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G <br />n <br />u <br />AN ENVIRONMENTAL ANALYTICAL LABORATORY <br />LABORATORY NARRATIVE <br />Modified TO -14A <br />SCS Field Services <br />Workorder# 0703220 <br />Eight 1 Liter Summa Canister samples were received on March 08, 2007. The laboratory performed analysis <br />via modified EPA Method TO -14A using GUMS in the full scan mode. The method involves concentrating <br />up to 0.2 liters of air. The concentrated aliquot is then flash vaporized and swept through a water <br />' management system to remove water vapor. Following dehumidification, the sample passes directly into the <br />GUMS for analysis. <br />h <br />I <br />r <br />0 <br />Method modifications taken to nm these samples are summarized in the below table. Specific project <br />requirements may over -ride the ATL modifications. <br />Requirement <br />TO -14A <br />ATL Modifications <br />Daily CCV <br />+- 30% Difference <br /></= 30% Difference with two allowed out up to </=40%.; <br />flag and narrate outliers <br />Initial Calibration criteria <br />RSD<30% <br />RSD</=30%, two compounds allowed up to 40% <br />BFB absolute abundance criteria <br />Within 10% of that <br />from previous day <br />CCV internal standard area counts are compared to ICAL, <br />corrective action for > 40% D <br />Blank acceptance criteria <br /><0.20 ppbv <br /><Reporting Limit <br />Moisture control <br />Nafion Dryer <br />Multisorbent trap <br />Sample collection media <br />Summa canister <br />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 />All Quality Control Limit failures and affected sample results are noted by flags. Each flag is defined at the <br />bottom of this Case Narrative and on each Sample Result Summary page. <br />Dilutionwas performed on sample SG -8 due to the presence of high level non -target species. <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 not <br />performed). <br />J - Estimated value. <br />E - Exceeds instrument calibration range. <br />S - Saturated peak. <br />Q - Exceeds quality control limits. <br />Page 2 of 30 <br />