Aboveground storage tank requirements

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T ASTs installed on or after November 2, 1998, need Annual equipment checks to maintain leak detection or secondary containment constructed of: monitoring and warning equipment must be done. This includes function and calibration checks in accordance • compacted clay(12 inches thick with a permeability with manufacturer's guidance. of 1 x 10-�cm./sec. and has a cover material to prevent drying and erosion)that is designed and American Petroleum Institute(API)external inspections certified by a registered professional engineer of field-erected ASTs were required by November 2, 2003, or five years after the initial construction date, • concrete whichever is later. • a synthetic membrane Maintenance • a geosynthetic clay liner • the outer shell of a double-walled tank Owners and operators must minimize rust on the tank exterior and must dispose of water drawn from the • the lower bottom of a double-bottomed tank bottom of the tank in accordance with any state and federal regulations. • fabricated steel • fiberglass The secondary containment area must be kept free of cracks, open seams, open drains, siphons, and vegetation Tanks installed prior to November 2, 1998, were other than grass. Grass is used to reduce erosion. required to have a dike(could be made of soil) preventing release to surface water by'November 1, Precipitation must be removed as often as possible to 1998. By November 1, 2003,the containment area had maintain proper containment area volume. If to meet a minimum permeability standard based upon precipitation exists in the containment area,the tank the product type being stored, distance from surface volume must be reduced to maintain the 100 percent water, and depth to groundwater. For questions about capacity of the largest tank in the containment area. these requirements, see the"Permeability Testing Guidance for Secondary Containment Areas"fact sheet. Stormwater that collects in the containment area must be discharged according to state and federal regulations. Monitoring Safeguard systems must be installed and maintained For other regulated substance ASTs, someone must be according to the manufacturer's schedules and standards. present to visually monitor loading and unloading of product and be able to shut off product transfer before an Record keeping overfill occurs. For the life of the tank A visual inspection for tank releases must be conducted Owners or operators of other regulated substance ASTs at least every 72 hours if the containment area does not must keep for the life of the tank all tank system design meet the standards for tanks installed on or after records including maintenance and repair November 2, 1998. If the containment area meets the documentation,third-party certifications, and as-built standards for ASTs installed after this date,the drawings. inspection must be conducted at least weekly. All containment area evaluations for soil permeability if the tank is double-walled,the inspection must be must be kept for the life of the tank. These evaluations conducted at least monthly. should include soil classification, soil description, sample logs,tables for individual permeability tests, and On a monthly basis, a visual inspection for both new and the hydraulic conductivity of the soil. existing tanks is required. This inspection must include a walk through of the site to identify cracks in the Records for external inspections of field-erected tanks secondary containment area. Visual examination of the must be retained for the life of the tank system. exterior surfaces of tanks, piping, valves, pumps, and other equipment for cracks, corrosion,releases, and maintenance deficiencies must also be conducted. The monthly inspection must also identify poor maintenance, operating practices, or malfunctioning equipment. Other Regulated Substance Requirements for MfnnesoW Pollution Aboveground Storage Tank • t-a2-07 • Aprtl 2004 CO�ro1��y Page 2