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NRDA Workplans
The Trustees have and will continue to release study plans developed over the course of the spill. The process for development of each plan reflects input and advice from experienced Trustee scientists and resource managers as well as leading experts from outside the Trustee entities, including scientists who specialize in studying oil spills and natural resources in the Gulf of Mexico. The earliest approved plans are very brief as they were developed quickly to capture immediate, potentially perishable data during an evolving event. The plans also reflect the different nature of resources, data requirements, and associated study methods and techniques.

Preassessment Workplans
Because study methods used for preassessment activities may also be applied in future injury assessment studies, some of the plans provide for both near term and longer term data collection or studies. As data from the studies become available, the Trustees may adapt study approaches or methods, or consider conducting additional studies, as needed, to ensure that the impacts of the oil spill can be fully identified and measured. This iterative process is intended to obtain the highest quality scientific information available to determine how much harm to resources has occurred and how much restoration is required.
DWH NRDA Louisiana Work Plans
Work Plan for Estimating Mortality of Birds Using Beached Bird Surveys in Louisiana for the Mississippi Canyon 252 Oil Spill (Bird Study #1A-LA)
Work Plan for Estimating Secretive Marsh Bird Mortality Deepwater Horizon (MSC 252) Oil Spill NRDA Bird Study #3
Work Plan for Estimating Oiling Rates Among Pelagic Birds Using Ship Based Surveys in the Vicinity of the Deepwater Horizon (MSC 252) Oil Spill (Bird Study #6)
Work Plan for Estimating Oiling and Mortality of Breeding Colonial Waterbirds from the Deepwater Horizon (MSC 252) Oil Spill (Bird Study #4)
Amendment to Work Plan for Estimating Oiling and Mortality of Breeding Colonial Waterbirds from the Deepwater Horizon (MC 252) Oil Spill (Bird Study # 4)
Work Plan for Aerial Surveys and Photographic Census for Birds in the Vicinity of the Deepwater Horizon (MSC 252) Oil Spill –Bird Study #2
Natural Resource Damage Assessment Work Plan for Determining Injury to the Piping Plover (Charadrius melodus) from the Deepwater Horizon (MC 252) Oil Spill Bird Study #7
Natural Resource Damage Assessment Pre-Assessment Work Plan for Determining Injury to Bald Eagles from the Deepwater Horizon (MC 252) Oil Spill (Bird Study #9, Part 2)
Procedure for Obtaining NRDA Submerged Oil Samples from the Nearshore Environment
Procedure for Obtaining Source Oil Samples from Discoverer Enterprise Drillship
Water Column Injury Ephemeral Data Collections Deepwater Horizon Oil Spill (DWHOS) Plan for Adaptive Water Column NOAA-NRDA Sampling (PAWNNS) Cruise Plan- American Diver 1 and Ocean Veritas 9
Amended Water Column Injury Ephemeral Data Collections Deepwater Horizon Oil Spill (DWHOS) Plan for Adaptive Water Column NOAA-NRDA Sampling (PAWNNS) Cruise Plan- American Diver 1
Water Column Injury Ephemeral Data Collections Deepwater Horizon Oil Spill (DWHOS) Plan for Adaptive Water Column NOAA-NRDA Sampling (PAWNNS) Cruise Plan- American Diver 2
Water Column Injury Ephemeral Data Collections: Deepwater Horizon Oil Spill (DWHOS) Plan for Adaptive Water Column NOAA-NRDA Sampling (PAWNNS) Cruise Plan – Hos Davis 1
Water Column Injury Ephemeral Data Collections: Deepwater Horizon Oil Spill (DWHOS) Plan for Adaptive Water Column NOAA-NRDA Sampling (PAWNNS) Cruise Plan – Hos Davis 2
Water Column Injury Ephemeral Data Collections: Deepwater Horizon Oil Spill (DWHOS) Plan for Adaptive Water Column NOAA-NRDA Sampling (PAWNNS) Cruise Plan – Hos Davis 3
NRDA Plankton Sampling Plan & Fall 2010 Cruise Plan Specialty Diver 1 – September 2010 SIPPER Cruise
