AMS was selected by the Department of the Interior (DOI) Bureau of Ocean Energy Management (BOEM) to provide on-call scientific monitoring of all Outer Continental Shelf (OCS) oil and gas operations in the Pacific Region as a key part of their environmental mitigation monitoring program. This 5-year project involved AMS implementing scientific studies to evaluate the effectiveness of environmental mitigation measures and project conditions required of post-lease oil and gas operations in the Pacific Region. Specific projects conducted included an assessment of the risk from potential Hydrogen Sulfide (H2S) gas releases from Pacific OCS operations to cause serious harm or pose a serious threat to public health, an investigation of the interactions between migrating birds and OCS oil and gas platforms, an evaluation of the potential for a temporarily-abandoned subsea completion offshore Point Conception in the OCS to be damaged and leaking hydrocarbons, and an assessment of the potential release of Polycyclic Aromatic Hydrocarbons (PAHs) from shell mounds located beneath oil and gas production platforms in the Santa Barbara Channel.