2013 ordnance reef hi - webinar- wo prelim results
DESCRIPTION
Investigation of sea disposed munitions site and technology demonstrations. Discusses sampling strategy, numbers and types of samples collected, risk assessment approach, collaboration to minimize injury to coral, munitions recovery and treatment, current study and modeling. Preliminary results are not provided.TRANSCRIPT
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US Army Corps of Engineers BUILDING STRONG®
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US Army Corps of Engineers
BUILDING STRONG®
Office of the Deputy Assistant Secretary of the Army (Environment, Safety and
Occupational Health) &
Pacific Ocean Division, U.S. Army Corps of Engineers
22 August 2013
Ordnance Reef (HI-06) Sea Disposed Military Munitions Site Wai’anae, O’ahu, Hawai’i
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Presenters Mr. J. C. King
Director for Munitions and Chemical Matters Headquarters Department of the Army (HQDA) Office of the Deputy Assistant Secretary of the Army (Environment, Safety and
Occupational Health) or ODASA(ESOH)
Mr. Geoffrey Carton
Support Contractor, CALIBRE Systems Headquarters Department of the Army (HQDA) ODASA(ESOH)
Mr. Hudson Kekaula
Senior Environmental Program Manager Pacific Ocean Division (POD) U.S. Army Corps of Engineers
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Agenda Location Background and Site History Authority Remedial Investigation-Like Study Technology (Removal and At-sea
Demilitarization) Demonstration Associated Research and Activities Summary and Websites Q&A
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Site Location
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1996: Reports of munitions at Pokai Bay, Wai’anae Sewage Treatment Plant 2002: USACE surveys military munitions present at Pokai Bay; none found
to pose an imminent and substantial hazard 2005: Community raises concerns with presence of military munitions 2006: National Oceanic and Atmospheric Administration (NOAA) conducts
Army-sponsored screening-level survey of Ordnance Reef (HI-06) 2007: - NOAA’s Screening-level Survey Report released to the public - Ordnance Reef Coordinating Council (ORCC) established 2009: University of Hawaii (UH) conducts sampling for remedial investigation
(RI)-like (sediment, seawater and biota) 2011: - Technology demonstrations conducted - Draft RI-like study submitted 2012: Follow-on investigation
Background
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Authority for Research at HI-06 FY07 John Warner National Defense Authorization Act
(NDAA), P.L. 109-364, Sec 314, Research on Effects of Ocean Disposal of Munitions
Required DoD to: Identify disposal sites Identify navigation and
safety hazards Research effects of disposed
military munitions on: The Ocean Environment Those Who Use It
Studies at HI-06 done as research and development
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Military Munitions Present at HI-06
Small Arms
Above .50 caliber to 105 mm
Larger than 105 mm, bombs,
rockets, etc. Area A 14 0 0 Area B 229 1,461 0 Area C 12,557 6,061 874 Total 12,800 7,525 874 Estimated quantities based on NOAA’s 2011 Coral Survey
Military munitions present are discarded military munitions (DMM) not unexploded ordnance (UXO)
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2006 NOAA Screening-level Survey Disposal area bounded to depth of about 300 + feet Munitions observed at depths from 24 feet to the survey’s
maximum depth (approximately 320 feet) Samples (97 sediment and 49 fish) collected and analyzed DNT detected in four sediment samples Explosives not detected in biota Low enhancement of metals in sediment Explosive hazards low, if munitions left undisturbed Health hazard low, but data gaps exist There was no evidence of widespread contamination from
munitions – some localized enrichment
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Scoping of RI-like Study
Community concerns based on results of 2006 NOAA Screening-level Survey: Are fish safe to eat? Fish caught not representative of those eaten
locally “Whole fish” analysis not reflective of local use Sampling not representative of seasonal
differences Detection limits for some metals too high
Study question: “Do munitions at Ordnance Reef pose an unacceptable risk to human health or the environment?
