Identify the primary standard for USTs construction materials.

The primary standard for underground storage tank (UST) construction materials is that they must comply with the performance standards set by Environmental Protection Agency (EPA) regulations. These standards are established to ensure the safety and reliability of UST systems. They address critical aspects such as leak prevention, structural integrity, and corrosion resistance. By adhering to these established performance standards, operators can minimize environmental risks associated with the storage of hazardous materials.

Compliance with state building codes, while important, does not supersede the specific performance standards related to environmental protection. Similarly, the use of any materials available is not acceptable, as not all materials will meet the necessary safety and performance requirements mandated by the EPA. Lastly, while adherence to industry best practices is valuable, it cannot replace the regulatory requirements put in place by the EPA. This particular focus on regulatory compliance ensures that USTs are built to withstand potential hazards and protect public health and the environment effectively.