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IR it <br /> 4 <br /> identification system placards developed by the National Fire <br /> Prevention Association (NFPA) . <br /> (e) Valves on hazardous waste storage tanks shall be kept locked <br /> when the facility is unattended. <br /> 3. Storage in ponds. <br /> (a) The following hazardous wastes shall not be stored in open storage <br /> ponds: <br /> (1) Extremely hazardous wastes as defined in Sections 66064 and <br /> 66685, Title 22, California Administrative Code, unless <br /> specifically approved by a written permit from the California <br /> State Department of Health Services; <br /> (2) Flammable wastes as defined in Section 66072, Title 22, <br /> California Administrative Code; and <br /> (3) Wastes such as organic solvents or sludges containing vola- <br /> tile, toxic substances in excess of 10 percent by weight. <br /> (b) Hazardous sludges, concentrates, and residues removed from a <br /> storage pond for subsequent disposal shall be properly handled, <br /> transported, and disposed of as hazardous wastes. <br /> (c) Physical barriers or other devices shall be used as necessary <br /> during waterfowl migration periods to deter migratory waterfowl <br /> from using storage ponds. <br /> 4. Storage in containers. <br /> (a) Containers used for storing hazardous waste shall be in a condi- <br /> tion such that the containers can be safely transported, handled <br /> or moved. <br /> (b) Areas used for storing containers of hazardous waste shall be <br /> widely separated, or physical barriers shall be provided to <br /> ensure that commingling of incompatible hazardous wastes cannot <br /> occur if a container on one pad ruptures. <br /> (c) A label shall be maintained on all containers in which hazardous <br /> wastes are stored for 90 days or more and records for the storage <br /> of all hazardous wastes shall be maintained pursuant to Section <br /> 66545, Title 22 of the California Administrative Code. Labels <br /> shall include the following information: <br />