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• LABORATORY NARRATIVE <br /> TO-3 <br /> Ground Zero Analysis, Inc. <br /> Workorder#0112309 <br /> Two i Liter Tedlar Bag samples were received on December 18, 2001. The laboratory performed analysis <br /> via modified EPA Method TO-3 for Benzene, Toluene, Ethylbenzene, Xylenes and Total Petroleum <br /> Hydrocarbons (TPH). BTEX was analyzed via GC/PID and TPH via GC/FID. The TPH results are <br /> calculated using the response of Gasoline. A molecular weight of 100 is used to convert the TPH ppmv <br /> result to ug/L. The method involves concentrating up to 200 mL of sample. The concentrated aliquot is <br /> then dry purged to remove water vapor prior to entering the chromatographic system. See the data sheets <br /> for the reporting limits for each compound. <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analvtical Notes <br /> There were no analytical discrepancies. <br /> Definition of DaLa_Qualifying Flags <br /> Seven qualifiers may have been used on the data analysis sheets and indicate as follows: <br /> Compound present in laboratory blank greater than reporting limit. <br /> - Estimated value. <br /> E - Exceeds instrument calibration range. <br /> S - Saturated peak. <br /> Q - Exceeds quality control limits. <br /> U- Compound analyzed for but not detected above the detection limit. <br /> M - Reported value maybe biased due to apparent matrix interferences. <br /> i <br /> Page 2 of 7 <br />