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%% eurofins <br /> Air Toxics <br /> LABORATORY NARRATIVE <br /> Modified TO-3 <br /> Ground Zero Analysis, Inc. <br /> Workorder#2407175B <br /> Two 1 Liter Summa Canister samples were received on July 03, 2024. The laboratory performed <br /> analysis for volatile organic compounds in air via modified EPA Method TO-3 using gas <br /> chromatography with flame ionization detection. The TPH results are calculated using the response of <br /> Gasoline. A molecular weight of 100 is used to convert the TPH ppmv result to ug/L. The method <br /> involves concentrating up to 200 mL of sample. The concentrated aliquot is then dry purged to <br /> remove water vapor prior to entering the chromatographic system. <br /> Method modifications taken to run these samples are summarized in the table below. Specific project <br /> requirements may over-ride the ATL modifications. <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+3.3 S, <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 Flays <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 3 of 12 <br />