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LABORATORY NARRATIVE <br /> Modified TO-3 <br /> ENSR <br /> Workorder# 0502371 <br />' Three 1 Liter Tedlar Bag samples were received on February 18, 2005 The laboratory performed analysis <br /> for volatile organic compounds in air via modified EPA Method TO-3 using gas chromatography with photo <br /> ionimtton 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 using 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 /> Requirement TO-3 ATC 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 Detection Limit(MDL) Calculated using the 40 CFR Pt 136 App 13 <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 <br /> through dilution of gas gas mixture <br /> mixture <br /> Receiving Notes <br /> There were no receiving discrepancies <br /> Analytical Notes <br /> There were no analytical discrepancies <br /> Definition of Data Oualifying Fla s <br /> Seven qualifiers may have been used on the data analysts sheets and indicate as follows <br /> B - Compound present in laboratory blank greater than reporting limit <br />' J - Estimated value <br /> E - Exceeds instrument calibration range <br /> 5 - Saturated peak <br /> Page 2 of 9 <br />