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Air <br /> Toxics au <br /> Laboratory Services Since 1989 <br /> LABORATORY NARRATIVE <br /> Modified TO-15 <br /> Parsons <br /> Workorder#0904384A <br /> Eight 6 Liter Sunuma Canister samples were received on April 17, 2009. The laboratory performed analysis <br /> via modified EPA Method TO-15 using GUMS in the full scan mode. The method involves concentrating up <br /> to 0.2 liters of air. The concentrated aliquot is then flash vaporized and swept through a water management <br /> system to remove water vapor. Following dehumidification, the sample passes directly into the GUMS for <br /> analysis. <br /> This workorder was independently validated prior to submittal using'USEPA National Functional Guidelines' <br /> as generally applied to the analysis of volatile organic compounds in air. A rules-based, logic driven, <br /> independent validation engine was employed to assess completeness, evaluate pass/fail of relevant project <br /> 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-15 ATL Modifications <br /> Daily CCV </=30%Difference </=30%Difference;Compounds exceeding this criterion <br /> and associated data are flagged and narrated. <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 /> Method Detection Limit Follow 40CFR Pt.136 The MDL met all relevant requirements in Method TO-15 <br /> App.B (statistical MDL less than the LOQ).The concentration of <br /> the spiked replicate may have exceeded l OX the calculated <br /> MDL in some cases <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. Target compound non-detects in <br /> the samples that are associated with high bias in QC analyses have not been flagged. <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 /> Page 3 of 36 <br />