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Dec 16 04 04:51p cG#b cn 91691-1177 p.5 <br />` N <br />Inoculation <br />Inoculation is the process of adding chemical tracer to product in the system to be tested. <br />Product is inoculated with a predetermined amount of tracer, thoroughly mixed in the <br />tank and transferred throughout the piping system. <br />Systems that will receive more than one tank volume in deliveries during the first three <br />days following the inoculation receive enough of the tracer to inoculate all of the fuel that <br />will be received during that period. <br />Sample Collection <br />After the appropriate waiting period of seven to fourteen days after system inoculation, <br />vapor samples are collected from all sampling probes. Additional vapor samples may be <br />collected from sumps containing UST components and from the interstitial spaces of <br />double walled components. Air blanks are also collected to confirm any possible <br />detections of tracers. <br />Sample Analysis <br />Samples are analyzed using a laboratory grade gas chromatograph {GC). The GC is <br />calibrated using an external gas standard. Samples are analyzed by direct injection into <br />the GC. The results are evaluated by comparison to the analytical standard. Whenever <br />tracer is detected in the subsurface samples, blanks are run to validate the tracer <br />detection. <br />Reporting <br />The findings of the Tracer Tight test and site evaluation will be summarized in a written <br />report and sent to the client within two to four weeks of the completion of the field work. <br />