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Revision Date: November 6, 2001 <br />Tracer Research Corp. <br />Tracer Tight <br />NON -VOLUMETRIC TANK TIGHTNESS TEST METHOD (TRACER) <br />Certification: Leak rate of 0.1 gph with PD =100% and PFA = 0%. <br />Leak rate of 0.005 gph with PD = 97% and PFA = 2.9%. <br />Leak Threshold: A tank system should not be declared tight when tracer chemical is detected outside of <br />the tank system. <br />Applicability: Gasoline, diesel, aviation fuel, fuel oil #4, waste oil. <br />Other fluids which are compatible and soluble with an acceptable tracer chemical may <br />be tested after consultation with the manufacturer. <br />Tank Capacity: Not limited by capacity. <br />Waiting Time: Ranges from 7 to 30 days (normally 2 weeks) after tracer is added to tank. <br />Tracer Dosage: Dosage of tracer is based on tank size, product volume in tank, and frequency and <br />volume of tank refills according to manufacturer's recommendations. <br />Permeability: Soil permeability must readily allow tracer movement through the tank excavation <br />backfill <br />(greater than 1 Darcy). <br />Probe: Radius of influence of each tracer sampling probe is maximum 10 feet. <br />All tank surfaces must be within the zone of influence of a sampling probe. <br />Probes must be installed per Manufactutees guidelines. <br />Groundwater: Depth to groundwater in tank excavation backfill must be determined. For test method to <br />detect a release of tracer chemical below groundwater, the hydrostatic pressure of product <br />in the tank must exceed the hydrostatic pressure of groundwater during test. To <br />accomplish this, product level must be maintained at least 6 inches above groundwater <br />for a minimum 17 hours during the first three days following addition of tracer to the <br />tank. <br />At the discretion of the regulatory agency, water ingress measuring devices may be used <br />to supplement test method in high groundwater conditions. <br />Comments: Frozen and saturated soil above bottom of tank may limit effectiveness of this test <br />method. <br />Groundwater above bottom of tank may limit effectiveness of test method (e.g. when <br />applied to tanks containing water -miscible products or products whose specific gravity is <br />greater than 1). <br />Tracer Research Corp. <br />3755 N. Business Center Dr. <br />Tucson, AZ 85705 <br />Tel: (800) 394-9929 <br />Evaluator: Ken Wilcox Associates <br />Tel: (816) 443-2494 <br />Date of Evaluation: 10/04/90 <br />Evaluator: Control Strategies Engineering <br />Tel: (602) 682-8726 <br />Date of Evaluation: 05/92 <br />