Source spill samples should be taken from vessels/facilities that have what?

The correct answer is based on the notion that taking source spill samples from vessels or facilities should occur when there is the opportunity to do so. This is important because the quality and accuracy of sample collection depend on timing and available access to the site where the spill occurred. If an incident happens and the opportunity to collect samples is present, it ensures that the response team can gather critical data swiftly, which is essential for assessing the extent of the spill and determining appropriate actions for mitigation.

The understanding of this context emphasizes the importance of situational awareness during spill events. While other factors might contribute to the overall management of spills, the chance to collect samples when they are most relevant and informative is crucial for effective response and environmental protection.