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LABORATORY NARRATIVE <br /> TO-3 <br /> Ground Zero Analysis, Inc. <br /> . Workorder# 0112177 <br /> Three 1 Liter Tedlar Bag samples were received on December 12, 2001. The laboratory performed <br /> analysis via modified EPA Method TO-3 for Benzene, Toluene, Ethylbenzene, Xylenes and Total <br /> Petroleum Hydrocarbons (TPH). BTEX was analyzed via GC/PID and TPH via GC/FID. The TPH <br /> results are calculated using the response of Gasoline. A molecular weight of 100 is used to convert the <br /> TPH ppmv result to ug/L. The method involves concentrating up to 200 mL of sample. The concentrated <br /> aliquot is then dry purged to remove water vapor prior to entering the chromatographic system. See the <br /> data sheets for the reporting limits for each compound. <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analvtical Notes <br /> The recovery of surrogate Fluorobenzene in sample VEW-2 Duplicate was outside control limits on the <br /> FID due to high level hydrocarbon matrix interference. Data is reported as qualified. <br /> Definition of Data Oualifvin2 Flats <br /> Seven qualifiers may have been used on the data analysis sheets and indicate as follows: <br /> .B - Compound present in laboratory blank greater than reporting limit. <br /> J - 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 may be biased due to apparent matrix interferences. <br /> • <br /> Page 2 of 8 <br />