NRDA SEAMAP Plankton Sampling Plan & Fall 2010 Cruise Plan
NRDA Plankton Sampling Plan & Fall 2010 Cruise Plan: Walton Smith 1
NRDA Plankton Sampling Plan & Fall 2010 Cruise Plan: Walton Smith 2
NRDA Plankton Sampling Plan & Fall 2010 Cruise Plan: Walton Smith 3
NRDA Winter 2011 Plankton Imaging Sampling Cruise Plan: Arctic
NRDA 1-meter MOCNESS Winter 2011 Plankton Sampling Cruise Plan: Nick Skansi
NRDA 1-meter MOCNESS Spring 2011 Plankton Sampling Cruise Plan
NRDA 10-meter MOCNESS Winter 2011 Plankton Sampling Cruise Plan: Meg Skansi
NRDA 10-meter MOCNESS Spring 2011 Plankton Sampling Cruise Plan
AUV Reconnaissance Survey II of Hard-Ground Megafaunal Communities in the Vicinity of the Deepwater Horizon Spill Site
Deepwater Sediment Sampling to Assess Potential Post-Spill Benthic Impacts from the Deepwater Horizon Oil Spill
Pre-Assessment Plan for the Collection of Data to Determine Potential Exposure and Injuries of Threatened Gulf Sturgeon
Investigative Plan for Fish and Invertebrate Kills in the Northern Gulf of Mexico
Investigative Plan to Monitor and Assess the Potential for Impacts of the Deepwater Horizon Oil Spill on Whale Sharks in the Northern Gulf of Mexico using Satellite Tag Technology
Addendum to Investigative Plan to Monitor and Assess the Potential for Impacts of the Deepwater Horizon Oil Spill on Whale Sharks in the Northern Gulf of Mexico using Satellite Tag Technology
Deepwater Horizon Oil Spill (DWHOS) NRDA Offshore Deep Meso- and Bathypelagic Fish Sampling Plan
NRDA Offshore Deep Meso- and Bathypelagic Fish Sampling Plan, Spring 2011
Addendum to: NRDA Offshore Deep Meso- and Bathypelagic Fish Sampling Plan, Spring 2011
Addendum: Collection of Data to Determine the Impacts of the Deepwater Horizon Mississippi Canyon 252 Incident on Endangered and Protected Marine Mammals in the Northern Gulf
Aerial Surveys for Assessing Marine Mammals and Sea Turtles in the Region of the Mississippi Canyon 252 Incident
Amended Aerial Surveys for Assessing Marine Mammals and Sea Turtles in the Region of the Mississippi Canyon 252 Incident
Mississippi Canyon 252 Pre Assessment Plan to Determine Potential Exposure and Injuries of Nesting and Hatchling Loggerhead Sea Turtles
Mississippi Canyon 252 Incident Pre Assessment Plan to Determine Potential Exposure and Injuries of Nesting and Hatchling Kemp's Ridley Turtles
Preassessment Plan to Determine Potential Exposure and Injuries of Sea Turtles West of the Mississippi Delta Utilizing Entanglement Netting Surveys
Proposed Data Collection Plan to Assess Injury to Louisiana and Mississippi Estuarine Dolphin Stock
Addendum Proposed Data Collection Plan to Assess Injury to Louisiana and Mississippi Estuarine Dolphin Stock
Second Addendum Proposed Data Collection to Assess Injury to Estuarine Dolphin Stocks
Post-Release Monitoring/Tracking of Injured, Stranded, or Entrapped and Released Cetaceans in the Oil Spill Impact Area
Proposed Data Collection Plan to Assess Injury to West Indian Manatees from the Deepwater Horizon Oil Spill Outside of Florida
Addendum to Proposed Data Collection Plan to Assess Injury to West Indian Manatees from the Deepwater Horizon Oil Spill Outside of Florida
Unscheduled HARP Recovery February Mission Plan
MC252 Deepwater Horizon Oil Spill Dry Tortugas MARU and HARP Recovery February Mission Plan
Assessing Sublethal and Chronic Health Impacts from the Mississippi Canyon 252 Incident on Coastal and Estuarine Bottlenose Dolphins
Shoreline/Vegetation NRDA Pre-Assessment Data Collection Plan
Shoreline/Vegetation Rapid Shoreline Oiling Survey NRDA Pre-Assessment Data Collection Plan
Mississippi Canyon 252 Oil Spill Submerged Aquatic Vegetation Tier 1 Pre-Assessment Plan Pre-Impact Baseline Characterization
Natural Resource Damage Assessment Work Plan for Assessing Potential Impacts to Fresh and Brackish Water Submerged Aquatic Vegetation Communities from the Deepwater Horizon (MC 252) Oil Spill
