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eurofins <br /> Air Taxics <br /> LABORATORY NARRATIVE <br /> EPA Method TO-15 Soil Gas <br /> Brusca Associates, Inc. <br /> Workorder# 2308374B <br /> One 1 Liter Summa Canister sample was received on August 16, 2023. The laboratory performed analysis <br /> via EPA Method TO-15 using GC/MS in the full scan mode. The method involves concentrating up to 50 <br /> mLs of air. The concentrated aliquot is then flash vaporized and swept through a water management <br /> system to remove water vapor. Following dehumidification, the sample passes directly into the GC/MS <br /> for analysis. <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> Dilution was performed on sample SHROUD due to the presence of high level target species. <br /> Definition of Data Qualifying Flats <br /> Eight 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 /> 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 /> r1-File was requantified for the purpose of reissue <br /> Page 3 of 9 <br />