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including the quantity of waste removed, the sump or collection system and the date and time of removal. If hazardous waste is accumulated in containment buildings, the generator must comply with Title 22, Cal. Code Regs., division 4.5, chapter 15, article 29 (Containment Buildings), and obtain a professional engineer certification that the building complies with the design standards specified in Section 66265.1101. The engineer certification is required prior to operating the unit and must be placed in the facility's operating record. (Section 66262.34 (a) (1) (C)). (7) The owner or operator of a containment building must maintain the following records at the facility: (a) a written description of procedures to ensure that each waste volume remains in the unit for no more than 90 days, a written description of the waste generation and facility management practices showing that they are consistent with the 90 day limit, and documentation that the procedures are complied with (Section 66262.34 (a) (1) (C) (1)); or (b) documentation that the unit is emptied at least once every 90 days. (Section 66262.34 (a) (1) (C) (2)). (8) A generator accumulating in tanks or containers is exempt from articles 7 and 8 in Title 22, Cal. Code Regs., division 4.5, chapter 15, except Sections 66265.111 (Closure Performance Standards) and 66265.114 (Decontamination). (Section 66262.34 (a)(1)). For a more detailed explanation on accumulation requirements, read DTSC's "Accumulating Hazardous Wastes at Generator Sites" Fact Sheet (January 2002). D. LABELING/MARKING (1) The date upon which each period of accumulation begins must be clearly marked and visible for inspection on each accumulation unit. (Section 66262.34.) (2) While being accumulated on site, each generator tank or container must be labeled or clearly marked with the words, "Hazardous Waste." (Section 66262.34.) (3) Each container and portable tank in which hazardous waste is accumulated must be labeled with the following information: (a) composition and physical state of the waste; (b) statement or statements that call attention to the particular hazardous properties of the waste (e.g. flammable, reactive); and (c) name and address of the generator. (Section 66262.34.) (4) Containers and tanks used by the generator to collect or consolidate wastes initially accumulated in other containers or tanks are subject to the same labeling requirements. The initial accumulation and "90 -day period" dates on the "collection" container/ tank must be the oldest of the initial accumulation and "90 -day period" dates from the various containers/tanks emptied into the "collection" container/tank. This may require dates to be changed if wastes from "older" containers/tanks are added to the "collection" container/tank. (5) In some cases, containers are continuously reused for accumulation of the same waste stream; e.g., drums used to initially accumulate waste which when full are emptied into larger "collection" containers. "Recurring use" labels may be used on such contain- ers to revise the initial accumulation and "90 -day period" dates (without having to change the other labeling information). If the container is emptied at least once each day, the word "daily" may be used in the date area of the label. E. EMERGENCY PROCEDURES/ CONTINGENCY PLANS (1) ALL GENERATORS All generators must comply with these requirements regarding preparedness and prevention: (a) All operations must minimize the possibility of a fire, explosion or any unplanned release of hazardous waste or hazardous waste constituents to air, soil, or surface water that could threaten human health or the environment. (40 CYR. section 265.3 1, Section 66265.31) (b) A generator's site must be equipped with the following, unless it can be demonstrated to DTSC