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LLC <br /> Exclusive Providers for MDleak® and PHDleakT" Technologies <br /> 1400 East Paseo Pavon Tucson, AZ 85718 Phone 520 . 207 . 4878 FAQ': 520 . 990 . 8965 www.LeakDctect. net <br /> ELD Pre -Backfill Instructions for Owners and Contractors <br /> Concept : <br /> A Proprietary Chemical Marker or Tracer is added to the containment/s to be tested, such as an <br /> underground storage tank (UST) , or pipeline . Once the Chemical Marker/Tracer gas is added to the tank, <br /> product, and vapor piping primary containment any leak in the containment would carry the Chemical <br /> Marker/Tracer out into the surrounding secondary containment and/or soil . By utilizing test ports vapor <br /> samples can be taken from the secondary containments and/or soil and analyzed using sensitive, <br /> sophisticated analytical equipment . If the Chemical Marker/Tracer is detected outside of the containment, <br /> a leak may exist. <br /> Pre-Backfill Testing (Pretest) : <br /> ELD testing has a greater sensitivity than the federal standard which utilizes conventional testing <br /> methods . For example, a 60 psi pneumatic pressure test of a 150 foot 1 . 5 " pipeline with a leak rate <br /> of 1psi per-hour equates to an 8760 gallon per year leak rate . Most 2 " diameter pressure gauges <br /> would not detect this leak rate in one hour . <br /> Preparation . <br /> 1 . Before testing can begin all permits and site information must be acquired by the contractor or <br /> owner . LDT will supply all documents required as requested . <br /> 2 . The contractor must notify LDT if any component in the system was installed that is not full <br /> vacuum compatible . <br /> Setup . <br /> 1 . During the setup portion of the test a contractor is required to be present onsite . <br /> a . The contractor is required to be prepared to repair any accessible component at the facility . <br /> b . Access ports to the secondary containment are required to be installed by the contractor <br /> prior to LDT arriving at the site . <br /> c . Access to the top of the vent risers , tank sumps and UDC ' s may be required . <br /> 2 . Tanks with a vapor interstice are install ready to proceed <br /> 3 . Tanks with a liquid interstice will be inoculated with a water soluble liquid chemical marker . <br /> Author David Rabb 2of 7 <br /> Version 191127 <br />