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Air <br /> Toxicsua <br /> Laboratory Services Since 489 <br /> LABORATORY NARRATIVE <br /> EPA Method TO-17 <br /> Stantec Consulting Corporation <br /> Workorder# 1109412 <br /> Five TO-17 VI Tube samples were received on September 22, 2011. The laboratory performed the <br /> analysis via EPA Method TO-17 using GUMS in the full scan mode. TO-17 sorbent tubes are thermally <br /> desorbed onto a secondary trap. The trap is thermally desorbed to elute the components into the GUMS <br /> system for further separation. <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> A sampling volume of 0.59 L was used to convert ng to ug/m3 for the associated Lab Blank and sample <br /> Trip Blank. <br /> The TPH pattern in samples SV-INF, SWNF2, SWNF3 and SWNFCOMB did not resemble that of <br /> diesel fuel. The hydrocarbons were distributed in the lighter carbon range of diesel. <br /> Definition of Data Oualifying Flags <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. <br /> UJ-Non-detected compound associated with low bias in the CCV and/or LCS. <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 /> rl-File was requantified for the purpose of reissue <br /> Page 3 of 13 <br />