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certified by a civil engineer registered in California <br /> to be structurally sound and of adequate construction <br /> for the intended use. <br /> d. Each hazardous waste tank and storage area shall be <br /> individually marked with the internationally <br /> recognized hazard identification system placards <br /> developed by the National Fire Prevention Association. <br /> e. The total volume of hazardous waste stored in tanks <br /> shall not exceed the designed capacity. <br /> 2. Containment <br /> a. For all containment areas, the owner or operator shall <br /> provide a spill containment system in accordance with <br /> the approved Operation Plan. Specifically, each <br /> hazardous waste storage area shall have a continuous <br /> base that is impervious to the waste stored, shall be <br /> designed and constructed so that any spills can be <br /> contained, and shall have sufficient capacity to <br /> contain ten percent of the total volume of the tanks <br /> or the volume of the largest tank, whichever isl <br /> greater. <br /> b. In addition to the requirements of item (a) above, <br /> outdoor uncovered containment areas shall contain all <br /> surface water runoff, exclude all surface water runon, l <br /> and contain precipitation from a 24-hour, 25-year <br /> storm. <br /> c. Spills, leaks, and precipitation shall be promptly <br /> removed from the containment area to prevent overflow. <br /> 3. Operation <br /> � • F:: •'� `i-r .sem; �'- <br /> a. Hazardous wastes sha'l'l': no` b �+laEe ;Fin sa�tank if the <br /> could cause fhe'$ank's. Es_ lrner � ure, leak <br /> corrode, or otherwise fail=:,_befor - th end of it <br /> intended life. <br /> b. Valves on hazardous waste storage tanks shall be kept <br /> locked when the facility is unattended. <br /> c. There shall be no underground tanks at the facility. <br /> D. Recvcling Conditions <br /> Ooerations and maintenance of the recycling system shall b,ie <br /> conducted in accordance with all sections of the approved <br /> Operation Plan. <br /> 1. The mixing and blending of potentially incompatible <br /> materials and wastes for purposes of recovering resources!, <br /> neutralizing wastes, to detoxifying wastes shall be carried <br /> -ll- <br />