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Air <br /> Toxics au <br /> Laboratory Services Since 1989 <br /> LABORATORY NARRATIVE <br /> Modified ASTM D-1946 <br /> Parsons <br /> Workorder#0904384B <br /> Eight 6 Liter Sunnna Canister samples were received on April 17, 2009. The laboratory performed analysis <br /> via Modified ASTM Method D-1946 for Helium in air using GC/TCD. The method involves direct injection <br /> of 1.0 mL of sample. <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 ASTMD-1946 ATL Modifications <br /> Calibration A single point A 3-point calibration curve is performed.Quantitation is <br /> calibration is performed based on a daily calibration standard which may or may <br /> using a reference not resemble the composition of the associated samples. <br /> standard closely <br /> matching the <br /> composition of the <br /> unknown. <br /> Reference Standard The composition of any The standards used by ATL are blended to a>/=95% <br /> reference standard accuracy. <br /> must be known to <br /> within 0.01 mol%for <br /> any component. <br /> Sample Injection Volume Components whose The sample container is connected directly to a fixed <br /> concentrations are in volume sample loop of 1.0 mL on the GC. Linear range is <br /> excess of 5 %should defined by the calibration curve.Bags are loaded by <br /> not be analyzed by vacuum. <br /> using sample volumes <br /> greater than 0.5 mL. <br /> Normalization Normalize the mole Results are not normalized. The sum of the reported <br /> percent values by values can differ from 100%by as much as 15%,either due <br /> multiplying each value to analytical variability or an unusual sample matrix. <br /> by 100 and dividing by <br /> the sum of the original <br /> values.The sum of the <br /> original values should <br /> not differ from 100%by <br /> more than 1.0%. <br /> Precision Precision requirements Duplicates should agree within 25%RPD for detections> <br /> established at each 5 X's the RL. <br /> concentration level. <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> There were no analytical discrepancies. <br /> Page 3 of 17 <br />