Deepwater Horizon/Mississippi Canyon 252 Oil Spill Sampling and Analysis Plan for Jean Lafitte National Historic Park and Preserve Submerged Aquatic Vegetation Natural Resource Damage Assessment
Mississippi Canyon 252 Spill Oyster Sampling Plan Phase I – High Priority Sites
Mississippi Canyon 252 Spill Oyster Sampling Plan Phase I – High Priority Sites Amendment 1
Mississippi Canyon 252 Spill Oyster Sampling Plan Phase I – High Priority Sites Amendment 2
Mississippi Canyon 252 Spill Oyster Sampling Transition Plan Summary
Assessment Plan for Juvenile Sea Turtles in Sargassum Communities Potentially Exposed to MC 252 Discharge
2011 Addendum to the Assessment Plan for Juvenile Sea Turtles in Sargassum Communities Potentially Exposed to MC 252 Discharge
Assessment Plan for Sargassum Communities and Associated Fauna in the Northern Gulf of Mexico
Work Plan for Sediment and Water Collection and Analyses for Baseline NRDA Purposes in Louisiana
Pre-Assessment Phase Water Sampling for NRDA Purposes in Louisiana
Addendum to the Pre-Assessment Phase Water Sampling Plan: Pre-Assessment Phase Sediment Sampling for NRDA Purposes in Louisiana
Technical Specifications and Scope of Work/Services for Aerial Image Acquisition and Image Processing in Support of the MC252 NRDA Process
Work Plan for Obtaining Near Shore Spatial Extent of On-Water Oil Samples
1st Addendum to Work Plan for Obtaining Near Shore Spatial Extent of On-Water Oil Samples
2nd Addendum to Work Plan for Obtaining Near Shore Spatial Extent of On-Water Oil Samples
NRDA Plankton Sampling Plan & Winter 2011 Cruise Plan
NRDA Spring 2011 Plankton Imaging Sampling Cruise Plan: Oceanus
Mississippi Canyon 252 Spill Spring 2011 Oyster Recruitment Sampling Plan
Addendum: NRDA 10-meter MOCNESS Spring 2011 Plankton Sampling Cruise Plan
Mississippi Canyon 252 Spill Oyster Sampling Transition Plan Summary Amendment 1
Addendum to Plan to Determine Potential Exposure and Injuries of Sea Turtles West of the Mississippi Delta Utilizing Entanglement Netting Surveys
Submerged Oil Characterization Across Multiple Habitats for Assessment of Persistent Exposures in Nearshore Sediments Deepwater Horizon Oil Spill (DWHOS)
NRDA Offshore Deep Meso- and Bathypelagic Fish Sampling Plan Summer 2011
NRDA July 2011 McArthur II Epipelagic Plankton Bongo & Neuston Sampling Cruise Plan
Addendum to: NRDA Spring 2011 Epipelagic Plankton Bongo/Neuston Sampling Cruise Plan
Nearshore Cetacean & Sea Turtle Prey Item Sampling Plan
Proposed Data Collection Plan to Assess Injury to Louisiana and Mississippi Estuarine Dolphin Stocks: Third Addendum
Addendum to: NRDA Spring 2011 Plankton Imaging Sampling Cruise Plan
Addendum to: NRDA Summer 2011 Epipelagic Plankton Bongo & Neuston Sampling Cruise Plan
Sampling and Monitoring Plan for the Assessment of MC252 Oil Impacts to Coastal Wetland Vegetation in the Gulf of Mexico
Assessment Plan for Marsh Edges and Sandy Shorelines
NRDA 10-meter MOCNESS Summer 2011 Plankton Sampling Cruise Plan: Meg Skansi
Quantifying the Distribution, Abundance and Biodiversity of Benthic Megafauna and Mesopelagic/Bathypelagic Megaplankton in the Vicinity of the MC252 Spill Plan Addendum
Work Plan for the Collection of Data to Determine the Impacts of the Deepwater Horizon Mississippi Canyon 252 Incident on Endangered and Protected Marine Mammals in the Northern Gulf
Assessing Changes in Population Size and Spatial Distribution of Marine Mammals and Turtles in the Northern Gulf of Mexico-Addendum
Mississippi Canyon 252 Spill Spring 2011 Oyster Recruitment Sampling Plan-Amendment 1
Mississippi Canyon 252 Spill Spring 2011 Oyster Recruitment Sampling Plan-Amendment 2
Northern Gulf of Mexico HARP Servicing Cruise: September and December 2011 Mission Plan
ADCP-Measured Currents Monitoring Plan: September 2011 ADCP Maintenance Plan
Quantifying the Distribution, Abundance and Biodiversity of Benthic Megafauna and Mesopelagic/Bathypelagic Megaplankton in the Vicinity of the MC252 Spill
