Manual tank gauging can be the sole means of leak detection for tanks that are up to what capacity?

Manual tank gauging is a method used to measure the liquid level in a tank to detect leaks. According to regulations, tanks with a capacity of up to 550 gallons can utilize manual gauging as the sole method of leak detection. The reasoning behind this limit is rooted in the reliability and accuracy of the method at smaller tank sizes.

For tanks larger than 550 gallons, other monitoring methods are recommended or required due to the increased complexity and potential consequences of leaks. Larger tanks may have more substantial environmental impacts which necessitate more sophisticated detection equipment to ensure that any potential leaks are identified quickly and effectively. Manual gauging requires more frequent measurements and is less effective at detecting small leaks compared to other methods available for larger tank capacities.

This regulation aims to promote environmental protection and ensure safety when dealing with underground storage tanks.