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EAI*r <br />_. .. _. :. .a. <br />Laboratory Services Since 1989 <br />LABORATORY NARRATIVE <br />Modified TO -14A Std & Soil Gas <br />SCS Field Services <br />Workorder# 1003147 <br />Thirteen 1 Liter Summa Canister samples were received on March 05, 2010. The laboratory <br />performed analysis via modified EPA Method TO -14A using GC/MS in the Full Scan mode. The <br />method involves concentrating up to 1.0 liter of air. The concentrated aliquot is then flash vaporized <br />and swept through a water management system to remove water vapor. Following dehumidification, <br />the sample 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 <br />of 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 <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 <br />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 />Samples were received past the recommended hold time of 30 days. Analysis proceeded. <br />Analvtical Notes <br />All Quality 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 />compound non -detects in the samples that are associated with high bias in QC analyses have not been <br />flagged. <br />Dilution was performed on samples FH-SG8, FH-SG7 and FH -SGT (CH4 Present) due to the <br />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 />Page 4 of 55 <br />• <br />