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By minimizing what flows into the MS, this instrument is able to utilize a <br /> chemical NEG pump rather than a mechanical pump. The NEG pump <br /> maintains adequate vacuum for several weeks. As a result, this compact <br /> pump allows the GC/MS to be used in a portable mode without the use of a <br /> heavy mechanical pump. The run time on the Hapsite GUMS is typically 10 <br /> minutes or less. A very aggressive list of compounds can be achieved in this <br /> time. Since the column is isothermal, there is no cool down time necessary <br /> and the next analysis can be started immediately for maximum throughput. <br /> In addition to target compounds, the Hapsite GUMS produces standard <br /> NIST searchable spectra to identify unknown compounds. The Hapsite <br /> GC/MS co-injects 2 compounds as internal standards with every analysis. <br /> These compounds are used for quantitative reasons and as additional <br /> QA/QC for each analysis. <br /> Quality Assurance/Quality Control <br /> Five-Point Calibration <br /> The GC/MS will be calibrated for the compounds of interest. A five-point <br /> calibration will be performed. The five concentration levels will span the <br /> linear range of the instrument. The calibration will have a relative standard <br /> deviation (RSD) of less than or equal to 25%. <br /> Mass Spectral Ion Intensity Verification <br /> The mass spectral ion intensities will be verified at the beginning each day of <br /> analyses. They will be verified using 4-Bromofluorobenzene (BFB). <br /> Standard SW-846 acceptance criteria will be used. Tune verification will be <br /> considered valid for 12 hours. <br /> Continuing Calibration Checks <br /> There will be a mid-level calibration check standard analyzed on the GUMS <br /> at the beginning of each day of analyses. The acceptance criteria for the <br /> calibration check standards will be ± 30% of the expected concentrations for <br /> the target compounds. <br /> System and Reagent Blanks <br /> A blank sample will be analyzed prior to analysis of any samples. Also blank <br /> samples will be analyzed in accordance with requirements set forth in the <br /> RFP to ensure no carryover. The acceptance criteria for the blank samples <br /> will be that there are no compounds above the detection limit. <br /> SP Environmental Services©November, 2000 Page 6 of 7 Sukut Construction,Inc. <br /> Air Monitoring Plan-DRAFT Tracy Tire Fire Suppression Project <br />