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LABORATORY NARRATIVE <br />' Modified TO-3 <br /> . ENSR <br /> Workorder#0502079 <br /> Thirteen 1 Liter Summa Canister samples were received on February 03, 2005 The laboratory performed <br />' <br /> analysis for volatile organic compounds in air via modified EPA Method TO-3 using gas chromatography <br /> g <br /> with photo ionization and flame ionization detection The method involves concentrating up to 200 mL of <br />' sample The concentrated aliquot is then dry purged to remove water vapor prior to entering the <br /> chromatographic system The TPH (Gasoline Range) results are calculated using the response factor of <br />' Gasoline and correspond to the range of hydrocarbons from C5 to C10 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 reporting hrmts for <br /> each compound <br /> 1 ' <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 /> l <br /> Initial Calibration Frequency Weekly When daily calibration standard recovery is outside 75 - <br /> ie 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 3S, <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 /> m ixture <br />' Receiving Notes <br /> The Chani of Custody (COC) information for sample VEW-13 did not match the entry on the sample tag <br /> with regard to sample iclentificatton The discrepancy was noted in the Sample Receipt Confni-tation <br /> email/fax and the information on the COC was used to process and report the sample <br /> Sample VEW-9 was received with significant vacuum remaining in the canister The client was notified and <br /> requested the sample be cancelled <br /> Analytical Notes <br /> There were no analytical discrepancies <br /> Page 2 of 19 <br />