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LABORATORY NARRATIVE <br /> Modified TO-3 <br /> Geological Technics <br /> C Workorder#0301503 <br /> Two 1 Liter Tedlar Bag samples were received on January 28, 2003. 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). BTEX/MTBE was analyzed via GC/PID and TPH via GC/FID. The <br /> iTPH 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 rrL of sample. The concentrated <br /> aliquot is then dry purged to remove water vapor prior to entering the chromatographic system. See the data <br />' sheets for the reporting limits for each compound. <br /> Requirement TO-3 ATL Modifications <br /> Daily Calibration Standard Prior to sample analysis Prior to sample analysis(BTEX and TPH stds.)and after the <br /> Frequency and every 4-6 hrs analytical batch</=20 samples(BTEX std.) <br /> Initial Calibration Calculation 4-point calibration 5-point calibration using average Response Factor <br /> using a linear <br /> regression model <br /> Initial Calibration Frequency Weekly When daily calibration standard recovery is outside 75-125 <br /> %,or upon significant changes to procedure or <br /> rinstrumentation <br /> L Moisture Control Nafion system Sorbent system <br /> Minimum Detection Limit(MDL) Calculated using the 40 CFR Pt. 136 App. B <br /> equation DL=A+3.3 S, <br /> where A is intercept of <br /> calibration line and S is <br /> ' the standard deviation <br /> of at least 3 reps of <br /> low level standard <br /> Preparation of Standards Levels achieved Levels achieved through loading various volumes of the gay <br /> through dilution of gas mixture <br /> mixture <br /> Receiving Notes . <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> There were no analytical discrepancies. <br /> Definition of Dataualif `n s <br /> O vi g Flags <br /> 1, 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 /> w M- Reported value may be biased due to apparent matrix interferences. <br /> Page 2 of 7, <br />