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Hazardous Waste Tank System Requirements for LQGs and Onsite Treatment Facilities — Page 3 of 14 Secondary containment for these tank systems must satisfy the requirements of 22 CCR §66265.193(e) and consist of double-wall tanks, vault systems, external liner systems, or equivalent devices approved by DTSC; or consist of any device or combination of devices as approved in writing by the local Certified Unified Program Agency (CUPA), which is: 122CCR §66265.193(01 ❑ Designed, installed, and operated to prevent any migration of wastes or accumulated liquid out of the system to the soil, ground water, surface water, or air at any time during the use of the tank system; 122CCR §66265.193(1)(1)1 ❑ Capable of detecting and collecting releases and accumulated liquids until the collected material is removed. 122CCR §66265.193(1)(2)1 3. Aboveground Tanks Holding RCRA Hazardous Waste and UST Systems — For the following types of tank systems, the requirements of 22 CCR 66265.1930) do not apply: ➢ Aboveground tank systems containing RCRA hazardous wastes generated onsite when the owner/operator is subject to the requirements of 40 CFR Part 265; ➢ Underground storage tank systems. For these tanks, secondary containment systems must be provided which are: 122CCR §66265.193(.)1 ❑ Designed, installed, and operated to prevent any migration of wastes or accumulated liquid out of the system to the soil, ground water, or surface water at any time during the use of the tank system; 122CCR §66265.193(b)(1)I ❑ Capable of detecting and collecting releases and accumulated liquids until the collected material is removed; 122CCR §66265.193(b)(2)l ❑ Constructed of or lined with materials that are compatible with the waste(s) to be placed in the tank system and have sufficient strength and thickness to prevent failure due to pressure gradients, physical contact with the waste to which they are exposed, climatic conditions, the stress of installation, and the stress of daily operation (including stresses from nearby vehicular traffic); 122CCR §66265.193(c)(1)I ❑ Placed on a foundation or base capable of providing support to the secondary containment system and resistance to pressure gradients above and below the system and capable of preventing failure due to settlement, compression, or uplift; (22CCR §66265.193(c)(2)1 ❑ Provided with a leak detection system that is designed and operated so that it will detect the failure of either the primary and secondary containment structure or any release of hazardous waste or accumulated liquid in the secondary containment system within 24 hours; 122CCR §66265.193(c)(3)l ❑ Sloped or otherwise designed or operated to drain and remove liquids resulting from leaks, spills, or precipitation. (22CCR §66265.193(c)(4)l 4. Double -Wall Tanks — Double-wall tanks must be: 122CCR §66265.193(e)(3)1 ❑ 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; ❑ Protected, if constructed of metal, from both corrosion of the primary tank interior and the external surface of the outer shell; and 2 Exemptions in 40 CFR §265.1(c) include, but are not limited to, exemptions for: SQGs; transfer facilities, publicly owned treatment works (POTW) facilities; some municipal or industrial solid waste facilities; some facilities that manage recyclable materials; some Universal Waste handlers; and certain elementary neutralization units or wastewater treatment units. UN -047 - 3/14 www.unidoes.org 02/01/07