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reaches 15 years of age, or within two years of January 12, 1987, whichever <br /> comes later; <br /> (B) subsection (a)(4)(A) of this section applies to existing tank systems <br /> containing RCRA hazardous wastes, unless: <br /> 1. the owner or operator is a conditionally exempt small quantity generator or a <br /> 100 to 1000 kg per month generator, or <br /> 2. the owner or operator is not subject to regulation in 40 CFR part 265 <br /> pursuant to an exemption in 40 CFR section 265.1. <br /> (5)(A) for those existing tank systems described in subsection (a)(5)(B) of this <br /> section for which the age cannot be documented, within eight years from July 1, <br /> 1991; but if the age of the facility is greater than seven years as of July 1, 1991, <br /> secondary containment shall be provided by the time the facility reaches 15 <br /> years of age, or within two years from July 1, 1991 , whichever comes later; <br /> (B) subsection (a)(5)(A) of this section applies to: <br /> 1. existing tank systems containing only non-RCRA hazardous wastes, and <br /> 2. existing tank systems containing RCRA hazardous wastes, if: <br /> a. the owner or operator is a conditionally exempt small quantity generator or a <br /> 100 to 1000 kg per month generator, or <br /> b. the owner or operator is not subject to regulation in 40 CFR part 265 pursuant <br /> to an exemption in 40 CFR section 265.1, but the owner or operator is subject to <br /> the standards of this article. <br /> (6) for tank systems that transfer, store or treat materials that become hazardous <br /> wastes subsequent to the dates indicated below, within the time intervals <br /> required in subsections (a)(1) through (a)(5) of this section, except that the date <br /> that a material becomes a hazardous waste shall be used in place of the dates <br /> indicated below where these dates appear in subsections (a)(1) through (a)(5) of <br /> this section: <br /> (A) January 12, 1987, for tanks containing RCRA hazardous wastes, unless: <br /> 1. the owner or operator is a conditionally exempt small quantity generator as <br /> defined in 40 CFR section 261.5, or a 100 to 1000 kg per month generator as <br /> defined in 40 CFR section 265.201, or <br /> 2. the owner or operator is not subject to regulation in 40 CFR part 265 pursuant <br /> to an exemption in 40 CFR section 265.1; <br /> (B) July 1, 1991 , for: <br /> 1. tanks containing only non-RCRA hazardous wastes, and <br /> 2. tanks containing RCRA hazardous wastes, if: <br /> a. the owner or operator is a conditionally exempt small quantity generator or a <br /> 100 to 1000 kg per month generator, or <br /> b. the owner or operator is not subject to regulation in 40 CFR part 265 <br /> pursuant to an exemption in 40 CFR section 265.1, but the owner or operator is <br /> subject to the standards of this article. <br /> (b) Secondary containment systems shall be: <br /> (1) designed, installed, and operated to prevent any migration of wastes or <br /> accumulated liquid out of the system to the soil, ground water, or surface water at <br /> any time during the .use of the tank system; and <br />