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LABORATORY NARRATIVE <br /> Modified TO-3 <br /> ENSR <br /> Workorder# 0404606 <br /> Fifteen 1 Liter Summa Canister samples were received on April 30, 2004 The laboratory performed <br />' analysis for volatile organic compounds in air via modified EPA Method TO-3 using gas chromatography <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 Targe of hydrocarbons from C5 to C 10 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 reportirig linuts for <br /> 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</=20 <br />' Frequency and every 4-6 hrs 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- 125 <br /> %,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 <br /> low level standard <br />' Preparation of Standards Levels achieved Levels achieved through loading various volumes of the gas <br /> through dilution of gas nuxture <br /> mixture <br />' Receivine„Notes <br /> e The chain of custody information for sample VEW4 did not match the entry on the sample tag The <br /> discrepancy was noted in the Sample Reccipt Confirmation email/fax and the information on the chaui of <br /> custody was used to process and report the sample <br />' Analytical Notes <br /> The detection of Ethyl Benzene may have been masked in samples VEW13A, VEW5 and VEW1A due to <br /> complex hydrocarbon interference <br /> Definition of Dataiiali in Fla s <br /> Seven qualifiers may have been used on the data analysis sheets and indicate as follows <br />' B - Compound present in laboratory blank greater than reporting limit. <br /> Page 2 of 22 <br />