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FEB -10' 04(TUE) 14 54 AIRTOXICS LTD ML y10 153 tutu r uu�ruco <br /> LABORATORY NARRATIVE <br /> Modified TO-3 <br /> ' ENSR <br /> Workorder#0312494 <br /> ' Sixteen 1 Luer Sim=a Caniwter samples wane received on December 31, 2003, The laboratory performed <br /> analysis for volimle organic compounds in air ma modified EPA Method TO-3 using gas chromatography <br /> ' with photo ionization and flame iamxanon detection. The method involves cowerittating up to 200 mL of <br /> sample. The concentrated aliquot is thea dry purged to remove water vapor poor to eutenng the <br /> chmmatagtalahic system. The TPH (Gasoline Flange) results are calculated using the response Factor ai <br /> ' Gasoline and correspond to the range of hydrocarbons from CS to C 10. A molecular wei&of 100 n used <br /> to convert the TPH (Gies h= Range) ppuiv result to us(L,. See t e data sheets for the reporting lmuts for <br /> each compound <br /> Method mothficabrins taken to ruin these samples include: <br /> Requirement r0.9 ATL ModUkahons <br /> Daily Calibraxion Sian lard Pryor to samplt analysis Prior to sample analysis and after sho analytical batch<�—20 <br /> Frequency and every 4-6 Iris samples <br /> initial Calibration Calculauon 4-point calibration 5-point calibration using average Responso Factor <br />' using a Imear <br /> regression modal <br /> mina!Cahbmtion Frequency Weekly When daily ealibration standard recovery is outside 75- 125 <br /> %,or upon significant changes to procedure or <br /> instrumentation <br /> Moisture Control Nafion system Sorbent syatcrn <br /> Minimum Detection Limit(MDL) Calculated using the 40 CFR Pt. 136 App, B <br /> equation DL—At3 3S, <br /> where A is inteicept of <br /> calibration lino and S is <br />' the standard deviation <br /> of at leant 3 rets of low <br /> )oval standard <br /> Preparation of Standards Levels achieved Levels achieved through loading various volumes of the <br /> through dilution of gas gas mixture <br /> mauve <br />' Receiving Notes <br /> Sample MW23S was cancelled per client's request. <br />' Aftelydcal Notes <br /> There were no analytical disi:nj=cws- <br /> Definition of Data QdJeh'syllie>i <br /> Seven.qualifiers may have been used on the data atislyms sheets and indwaw as (allows <br /> B - Compound present m laboratory Wank grmater than reporting litrut <br /> eI- Estimated value. <br /> E- Exceeds =mrurricnt calbrationrange. <br />' S - Saturated peak. <br /> Q - Exceeds quality control limits <br /> Page 2 of 21 <br />