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MAir <br /> Toxics LTD <br /> AN ENVIRONMENTAL ANALYTICAL LABORATORY <br /> LABORATORY NARRATIVE <br /> Modified TO-15 <br /> Parsons <br /> Workorder#0807311 <br /> Eighteen 6 Liter Summa Canister samples were received on July 17, 2008. The laboratory performed <br /> analysis via modified EPA Method TO-15 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 through a <br /> water management system to remove water vapor. Following dehumidification, the sample passes directly <br /> into the GUMS for 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 /> Specific analytes that are requested by the client to be reported as tentatively identified compounds (TICs) <br /> are determined by searching for each compound's characteristic spectra. If no chromatographic peak <br /> displaying the compound specific spectra exists, then the TIC is reported as not detected. Please note that <br /> the laboratory has not evaluated the stability of any heretofore tentatively identified compound in the vapor <br /> phase or for efficiency of recovery through the analytical system. <br /> The reported result for 4-Ethyltoluene in samples C2-SG1 and B1-SG1D may be biased high due to <br /> co-elution with a non target compound with similar characteristic ions. Both the primary and secondary ion <br /> for 4-Ethyltoluene exhibited potential interference. <br /> Page 3 of 57 <br />