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Sequoia 885 <br /> CA 5037 <br /> Dr <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.co n <br /> tratus Environmental Inc. Project: ARCO 45469,Stockton,CA MLL0441 <br /> Cameron Park Dr.,Suite 550 Project Number: ARCO#5469, Stockton,CA Reported: <br /> #330 <br /> ameron Park CA,95682 Project Manager: Jay Johnson 01/07/03 12:15 <br /> B'TEX by EPA Method 8260B -Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC . Limits RPD Limit Notes <br /> Batch 2L20026-EPA 5030B PIT <br /> Blank(2L20026-BLKI) Prepared: 12/19/02 Analyzed: 12/20/02 <br /> Benzene ND 0.50 ug/1 <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate: l,2-Dichloroethane-d4 5.65 5.00 113 78-129 <br /> Laboratory Control Sample(2L20026-BSI) Pr aced: 12/19/02 Analyzed: 12/20/02 <br /> Benzene 9.27 0.50 ug/l 10.0 92.7 78-124 <br /> Toluene 9.41 0.50 10.0 94.1 78-129 <br /> Surrogate: l,2-Dichloroethane-d4 5.17 5.00 105 78-129 <br /> orator Control Sample Du (2L20026-BSD1) Prepared: 12/19/02 Analyzed: 12/20/02 <br /> Benzene 9.45 0.50 u <br /> g/1 10.0 94.5 78-124 1.92 12 <br /> Toluene 9.47 0.50 10.0 94,7 78-129 0.636 10 <br /> Surrogate:l,2-Dichloroethane-d4 5.40 5.00 108 78-129 <br /> Batch 2L24008-EPA 5030B P/T <br /> Blank(2L24008-BLKI) Prepared&Analyzed: 12/24/02 <br /> Benzene ND 0.50 ug/l <br /> Toiuene ND 0.50 " <br /> Ethylbenzene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:1,2-Dichloroethane-d4 5.91 5.00 118 78-129 <br /> Laboratory Control Sample(2L24008-BSI) Prepared&Analyzed: 12/24/02 <br /> Benzene 8.96 0.50 ug/1 10.0 89.6 78-124 <br /> Toluene 9.16 0.50 10.0 91,6 78-129 <br /> Surrogate: 1,2-Dichloroethane-d4 6.02 5.00 120 78-129 <br /> I <br /> oia Analytical-Morgan Hill 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 16 of 20 <br />