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ETA <br /> SUEL <br /> AN ENVIRONMENTAL ANALYTICAL LABORATORY <br /> LABORATORY NARRATWE <br /> Modified TO-14A <br /> SCS Field Services <br /> Workorder#0703032 <br /> Seven 1 Liter Summa Canister samples were received on March 01, 2007. The laboratory performed <br /> analysis via modified EPA Method TO-14A using GUMS in the full scan mode. The method involves <br /> concentrating up to 0.2 liters of air. The concentrated aliquot is then flash vaporized and swept through a <br /> water management system to remove water vapor. Following dehumidification, the sample passes directly <br /> into the GUMS for analysis. <br /> Method modifications taken to run these samples are summarized in the below table. Specific project <br /> requirements may over-ride the ATL modifications. <br /> Requirement TO-14A ATL Modifications <br /> Daily CCV +-300%Difference </=30%Difference with two allowed out up to</=40%.; <br /> flag and narrate outliers <br /> Initial Calibration criteria RSD<30% RSD</=30%,two compounds allowed up to 40% <br /> BFB absolute abundance criteria Within 10%of that CCV internal standard area counts are compared to ICAL, <br /> from previous day corrective action for>40%D <br /> Blank acceptance criteria <0.20 ppbv <Reporting Limit <br /> Moisture control Nafion Dryer Multisorbent trap <br /> Sample collection media Summa canister ATL recommends use of summa canisters to insure data <br /> defensibility,but will report results from Tedlar bags at <br /> client request <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> There were no analytical discrepancies. <br /> Definition of Data Qualifying 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 no <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 <br /> N- The identification is based on presumptive evidence. <br /> Page 2 of 26 <br />