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(4) an equivalent device as approved by the Department. (e) In addition to the requirements of subsections (b), (c), and (d) of this section, secondary containment systems shall satisfy the following requirements: (1) external liner systems shall be: (A) designed or operated to contain 100 percent of the capacity of the largest tank within its boundary; (B) designed or operated to prevent run-on and infiltration of precipitation into the secondary containment system unless the collection system has sufficient excess capacity, in addition to that required in subsection (e)(1)(A) of this section, to contain run-on and infiltration. Such additional capacity shall be sufficient to contain run-on and infiltration of precipitation from a 25-year, 24-hour rainfall event; (C) free of cracks or gaps; and (D) designed and installed to completely surround the tank and to cover all surrounding earth likely to come into contact with the waste if released from the tank(s) (i.e., capable of preventing lateral as well as vertical migration of the waste). (2) Vault systems shall be: (A) designed or operated to contain 100 percent of the capacity of the largest tank within its boundary; (B) designed or operated to prevent run-on and infiltration of precipitation into the secondary containment system unless the collection system has sufficient excess capacity, in addition to that required in subsection (e)(2)(A) of this section, to contain run-on and infiltration. Such additional capacity shall be sufficient to contain run-on and infiltration of precipitation from a 25-year, 24-hour rainfall event; (C) constructed with chemical-resistant water stops in place at all joints (if any); (D) provided with an impermeable interior coating or lining that is compatible with the waste being transferred, stored or treated and that will prevent migration of waste into the concrete; (E) provided with a means to protect against the formation of and ignition of vapors within the vault, if the waste being transferred, stored or treated: 1. meets the definition of ignitable waste under section 66262.21 of this division, or 2. meets the definition of reactive waste under section 66261.23 of this division and may form an ignitable or explosive vapor; and (F) provided with an exterior moisture barrier or be otherwise designed or operated to prevent migration of moisture into the vault if the vault is subject to hydraulic pressure. (3) Double-walled tanks shall be: (A) designed as an integral structure (i.e., an inner tank within an outer shell) so that any release from the inner tank is contained by the outer shell; (B) protected, if constructed of metal, from both corrosion of the primary tank interior and the external surface of the outer shell; and