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' LABORATORY NARRATIVE <br /> Modified TO-3 <br /> ' Ground Zero Analysis, Inc. <br /> Workorder# 0502230R1 <br /> Three 1 Liter Tedlar Bag samples were received on February 10, 2005. The laboratory performed <br /> ' analysis for volatile organic compounds in air via modified EPA Method TO-3 using gas <br /> chromatography with photo ionization and flame ionization detection. The TPH results are calculated <br /> ' using the response of Gasoline. A molecular weight of 100 is used to convert the TPH ppmv result to <br /> ug/L. The method involves concentrating up to 200 mL of sample. The concentrated aliquot is then <br /> dry purged to remove water vapor prior to entering the chromatographic system. See the data sheets <br /> I ' 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 Calculated using the 40 CFR Pt. 136 App. B <br /> (MDL) 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 /> Receivine Notes <br /> ' There were no receiving discrepancies. <br /> Analytical Notes <br /> ' The recovery of surrogate Fluorobenzene in sample KR Influ was outside control limits due to high <br /> level hydrocarbon matrix interference. Data is reported as qualified. <br /> ' THE WORK ORDER WAS REISSUED ON FEBRUARY 17,2005 TO CORRECT THE ANALYTE <br /> LIST, PER CLIENT'S REQUEST. <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 /> Page 2 of 10 <br />