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f <br /> 1 LABORATORY NARRATIVE <br /> TO-3 <br /> I <br /> Ground Zero Analysis, Inc. <br /> • Workorder# 0204361 <br /> One 1 Liter Tedlar Bag sample was received on April 18, 2002 The laboratory performed analysis via <br /> ' modified EPA Method TO-3 for Benzene, Toluene, Ethylbenzene, Xylenes, Methyl tert-butyl Ether and <br /> Total Petroleum Hydrocarbons (TPH) BTEXIMTBE was analyzed via GC/PID and TPH via GC/FID <br /> The TPH results are calculated using the response of Gasoline A molecular weight of 100 is used to <br /> 1 1 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 <br /> I <br /> system See the data sheets for the reporting limits for each compound <br /> Receivine Notes <br /> ' There were no receiving discrepancies <br /> Analytical Notes <br /> There were no analytical discrepancies y <br /> I <br /> ' Definition of Data Oualifyin2 Flaes <br /> Seven qualifiers may have been used on the data analysts sheets and indicate as follows <br /> ' 4Compound present in laboratory blank greater than reporting limit <br /> j - Estimated value <br /> E - Exceeds instrument calibration range <br /> ' <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 may be biased due to apparent matrix interferences <br /> ' t <br /> 1 <br /> 0 <br /> Page 2 of 5 <br />