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LABORATORY NARRATIVE <br /> LT Modified TO-3 <br /> Geological Technics <br /> r., <br /> Workorder#0407517 <br /> �- Three 1 Liter Tedlar Bag samples were received on July 28, 2004. The laboratory performed analysis for <br /> volatile organic compounds in 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 using the response factor of Gasoline and correspond to the <br /> range of hydrocarbons fiom C5 to C10. A molecular weight of 100 is used to convert the TPH (Gasoline <br /> `'' a Ran my result to <br /> Range)pp 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 Prior to sample analysis Prior to sample analysis and atter 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+3.3 S, <br /> where A is intercept of <br /> calibration line and S is <br /> the standard deviation <br /> LN of at least 3 reps of <br /> low level standard <br /> Preparation of Standards Levels achieved Levels achieved through loading various volumes of the gaq <br /> through dilution of gas mixture <br /> mixture <br /> Lo Receiving otes <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 /> L' Analytical Notes <br /> There were no analytical discrepancies. <br /> Definition of Data OuaUj&gFlags <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 /> E - Exceeds instrument calibration range. <br /> �- S - Saturated peak. <br /> Page 2 of 9 <br /> 4 <br />