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LEAK TESTING METHOD (LTM) — a point in time test method to determine if an AST is liquid right. Leak testing is not preventive in the sense that it provides an indication only if the AST integrity has already been breached. Therefore, it may be used as a tank integrity measure or as a supplement to other inspection procedures. LTMs may include the following technologies: • Gas pressure decay (includes vacuum decay) • Gas pressure soap bubble testing • Gas tracers (e.g., helium tracer) • Soil tracers (chemical marker) • Mass measurement • Level measurement • Hydrostatic test PERIODIC AST INSPECTION - a visual, documented inspection conducted by an owner's inspector, to assess the general AST conditions, as best as possible, without suspending AST operations or removing the AST from service. RELEASE PREVENTION BARRIER (RPB) — a liquid containment barrier that is sufficiently impervious to the liquid being stored and is installed under the AST. Its purpose is to divert leaks toward the perimeter of the AST where they can be easily detected as well as to prevent liquid from contaminating the environment. RPBs are composed of materials compatible with the liquid stored in the AST and meet proper engineering standards. Examples are steel (such as in steel double -bottom tanks), concrete, elastomeric liners, or other suitable materials provided the above criteria are met. SECONDARY CONTAINMENT AST — an AST which is either a double-wall AST, or an AST with an integral secondary containment dike. These integral secondary containment dikes may be pans, boxes or containers and are designed to contain the contents of the primary tank if the primary tank fails. A secondary containment AST may be open or closed to the atmosphere. If precipitation cannot readily enter the integral secondary containment, then the containment need only be sized for the primary tank volume. If precipitation can enter the secondary containment, then the secondary containment is sized to contain the primary tank volume and with sufficient freeboard to contain precipitation. SHOP -FABRICATED — a welded metal AST fabricated in a manufacturing facility or an AST not otherwise identified as field -erected with a volume less than or equal to 50,000 U.S. gallons (189,271 liters). SPILL CONTROL - a means of preventing a release of liquid to the environment including adjoining property and waterways. Methods include the following: • Remote impounding • Secondary containment dikelberm • Secondary containment AST • Secondary containment system SUFFICIENTLY IMPERVIOUS - Sufficient resistance to diffusion and transport of hydrocarbon or other chemical substances to prevent contamination of the environment until clean-up occurs. Determination of "sufficiently impervious" is a technical consideration that a Professional Engineer or other qualified professional (such as Professional Geologist, Environmental Professional, etc.) must make. This determination is to be based on sound technical considerations, the site specific conditions, as well as risk based considerations, such that ground and groundwater contamination is prevented, using current normally accepted engineering practices and principles. Sufficiently impervious does not necessarily mandate the use of a liner. Additional information about liners is found in API 341, A Survey of Diked -area Liner Use at Aboveground Storage Tank Facilities. R