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FROM (TUE) JUN 2 2009 18 '19/ST. 18: 16/No. 6801210790 P 5 LEAK DE'TECTTUN 1-I00 k:ast Paseo Pavon Tucson, AG 85718 Phone 520.21)7..1878 1 \\: 52(090.8965 www.l.cak De.t:ect.net can be taken from the sampling ports and analyzed using sensitive, sophisticated analytical equipment. If the chemical marker is detected outside of the containment, a leak may exist. Preparation: 1. Before testing can begin all permits and site information must be acquired by the contractor or owner. LDT will supply all documents required as requested. 2. The owner or contractor should mark all piping runs. Sampling probes will be installed in the pipeline trenches. When pipelines are not located some additional probing may be required. Setup: 1. During the setup portion of the test a contractor is required to be present onsite. a. The contractor is required to be prepared to repair any accessible component at the facility. b. Access ports to the secondary containment are required to be installed by the contractor prior to LDT arriving at the site. c. Access to the top of the vent risers, tank sumps and UDC's may be required. 2. Sampling ports are installed along the piping trenches and around the tanks. Depettding on the test method the distances between sampling ports can vary but are never greater than 30 feet. Procedure: 1. A Chemical Marker is added to the product and/or to the airspace within the tank. 2. Prior to starting the test a Site Evaluation Screening of the accessible system components is completed, LDT will scan exposed_components and identifying any leaks for the contractor who will make repairs. After the completion of the repairs found during:-the Site Evaluation Screening the contractor may leave the site, 3. Once all the accessible components with leaks are repaired, LDT can begin testing the underground portion of the system. 4. A different chemical marker is introduced into the tank. This chemical marker is then pumped throughout the systems product,vent, and vapor return piping as applicable. S. Double Wall Containment Testing: a. Primary Wall test to Secondary Containment: i. If a leak is present in the primary wall the chemical marker will exit into the secondary containment, The secondary containment will be sampled for the chemical marker. ii. If the chemical marker is found a leak is declared and the leak location will be identified. b. Secondary Wall Test to Soil: i. Even though this is an optional test most owners request the secondary wall to also be tested. This is an inexpensive test given that all of the test components are already in dace. ii. The test is simple and includes replacing the atmosphere within the secondary with a third chemical marker. %urh it DAVid RA)b 2of 3