SOUND FLEET FACTS: SUSTAINED COMMITMENT, INCREASING CAPABILITIES

SERVS MISSION To maintain a constant state of readiness to assist tankers in the safe navigation through Prince William Sound, and to provide oil spill response services to the TAPS Marine Oil Shippers, Valdez Marine Terminal and Pipeline in accordance with oil spill response agreements and plans.

Introduction to the Marine Service Contract Transition Alyeska Pipeline Service Company s (Alyeska) marine service provider is transitioning from Crowley Marine Services (Crowley) to Edison Chouest Offshore (ECO) on July 1, 2018. Alyeska has dedicated substantial resources to successfully manage this transition in partnership with Crowley, ECO and key stakeholders. Our commitment to protect the pristine environment of Port Valdez and Prince William Sound through this transition and beyond remains paramount. ECO Vessels Constructed for SERVS Fleet: Four new general purpose tugs Five new escort tugs One utility tug (already in ECO fleet) Four new oil spill response barges This state-of-the-art fleet brings new power and flexibility to SERVS operations. Added horsepower will help escort tugs assist tankers more effectively, stopping them faster and guiding them back on course if needed. New winches will make towing and tether escort operations safer and more effective. Identical, interchangeable vessel design will increase the reliability of escort and general purpose tug work. This will also improve crew vessel familiarization, operations and maintenance rotation and repairs. SOUND FLEET FACTS 2

Transition Objectives Flawless operational, safety and environmental performance New ECO vessels meet specifications Full compliance with regulatory requirements Proactive and productive regulator and stakeholder engagement Full understanding and integration of ECO with Alyeska culture Develop personnel knowledge, skills, qualifications and training Vessel construction is only one piece of the transition. ECO and Alyeska staff will execute a training plan that ensures new personnel are skilled at tug operations and familiar with Prince William Sound and SERVS operations. Crews will train in ECO s 35,000-square-foot facility in Louisiana before receiving additional training in Alaska. SOUND FLEET FACTS 4

ESCORT TUG SERVS provides two escort tugboats to every laden tanker that sails through Prince William Sound. During the escort, one of these tugs is tethered to laden tankers from the Valdez Marine Terminal, through the Valdez Narrows, to Buoy #9 beyond the Narrows. The tugs maintain a minimum distance of a quarter-mile when performing their escort duties, ensuring that every tanker remains within visual sight and easy range for response. The escort vessels must be able to steer the tanker, counter any undesired deviation in course and take the tanker under tow. They are critical components of oil spill prevention in Prince William Sound. Escort Tug Particulars LOA 140.38 (42.79m) Beam OA 54.13 (16.50m) Depth (hull + skeg) 31.82 (9.70m) ALYESKA PIPELINE SERVICE COMPANY

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Escort Tug Description Two CAT C280-16 diesel engines (Tier IV) 6,168 HP @ 900 RPM (12,336 HP) Two Rolls Royce Azimuth stern drives 4,000mm diameter controllable pitch propellers High performance Kort nozzles Constant tension winches Escort Tug Performance Free running speed 14.0 knots Expected 15.2 knots ahead Bollard pull 136.1MT (300,000#) forward Capable of towing a light barge in excess of 10 knots Other Features Oil detection equipment Bunk space for 12 Dispersant systems on two escort tugs FFVI firefighting capabilities Infrared camera system SOUND FLEET FACTS 6

GENERAL PURPOSE TUG The general purpose tugs will replace several docking tugs currently in the fleet. They will dock tankers coming into the Valdez Marine Terminal and tow response barges, support equipment deployments and perform other marine operations as needed. General Purpose Tug Particulars LOA 102-6 (31.25m) Beam 42-8 (13.0m) Depth (hull + skeg) 24 9 (7.55m) General Purpose Tug Description Two Caterpillar 3516E (HD) diesel engines (Tier IV) 3,004 HP @ 1800 RPM each (6,008 HP) Two Rolls Royce Azimuth stern drives 2600mm diameter fixed pitch propellers High performance Kort nozzles Constant tension winches ALYESKA PIPELINE SERVICE COMPANY

