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generates waste at multiple addresses, each address needs a separate identification number. All hazardous waste transporters and permitted treatment, storage and disposal facilities (TSDFs) must have an identification number. Hazardous waste generators must have an identification number (section 66262.12) unless you generate only silver waste less than or equal to 100 kg per month. (Health & Saf. Code, sections 25160.2 (b) (10) and 25160.2 (e)). Handlers of federally -regulated RCRA waste who need an identification number should contact the U.S. EPA at 415-495-8895. Handlers of State regulated hazardous waste who do not need the federal number should contact DTSC's Generator Information Services Section (GISS) at 800-618-6942. (Section 66262.12.) Out -of -State callers should call 916-255- 1136 to obtain an identification number. There is no fee to obtain an identification number. However, every generator number is subject to an annual verification, and for those with 50 or more employees a verification fee is assessed. (Health & Saf. Code, section 25205.16.) For more detailed explanation on identification numbers, read DTSC's Fact Sheet "EPA Identification Numbers" (September 2000). C. ACCUMULATION (1) Hazardous waste may be accumulated onsite in generator accumulation units (containers, tanks, drip pads, or containment buildings) only in compliance with the applicable time limits specified in Health & Saf. Code, section 25123.3 (90 days, 180 days, 270 days or 365 days). (Section 66262.34.) (2) If hazardous waste is accumulated in containers, a generator must comply with Title 22, Cal. Code Regs., division 4.5, chapter 15, article 9 (Use and Management of Containers). These requirements include: (a) Placing containers holding ignitable or reactive wastes at least 15 meters (50 feet) from the facility's property line. (Section 66265.176.) (b) Not placing incompatible waste streams into the same container. (Section 66265.177.) (c) Separating a container holding a hazardous waste that is incompatible with any waste or other materials transferred or stored nearby in other containers, piles, open tanks, or surface impoundments from the other materials or protecting them by means of a dike, berm, wall, or other device. (Section 66265.177.) (3) Maintaining all containers so that they are: (a) in good condition (Section 66265.171); (b) compatible with contents (Section 66265.172); (c) closed, except when adding or removing hazardous waste (Section 66265.173); (d) managed to avoid rupture or leaks (Section 66265.173); (e) inspected weekly (Section 66265.174); and (f) properly labeled (Section 66262.34). (4) While DTSC does not require secondary containment for a generator's hazardous waste containers, local codes may require it. (5) If hazardous waste is accumulated in tanks, a generator must comply with Title 22, Cal. Code Regs., division 4.5, chapter 15, article 10 (Tank Systems Standards) except for Sections 66265.197 (c) and 66265.200. These requirements include maintaining all tanks so that the tanks are: (a) inspected daily (Section 66265.195); (b) properly labeled (Section 66262.34); and (c) designed to hold hazardous waste and not collapse or leak. (Section 66265.192.) Most tanks and tank systems must have secondary containment. Secondary containment can include a liner, vault or double -walled tank. Appurtenances also must be contained. Secondary containment needs to be certified by a professional engineer registered in California. (Section 66265.191- 66265.196.) (6) If hazardous waste is placed on drip pads, the generator must comply with Title 22, Cal. Code Regs., division 4.5, chapter 15, article 17.5 (Drip Pads) and maintain the following records at the facility: (a) a description of procedures that will be followed to ensure that all wastes are removed from the drip pad and associated collection system at least once every 90 days; and (b) documentation of each waste removal,