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_ I <br /> LABORATORY NARRATIVE <br /> Modified TO-3 ' <br /> ENSR <br /> Workorder#0409473 <br /> Two 1 Liter Tedlar Bag samples were received on September 24, 2004 The laboratory performed analysis <br /> for volatile organic compounds in air via modified EPA Method TO-3 using gas chromatography with photo <br /> ionization and flame ionization detection 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 t <br /> The TPH (Gasoline Range)results are calculated using the response factor of Gasoline and correspond to the <br /> range of hydrocarbons from C5 to CIO A molecular weight of 100 is used to convert the TPH (Gasoline ' <br /> Range)ppmv result to ug/L, See the data sheets for the reporting limits for each compound <br /> Method modifications taken to run these samples include <br /> Requirement TO-3 ATL Modifications <br /> Daily Calibration Standard Prior to sample analysis Prior to sample analysis and after the analytical batch</= <br /> Frequency and every 4-6 hrs 20 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 - <br /> 125%,or upon significant changes to procedure or <br /> instrumentation <br /> Moisture Control Nafion system Sorbent system <br /> Minimum Detection Limit(MDL) Calculated using the 44 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 - -- T -- - --- --T -- - -- - - <br /> low level standard <br /> Preparation of Standards Levels achieved Levels achieved through loading various volumes of the <br /> - - - _ i - through dilution of gas gas mixture v l y _ <br /> mixture <br /> Receiving Notes <br /> There were no receiving discrepancies ' <br /> Analytical Notes <br /> There were no analytical discrepancies <br /> 'Definition of Data OualifvinE Flaes <br /> Seven qualifiers may have been used on the data analysis sheets and indicate as follows <br /> B - Compound present m laboratory blank greater than reporting lint. <br /> J - Estimated value ' <br /> E - Exceeds i nsinunent calibration range <br /> Page 2 of 9 ' <br />