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885 Jarvis Dr <br /> Sequoia Macao Hill,CA 95037 <br /> (408)776-9604 <br /> Analytical wFAX A.sea)782s6a�8 <br /> Stratus Environmental Inc. Project: ARCO 45469,Stockton,CA MLL0441 <br /> 333D Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Jobnson 01107/03 12:15 <br /> BTEX by EPA Method 8260B _ Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %RFC RPD <br /> Analyte . Result Limit Units Level Result %REC . Limits RPD Limit Notes <br /> Batch 2LZ0026-EPA 5030E P/T <br /> Blank(2L20026-BLKI) Prepared: 12119/02 Analyzed: 12/20/02 <br /> Benzene NO 0.50 ugn <br /> Toluene NO 0.50 " <br /> Ethylbenzxne NO 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:1,2-Dichloroethane-d4 5.65 5.00 113 78-129 <br /> Laboratory Control Sample(2L20026-BS1)' Prepared: 12/19102 Analyzed: 12/20/02 <br /> B=Mne - 9.27 3.50 u9/1 10.0 92.7 78-124 <br /> Toluene 9.41 0,50 10.0 941 78-129 <br /> Surrogate: 1,'-Dichloroethane-d4 5.27 5.00 105 78-129 <br /> ioratory Control Sample Dup(2Y 200"6-BSD1) T Prepared: 12/19/02 Analyzed: 12/20/0_2 - <br /> Benzene 9.45 0.50 ug/l 10.0 94.5 78-124 1.92 12 <br /> Toluene 9.47 0,50 10.0 94,7 78-129 0.6363 10 <br /> Surrogate:l,2-Dichloroethane-d4 5.40 5.00 108 78-129 <br /> Batch 2L24008-EPA 5030B P/T <br /> Blank(2L24008--BLK1) Prepared&AnaIyzed: 12/24/02 <br /> Bcnzane ND 0.50 ¢g/1 <br /> Toluane ND 0.50 <br /> l✓thylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:l,2-Dichloroethane-d4 5.91 5.00 118 78-129 <br /> Laboratory Control Sample(2L24008-BSI) Prepared&Analyzed: 12/24/02 <br /> 3enzcne 8.96 0.50 ue/l 10.0 69.6 78-124 <br /> Toluene 9.16 0.50 10.0 91.6 78-129 <br /> Surragate: 1,2-Dichloroethane-d4 6.02 5.00 120 78-129 <br /> S B^31a Analytical-Morgan Fill 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 />