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ii SKr r .LCTj Part II Products• C. Dimensional Requirements 5. The double-wall tank 2.01 Double-Wall Fiberglas® (refer to O/C TANKS litera- monitor shall be capable Underground Storage Tanks ture on gallonage): of detecting a breach in A. Loading Conditions Tank 1. Nominal capacity of the the inner and/or outer shall meet the following tank shall be—gallons. tank under the following design criteria: 2. Nominal outside diameter installed conditions: 1. External hydrostatic pres- of the tanks shallbe_feet. a. When the inner tank sure. Buried in ground with 3. Nominal overall length of is empty. 7'of overburden over the the tanks shall befeet. b. When the inner tank is top of the tank, the hole partially or completely fully flooded and a safety D. Monitoring Capabilities: full and the groundwater factor of 5:1 against general 1. Tanks shall have a space table is below the tank buckling. between the primary and bottom. 2. Surface loads: When secondary shell walls to c. When the inner tank is installed according to manu- allow for the free flow and partially or completely facturer's installation instruc- containment of all leaked full and the tank is par- tions tanks will withstand product from the primary tially or completely sub- surface H-20 axle loads tank. merged in groundwater. (32,000 lbs./axle). 2. The following continuous 6. The leak detection perfor- 3. Internal load: Primary and monitoring conditions shall mance of the monitoring secondary tanks shall with- be compatible with the system shall be tested stand 5 psi air pressure test cavity between the inner and verified by a qualified with 5:1 safety factor. and outer tanks: independent consultant to 4. Tanks shall be designed to • Vented to atmosphere detect leaks as small as support accessory equip- • Sealed tank cavity 0.05 gallons per hour with a ment such as heating coils, • Vacuum-3" mercury 95% probability of detection ladders, drop tubes, etc. maximum (1.5 psi and less than a 5% proba- when installed according to maximum) bility of a false alarm. manufacturer's recommen- • Positive air pressure 7. All monitoring equipment, dations and limitations. (3 psi maximum) including FRP reservoirs • Hydrostatic pressure— and electronic control shall B. Product Storage 7 foot maximum ground- be U.L. listed. Requirements: water head pressure over 8. If hydrostatically monitored, 1. All primary tanks must be tank top. any solution used in the vented. Tanks are designed 3. Tanks shall have an tank annular space shall for operation at atmospheric integrally-mounted reser- have U.L. approval for pressure only, except for voir installed on the tank for compatibility with the tank. use with vapor recovery optional hydrostatic moni- systems at a pressure or toring. The reservoir shall vacuum of approximately be constructed of fiberglass 1 psi. reinforced plastic materials 2. Tanks shall be capable of and warranted for 30 years storing liquids with specific against failure due to gravity up to 1.1. internal/external corrosion 3. Maximum temperature: and,when properly installed, Tank shall be capable of against structural failure storing gasoline, alcohol (same as tank warranty). blended gasoline (with 4. Tank shall be designed with up to 100% methanol or access to the tank bottom ethanol), oxygenated fuels between the primary and (up to 20% MTBE), av-gas, secondary walls (annular jet fuel, motor oil (new or space). All tanks shall have used), kerosene, diesel fuel one 4" NPT monitoring fit- or potable water at ambient ting in the reservoir(6" NPT underground temperatures for 10'diameter tanks).Tanks not to exceed 150°F at the 4,000 gallon capacity and tank interior surface. larger shall also have one 4. Tanks shall be chemically additional 4" NPT monitor- inert to petroleum products. ing fitting.