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Hazardous Waste Tank System Requirements for LQGs and Onsite Treatment Facilities —Page 9 of 14 ❑ The tank system secondary containment must be provided with a leak detection system designed and operated so that it will detect either the failure of the primary and secondary containment structure or any release of hazardous waste or accumulated liquid in the secondary containment system within 24 hours. [22CCR§66265.192(j)(3)] ❑ Prior to placing the tank system in service, the owner/operator must submit the following information to the CUPA for review and obtain CUPA approval: [22CCR§66265.192(j)] ❑ A request for temporary exemption from the written assessment requirement with information showing that the conditions of 22 CCR §66265.1920)(1) through (3) have been met; (Note: a Hazardous Waste Tank System Written Assessment Temporary Exemption Application form is available at www.unidocs.org) ❑ Documentation of local agency approval of the tank system design and installation. The CUPA may grant an extension for up to three (3)years. [22CCR§66265.192(])] Note(s): (1)Some CUPAs that grant extensions allow owners/operators to apply for a new extension before the current extension expires. Contact your CUPA regarding their requirements. (2)It is recommended that hazardous waste generators whose status changes from SQG to LQG due to an increase in the quantity of waste generated request this extension from their CUPA to avoid being in violation while the written tank system assessment is prepared. 5. Existing Tank Systems — Owners/operators of existing tank systems that did not have secondary containment meeting the requirements of 22 CCR §66265.193 at the time the tanks were installed were required to obtain a written tank system assessment in accordance with §66265.191 by the deadlines specified in Table 3 (at the end of this document). [22CCR§66265.191(a)] If, as a result of an assessment the tank system is found to be leaking or unfit for use, the owner or operator must remove the tank from service as required by 22 CCR §66265.196. [22CCR§66265.191(d)] The assessment is valid for a period of one (1) year from the date of certification. It must be reviewed and recertified by a PE before the current certification expires. [22CCR§66265.191(e)(1)] The current assessment must be kept on file at the facility. [22CCR§66265.191(e)(1)] An existing tank system that had secondary containment meeting the requirements of 22 CCR §66265.193 before 7/1/1991 is not required to have a written tank system assessment unless the system is modified. Per USEPA and DTSC, if such a system is modified, it is subject to the requirements for new tank systems. F. Installation of New Tank Systems and Components 1. Installation Requirements The owner/operator must ensure that proper handling procedures are adhered to in order to prevent damage to the system during installation. [22CCR§66265.192(b)] New tank systems or components and piping that are placed underground and that are backfilled must be provided with a backfill material that is a noncorrosive, porous, homogeneous substance and that is carefully installed so that the backfill is placed completely around the tank and compacted to ensure that the tank and piping are fully and uniformly supported. [22CCR§66265.192(c)] UN-047-9/14 www.unidoes.org Rev.01/07/08