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Sequoia • 1455 McDowll Blvd North Ste D <br /> Petatum;,CA 94954 <br /> 65 <br /> Analytical .scquoudabs 342 <br /> vnvw.sequoialabs.com <br /> MACTEC E&C-Petaluma ProjeccGeneral Commercial P412379 <br /> 5341 Old Redwood Highway,Suite 300 Project Number:Sears/Tracy-UST/AST-3205040383.02 Reported: <br /> Petaluma CA,94954 Project Manager:Gary Lieberman 01/05/05 10:53 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> ' Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analym Result Limit Units Level Result %REC Limits RPD Limit No, <br /> ' Batch 5010020-EPA 5030 soils/EPA 8260B <br /> Laboratory Control Sample(5010020-BSI) Prepared&Analyzed:01/03/05 <br /> Benzene 45.4 5.0 ug/kg 50.0 91 75-123 <br /> Chlorobenzene 47.4 5.0 50.0 95 79-123 <br /> 1,1-Dichloroethene 46.4 5.0 50.0 93 77-128 <br /> Toluene 46.0 5.0 50.0 92 76-123 <br /> Trichloroethene 47.0 5.0 50.0 94 72-119 <br /> Surrogate:Dibromoflaoromethane 95.0 100 95 81-126 <br /> Surrogate:1,1-Dichloroethane-d4 93.4 100 93 73-131 <br /> Surrogate:Toluene-d8 95.3 100 95 82-129 <br /> ISurrogate:4-Bromofluorobenzene 97.3 100 97 74-131 <br /> Laboratory Control Sample Dup(5010020-BSDI) Prepared&Analyzed:01/03/05 <br /> Benzene 49.2 5.0 ug/kg 50.0 98 75-123 8 35 <br /> ' Chlombenzene 52.5 5.0 50.0 105 79-123 10 35 <br /> 1,1-Dichloroethene 51.9 5.0 50.0 104 77-128 11 35 <br /> Toluene 49.9 5.0 50.0 100 76-123 8 35 <br /> Trichloroethene 51.2 5.0 '^ 50.0 102 72-119 9 35 <br /> Surrogate:Dibromofluoromethone 93.3 100 93 81-126 <br /> Surrogate:1,2-Dichloroethane-d4 91.1 100 91 73-131 <br /> Surrogate:Toluene-d8 93.8 100 94 82-129 <br /> ' Surrogate:4-Bromofluorobenzene 96.6 100 97 74-131 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document.Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> ' Page 40 of 46 <br />