Addendum to the Preassessment Plan to Determine Potential Exposure and Injuries of Nesting and Hatchling Loggerhead Sea Turtles and Loggerhead Sea Turtle Nests
Satellite Tracking of Sperm Whales in the Gulf of Mexico in 2011, a Follow-up to the Deepwater Horizon Oil Spill
Mississippi Canyon 252 Spill Oyster Sampling Plan 2011 Oyster Quadrat and Sediment Sampling
NRDA Offshore Deep Meso- and Bathypelagic Fish Sampling Plan September 2011
NRDA Late-Summer 2011 McArthur II Small Pelagics Sampling Plan
Deepwater Horizon, Mississippi Canyon 252 Spill - Light Detection and Ranging (LIDAR) Data Acquisition
Addendum to Preassessment Plan to Determine Potential Exposure and Injuries of Nesting and Hatchling Kemp’s Ridley Turtles
MC252 Deepwater Horizon Oil Spill Northern Gulf of Mexico MARU Recovery Mission Plan November 2011
July-September 2011 HOS Sweetwater ROV Sediment and Bottom-Water Sampling Cruise Plan
Assessing Changes in Population Size and Spatial Distribution of Marine Mammals and Turtles in the Northern Gulf of Mexico
Assessment of the Impacts of the Deep Water Horizon Oil Spill on Blue Crab Early Life History Stages: Addendum Phase II: Sample Sorting and Identification
NRDA Summer 2011 Plankton Imaging Sampling Cruise Plan
NRDA Summer 2011 Epipelagic Plankton Bongo & Neuston Sampling Cruise Plan
Assessment Plan for Sargassum Communities and Associated Fauna in the Northern Gulf of Mexico: Addendum for Field work to support Sargassum mapping
NRDA 1-meter MOCNESS Summer 2011 Plankton Sampling Cruise Plan: Nick Skansi
Addendum to: NRDA 1-meter MOCNESS Spring 2011 Plankton Sampling Cruise Plan
NRDA UV Radiation Sampling Plan: October 2010 Cruise Plan
Mississippi Canyon 252 Oil Spill First Work Plan for the Collection of Data Related to Beach Usage Along the Coast of the Gulf of Mexico
Assessment of the Impacts of the Deep Water Horizon Oil Spill on Blue Crab Early Life History Stages Phase I: Megalopae Sample Collection
Sargassum Injury Assessment Plan: mapping using remote sensing
Mississippi Canyon 252 Oil Spill Submerged Aquatic Vegetation Tier 2 Pre-Assessment Post Spill Exposure Characterization Plan
Holding Time Study for Environmental Samples in Frozen Archives: Laboratory Analysis Plan
Nearshore Cetacean & Sea Turtle Prey Item Sampling Plan: Addendum to Update Target Species List
Addendum to Satellite Tracking of Sperm Whales in the Gulf of Mexico in 2011, a Follow-up to the Deepwater Horizon Oil Spill: Analysis Plan for Years 2010/2011
MC252 Deepwater Horizon Oil Spill ADCP-Measured Currents Monitoring Plan: June 2011 ADCP Maintenance Plan
MC252 Deepwater Horizon Oil Spill ADCP-Measured Currents Monitoring Plan: December 2010 Quarterly Maintenance Mission
MC252 Deepwater Horizon Oil Spill ADCP-Measured Currents Monitoring Plan: September 2010 Maintenance Mission
Work Plan for MC252 Oil Impacts to Marsh Fiddler Crabs and Periwinkles along the Gulf of Mexico
Assessing Potential Sublethal and Chronic Health Impacts from the Mississippi Canyon 252 Oil Spill on Coastal and Estuarine Bottlenose Dolphins: Addendum
MC252 Deepwater Horizon Oil Spill MARU & HARPS Recovery February 20 – March 9 Mission Plan
Addendum to the Sampling and Monitoring Plan for the Assessment of MC252 Oil Impacts to Coastal Wetland Vegetation in the Gulf of Mexico: 2012 Data Collection
Addendum to the Sampling and Monitoring Plan for the Assessment of MC252 Oil Impacts to Coastal Wetland Vegetation in the Gulf of Mexico
NRDA Tier 1 for Deepwater Communities-Addendum Plan for Coral Aging
Time Critical Assessment: Gulf Coast Breeding, Beach-Nesting Bird Populations in Areas Impacted by the BP Deepwater Horizon/Mississippi Canyon 252 Oil Spill (Bird Study #8)
Work Plan for Estimating Secretive Marsh Bird Mortality Deepwater Horizon (MSC 252) Oil Spill NRDA Bird Study #3 Modification #1: Marsh Bird Helicopter Survey Methodology