General Purpose Tug Performance Free running speed 12.0 knots ahead Bollard pull 65.8MT (145,000#) forward Capable of towing a barge in excess of 10 kts Other Features Oil detection equipment Firefighting capabilities on two general purpose tugs Bunk space for 12 SOUND FLEET FACTS 8

UTILITY TUG The utility tug performs mooring maintenance, supports fishing vessel training and performs a host of other duties. The utility tug, the M/V Ross Chouest, is already constructed and active in ECO s fleet. Utility Tug Particulars LOA 256 6 (78.20m) Beam 54 (16.46m) Draft (Load Line) 18 0 (5.49m) Utility Tug Description Two 3612 Caterpillar Diesel Engines 5,700 HP @ 1000 RPM each (11,400 HP) Two 3400mm diameter controllable pitch propellers in nozzles Utility Tug Performance Speed @ max draft: 12.5 knots Bollard pull @ max draft: 125 Mt (275,000#) forward Other Features Anchor handler Bunk space for 39 Deck crane SOUND FLEET FACTS 10

OIL SPILL RESPONSE BARGE In addition to the new tugs, ECO is also designing and building new open-water oil spill response barges for operation in Prince William Sound. They will replace existing converted storage barges and bring new skimming technology and a safer deck configuration. Barge Particulars LOA 400 Beam 96 Depth (hull) 28 Capacity -114,000Bbls @ 0.97sg & 95% tank fill Crucial disk skimming systems Most piping below deck for crew safety SOLAS rescue boat Living accommodations for 12 ALYESKA PIPELINE SERVICE COMPANY

SOUND FLEET FACTS 12

VESSEL COMPARISON: CURRENT FLEET VS. ECO NEW-BUILD TUGS Vessel Class Length (feet) Beam (feet) Horsepower General Purpose Current General Purpose/ Docking Tugs 136 36 5,750-7,200 ECO General Purpose Tugs 102.53 42.65 6,008 Current Escort Tug: Enhanced Tractor Tug 153 48 10,192 Escort Current Escort Tug: Prevention and Response 140 42 10,192 ECO Escort Tug 140 54 12,336 Utility Current Utility Tug 207 40 5,700 ECO Utility Tug 256 54 11,400 VESSEL IMPROVEMENTS: Forward skeg: A skeg is a large keel that allows the tug to create drag through the water, which increases bollard pull when the tug turns sideways. This is a way escort tugs can stop a tanker traveling at higher speeds. Azimuthing drives with Kort nozzles: These drives incorporate the propellers and rotate 360 degrees, adding additional maneuverability. Kort nozzles increase thrust provided by the propellers. Direct bollard pull: The force created by an escort tug pulling directly on an object or tanker using propellers only. ALYESKA PIPELINE SERVICE COMPANY

Hull Enhancement Drive Style Bollard Pull (pounds) Towing Winches Escort None Conventional 105K-150K Conventional N/A Forward skeg Azimuthing-drive w/ Kort nozzle 145K Conventional Constant tension Aft skeg Voith-Schneider Cycloidal Direct: 208K Dynamic: 420K at 12 kts N/A Conventional None Azimuthing-drive w/ Kort nozzle Direct: 300K Dynamic: no rating Conventional Conventional Forward skeg Azimuthing-drive w/ Kort nozzle Direct: >300K by contract Dynamic: 434K at 8 kts Constant tension Constant tension None None Conventional w/ Kort nozzles Conventional w/ Kort nozzles 160K Conventional N/A 275K Conventional N/A Dynamic/indirect bollard pull: The forces created when a tug is tethered behind a tanker and turns 90 degrees, creating the additional resistance needed to stop or turn a tanker. This tactic works best when tankers are traveling at higher speeds. In the current fleet, two escort tugs have the ability to create dynamic bollard pull and three tugs have a superior direct bollard pull. All the escort tugs in the incoming fleet have both capabilities, and at a higher level of performance. Conventional winch: This winch s towline is held steady by a brake and doesn t adjust as the tug and tanker move; it can be loose or taut, depending on where the two vessels are on a wave. Constant tension winch : This winch s towline is held constant by a set tension and will automatically take in or let out a line as the tug and tanker move. This ability enhances the safety and performance of the escort tug. SOUND FLEET FACTS 14