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_ � 1 volume of the entire tank compartment to be less than 5 pounds per square inch (34.48 kPa) gauge at delivered or the volume of the entire tank the highest point of the system. This test shall be compartment to be delivered plus 200 gallons, maintained for a sufficient time to complete visual whichever is less, as determined by underground inspection of all points and connections, but for at storage tank guaging; or least 10 minutes. In lieu of the above, a test using accepted engineering practices shall be used. Some (C) The hazardous substance being delivered can be acceptable test methods for testing pipelines are metered into the underground storage tank and the provided in Appendix I of this subchapter. Double- available underground storage tank capacity is walled underground storage tanks are exempt from the determined immediately prior to filling. requirements of this section provided that the annular space is monitored using either pressure or vacuum (p) Secondary containers including leak interception and testing. detection systems installed pursuant to Section 2633 of this (8) When required by the local agency, all underground article shall comply with all of the following: storage tanks shall be equipped with an overflow (1) The secondary container shall, at a minimum, encompass protection system which includes the following the area within the system of vertical planes elements: surrounding the exterior of the primary containment (A) A spill catchment basin which surrounds the fill unit. If backfill is placed between the primary andsecondary containment, then an evaluation shall be made pipe and prevents the inflow of the hazardous of the maximum lateral spread of a point leak from the substance into the subsurface environment. A primary containment over the vertical distance between level sensing device that continuously monitors the primary and secondary containment. The secondary and indicates the liquid level in the underground containment shall extend an additional distance beyond storage tank and either (B) or (C) of this the vertical planes described above equal to the radius subsection or both; of lateral spread plus 1 foot. (8) An audible/visual alarm system triggered by a (2) The secondary container must be capable of precluding liquid level sensor to alert the operator-of an the inflow of the highest ground water anticipated impending overfill condition; or during the life of the underground storage tank into (C) An automatic shut-off device that stops the flow the space between the primary and secondary containers of product being delivered to the underground (3) If the space between the primary and secondary storage tank when the underground storage tank is full. containers is backfilled, the backfill material shall not preclude the vertical movement of leakage from any �j "(9) The overflow r2tection system required in Subsection part of the primary container. b of this section shall be waived for underground storage tanks containing motor vehicle fuels in which a (4) The secondary container and any backfill material catchment between the primary and secondary containers shall be spill tchment basin surrounds the fill pipe and pdesigned and constructed to promote gravity drainage of prevents the inflow of the motor vehicle fuel into the a leak of hazardous 7(A urface environment and: arous sustances from any Dart of the primary container to the monitoring locatlons(s). ,'Both the fluid level is visually monitored and the filling operation is controlled by the facility (5) Two or more primary containers shall not utilize the operator during filling of the underground storage same secondary containerinerif if the primary containers operatorduring materials that in combination may cause a fire or tank; explosion; or the production of a flammable, toxic, or (B) The available capacity of the underground storage poisonous gas; or the deterioration of a primary or tank to be filled is determined immediately prior secondary container. to filling to be at least 103 percent of the 3. 17 3.18