What do yellow paint markings by a One Call System representative indicate?

The yellow paint markings by a One Call System representative specifically indicate the presence of gas, oil, steam, petroleum, or gaseous materials. This color code is crucial for ensuring safety during excavation and construction activities, as these utilities can pose significant hazards if accidentally disrupted. Prior to any digging, identifying these markings helps operators and workers avoid damaging essential pipelines that could lead to leaks or explosions, ensuring that all safety protocols are followed.

Other markings represent different utilities, such as water and irrigation lines indicated by blue or green paint, electrical lines marked in orange, and temporary survey markings typically shown in pink. Each color serves a distinct purpose in helping workers identify the nature of underground utilities before commencing any excavation work. Understanding these color codes is essential for heavy equipment operators to maintain safety and prevent accidents on the job site.