UST Release Detection & Prevention 3

Question 1

Which of the following best describes 'interstitial monitoring' as a release detection method?

Accepted Answer

Testing the space between a double-walled tank or piping for the presence of product or water

Answer

Interstitial monitoring checks the interstitial space between the primary and secondary walls of double-walled tanks or piping for evidence of a release.

Question 2

A suction piping system that uses a check valve at the tank is considered 'safe suction' if the piping:

Accepted Answer

Slopes back toward the tank and operates at negative pressure

Answer

Safe suction piping slopes back toward the tank, has only one check valve at the pump end, and operates under negative pressure so that any leak drains back into the tank.

Question 3

For underground storage tanks storing petroleum, what is the maximum allowable inventory variance before an investigation is required under most state regulations?

Accepted Answer

1% of throughput plus 130 gallons

Answer

Most states follow the EPA guideline that a variance exceeding 1% of monthly throughput plus 130 gallons triggers a suspected release investigation.

Question 4

Which document must operators maintain on-site (or readily available) to demonstrate compliance with release detection requirements?

Accepted Answer

Release detection monitoring records for the past year

Answer

Operators must keep release detection records, including results of monitoring and testing, for at least one year and make them available for inspection.

Question 5

Under EPA's 2015 UST rule, new and replaced tanks must use which release detection approach?

Accepted Answer

Secondary containment with interstitial monitoring

Answer

The 2015 EPA rule requires new and replaced USTs to have secondary containment (double walls) with interstitial monitoring as the release detection method.

(UST) Underground Storage Tank Certification Practice Test

(UST) Underground Storage Tank Certification Practice Test

UST Release Detection & Prevention 3