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