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LABORATORY NARRATIVE <br /> Modified TO-3 <br /> Geological Technics <br /> Workorder#0301024 <br /> i • <br /> Two 1 Liter Tedlar Bag samples were received on January 03, 2003. 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). MTBE/BTEX 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 convert <br /> 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 /> Requirement TO-3 A 7 Mod ications <br /> {- Daily Calibration Standard Prior to sample analysis Prior to sample analysis(BTEX and TPH stds.)and after the <br /> i <br /> L 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 /> I <br /> Initial Calibration Frequency Weekly When daily calibration standard recovery is outside 75- 125 <br /> 1A,or upon significant changes to procedure or. <br /> instrumentation <br /> Moisture Control Nafion system Sorbent system <br /> Minimum Detection Limit(MDL) Calculated using the 40 CFR Pt. 136 App. B <br /> equation DL=A+3.3S, <br /> where A is intercept of <br /> calibration line and S.is <br /> the standard deviation <br /> of at least 3 reps of low <br /> level standard <br /> Preparation of Standards .Levels achieved Levels achieved through loading various volumes of the <br /> through dilution of gas gas mixture <br /> mixture <br /> iReceiving Notes <br /> There were no receiving discrepancies. <br /> Analvtical Notes <br /> There were no analytical discrepancies. <br /> 4 <br /> Definition of Data Qualifying Flags <br /> rSeven 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 - Estnnated 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 die detection limit. <br /> M- Reported value may be biased due to apparent matrix interferences. <br /> Page 2 of.8 <br />