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UtATIONS <br />and Storage <br />mstructed, <br />wing <br />pry before <br />tanks were <br />the industry <br />a,_.. <br />STATC CF <br />- GTTau nr:=u'•. <br />CCR, TITLE. 23, DMSION 3, CHAPTER 16, UNDERGROUND STORAGE TANK REGULATIONS <br />equivalent differential pressure test, expressed in inches of mercury <br />vacuum, in the interstitial space of the secondan- containment, is <br />acceptable. The pressure (or vacuum in the interstitial space) shall be <br />maintained for a minimum of 30 minutes to determine if the tank is <br />tight. If a tank fails the tightness test, as evidenced by soap bubbles, <br />or water droplets, installation shall be suspended until the tank is <br />replaced or repaired by a factory authorized repair service. Following <br />repair or replacement, the tank shall pass a tightness test. <br />(4) All secondary containment systems shall pass a post -installation test <br />which meets the approval of the local agency. <br />(5) After installation, but before the underground storage tank is placed in <br />service, a tank integrity test shall be conducted to ensure that no <br />damage occurred during installation. The tank integrity test is not <br />required if the tank is equipped with an interstitial monitor certified <br />by a third -party evaluator to meet the performance standards of a <br />"tank integrity test" as defined in section 2611, or if the tank is tested <br />using another method deemed by the State Water Resources Control <br />Board to be equivalent. <br />(6) All underground storage tanks shall be installed according to a code of <br />practice developed in accordance with voluntary consensus standards <br />and the manufacturer's written installation instructions. The on ner or <br />operator shall certify that the underground storage tank was installed <br />in accordance with the above requirements as required by subsection <br />(d) of this section. <br />(7) All underground storage tanks subject to flotation shall be anchored <br />using methods specified by the manufacturer o.-, if none exist, shall be <br />anchored according to the best engineering judgment. <br />(b) All underground storage tanks shall be equipped with a spill container and an <br />overfill prevention system as follows: <br />(1) The spill container shall collect any hazardous substances spilled <br />during product delivery operations to prevent the hazardous substance <br />from entering the subsurface environment. The spill container shall <br />meet the following requirements: <br />(A) If it is made of metal, the exterior wall shall be protected from <br />galvanic corrosion. <br />�. (B) It shall have a minimum capacity of five gallons (19 liters). <br />(C) It shall have a drain valve which allows drainage of the collected <br />spill into the primary container or provide a means to keep the <br />spill container empty: -- <br />3-13 <br />n <br />