Coordinating a Coastal Pipeline Response

On May 19, 2015, Plains All American Pipeline experienced a line rupture near Refugio State Beach in Santa Barbara County, California. Heavy crude oil saturated soil and moved through culverts that pass under California Highway 101 and Union Pacific Railroad infrastructure before entering the Pacific Ocean.

That geography shaped the response from the first operational period. Teams managed traffic-adjacent work zones, shifting access points and public visibility while maintaining a clean chain of command and consistent field controls.

The incident brought together federal, state and local agencies operating under a Unified Command structure. Stakeholder expectations ran high, and the response needed monitoring data that teams could use in the moment and defend afterward.

Onterris embedded within the Incident Command System to keep decision-making aligned across agencies, contractors and the responsible party. The goal stayed practical: translate field conditions into clear controls for crews, credible interpretation for community questions and sampling that could support cleanup endpoints.

Field teams paired real-time monitoring with analytical air sampling to inform task-based controls and personal protective equipment (PPE) decisions. The work program supported long shifts, variable conditions and multiple cleanup methods without losing consistency in how data was collected, logged and communicated.

Onterris also supported community-facing monitoring and interpretation so non-technical stakeholders received clear, health-protective context. That communication cadence reduced rumor-driven pressure on field operations while keeping risk decisions anchored in measurements.

Environmental sampling covered shoreline and nearshore settings to support cleanup verification and recovery planning. Teams maintained fit-for-purpose quality assurance and quality control, chain-of-custody discipline and documentation that could stand up to review after demobilization.

In an additional aspect of biological safety and potential economic impacts, tissue sampling was also completed for cultured abalone populations in the area. Testing for chemicals of concern related to the crude oil release confirmed levels were well below limits established by the State of California. Continued water sampling concluded that no detectable levels of PAHs were observed since the tissue sampling, indicating that consumption of abalone in the area did not pose a risk to human health.

Trustee agencies later estimated injuries across both shoreline and subtidal habitat footprints, reinforcing why defensible sampling mattered from the earliest days of the response.

Refugio remains a strong model for coastal releases where infrastructure constraints, unified command coordination and public attention collide. The work demonstrated how incident command integration and decision-grade monitoring can support safe execution, steady communication and credible cleanup decisions, even as conditions and priorities shift.

Onterris concluded on-site efforts with a human health risk assessment which included an evaluation of confirmation soil sampling data. Confirmation analysis demonstrated that remediation of the release area was effective and that residual conditions did not pose a health risk to future visitors.

Cleanup transitioned into longer-term assessment and restoration planning through the trustee process, setting a reference point for how future coastal incidents can align field execution with defensible environmental decision-making.