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gaps, in order to contain leaks and spills. Liquid materials should be stored in UL approved double walled tanks or surrounded by a curb or dike to provide the volume to contain 10 percent of the volume of all of the containers or uo percent of the volume of the largest container, whichever is greater. The area inside the curb should slope to a drain. For used oil or dangerous waste, a dead-end sump should be installed in the drain. All other liquids should be drained to the sanitary sewer if available. The drain must have a positive control such as a lock, valve, or plug to prevent release of contaminated liquids. Accumulated stormwater in petroleum storage areas should be passed through an oil/water separator. Maintenance is critical to preventing leaks and spills. Conduct routine inspections and: Check for external corrosion and structural failure. Check for spills and overfills due to operator error. Check for failure of piping system (pipes, pumps, flange, coupling, hoses, and valves). Check for leaks or spills during pumping of liquids or gases from truck or rail car to a storage facility or vice versa. Visually inspect new tank or container installation for loose fittings, poor welding, and improper or poorly fitted gaskets. Inspect tank foundations, connections, coatings, and tank walls and piping system. Look for corrosion, leaks, cracks, scratches, and other physical damage that may weaken the tank or container system. Frequently relocate accumulated stormwater during the wet season. Periodically conduct integrity testing by a qualified professional. Vehicle Leak and Spill Control Major spills on roadways and other public areas are generally handled by highly trained Hazmat teams from local fire departments or environmental health departments. The measures listed below pertain to leaks and smaller spills at vehicle maintenance shops. In addition to implementing the spill prevention, control, and clean up practices above, use the following measures related to specific activities: Vehicle and Equipment Maintenance Perform all vehicle fluid removal or changing inside or under cover to prevent the run-on of stormwater and the runoff of spills. Regularly inspect vehicles and equipment for leaks, and repair immediately. Check incoming vehicles and equipment (including delivery trucks, and employee and subcontractor vehicles) for leaking oil and fluids. Do not allow leaking vehicles or equipment onsite. Always use secondary containment, such as a drain pan or drop cloth, to catch spills or leaks when removing or changing fluids. Immediately drain all fluids from wrecked vehicles. Store wrecked vehicles or damaged equipment under cover.