SLIDE 1 9/25/14 ¡ 1 ¡
Analysis of Crude Oil Tanker Ballast Water Data for Valdez & Prince William Sound, Alaska
Danielle Verna
PWSRCAC Board Meeting September 2014
Definitions
- Coastwise vs. Overseas
- Coastal vs. Mid Ocean
- EEZ
- BWE
- NBIC
SLIDE 2 9/25/14 ¡ 2 ¡
U.S. Ballast Water Management Policy
- Mandatory BWM reporting
- Mandatory BWM
Exemptions:
- Crude oil tankers involved in coastwise trade
- Traveling within one Captain of the Port Zone
- DOD & USCG vessels
- Vessel General Permit – Effective February 6, 2009 in AK
- Regulated Pacific nearshore voyages
- Mandatory management & record keeping for crude oil
tankers involved in coastwise trade
2004: ¡USCG ¡ 2008: ¡EPA ¡ Valdez & Prince William Sound 2005 – 2012
– Valdez: 17 – PWS: 7
- 54,642,270 MT of ballast water
– Valdez: 52,805,080 MT – PWS: 1,837,190 MT
- 97% coastwise ballast
- 28% managed
h)p://invasions.si.edu/nbic/managementpract.html ¡
SLIDE 3
9/25/14 ¡ 3 ¡
Valdez: Reported Type of Ballast Discharge
2,000,000 4,000,000 6,000,000 8,000,000 10,000,000 12,000,000 2005 2006 2007 2008 2009 2010 2011 2012 Ballast Volume (MT) Unknown Overseas Coastwise 91% ¡ 93% ¡ 99% ¡ 92% ¡ 97% ¡ 97% ¡ 98% ¡ 98% ¡
SLIDE 4
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Valdez: Reported Management of Ballast Discharge
1,000,000 2,000,000 3,000,000 4,000,000 5,000,000 6,000,000 7,000,000 8,000,000 2005 2006 2007 2008 2009 2010 2011 2012 Ballast Volume (MT) Unmanaged Managed - Mid Ocean Managed - Coastal 99% ¡ 87% ¡ 99% ¡ 97% ¡ 61% ¡ 71% ¡ 63% ¡ 66% ¡ 26% ¡ 16% ¡ 23% ¡ 20% ¡
SLIDE 5
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Valdez: Reported Management Method of Ballast Discharge
1,000,000 2,000,000 3,000,000 4,000,000 5,000,000 6,000,000 7,000,000 8,000,000 2005 2006 2007 2008 2009 2010 2011 2012 Ballast Volume (MT) Unmanaged Managed - Alternate Managed - Empty Refill Managed - Flow Through
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Prince William Sound
- Reports of ballast discharged in:
– Prince William Sound – PWS Captain of the Port Zone – Knowles Head Anchorage
- No reported ballast discharge in 2008 or 2012
- 98.6% coastwise ballast
- Increase in post-VGP management rates (0% 44%)
SLIDE 7
9/25/14 ¡ 7 ¡
Thank You
