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<br />Exclusive Providers for MDleak® and PHDleak™ Technologies <br />2765 East Wieding Rd  Tucson, AZ 85718  Phone 520.207.4878  FAX: 520.990.8965  www.LeakDetect.net <br /> <br />Author David Rabb 2 of 8 <br />Version 211202 <br />ELD Pre-Backfill Instructions for Owners and Contractors <br /> <br />Concept: <br />A Proprietary Chemical Marker is added to the containment/s to be tested, such as an underground storage <br />tank (UST), or pipeline. Once the Chemical Marker gas is added to the tank, product, and vapor piping <br />primary containment any leak in the containment would carry the Chemical Marker out into the <br />surrounding secondary containment and/or soil. By utilizing test ports vapor samples can be taken from <br />the secondary containments and/or soil and analyzed using sensitive, sophisticated analytical equipment. <br />If the Chemical Marker is detected outside of the containment, a leak may exist. <br /> <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 /> <br /> <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 /> <br />Setup: <br />1. Extraction plugs should be installed and sealed properly. <br />2. During the setup portion of the test a tank system 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 />d. Vent riser primary pipe is required to have test ports to verify communication. <br />3. Tanks with a vapor interstice are ready to proceed. <br />4. Tanks with a liquid interstice, will be tested utilizing our MCleak® approved test method. <br />a. The MCleak® test method requires setup prior to LDT arrival onsite. Be sure and have the <br />current MCleak® wet tank interstice workplan and checklist reviewed 72 hours before <br />LDT’s arrival to eliminate delays. <br />5. The contractor shall have all shear valves plugged or capped and connected to the piping. <br />6. It is best to complete the turbine connections before the Pretest. Locating and repairing fittings <br />within the tank sumps during the pretesting is more efficient and less confining than during the <br />final ELD testing.