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LABORATORY NARRATIVE <br /> Modified Method TO-14A <br /> San Joaquin County,Solid Waste/Public Works <br /> Workorder#0308153A <br /> Two 6 Liter Summa Canister samples were received on August 07, 2003. The laboratory performed analysis <br /> via modified EPA Method TO-14A using GC/MS in the full scan mode. The method involves concentrating <br /> up to 0.5 liters of air. The concentrated aliquot is then flash vaporized and swept through a water <br /> management system to remove water vapor. Following dehumidification, the sample passes directly into the <br /> GC/MS for analysis. See the data sheets for the reporting limits for each compound. <br /> Method modifications taken to run these samples include: <br /> Requirement TO-14A ATL Modifications <br /> Continuing Calibration criteria </=30%Difference </=30%Difference with two allowed out to</=40% <br /> Difference;flag and narrate outliers <br /> Initial Calibration criteria RSD<30% RSD</=30%,two compounds allowed up to 40%. <br /> Moisture control Nafton Dryer Multisorbent trap <br /> Blank acceptance criteria <0.20 ppbv <Reporting Limit <br /> Primary ions for Quantification Freon 114: 85,Carbon Freon 114: 135,Carbon Tetrachloride:119,Trichloroethene: <br /> Tetrachloride: 117, 95,Ethyl Benzene,m,p-and o-Xylene: 106 <br /> Trichloroethene: 130, <br /> Ethyl Benzene,m,p- <br /> and o-Xylene:91 <br /> Dilutions for Initial Calibration Dynamic dilutions or Syringe dilutions <br /> static using canisters <br /> BFB absolute abundance criteria Within 10%of that CCV surrogate recoveries demonstrate stability <br /> from previous day. <br /> Sample Load Volume 400 mL Varied to 200 mL <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> The following compound, Chloroethane, indicated low bias (less than 70% expected recovery) in the daily <br /> CCV analyzed on 08/08/03. Associated non-detects in samples FHEMP-SG1-080403a and <br /> FHEMP-LFG-080403 were flagged to indicate estimated results with low bias. <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 Emit (background subtraction nol <br /> performed). <br /> J- Estimated value. <br /> E -Exceeds instrument calibration range. <br /> S - Saturated peak. <br /> Q -Exceeds quality control limits. <br /> Page 2 of 13 <br />