To what precision must a manual tank gauge stick be marked?

A manual tank gauge stick must be marked to a precision of 1/8 inch to ensure accurate readings of the fuel level within underground storage tanks (USTs). This level of precision is critical for monitoring fuel inventory, preventing overfills, and aiding in environmental compliance.

Marking the gauge stick to 1/8 inch allows for sufficient accuracy while still being practical for everyday use. This degree of precision enables operators to detect changes in fuel levels effectively and helps to minimize the risks associated with overfilling or leaks. Precise measurements are essential not only for operational efficiency but also for regulatory compliance and environmental protection.

In contrast, greater precision, such as 1/16 inch, might be unnecessarily detailed for regular usage and could increase the complexity of reading measurements. Meanwhile, less precision, like 1/4 inch or 1/2 inch, could lead to inaccuracies that might compromise the safety and management of the storage tanks. Thus, 1/8 inch strikes an appropriate balance that meets operational needs and safety standards effectively.