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Page 2 of 11 <br /> Case Narrative <br /> Work Order# 10-07-1508 <br /> Modified EPA TO-14A or EPA TO-15 <br /> EPA Methods TO-14A and TO-15 describe gas chromatographic procedures that will allow for that <br /> separation of volatile organic compounds and their qualitative and quantitative analysis by mass <br /> spectrometry (GUMS). A known volume of sample is directed from the container (Summa® canister or <br /> TedlarTm bag) through a solid multi-module (glass beads, tenex, cryofocuser) concentrator. Following <br /> concentration, the VOCs are thermally desorbed onto a gas chromatographic column for separation and <br /> then detected on a mass selective detector. <br /> Comparison of EPA TO-14A/TO-15 versus Calscience EPA TO-14A/TO-15 (Modified) <br /> Requirement.. EPA Method . Calscience'Modifications = ':. <br /> BFB Acceptance Criteria CLP Protocol SW846 Protocol <br /> Initial Calibration Allowable % RSD for Allowable % RSD for each Target <br /> each Target Analyte <= 30%, Analyte <= 30%, 10%of analytes <br /> two analytes allowed <= 40% allowed <= 40% <br /> Initial Calibration Verification Not Mentioned Analytes contained in the LCS <br /> (ICV)- standard evaluated against historical <br /> Second Source Standard (LCS) control limits for the LCS <br /> Daily Calibration Verification Allowable % Difference for each Full List Analysis: <br /> (CCV) Target Analyte is<= 30% Allowable /o Difference for each CCC <br /> analyte is<=30% <br /> Target List Analysis: <br /> Allowable % Difference for each target <br /> analytes is<= 30% <br /> Daily Calibration Verification Allowable+/-40% Allowable+/-50% <br /> (CCV)- (Range: 60%to 140°/x) (Range: 50%to 150%) <br /> Internal Standard Area Response <br /> Method Blank, Laboratory Control Allowable +/-40%of the mean area Allowable +/-50% of the mean area <br /> Sample and Sample- Internal response of most recent Initial response of the most recent <br /> Standard Area Response Calibration Calibration Verification <br /> (Range: 60%to 140%) (Range: 50%to 150%) <br /> Surrogates Not Mentioned 1,4-Bromoflurobenzene, <br /> 1,2-Dichloroethane-d4 and <br /> Toluene-d8 - % Recoveries based <br /> upon historical control limits+/-3S <br />