Section 3102 addresses storage of hazardous liquids in tanks. Underground tanks must have cathodic protection or be constructed of corrosion-resistant materials. Double-wall tanks provide secondary containment if the primary tank leaks. Tank access through access plates permits inspection and maintenance. Overfill protection prevents tank overflow and spill of contents. Leak detection systems alert operators to tank leakage. Decommissioning of old tanks requires removal and disposal of residual contents.