertical access (DVA) slots. DVA wells will be tied back to the host via top

- tensioned risers (TTRs).

The West Boreas development will be comprise d of six subsea wells. The wells will be tied

- in via a looped 8” dual wet

- insulated flowline system to the Olympus TLP, approximately 3.5 miles away from the subsea manifold. The produced fluids will be processed and commingled with the Mars B DVA well fluids prior to exporting the oil and gas vi a export pipelines. Subsea wells will be controlled from the Olympus platform via an electro

- hydraulic umbilical.

This Developments Operations Coordination Document (DOCD) is specifically for the Olympus TLP installation , the installation of subsea equipm ent located at the West Boreas/South Deimos site, the batch setting of 24 DVA wells with a semi

- submersible rig, and the production of 6 wells at the subsea site that will be drilled with a semi

- submersible rig. Subsequent DVA wells will be drilled to tot al depth with the DVA rig that is to be installed on the TLP.

The Olympus TLP will be located in Mississippi Canyon Block 807 in the Central Gulf of Mexico. The facility is located approximately 130 miles southeast of New Orleans, Louisiana in approxima tely 3100 feet of water. The selected development concept is a tension leg platform with complete processing capabilities, including oil and gas separation, oil conditioning, gas dehydration, and produced water treating. The TLP will be equipped with a p latform drilling rig capable of drilling, completing and performing workover/maintenance activities on the 24 DVA wells.

The execution phase of the Olympus TLP and West Boreas/South Deimos facilities will consist of batch setting 24 DVA wells directly un der the TLP location by a semi

- submersible rig. Batch setting consist of
pre

- drilling and installing the 36” structural pipe, 32” casing, 28” casing, and 22” surface casing for these wells. Once the batch set is completed, the TLP hull and its tendons mooring components will be installed. The subsea manifolds, umbillicals, and jumpers will be installed as well as export risers & flowlines. Once final topsides commissioning activities are completed, the initial West Boreas/South Deimos well will initiat e oil production to the facility.

Attached Figure 13

- 1 is a diagram of Pha s e I, 13

- 2 is an overhear view of the Phase I installation & 13

- 3 is a diagram of the entire project (Phase I & Phase II).

Pipelines proposed in Section 1a :

Size Length Route Product Shut

- in Time in the event of a leak 8.625” (2) 18000‟ MC 762

- MC 807 Crude 45 seconds 6.625 (8) 100‟ MC 762

- MC 762 Crude 45 seconds

# Transportation System :

Oil Export

The Olympus oil export line will consist of a 16

- inch steel catenary riser and a 16

- inch/18

- inch pipeline. The oil export line will be 40 miles long and end with a rigid riser at WD143C.

The oil export pipeline and riser will be designed in accordance w ith ANSI B31.4 for a Maximum Allowable Operating Pressure of 2500 psig and a Maximum Allowable Operating Temperature of 140° F.

Gas Export

The Olympus gas export line will consist of a 16

- inch steel catenary riser and 16

- inch pipeline. The gas export line will be 40 miles long and end with a rigid riser at WD143C.

The gas export pipeline and riser will be designed in accordance with ANSI B31.8 for a Maximum Allowable Operating Pressure of 2220 psig and a Maximum Allowable Operating Temperature of 140 ° F.

Two lines will be departing WD143C and will tie in subsea to a 30" gas line going to Venice and to a 24" line going to Clovelly.

Produced liquid hydrocarbons transportation vessels : None

# SECTION 14: SUPPORT VESSELS AND AIRCRAFT INFORMATION

A. General

Type Maximum Fuel Tank

Storage Capacity (Gals) Maximum No. In Area at Any Time Trip Frequency or Duration

Crew Boats 8,000 2 2 per week Offshore Support Vessels 120,000 2 2 per week Helicopter 764 1 Once per day

B. Diesel Oil Supply Vessels

Size of Fuel Supply Vessel Capacity of Fuel

Supply Vessel (Gallons) Frequency of Fuel Transfers Route Fuel Supply Vessel Will Take

280 foot length 135,000 1 week Port Fourchon to MC 807

C. Drilling Fluids Transportation This information is only required for operations offshore Florida.

D. Solid and Liquid Wastes Transportation

See Section 7, Tables 7A & 7B for this information.

E. Vicinity Map See a ttachment 14A.

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N a u t i c a l M i l e s

# S ECTION 15 : ONSHORE SUPPORT FACILITIES

A. General

The onshore support bases for water and air transportation will be the existing terminals in Boothville and Fouchon , Louisiana

. The Fouchon boat facility is operated by SOI and is located on Bayou LaFourche, south of Leeville, LA approximately 3 miles from the Gulf of Mexico. The Boothville heliport is operated by PHI and is located at 38963 La State Highway 23 in Boothville, L A.

Name Location Existing/New/Modified

Fourchon Port Fourchon, LA Existing
Boothville PHI Heliport Boothville, LA Existing

B. Support Base Construction or Expansion

The activities in the p lan will not cause construction or expansion to existing base

.

C. Support Base Construction or Expansion Timetable

The activities in the plan will not cause construction or expansion to existing base

.

D. Waste Disposal

See Section 7, Tables 7A and 7B.

SECTION 16 : SULPHUR OPERATIONS

T his p lan does not include Sulphur Operations.

# SECTION 17 : COASTAL ZONE MANAGEMENT ACT (CZMA) INFORMATION

LOUISIANA COASTAL ZONE MANAGEMENT CONSISTENCY CERTIFICATION

Development Operations Coordination Document

Type of Plan

OCS

- G 07957
, Mississippi Canyon Block 762 OCS

- G 07958
, Mississippi Canyon Block 763 OCS

- G 24112
, Mississippi Canyon Block 805 OCS

- G 07962
, Mississippi Canyon Block 806 OCS

- G 07963
, Mississippi Canyon Block 807

Offshore Louisiana Lease Number, Area & Block

The proposed activities described in detail in this Plan will comply with Louisiana's State and Local Coastal Resources Management Act of 1978, Coastal Resources Program, and Coastal Area Management Enforceable Policies.

We have considered all of Louisia na's Enforceable Policies in making this certification of consistency.



# SHELL OFFSHORE INC. Operator

_____________________________________________ Sylvia A. Bellone Certifying Official

0 2 / 0 2 /201 2 Date