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LABORATORY NARRATIVE <br /> Modified TO-3 <br /> ENSR <br /> Workorder# 0403147RI <br /> Sixteen 1 Liter Summa Canister samples were received on March 08, 2004 The laboratory performed <br /> ' analysis for volatile organic compounds in air via modified EPA Method TO-3 using gas <br /> chromatography with photo ionization and flame ionization detection The method involves <br /> concentrating up to 200 mL of sample The concentrated aliquot is then dry purged to remove water <br /> vapor prior to entering the chromatographic system The TPH (Gasoline Range) results are calculated <br /> using the response factor of Gasoline and correspond to the range of hydrocarbons from C5 to C10 A <br /> molecular weight of 100 is used to convert the TPH (Gasoline Range) ppmv result to ug/l, <br /> ' 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 Prior to sample analysis and after the analytical batch</= <br /> Frequency analysis and every 4-6 20 samples <br /> hrs <br /> Initial Calibration Calculation 4-pomt 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 Calculated using the 40 CFR Pt 136 App B <br /> (MDL) 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 <br /> low 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 /> The chain of custody information for samples VEW-7 and VEW-8 did not match the entries on the <br /> sample tags The discrepancy was noted in the Login email and the information on the cham of custody <br /> was used to process and report the samples <br /> Sample VEW-2 was received with significant vacuum remaining in the canister The discrepancy was <br /> noted in the Login email The residual canister vacuum resulted in elevated reporting limits <br /> e Analytical Notes <br /> There were no analytical discrepancies <br /> THE WORKORDER WAS REISSUED ON 03/30/04 TO REPORT AN ADDITIONAL COMPOUND <br />' MTBE PER CLIENT'S REQUEST <br /> Page 2 of 23 <br />