PHMSA is issuing an Advisory Bulletin to operators of hazardous liquid pipeline facilities required to prepare and submit an oil spill response plan under 49 CFR part 194. In light of the Deepwater Horizon oil spill in the Gulf of Mexico, which has resulted in the relocation of oil spill response resources to address the oil spill, PHMSA is reminding operators of their responsibilities to review and update their oil spill response plans and to comply with other emergency response requirements to ensure the necessary response to a worst case discharge from their pipeline facility.