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LABORATORY NARRATIVE <br /> Modified TO-3 <br /> Ground Zero Analysis,Inc. <br /> Workorder#0508181 <br /> Three I Liter Tedlar Bag samples were received on August 08, 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 ppmv result 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 reporting 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 CFA Pt. 136 App. B <br /> equation DL=A+3.3S, <br /> where A is intercept of <br /> calibration line and 5 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 /> Receivint±Notes <br /> There were no receiving discrepancies. <br /> Analvtical Notes <br /> The recovery of surrogate Fluorobenzene in samples TW Iiillu#1 and TW Influ#2 was outside control limits <br /> due to high level hydrocarbon matrix interference. Data is reported as qualified. <br /> Definition of Data Qualifving 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 /> Page 2 of 10 <br />