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LABORATORY NARRATIVE <br /> . Modified TO-3 <br /> Del-Tech <br /> Workorder#0310457 <br /> Four 1 Liter Tedlar Bag samples were received on October 23, 2003 The laboratory performed analysis via <br /> modified EPA Method TO-3 for Methyl tert-Butyl Ether (MTBE), Benzene, Toluene, Ethylbenzene, <br /> Xylenes and Total Petroleum Hydrocarbons (TPH) MTBE/BTEX was analyzed via GC/PID and TPH via <br /> GC/FID The TPH results are calculated using the response of Gasoline A molecular weight of 100 is used <br /> to 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 system. <br /> See the data sheets for the reporting limits for each compound <br /> Requirement TO-3 ATL Modifications <br /> Daily Calibration Standard Pnor to sample analysis Prior to sample analysis and after the analytical batch</=20 <br /> Frequency and every 4- 6 hrs samples <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 /> 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 gas <br /> through dilution of gas mixture <br /> mixture <br /> Receivin Notes <br /> All sample identifications on the chain of custody were not unique The time of collection was added to the <br /> identification to assure uniqueness <br /> Analytical Notes <br /> There were no analytical discrepancies <br /> Definition of Data Qualifying FIags <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 /> Page 2 of 10 <br />