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LABORATORY NARRATIVE <br /> Modified TO-3 <br /> ENSR <br /> Workorder# 0505610 <br /> Fourteen 1 Liter Summa Canister and one 1 Liter Silomte Canister samples were received on May 27, 2005 <br /> The laboratory performed analysis for volatile organic compounds in air via modified EPA Method TO-3 <br /> using gas 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 vapor <br /> prior to entering the chromatographic system The TPH (Gasoline Range)-results are calculated using the <br /> response factor of Gasoline and correspond to the range of hydrocarbons from C5 to C10 A molecular <br /> weight of 100 is used to convert the TPH (Gasoline Range)ppmv result to ug/L See the data sheets for the <br /> 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 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 Detectton L.irnrt(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 T <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 /> Receivine Notes <br /> According to the Chain of Custody (COC), samples VEW-6, VEW-7A, VEW-$A, VEW-9A, VEW-1OA, <br /> VEW-11A, VEW-12A, VEW-13A, MW-19S and MW-25S were collected on 5/27/05 and 2/23/05 <br />- However,the sample tags reflect a collection date of 5/26/05 The discrepancy was noted in the Sample <br /> Receipt Confirmation email/fax and the dates on the sample tags were used to calculate the sample holding <br /> time <br /> Analytical Notes • <br /> _ <br /> There were no analytical discrepancies <br /> Page 3 of 29 <br />