26.04 What are the special requirements for underground tanks in California?

California regulations include:

1. Pre-qualification approval of all equipment and materials used in underground fuel tank systems.
2. Full secondary containment of all tanks and piping.
3. Fill pipes and spill container located within secondary containment sumps. All tank openings including tank gauging within secondary containment sumps.
4. Periodic testing of secondary containment piping, sumps, tanks, and tank monitors.
5. Double wall construction for tank sumps and piping transition sumps.
6. Double containment of vent piping.
7. Continuous positive monitoring of tank, pipe, and sump secondary containment by vacuum, pressure, or hydrostatic method.
8. Precision leak detection testing after installation and backfill using tracer gas method.