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• Construction materials of the tank and in the area immediately <br /> surrounding the tanks (e.g., dikes) must be checked at least weekly to <br /> detect corrosion or leaking <br /> ■ Discharge control equipment must be inspected at least once each <br /> operating day <br /> • Data must be gathered from monitoring equipment at least once each <br /> operating day to ensure that the tank is being operated according the <br /> its design <br /> • Level of waste in the tank is checked at least once each operating day <br /> ➢ Secondary Containment: <br /> o LQGs: Most tanks and tank systems must have secondary containment. <br /> Secondary containment can include a liner,vault or double-walled tank. <br /> Appurtenances also must be contained. Secondary containment needs to <br /> be certified by a professional engineer registered in California. Secondary <br /> containment systems must be able to contain 100% of the capacity of the <br /> largest tank plus rainwater (if outside) from a 25-year,24-hour rainfall. <br /> ➢ Waste Feed Cutoff: <br /> o SQGs: Where hazardous waste is continuously fed into a tank, the tank <br /> must be equipped with a means to stop this inflow (e.g., waste feed cutoff <br /> system or by-pass system to a stand-by tank). <br /> If hazardous waste is accumulated in underground storage tanks (USTs), please contact <br /> your Environmental Coordinator to obtain the federal and state requirements and <br /> instructions on proper management. <br /> Empty Container Management <br /> A container or an inner liner removed from a container that has held any hazardous <br /> waste is California"empty' if: <br /> 1) All wastes have been removed that can reasonably be removed by inverting <br /> the container or chipping it out;OR <br /> 2) For containers that held an acute hazardous waste, the container or inner <br /> liner has been triple rinsed using a solvent capable of removing the waste and <br /> all pourable residues have been removed. NOTE: Triple rinsing activities <br /> shall require specific authorization from the DTSC unless subject to the <br /> provisions of HSC 25143.2(c)(2). <br /> Under California law, there are three standards for empty containers, depending on the <br /> type of material that is held by the container. In short, it must not be possible for any <br /> 8of13 <br />