This case addresses violations documented at approximately 35 of Hilcorps 72 affected facilities in
Alaska. Region 10 inspected three Hilcorp facilities in Alaska to evaluate compliance with Clean Air
Act, New Source Performance Standards, Subpart OOOOa - Standards of Performance for Crude Oil
and Natural Gas Facilities. Based on field inspections and records review EPA found the company
failed to repair vapor leaks of volatile organic liquids (VOC) and methane within required deadlines, to
re-check their repairs, to conduct an initial leak inspection for a new facility, and to report accurately on
their leak detection and repair activities during the three years reviewed. This CAFO action follows an
NOV issued by R10 in April 2020 for Subpart OOOOa violations.