NORTHERN SONOMA COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 482 - PETROLEUM LOADING AND STORAGE

1. All petroleum storage tanks in excess of 40,000 gallons capacity shall conform with the requirements of Rule 490.
   
   
2. No person shall install or maintain any stationary gasoline tank with a capacity of 250 gallons or more which is not equipped for loading through a permanent submerged fill pipe. (H&S 41950)
   
   
   1. For the purpose of Rule 482(b) "gasoline", means any petroleum distillate having a Reid vapor pressure of four pounds or greater.
      
      
   2. For the purpose of Rule 482(b) "submerged fill pipe", means any fill pipe which has its discharge opening entirely submerged when the liquid level is six inches above the botton of the tank. "Submerged fill pipe" when applied to a tank which is loaded from the side, means any fill pipe which has its discharge opening entirely submerged when the liquid level is 18 inches above the bottom of the tank.
      
      
3. The requirements of Rule 482(b) shall not apply:
   
   
   1. To any stationary tanks installed prior to December 31, 1970.
      
      
   2. To any stationary tank which is used primarily for the fueling of implements used in agricultural operations.
      
      
   3. To any "pressure tank" which maintains working pressure sufficient at all times to prevent hydrocarbon vapor or gas loss to the atmosphere.
      
      
   4. To any tank equipped with a "vapor recovery system" consisting of a vapor gathering system capable of collecting the hydrocarbon vapors and gases discharged and a vapor disposal system capable of processing such vapors and gases so as to prevent their emission into the atmosphere, with all tank gauging and sampling devices gastight except when gauging or sampling is taking place.
      
      
   5. To any tank equipped with a "floating roof" which consists of a pontoon-type or double-deck-type roof, resting on the surface of the liquid contents and equipped with a closure seal, or seals, to close the space between the roof edge and tank wall. A floating roof tank shall not be used if the gasoline or petroleum distillate has a vapor pressure of 570 millimeters of mercury absolute (11.0 pounds per square inch absolute) or greater, under actual storage conditions. All tank gauging and sampling devices shall be gastight except when gauging or sampling is taking place.