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' LABORATORY NARRATIVE Modified TO-3 (Gas range) ' ENSR Workorder#0408614 ' Fourteen 1 Liter Summa Canister samples were received on August 31, 2004 The laboratory performed analysis for volatile organic compounds in air via. modified EPA Method TO-3 using gas chromatography with photo ionization and flame ionization detection The method involves concentrating up to 200 mL of sample The concentrated aliquot is then dry purged to remove water vapor prior to entenng the chromatographic system The TPH (Gasoline Range) results are calculated using the response factor of Gasoline and correspond to the range of hydrocarbons from C5 to C 10 A molecular weight of 100 is used ' to convert the TPH (Gasoline Range) ppmv result to ug/L See the data sheets for the reporting limits for each compound ' Method modifications taken to run these samples include Requirement TO-3 ATL Modifications ' Daily Calibration Standard Prior to sample analysis Prior to sample analysts and after the analytical batch</= Frequency and every 4-6 hrs 20 samples Initial Calibration Calculation 4-point calibration 5-point calibration using average Response Factor using a linear regression model Initial Calibration Frequency Weekly When daily calibration standard recovery is outside 75 - ' 125% or upon significant changes to procedure or instrumentation Moisture Control Nafion system Sorbent system Minimum Detection Limit(MDL) Calculated using the 40 CFR Pt 136 App B equation DL=A}3 3S, ' where A is intercept of calibration line and S is the standard deviation of at least 3 reps of ' low level standard Preparation of Standards Levels achieved Levels achieved through loading various volumes of the through dilution of gas gas mixture ' mixture Receiving Notes The Chain of Custody (COC) information for samples VEW-2,VEW-6,VEW-7, VEW-8, VEW-9, VEW-10, VEW-11 and VEW-12 did not match the entries on the sample tags with regard to sample identification The discrepancy was noted in the Sample Receipt Confiri-nation email/fax and the information on the COC was used to process and report the samples The Chain of Custody (COC:) information for samples VEW-8 and VEW-12 did not match the entries on the sample canisters in regard to the can numbers The discrepancy was noted in the Sample Receipt ' Confirmation email/fax and the information on the cans were used to process and report the samples ' Page 3 of 25