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Contaminants of Potential Concern (COPC)
TNT 2,4-Dinitrotoluene (DNT) 2,6-DNT 2-amino (Am)-4,6-DNT 4-Am-2,6-DNT RDX Picric acid Nitroglycerin Phthalates Pyrene
Arsenic (speciated) Copper Lead
Added for second round: 2,4-dinitrophenol Picramic acid
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Stratified Sampling Approach
Other sources of potential contamination considered were stormwater runoff, the municipal sewage outfall, and building materials deposited for an artificial reef
Investigation used four strata to separate impacts: Control - Natural (no DMM) reef (CON) Wastewater treatment plant outfall pipe (WWTP) Coastal non-point source stream discharge (NPS) Munitions disposal area on reef (DMM)
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Sampling Coverage Sample Type Samples Sediment 46 Seawater 16 Fish 79 Octopus 36 Crab 28 Seaweed (limu) 36
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Risk Assessment
Hawaiians tend to consume a greater amount of seafood than other Americans (54 g/day)
Interviews resulted in the use of two-seafood consumption levels in the risk assessment: HI-06 Average (84 g/day 10% from site) HI-06 High-end (161 g/day 100% from site)
Unlikely DMM area could support the rate of consumption used in the Human Health Risk Assessment (HHRA)
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Technology Demonstration
Preliminary actions Environmental Assessment (EA) - Findings of No
Significant Impact (FONSI) NOAA Coral Avoidance and Minimization of Injury
Plan (CAMIP) Demonstration Remotely Operated Underwater Munitions
Recovery System (ROUMRS) Energetic Hazards Destruction System (EHDS)
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Technology Demonstrations ROUMRS EHDS Underwater Portable Acoustic Contraband Detector
(PACD) In-situ explosive detection (Hammerhead) Corrosion assessment
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NOAA’s CAMIP Impacts to coral and other benthic habitats was a major
concern NOAA’s survey of sea-disposed munitions and coral Assisted Army in development of best management practices Identified relative risk to coral and other benthic habitats Led to more efficient use of field time Allowed NOAA to better protect resources
Minor injuries to corals — mitigate with coral nursery
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Coral Relief
Majority of area sand or uncolonized hard bottom
Coral colonies present, but
substantial space to for ROV
Coral colonies abundant, little space for ROV
Presence of large coral colonies
Little to no relief Low Low Low to moderate High
Low vertical relief Low Low to moderate Moderate to high High
High vertical relief Low Low to moderate Moderate to high High
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ROUMRS and EHDS Concept of Operations ROUMRS Process
Steps
Deploy ROV, document site and stage salvage basket on seafloor
Transit ROV to UWMM, tentatively identify and recover to
ROV hopper
Retract ROV hopper and transit to salvage basket
Transfer UWMM from ROV hopper to salvage basket
Once salvage basket is full, rig lift bag and towline and use ROV to
activate lift
Surface craft tows submerged salvage basket to DSV for
munitions demilitarization (EHDS)
EHDS Process Steps
Lift Salvage Basket on to DSV deck
Identify and inventory salvage basket contents
X-Ray and segregate munitions by size and fill
Use remotely operated, water cooled, band saw to cut munitions
Load RCBO and heat to appropriate temperature to
degrade energetics
Inspect and certify treated materials as safe or retreat,
recycle scrap
Lower salvage basket into water for reuse
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ROUMRS
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ROUMRS Operations – Underwater Recovery
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EHDS
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EHDS Identification and Remote Cutting
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ROUMRS: Able to survey sea-disposal areas and recover sea-disposed
munitions Recovered: 80 suspected munitions (138 items encrusted to bottom) 2,300 small arms
ROV is capable of supporting numerous scientific tools and research efforts
EHDS: Proved the at-sea disposal concept to be effective and a viable tool
for future use Destroyed: 74 medium to large caliber munitions and 2,300 small arms 330 pounds of explosives and 135 pounds of propellant
Technology Demonstration Results
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Associated Research and Activities
Survey of Propellants Washing Ashore NOAA Current Study and Modeling Community Outreach and UXO Awareness (3Rs) Ordnance Reef Coordinating Council (ORCC) Media Engagements
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Conclusions Community engagement is time consuming, but
critical to success A holistic approach to site characterization is
necessary Impacts from the sea-disposed munitions at
Ordnance Reef do not appear to be significant Tools are available for the recovery and at-sea
demilitarization of munitions Research is ongoing (corrosion, impact assessment) For a number of reasons (e.g., explosives safety) it is
best to leave underwater munitions alone Explosives safety education is a valid risk
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Questions?
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Mahalo!
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Back-up Slides
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Web Sites for Additional Information
HI-06 Ordnance Reef http://www.ordnancereefhawaii.org/ https://www.facebook.com/pages/Ordnance-Reef-Hawaii/169281289801652
(Facebook)
HI-05 Hawaii Undersea Military Munitions Assessment
(HUMMA) http://hummaproject.com/
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