5703.6.2.2 Below-Grade or Underground Piping Systems Connected to a Tank in an Underground Area
Below-grade or underground piping systems that are connected to a tank in an underground area shall have secondary containment. The building, room or area in which the flammable or combustible liquid is stored or located may be used as secondary containment if it meets the containment and drainage methods as described in Section 5004.2.2.1.
All portions of below-grade and underground piping systems shall be monitored for leaks by one of the following methods:
- A listed or approved leak detection system that either activates an audible and visual alarm or stops the flow of product when a leak is detected.
- Direct visual inspection conducted monthly by designated personnel.
- Indirect visual inspection conducted monthly through the use of, but not limited to, mirrors, cameras or video equipment.
- If the above methods cannot be met, an alternative means shall be provided in accordance with Section 188.8.131.52.
- Piping systems connected to a tank in an underground area that is used solely in connection with a fire pump or emergency system, legally required standby system, or optional standby system as specified in Health and Safety Code Section 25270.2(o)(1)(C)(iii).
- Piping systems connected to a tank in an underground area that contains petroleum to be used or previously used as a lubricant or coolant in a motor engine or transmission or oil-filled operational equipment or oil-filled manufacturing equipment, as described in Health and Safety Code Section 25270.2(o)(1)(C)(i).
- Piping systems connected to a petroleum hazardous waste tank in an underground area that complies with the hazardous waste tank standards pursuant to the California Code of Regulations, Title 22, Chapter 15, Article 10 (commencing with Section 66265.190), and the facility has been issued a unified program facility permit pursuant to Health and Safety Code Section 25404.2 for generation, treatment, accumulation, or storage of hazardous waste, as described in Health and Safety Code Section 25270.2(o)(1) (C)(ii).