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eurofins <br /> Air Taxics <br /> LABORATORY NARRATIVE <br /> EPA Method TO-15 <br /> Brusca Associates, Inc. <br /> Workorder# 2308374A <br /> One 1 Liter Summa Canister sample was received on August 16, 2023. The laboratory performed analysis <br /> via EPA Method TO-15 using GUMS in the full scan mode. <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> A single point calibration for TPH referenced to Gasoline was performed for each daily analytical batch. <br /> Recovery is reported as 100% in the associated results for each CCV. <br /> Non-standard compounds may have different acceptance criteria than the standard TO-14A/TO-15 <br /> compound list as per contract or verbal agreement. <br /> The presence of a closely eluting non-target peak in sample SG3 is interfering with the <br /> quantitation mass ion for 4-Ethyltoluene. The reported 4-Ethyltoluene concentration is flagged <br /> with a "CN" flag to indicate a high bias due to matrix contribution. <br /> All Quality Control Limit exceedances and affected sample results are noted by flags. Each flag is defined <br /> at the bottom of this Case Narrative and on each Sample Result Summary page. <br /> Definition of Data Qualifying Flags <br /> Ten qualifiers may have been used on the data analysis sheets and indicates as follows: <br /> B - Compound present in laboratory blank greater than reporting limit(background subtraction not <br /> performed). <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 reporting limit, LOD, or MDL value. See <br /> data page for project specific U-flag definition. <br /> UJ-Non-detected compound associated with low bias in the CCV <br /> N - The identification is based on presumptive evidence. <br /> M - Reported value may be biased due to apparent matrix interferences. <br /> CN - See Case Narrative. <br /> File extensions may have been used on the data analysis sheets and indicates <br /> as follows: <br /> a-File was requantified <br /> b-File was quantified by a second column and detector <br /> rl-File was requantified for the purpose of reissue <br /> Page 3 of 14 <br />