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rofi s <br /> E Air loxics <br /> LABORATORY NARRATIVE <br /> Modified TO-14A <br /> SCS Field Services <br /> Workorder# 1204233 <br /> Three 1 Liter Summa Canister samples were received on April 12, 2012. 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 <br /> through a water management system to remove water vapor. Following dehumidification, the sample <br /> passes directly into the GUMS for analysis. <br /> This workorder was independently validated prior to submittal using 'USEPA National Functional <br /> Guidelines' as generally applied to the analysis of volatile organic compounds in air. A rules-based, <br /> logic driven, independent validation engine was employed to assess completeness, evaluate pass/fail of <br /> relevant project quality control requirements and verification of all quantified amounts. <br /> Method modifications taken to run these samples are summarized in the table below. Specific project <br /> requirements may over-ride the ATL modifications. <br /> Requirement TO-14A ATL Modifications <br /> Daily CCV +-30%Difference </=30%Difference with two allowed out up to</=40%.; <br /> flag and narrate outliers <br /> Initial Calibration criteria RSD<30% RSDS/=30%,two compounds allowed up to 40% <br /> BFB absolute abundance Within 10%of that CCV internal standard area counts are compared to <br /> criteria from previous day ICAL,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 /> BFB ion abundance criteria Ion abundance listed in Follow ion abundance criteria listed in Method TO-15 <br /> Table 4 of TO-14A <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> Dilution was performed on sample NC-SG6 due to the presence of high level non-target species. <br /> All Quality Control Limit exceedances and affected sample results are noted by flags. Each flag is <br /> defined at the bottom of this Case Narrative and on each Sample Result Summary page. <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 /> Page 3 of 20 <br />