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Tracer peaverch Corporation <br /> JULi <br /> Injector part septa through which soil gas samples are injected into the <br /> chromatograph are replaced on a daily basis to prevent possible gas leaks from the <br /> chromatographic column. <br /> Analytical instruments are calibrated each day by analytical standards from <br /> Chem Service, Inc.. Calibration checks are also run after approximately every five <br /> soil gas sampling locations. <br /> ° Subsamgling syringes are checked for contamination prior to sampling each <br /> ~4 day by injecting nitrogen carrier gas into the gas chromatograph. <br /> Prior to sampling each day, system blanks are run to check the sampling <br /> _ apparatus (probe,adaptor, 1p cc syringe)for contamination by drawing ambient air <br /> from above ground through the system and comparing the analysis to concurrently <br /> sampled ambient air analysis. <br /> All sampling and subsam lin syringes are decontaminated each day and no <br /> r% p g p g <br /> such equipment is reused before being decontaminated. Microliter size subsampling <br /> rw syringes are reused only after a nitrogen carrier gas blank is run to insure it isnot <br /> contaminated by the previous sample. <br /> Soil gas pumping is monitored by a vacuum gauge to insure that an adequate <br /> vadose zone is ainta'_ned. A reliable gas s <br /> gas flaw from the <br /> can be obtained <br /> m <br /> -� if the sample vacuum gauge reading is at least 2 inches Hg less than the maximum <br /> pump vacuum. <br /> 6 <br />