In 2023, and EPA and a Guam inspector performed an on-site inspection of the Tristar facility and found that an unauthorized discharge of oily wastewater had reached the Big Guatali River. The EPA observed that the facility had not properly operated and maintained treatment units, including the oil water separator, which led to inadequate treatment and excess oily wastewater leaving the facility. Under the order, Tristar has agreed to: Tristar Terminals Guam, Inc. owns and operates the over 200-acre facility where it receives, stores and distributes over 20 fuel storage tanks. The facility receives, stores and distributes gasoline, A1 jet fuel, liquefied petroleum gas, Number 5 residual fuel oil and ultra-low sulfur fuel. The EPA's proposed settlement with Tristar Terminals Guam, Inc. addresses the violations found at the facility.