Workplan for Estimating Wintering Waterfowl Oiling and Mortality Bird Study Plan # 10-Trustee Only
Natural Resource Damage Assessment Work Plan for Preassessment of Injury to Osprey From the Deepwater Horizon (MC 252) Oil Spill (Bird Study #9)
Time-Critical Natural Resource Damage Assessment Feasibility Study: Estimating Carcass Detection in Priority Waterfowl Habitats Impacted by the Deepwater Horizon (Mississippi Canyon 252) Oil Spill (Bird Study #11)
Second Addendum to Assessment Plan for Sargassum Communities and Associated Fauna in the Northern Gulf of Mexico: Sargassum Sample Processing Plan for Remotely Operated Underwater Vehicle (ROV) Data, Bongo Net Samples and Neuston Net Samples
Tagging of Atlantic Bluefin Tuna for Evaluation of Habitat Utilization of Gulf of Mexico Spawning Grounds Using Telemetry Data
NRDA Offshore Fish and Nekton Sample Processing Plan
Amendment: Mississippi Canyon 252 Oil Spill First Work Plan for the Collection of Data Related to Beach Usage Along the Coast of the Gulf of Mexico
NRDA CTD Processing Plan
Assessment Plan for Bird Colony Aerial Photography-2012
Mississippi Canyon 252 Spill Oyster Sampling Transition Plan-Amendment 2: Sediment Sample Analysis
Deepwater Horizon Oil Spill (DWHOS) Water Column Technical Working Group Image Data Processing Plan: Holocam, DAVPR, VPRII
Deepwater Horizon/Mississippi Canyon 252 Oil Spill Plan for Assessing Recovery of Submerged Aquatic Vegetation Propeller Scars at Gulf Islands National Seashore
Dauphin Island Sea Lab Severe Weather Sample Preservation Plan
Addendum to: July-September 2011 HOS Sweetwater ROV Sediment and Bottom-Water Sampling Cruise Plan
Addendum to: NRDA CTD Processing Plan – Processing of Towed CTD Data
Addendum: Assessment Plan to Determine Potential Exposure and Injuries of Nesting and Hatchling Kemp’s Ridley Turtles and Their Nests - 2012 Field Season
Addendum: Assessment Plan to Determine Potential Exposure and Injuries of Nesting and Hatchling Loggerhead Sea Turtles and Loggerhead Sea Turtle Nests – 2012 Field Season
Analytical Addendum: Assessment Plan to Determine Potential Exposure and Injuries of Nesting and Hatchling Kemp’s Ridley and Loggerhead Sea Turtles and Their Nests: Sample Analysis Plan for Years 2010/2011
Using Radio Telemetry to Determine the Fates of Bird Carcasses Drifting in the Northern Gulf of Mexico (Bird Study #1D)
Addendum to:NRDA Plankton Processing Plan – Analysis of Zooplankton Samples
Work Plan (Bird Study #1C): Beach Carcass Persistence Study
Small Pelagics Addendum to the NRDA Nekton Processing Plan – Analysis of Nekton Samples
Addendum: Assessment Plan: Analysis of 2011 Colony Photographic Census Data Collected Under the Preassessment Plan For Bird Colony Aerial Photography - 2011
Addendum: Assessment Plan: Analysis of 2012 Colony Photographic Census Data Collected Under the Assessment Plan for Bird Colony Aerial Photography-2012
Deepwater Horizon/Mississippi Canyon 252 Oil Spill Sampling and Analysis Plan for Jean Lafitte National Historic Park and Preserve Submerged Aquatic Vegetation Natural Resource Damage Assessment Spring and Fall 2011 Surveys
Image Data Processing Plan: SIPPER
Bird Colony Aerial Photography – 2011
NRDA Spring 2011 Water Column Processes Cruise Plan: Walton Smith 4
Addendum #2 to: NRDA CTD Processing Plan - Density Check
Assessment Plan for Marsh Edges and Sandy Shorelines: Addendum for Chemical Analysis of Blue Crab Samples
Image Data Processing Plan: ISIIS
Nearshore Ephemeral Data Collections: Submerged Oil Characterization Across Multiple Habitats Deepwater Horizon Oil Spill (DWHOS)
Deepwater ROV Sampling to Assess Potential Impacts to Hardbottom Coral Communities and Associates from the Deepwater Horizon Oil Spill
Assessment of Impacts from the Deepwater Horizon Oil Spill on Red Crabs
Work Plan: Detection Probability (Searcher Efficiency) (Study 1B)
Assessment Plan Concerning Aerial Imagery in the Northern Gulf of Mexico