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Joint Cover Memo on
Joint Investigation Team Report of Investigation

“Fy

The United States Coast Guard and the Bureau of Ocean Energy Management,
Regulation & Enforcement (BOEMRE) have completed their joint investigation into the
explosion and fire onboard the Mobile Offshore Drilling Unit (MODU) DEEPWATER
HORIZON that occurred on April 20, 2010.

A jointly-issued Convening Order dated April 27, 2010, formed a Joint Investigation
Team (JIT) to help both agencies identify the causal factors that led to the blowout at the
Macondo well and the explosion and fire on the DEEPWATER HORIZON and make
recommendations to prevent similar incidents in the future. The joint investigation was
conducted under an agreed Statement of Principles that ensured the investigative process
was rigorous, comprehensive, independent and transparent. The JIT was composed of
four lead members and supporting technical staff from each agency. Together, the JIT
held seven public hearings and took the testimony of more than 80 witnesses; conducted
multiple interviews with more than 25 individuals: received, processed, and analyzed
hundreds of thousands of pages of documents; and maintained custody of hundreds of
pieces of physical evidence, ranging from small rock samples to the blowout preventer
that had been in place at the Macondo wellhead. The JIT designated 17 Parties in
Interest, who were afforded their statutory rights specified in 46 U.S.C. § 6303. We
thank the members of the JIT for their diligent work in completing this challenging
assignment and commend them for their thorough inquiry.

The enclosed Report of Investigation contains the findings, analyses, conclusions, and
recommendations of the JIT. Volume I, as accepted by the Commandant’s Final Action,
of the report addresses issues within the jurisdiction of the United States Coast Guard,
specifically the factors related to the vessel and its systems that likely contributed to the
marine casualty, and the subsequent evacuation, firefighting and search and rescue
efforts. Volume II addresses the causes of the blowout, including factors related to the
Macondo well drilling operations, well abandonment procedures and well control that are
within the jurisdiction of BOEMRE. Each volume was prepared according to the
respective agency’s internal processes and complements the other. Together, they
provide a comprehensive assessment of the incident. The two volumes comprise the
completed joint Report of Investigation.
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<div class="page"><p></p>
<div class="ocr">As reflected in the Report of Investigation, the United States Coast Guard and BOEMRE
are already undertaking significant reforms of the domestic regulatory and oversight
regime for MODUs and offshore activities on the outer continental shelf (OCS), and
where appropriate, within the international maritime community. The United States
Coast Guard and BOEMRE are committed to maintaining a close partnership that will
leverage our respective authorities and expertise for protecting our OCS and the offshore
industry workforce. We will work to keep pace with changes in industry practices and
drilling procedures, and will work together to implement a structured framework with
appropriate standards to effectively manage risks to ensure safe, secure. and

enviropr responsible operations.

Michael R. Bromwich
‘oast Guard Director, Bureau of Ocean Energy
Management, Regulation & Enforcement

SEP 09 201
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