above ground storage tank glass-fused-to-steel tanks wastewater storage tanks ABOVE GROUND STORAGE TANK This is a permit application for individuals or contractors that wish to install a temporary above ground storage tank of flammable or combustible liquids. If every above ground storage tank at the facility has adequate secondary containment, the worst case planning volume equals the capacity of the largest single above ground oil or hazardous substance storage tank. The image to the left represents the above ground storage tank. The current above ground storage tank will be replaced with a 1000-gallon concrete double-walled tank. If the tank is older than that or the age is unknown, replace it with an above ground storage tank. Unprotected underground steel tanks older than 25 years of age are to be replaced with the type of underground tank listed above or an acceptable above ground storage tank system. Because of the higher cost, runoff should be minimized and flush systems should not be considered if an above-ground storage tank is needed. All temporary above ground storage tank permits shall have a specific expiration date not to exceed. a one year maximum. The floor of an above ground storage tank is impossible to inspect using conventional methods with the tank still in-service. Double-walled above ground storage tank. There are currently five tanks in the above ground storage tank area, two of which have been decommissioned, according to the site owner. Above ground storage tank owners need a reliable way to measure and calculate tank. A typical domestic setup consists of a well pump that lifts the water from the well and pumps it into an above ground storage tank.