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r , <br /> LABORATORY NARRATIVE <br /> Modified TO-3 <br /> Geological Technics <br /> Workorder#0301023 <br /> Two l Liter Tedlar Bag samples were received. on Janu�uy 03, 2003. The laboratory performed analysis via <br /> modified EPA Method TO-3 for Methyl tert-Butyl Ether(MTBE), Benzene,Toluene,Ethylbenzene, Xylenes <br /> r. and Total Petroleum Hydrocarbons(TPH). MTBE/BTEX was analyzed via GC/PID and TPH via GC/FID. <br /> LThe TPH results are calculated using the response of Gasoline. A molecular weight of 100 is used to convert <br /> the TPH ppinv result to ug/L. The method involves concentrating up to 200 rnL 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 ATL A1odfflcutions <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 lhrs 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 /> 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 /> rthe standard deviation <br /> L; 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 dilutioll of gas gas mixture <br /> mixture <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> ancies. <br /> P <br /> Analytical Notes <br /> There were no analytical discrepancies. <br /> Definition of Data Qualifying Flags <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 /> J{+✓ 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 /> Page 2 of 8 <br />