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i <br /> LABORATORY NARRATIVE <br /> Modified TO-3 <br /> Ground Zero Analysis,Inc <br /> ' Workorder#0206191 <br /> Two 1 Liter Tedlar Bag samples were received on June 11, 2002 The laboratory performed analysis via <br /> modified EPA Method TO-3 for Methyl tert-Butyl Ether (MTBE), Benzene, Toluene, Ethylbenzene, Xylenes <br /> and Total Petroleum Hydrocarbons (TPH) BTEX and MTBE were analyzed via GC/PM and TPH via <br /> ' GC/FID The TPH results are calculated using the response of Gasoline A molecular weight of 100 is used to <br /> convert the TPH ppmv result to ug/L The method involves concentrating up to 200 mL of sample The <br /> concentrated aliquot is then dry purged to remove water vapor prior to entering the chromatographic system. <br /> ' See the data sheets for the reporting limits for each compound <br /> Receiving Notes <br /> ' There were no receiving discrepancies <br /> Analytical Notes <br /> ' There were no analytical discrepancies <br /> Definition of Data Quahfymg Flags <br /> Seven qualifiers may have been used on the data analysis sheets and indicate as follows <br /> lieB- Compound present in laboratory blank greater than reporting hmit <br /> J- Estimated value <br /> E- Exceeds instrument calibration range <br /> ' S - Saturated peak <br /> Q- Exceeds quahty control lutists <br /> U- Compound analyzed for but not detected above the detection hmit <br /> ' M- Reported value may be biased due to apparent matrix interferences <br /> File extensions may have been used on the data analysis sheets and indicates <br /> ' as follows <br /> a-File was requantified <br /> b-File was quantified by a second column and detector <br /> ' rl-File was requantified for the purpose of reissue <br /> 1 <br /> 1 <br /> Page 2 of 6 <br /> 1 <br />