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has displaced the entire volume of the vent piping. The concentration of the tracer in the receiving container is then measured. Leak Simulation Injecting a tracer into the backfill performs a leak simulation. The leak simulation tracer is not one of the tracers used in testing the system. The migration period of the leak simulation tracer is monitored through the sampling probes. The minimum migration time required for the test is equal to the time required for the leak simulation tracer to move an acceptable distance. The minimal acceptable distance is the longest distance that the test tracer would have to travel from any leak location to the location of a sampling probe. Sample Collection Once the leak simulation migration period is determined, the inoculation and waiting period is completed and sampling can begin.Vapor samples are collected from all sampling probes. Additional vapor samples may be collected from sumps containing UST components, under dispenser containers (UDCs) and from the interstitial spaces of double walled components. Sample Analysis Samples are analyzed using an on site laboratory grade gas chromatograph (GC). The GC is calibrated using an external gas standard. Samples are analyzed by direct injection into the GC. The results are evaluated by comparison to the analytical standard. Whenever tracer is detected in the subsurface samples,blanks are run to validate the tracer detection. Spill-Bucket Testing Over-spill-buckets are tested hydro-statically. A decrease in water level indicates a leak. If leaks occur, spill bucket seals should be repaired or replaced. Reporting The findings of the Tracer Tighte ELD test and site evaluation will be summarized in a written report and sent to the client within two weeks of the completion of the fieldwork. All data acquired from probe and sump samples will be reported along with spill bucket hydro-test results. ' THIS INFORMATION IS THE PROPERTY OF PRAWR SERVICES,INC.. 3 of 3