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� i y <br /> 3 <br /> LABORATORY NARRATIVE <br /> , <br /> Modified TO-3 <br /> ENSR <br /> " Workorder# 0411246 <br /> f <br /> .- <br /> _ Thirteen 1 Liter Summa Canister samples were received on November, 12,1004 The laboratory performed <br /> analysis for volatile,organic compounds'm air via modified EPA Method TO-3 using gas chromatography, <br /> ' - - with photo ionization-and flame ionization*detection-- The method involves conceritratmg up to 200 mL of - <br /> sample The concentrated aliquot is then dry purged to remove water vapor,'pt7or to entering the <br /> chromatographic system , The�TPH-(Gasolme Range),results are calculated usmg the response factor of <br /> Gasoline and correspond to the range of hydrocarbons from,C5 to CIO A molecular weight of 100 is used <br /> to convert the TPH (Gasoline Range) ppmv result to ug/L See the data sheets for the reportmg bits far <br /> each compound <br /> Method modifications taken to nun these samples include <br /> Requirement ` TO-3 ATL Modrf cattons <br /> Daily Calibration Standard Prior to sample analysis Prior to sample analysis and after the analytical batch</M <br /> Frequency and every 4 1,6 hrs 20 samples <br /> -x w Initial Calibration Calculation -4-point calibration- 5-point calibration using average Response Factor- <br /> - 1 <br /> using a linear, <br /> regression model <br /> , <br /> I-- <br /> Initial Calibration Frequency Weekly, '+ _ When daily calibration standard recovery is outside 75- <br /> 125,%, or upon significant changes to Procedure or <br /> , <br /> instrumentation <br /> viutSturC CuiltToi 'va�un SyStCiJ .Civrb�irt SyStCill <br /> -Mlnlmum Detecbon Limit(MDL) Calculated using the —40 CFR Pt=136 AprB — <br /> equation DL=A+3 3S, <br /> _ -where A rs interoepCof <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 /> Receiving Notes ' <br /> There were no receiving discrepancies <br /> Analytical Notes <br /> T There were no analytical disdrepancies - a - <br /> Definition of Data Qualifvmg�Flags <br /> Seven quahfiers may have been used on the data analysis sheets and indicate as follows ' <br /> B - Compound present it laboratory blank greater than reporting limit <br /> J- Estimated value <br /> Page 3 of 24 <br />