Anchorage 9 Ship Booming Demonstration HFO 5 000

Anchorage #9 Ship Booming Demonstration HFO – 5, 000 Gallon Spill Details PISCES II - Projections

Notice • This demonstration shows how oil is predicted to travel if there is a spill in Anchorage #9. • This is a snapshot of one tidal current cycle on one day. • This demonstrates a containment strategy only using only one type of oil boom (protected waters). • This is not a quantitative analysis of the usefulness of booming strategies in general or any specific strategy in particular but rather a demonstration of what can happen to oil spilled when the ship is pre-boomed.

Model Projections Using PISCES II • Model predicts where oil will travel based on software model algorithms. The program: – Only predicts surface oil movements – Does not consider areas of drying – Is based on user input variables including: • • • Type of oil introduced Method of introduction Weather conditions Current conditions Type of booms used

Tidal Current Predictions August 28, 2010 Slack Max Current Slack 0922 1238 1. 7 Flood 1537 1843 1. 9 Ebb Wind: From the West at 10 Knots Time of Spill: 0900 2203

Oil/Boom Characteristics • Oil Characteristics (user input) – MGO • API 37. 9 – HFO • API 14. 7 • Boom Characteristics (user input - protected waters boom) – Height above water • 0. 3 meters – Depth below water • 0. 4 meters

Anchorage #9 HFO – 5, 000 Gallon Spill Results PISCES II – Projections No Boom

Scenario Time of Spill is 0900 Spill Location

Scenario Time Spill Statistics Spill Location 5, 000 Gallons HFO Instantaneous

Scenario Time Oil in the water

Scenario Time

Scenario Time Oil in the water

Scenario Time Oil in the water

Scenario Time Oil footprint

Scenario Time Oil footprint

Scenario Time Current changing direction

Scenario Time

Scenario Time

Scenario Time Oil footprint

Anchorage #9 HFO – 5, 000 Gallon Spill Results PISCES II – Projections With Boom

Scenario Time Spilled Oil HFO – 5, 000 gallons Oil boom around ship and barge Spill Statistics

Statistics on oil outside boom The first entrainment took place where the boom was alongside the barge.

Oil in the water

Oil in the water

General Observations • The protected water boom placed around the ship and barge prior to the spill appears to be ineffective at containing the oil. • The first signs of entrainment took place where the boom was alongside the barge. • By 30 minutes after the spill slightly more than half of the oil was outside the boom. • After an hour almost 90% of the oil was outside the boom.