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. . � . . . . �� . � , � ' • ; {• • ��+��ra .. - . srr.� r�k �n� rra�-�n�r • i � � � - March 31,2003 - . . �:,.��:�' _ . Page 4 of 5 ' ' " -' Additional requirements for UL 142 or 921.AS`�''s UL 142 (single wall) or UL 921 (double walled) above ground storage tanks are plain steel tanks. These tanks are not constructed to be fire resistive and thus have requirements for separation between the tank and buildings and also between the tank and dispenser. This page covers the additionalrequirements for single and double wall plain steel U�. 142 or UL 921 tanks. Note the separation required between the tank and b�ild'ztags plus the se�aration rec�uired between tank 1. A maximum of three ASTs are allowed for dispensing at any single dispensing site. AST shall not exceed 6,000 gallons individual capacity for Class I liquids (gasoline) and 10,000 gallons individual capacity for Class II liquids (diesel fuel). 2. ASTs shall be separated from the dispenser by at least 30 feet. Exceptions: 1. Operations not open to the public and for resort operations serving registered guests only, dispensing of Class I liquids from one AST of S60 gallons capacity or less may have the dispenser located on top of, oradjacentto, the AST. 2. Operations not open to the public and for resort operations serving registered guests only, dispensing of Class II liquids from two AST of 1,000 gallons individual capacity or less may have the dispenser located on top of, or adjacent to, the AST. 3. Tanks shall be located not less than 50 feet from the nearest side of a public way, property line, building, or combustible storage located on the same property and at least 3 feet from adjacent tanks. Exception: ASTs which are separatedby 30 feet or more from the dispenser may reduce the distances between the AST and the public way, property line, building, or combustible storage to 30 feet. 4. Fuel delivery shall be from the top of the AST with the dispensing line equipped with an approved antisyphon system. 5. Dispensing lines between a diked area or AST and a dispenser sha1l be located underground and shall be in an approved secondary containmentpiping system. 6. Dispensing lines shall have an approved normally closed solenoid valve at each dispenser below the impact valve. 7. Fill pipes between a diked area or AST and the fill pipe opening shall be located underground. The fill pipe shall also be equipped with manually operated mechanical shut-off valve located inside the diked area, but can be operated from outside the dike. 8. ASTs shall be grounded as specified in National Fire Protection Assoczation (NFPA) Standard 780, Lightning Protection Code (1997 Edition).