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Air , <br /> TOXICS crn. <br /> ' AN ENVIRONMENTAL ANALYTICAL LABORATORY <br /> LABORATORY NARRATIVE <br /> ' Modified TO-3 <br /> PSC Industrial Outsourcing LP <br /> Workorder##0902029BRI <br /> Eight 1 Liter Summa Canister samples were received on February 02, 2009. The laboratory performed <br /> analysis for volatile organic compounds in air via modified EPA Method TO-3 using gas chromatography <br /> ' with 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. <br /> The TPH(Gasoline Range) results are calculated using the response factor of Gasoline. A molecular weight <br /> of 100 is used to convert the TPH(Gasoline Range)ppmv result to ug/L. <br /> ' Method modifications taken to nin these samples are summarized in the table below. Specific project <br /> requirements may over-ride the ATL modifications. <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 40 CFR Pt. 136 App. B <br /> equation DL=A+3.3 S, <br /> where A is intercept of <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 /> ' Sample SG-4 was received with significant vacuum remaining in the canister. The residual canister vacuum <br /> resulted in elevated reporting limits. <br /> ' Analytical Notes <br /> There were no analytical discrepancies. <br /> ' THE WORK ORDER WAS REISSUED ON FEBRUARY 19, 2008 TO CORRECT THE <br /> IDENTIFICATION OF SAMPLE SG-1DUP PER CLIENT REQUEST. <br /> ' Page 2 of 16 <br />