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C <br />eurof ins <br />LABORATORY NARRATIVE <br />Modified TO -14A <br />SCS Field Services <br />Workorder# 1208188 <br />Ten 1 Liter Summa Canister samples were received on August 08, 2012. The laboratory performed <br />analysis via modified EPA Method TO -14A using GC/MS 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 GC/MS 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 />reauirements may over -ride the ATL modifications. <br />Requirement <br />TO -14A <br />ATL Modifications <br />Initial Calibration criteria <br />RSD</=30% <br />Follow TO -15 requirements of RSD</=30% with two <br />compounds allowed out to </=401/oRSD. <br />BFB absolute abundance <br />criteria <br />Within 10% of that <br />from previous day <br />CCV internal standard area counts are compared to <br />ICAL, corrective action when recovery is less than 60%. <br />Blank acceptance criteria <br /><0.20 ppbv <br /><Reporting Limit <br />Sample Drying System <br />Nafion Dryer <br />Multibed hydrophobic sorbent <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 />BFB ion abundance criteria <br />Ion abundance listed in <br />Table 4 of TO -14A <br />Follow ion abundance criteria listed in Method TO -15 <br />Receiving Notes <br />There were no receiving discrepancies. <br />Analytical Notes <br />Dilution was performed on samples SG10 and SGO1 due to the presence of high level target species. <br />Dilution was performed on sample SG07 due to the presence of high level non -target species. <br />Bromomethane had high recoveries in the daily CCV and LCS/LCSD outside method and laboratory <br />acceptance criteria. Associated samples had no detections for Bromomethane. <br />AllQ tY uali Control Limit exceedences 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. Target <br />Page 3 of 35 <br />