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LABORATORY NARRATIVE <br /> L, Modified TO-3 <br /> Geological Technics <br /> Workorder#0504240 <br /> Two 1 Liter Tedlar Ba were received on <br /> Bag samples p April 13, 2005. The laboratory performed analysis for <br /> volatile organic compounds in air via modified EPA Method TO-3 using gas chromatography with photo <br /> rionization and flame ionization detection. The method involves concentrating up to 200 mL of sample. The <br /> L 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 /> Lrange of hydrocarbons from C5 to C 10. A molecular weight of 100 is used to convert the TPH (Gasoline <br /> Range)ppmv result to ug/L. <br /> LSee the data sheets for the reporting limits for each compound. <br /> Method modifications taken to run these samples include: <br /> L 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 /> L, 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. B <br /> equation DL=A+3.3 S, <br /> L; where A is intercept of <br /> calibration line and S is <br /> the standard deviation <br /> L 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 /> L through dilution of gas gas mixture <br /> mixture <br /> ReceivinLy Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> There were no analytical discrepancies. <br /> Definition of Data Qualifying Flags <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 /> J- Estimated value. <br /> i Page 2 of.9 <br />