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LABORATORY NARRATIVE <br /> Modified TO-3 <br /> ' Geological Technics <br /> Workorder#0412160 <br /> ' Three i Liter Tedlar Ba samples were received on December 08 2004 The laboratory performed anal is <br /> Bag p i3'p ys <br /> ' for volatile organic compounds m air via modified EPA Method TO-3 using gas chromatography with photo <br /> ionization and flame ionization detection The method involves concentrating up to 200 mL of sample The <br /> concentrated aliquot is then dry purged to remove water vapor prior to entering the chromatographic system <br /> ' The TPH(Gasoline Range)results are calculated usmg the response factor of Gasoline and correspond to the <br /> range of hydrocarbons from C5 to C10 A molecular weight of 100 is used to convert the TPH (Gasoline <br /> Range)ppmv result to ug/L 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 Pnor 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 /> t 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 /> mixtureReceiviniz Notes <br /> ' Sample identifications on the chain of custody were not unique The time of collection was added to the <br /> identification to assure uniqueness <br /> ' Analytical Notes <br /> There were no analytical discrepancies <br /> Definition of Data QualiFlags <br /> 1 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 lu it <br /> J- Estunated value <br /> E- Exceeds instrument calibration range <br /> ' Page 2 of 10 <br />