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Buzzards Bay – B120 Oil Release
June 2, 2005
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PresentersRichard J. Wozmak, P.E., P.H., L.S.P.
LSP-of-RecordNRDA Trustee
Other ParticipantsRichard Packard
MADEP
Mike HickeyMADMF
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IntroductionOver two years since oil spillInitial cleanup removed majority of oilImmediate Response Actions (IRA) ongoing to address isolated areas with limited oiling57 of 120 segments were completed (Partial RAO) last summerTier IA Permit was issued by MADEP last summerRemaining 63 segments are being addressed this year under MCP Phase II Comprehensive Response ActionsConceptual Site Model and Phase II Scope of Work in progress
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Cleanup Progress
Immediate Response ActionRespond to citizen reports of oilInspections for potential residual oil impactsAdditional cleanup (where feasible)
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Citizen Reports
No calls since the last public meeting in September 2004
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Inspections for Potential Residual Oil Impacts
Inspections at 5 segments with potential for residual oilLSP reconnaissances at approximately 20 segments that previously contained residual oil or contained sensitive habitat
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Additional IRA CleanupCleanup at Strawberry Point in Winter 2004 and Spring 2005
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Additional IRA CleanupCleanup at Strawberry Point in Winter 2004 and Spring 2005
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Leisure Shores/Howard’s Beach
IRA Modification Activities
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Leisure Shores/Howard’s Beach
IRA Modification Activities
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Leisure Shores/Howard’s Beach
Post-cleanup intertidal sediment samples collected in December 2004
Petroleum concentrations below federal ecological screening thresholds and MCP Method 1 health-based risk thresholds
Post-cleanup visual inspections in May 2005Residual oil (sporadic flecks), less than 1cm diameter, encountered in a small (approximately 10’ x 10’), localized area in lower intertidal zone
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Upcoming IRA Activities
Removal of small area (7 feet by 10 feet) of oil-impacted shallow sediment at the west side of West Island in Fairhaven
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Upcoming IRA Activities
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Upcoming IRA Activities
We are currently evaluating the benefit of additional response actions at Leisure Shores/Howard’s Beach
FeasibilityTimingPotential adverse ecological impacts
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Upcoming IRA Activities
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Upcoming IRA Activities
Will respond to citizen reports of oilContact GeoInsight at 978-692-1114
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IRA Status Reports
March 2005 IRA Status Report July 23 to December 31, 2004Posted on buzzardsbay.org website
Next IRA Status Report August 2005January to June 2005Will be posted on buzzardsbay.org
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Conceptual Site Model
Expected and actual fate and transport of released oilAreas where residual oil could potentially be locatedPotential exposure pathways and receptorsUsed as a basis to develop additional data collection under Phase II
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CSM Based On:Physical properties of oilRelease characteristicsProperties/characteristics of Buzzards BayLiterature-based oil fate/transport
DegradationPersistence
Field observationsAerial overflightsSubtidal evaluationIntertidal evaluation
Computer modeling of release and initial fate and transportCleanup Operations
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Initial Oil Fate Schematic
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CSM ResultsInitial distribution based on
modeling (1 Week)Shoreline Stranding – 95% of spilled oilMost of remainder would evaporate (4%) and less than 1% would dissolve or sink
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CSM Model Results
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CSM ResultsCurrent (2 years after spill)
Sandy Beaches (Barney’s Joy)
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CSM ResultsCurrent (2 years after spill)
Mixed sand and gravel beachesCrescent Beach, MattapoisettFort Taber, New Bedford
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CSM ResultsCurrent (2 years after spill)
Seawalls, Bulkheads, Groins, and Piers(Salter’s Point)
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CSM ResultsCurrent (2 years after spill)
Salt Marshes (Strawberry Point)
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CSM ResultsCurrent (2 years after spill)
Salt Marshes (Pope’s Beach)
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CSM ResultsCurrent (2 years after spill)Subtidal
CSM results – no significant subtidal oiling initially or currently
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CSM ResultsPotential Receptors
HumansAquatic organisms (fish, mussels)Terrestrial organisms (plants, birds)
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CSM Report
Use to support/direct Phase II characterizationCSM will be included in the upcoming Phase II Scope of Work
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Phase II Work Scope
Develops approach to evaluate riskDevelops sufficient environmental data and information on residual oil
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Phase II Work Scope
Characterize “worst-case” subset of segments
Focus on sand and gravel beaches, rocky shorelines, and marshes
Characterize nearshore subtidal areasQuiescent areas adjacent to heavily oiled segments
Anticipated work scope completion date July 2005
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Upcoming Phase II Activities
Site inspections and sampling in summer/fall 2005Phase II Report winter of 2005/2006For segments which meet MCP criteria
Partial RAOFor any remaining segments
Phase III Remedial Action Plan –remediation feasibility study
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Closing
Buzzardsbay.org websiteNext meeting will be scheduled at the completion of the Phase II report