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LEAK DETECTION <br /> TECHN0L0GIESi_ t . C' <br /> Exclusive Providers for MDleak® and PHDleakT"' Technologies <br /> 2765 East NViedinn Rd Tucson, AZ 85718 Phone 520 . 207 . 4878 FAX: 520 . 990 . 8965 vv \x7w . 1.eakDetect. net <br /> Procedure . <br /> 1 . A Proprietary Chemical Marker/Tracer is added to the liquid within the tank interstice during the <br /> ELD pre-backfill pretest. <br /> 2 . Systems check : <br /> a. Prior to starting the test an evaluation of the accessible system components is completed. <br /> LDT will scan exposed components and identifying any leaks for the contractor who will <br /> make repairs . After the completion of the repairs the contractor may leave the site . <br /> b . Once all the accessible components with leaks are repair, LDT can begin testing the <br /> underground portion of the system. <br /> 3 . Testing : <br /> a. A different Chemical Marker/Tracer is introduced into the primary tank and piping . <br /> b . This second Chemical Marker/Tracer is then pumped throughout the systems primary <br /> product, vent, and vapor return piping as applicable . <br /> c . Each component is pressurized to the working pressure of the individual component with <br /> the chemical marker. <br /> d. Once the primary component is pressurized with the Chemical Marker/Tracer gas the <br /> secondary containment surrounding the primary containment can be sampled. This <br /> sampling even includes tank sumps for primary tank leaks . <br /> e . If the Chemical Marker/Tracer is found in the secondary containment sample a leak is <br /> declared and the leak location will be identified . <br /> 4 . Spill Bucket Testing : <br /> a. Spill Buckets are pneumatically tested. A leak rate is calculated and could indicate a leak <br /> within the spill bucket . <br /> b . If a leak is detected the contractor will be directed to the leak and a repair of the spill bucket <br /> will be completed. <br /> 5 . Final cleanup : <br /> a. All inoculated primary containments shall be purged of chemical marker before leaving the <br /> site <br /> Reporting : <br /> 1 . Reports consist of a two -page written document summarizing the data collected at each site . <br /> 2 . Each component in the system is listed and certified individual . <br /> 3 . Owners, contractors , inspectors and regulators are invited to contact LDT for specifications <br /> regarding MDleak® test methods . <br /> Author David Rabb 3of 8 <br /> Version 210505 <br />