What is the best reference for determining the certification of a Phase II system at a site?

The CARB Executive Order applicable to the Gasoline Dispensing Facility (GDF) system is the most authoritative resource for determining the certification of a Phase II vapor recovery system at a site. This document outlines specific requirements and certifications issued by the California Air Resources Board (CARB), which is responsible for regulating air quality in California and ensuring that vapor recovery systems meet the necessary environmental and safety standards.

The Executive Order provides detailed guidelines on the performance standards that Phase II systems must adhere to, and it reflects the latest updates and compliance measures that are crucial for effective vapor recovery. It serves as a definitive reference for both manufacturers and operators, clearly stating what is acceptable for compliance, testing procedures, and other related regulations. This makes it the preferred resource over others like the manufacturer's user manual, local building codes, or EPA guidelines, which might provide relevant information but do not have the same level of specificity or authority regarding Phase II vapor recovery system certification as the CARB Executive Order does.