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lie <br /> LABORATORY NARRATIVE <br /> Modified TO-3 <br /> Ground Zero Analysis, Inc. <br /> I ' Workorder#0508424 <br /> ' Five 1 Liter Tedlar Bag samples were received on August 19, 2005. 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 TPH results are calculated using the response of Gasoline. A <br /> molecular weight of 100 is used to convert the TPH pprnvresult to ug/L. The method involves concentrating <br /> up to 200 mL of sample. The concentrated aliquot is then dry purged to remove water vapor prior to <br /> ' entering the chromatographic system. See the data sheets for the repotting limits for each compound. <br /> 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 /> 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+3.3S, <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 /> mixture <br /> ' Receiving_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 /> ' E- Exceeds instrument calibration range. <br /> S - Saturated peak. <br /> Q - Exceeds quality control limits. <br /> ' U- Compound analyzed for but not detected above the detection limit <br /> Page 2 of 13 <br />