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Hazardous Waste Tank System Requirements for LQGs and Onsite Treatment Facilities —Page 2 of 14 Existing Tank System or Existing Tank Component – Means a tank system or component used for the transfer, storage, or treatment of hazardous waste and that was in operation, or for which installation had commenced on or prior to the following dates: • 7/14/1986 for tanks holding RCRA waste if the owner/operator is a LQG and is not exempted from the requirements of 40 CFR Part 264 or 265 per 40 CFR §264.1 or 265.1; • 7/1/1991 for tanks holding Non-RCRA hazardous waste; • 7/1/1991 for tanks containing RCRA hazardous waste if the owner/operator is exempted from the requirements of 40 CFR Part 264 or 265 per 40 CFR §264.1 or 265.1 but is still subject to the requirements of 22 CCR, Division 4.5, Chapter 15, Article 10; ➢ Large Quantity Generator (LQG) – Means a hazardous waste generator who generates in a calendar month: 1,000 kilograms (2,205 pounds) or more of hazardous waste, including non-RCRA (i.e., California regulated only) wastes such as used oil; or 1 kilogram of acutely hazardous waste (AHW) or 100 kilograms of debris resulting from the spill of an AHW. Or a generator who accumulates on-site more than 6,000 kilograms (13,228 pounds) of hazardous waste at any one time. ➢ New Tank System or New Tank Component – Means a tank system or component used for the transfer, storage, or treatment of hazardous waste and that is not an existing tank system or component. ➢ Non-RCRA Hazardous Waste – Means a waste regulated as hazardous waste by California, but not by the federal Resource Conservation and Recovery Act (RCRA). Examples include used oil and waste antifreeze. ➢ RCRA Hazardous Waste – Means a waste identified as hazardous pursuant to the Resource Conser- vation and Recovery Act in 40 CFR, Chapter 1, Subchapter I, Part 261, and applicable appendices. ➢ Small Quantity Generator (SQG) – Means a generator of hazardous waste who generates less than 1,000 kilograms of hazardous waste, including non-RCRA wastes such as used oil, per month. • Tank – Means a stationary device designed to contain an accumulation of hazardous waste, which is constructed primarily of non -earthen materials (e.g., wood, concrete, steel, plastic) which provide structural support. • Tank System – Means a hazardous waste transfer, storage, or treatment tank and its associated ancillary equipment and containment system. C. Secondary Containment' 1. General — Secondary containment systems for tanks must consist of double-wall tanks, vault systems, external liner systems, or equivalent devices approved by DTSC. 122CCR §66265.193(d)I 2. Aboveground Tanks Holding Non-RCRA Hazardous Waste or RCRA-Exempt Waste, or Tiered Permit Tank Systems — The following types of tank systems must be provided with secondary containment meeting the requirements of 22 CCR §66265.193(1). 122CCR §66265.193(1)(3)1 ➢ Systems containing non-RCRA hazardous wastes generated onsite; 122CCR §66265.193(j)(2)(A)1 ➢ Onsite treatment unit tank systems authorized under the following tiers: [22CCR §66265.1930)(2)(A)I • Conditional Exemption (CE) if the facility is a LQG; • Conditional Authorization (CA); • Permit -by -Rule (PBR). ➢ Systems containing RCRA hazardous wastes generated onsite if 40 CFR §265.1 exempts the owner/operator from the requirements of 40 CFR Part 265 2 [22CCR §66265.193(i)(2)(R)(2)1 ' All deadlines for retrofitting existing systems have passed. Those deadline dates are listed in Table 1, at the end of this document. UN -047 - 2114 www.unidocs.osg 02101107