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Hazardous Waste Tank System Requirements for LQGs and Onsite Treatment Facilities - Page 4 of 14 ❑ Provided with a built-in, continuous leak detection system capable of detecting a release within 24 hours or at the earliest practicable time, if the owner/operator can demonstrate to DTSC, and DTSC concurs, that site conditions will not allow detection of a release within 24 hours. 5. Vault Systems — Vault systems must be: I22CCR §66265.193(e)(2)1 ❑ Designed or operated to contain 100 percent of the capacity of the largest tank within its boundary; ❑ 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 above, to contain run-on and infiltration of precipitation from a 25 -year, 24-hour rainfall event; ❑ Constructed with chemical -resistant water stops in place at all joints, if any; ❑ 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; ❑ 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 meets the definition of ignitable waste per 22 CCR §66262.21; or reactive waste per §66262.23 and may form an ignitable or explosive vapor; ❑ 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. 6. External Liner Systems — External liner (i.e., bermed) systems must be: I22CCR §66265.193(e)(gl ❑ Designed or operated to contain 100 percent of the capacity of the largest tank within its boundary; ❑ 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 above, to contain run-on and infiltration of precipitation from a 25 -year, 24-hour rainfall event; ❑ Free of cracks or gaps; ❑ 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). 7. Ancillary Equipment — Ancillary equipment must be provided with: ❑ Full secondary containment (e.g., trench, jacketing, double -walled piping) meeting the requirements of 22 CCR §66265.193(b) and (c). I22CCR§66265.193(01 ❑ Secondary containment as specified in §66265.193(f) or an alternative device or devices as annroved in writine by the CUPA, which would prevent and/or detect any release of wastes out of the tank system before such wastes could migrate to the soil, ground water, or surface water at any time during the use of the tank system. I22CCR§66265.193(•)1 The following are examples of alternatives that may be proposed for review and approval by the CUPA: ➢ Containment of the entire system within a bermed containment area with visual and/or electronic leak detection monitoring; ➢ Double -walled piping with continuous interstitial monitoring located at low elevation points along pipeline; ➢ Double -walled piping with translucent or transparent sections located at low points or low endpoints so that visual monitoring is possible; ➢ Troughs or pipe runs with impermeable liners that incorporate the following: • Continuous electronic leak detection monitoring for releases; or • Sumps located at low elevations with leak detection monitors; or UN -047 - 4/14 www.unldocs.org 02/01/07