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'SAN-26-2005 03:40P FROM:PRRXWSERVICES 520 B88 3923 9120946834330011 P:4 <br /> 0 <br /> Revietacd by David Rabb PiServiceInc. <br /> Approved by Rraxar service,Randy Golding Trncenc. l <br /> Update 10-14-04 <br /> Leak Simulation Version V-4 <br /> Injecting a tracer into the backfill performs a leak simulation. The leak simulation tracer is not one of the tracers used in <br /> testing the system. The migration period of the leak simulation tracer is monitored through the sampling probes. The <br /> minimum migration time required for the test is equal to the time required for the leak simulation tracer to move an <br /> acceptable distance. The minimal acceptable distance is the longest distance that the test tracer would have to travel from <br /> any leak location to the location of a sampling probe. <br /> Sample Collection <br /> Once the leak simulation migration period is determined satisfactory the inoculation and waiting period is completed and <br /> sampling can begin. Vapor samples are collected from all sampling probes. Additional vapor samples may be collected <br /> from sumps containing UST components,UDC's and from the interstitial spaces of double walled components. <br /> Sample Analysis <br /> Samples are analyzed using an on site laboratory grade gas chromatograph (GC). The GC is calibrated using an external <br /> gas standard. Samples are analyzed by direct injection into the GC. The results are evaluated by comparison to the <br /> analytical standard. Whenever tracer is detected in the subsurface samples,blanks are run to validate the tracer detection. <br /> Spill-Bucket Testing <br /> Over-spill-buckets are tested hydro-statically. A decrease in water level indicates a leak. If leaks occur, spill bucket seals <br /> should be repaired or replaced. <br /> Reporting <br /> The findings of the Tracer Tight® ELDTm test and site evaluation will be summarized in a written report and sent to the <br /> client within two weeks of the completion of the fieldwork. All data acquired from probe and sump samples will be <br /> reported along with spill bucket hydro-test results. <br /> For questions or assistance contact: <br /> Contractor <br /> David Rabb <br /> Praxair Services,Inc <br /> 3755 North Business Center Drive <br /> Tucson,Arizona 85705 <br /> Tucson Office 520.545.0250 <br /> Cell 520.906.5474 <br /> Tucson Fax 520.293.1306 <br /> David_Rabb®Praxair-oom <br /> THIS WFORMATIONIS THEPROPERTY OFPRAXAZR SERPICE,INC <br /> 3 of <br />