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Piping <br />Piping probes are placed along the product distribution, vapor recovery and vent piping <br />trenches, generally at a depth of two feet below grade, every twenty feet in horizontal <br />distance. In situations where piping trenches do not contain engineered backfill (i.e. pea - <br />gravel), the sampling probes are installed within five horizontal feet of all possible leak <br />locations. <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. Facilities containing less than four <br />tanks within the same tank pit will be inoculated with different chemical tracers, therefore <br />each will provide its own chromatographic signature. Water soluble and other unique <br />non -petroleum based products may requirement the duplication of the same tracer with <br />respect to other adjacent tanks. <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 />Please note the details provided in this Work Plan regarding the test specifications, including but not limited to probe placement are <br />considered proprietary confidential information and are considered the property of Tracer Research Corporation and are patent <br />protected and shall only be used for technology evaluation purposes.. <br />