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4D Sequoia 885 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> �t Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.scquoialabs.com <br /> tratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLL0441 <br /> 30 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 01/07/03 12:15 <br /> BTEX 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 2L24008-EPA 5030B PIT <br /> Laboratory Control Sample Dup(2L24008-BSD1) Prepared&Analyzed: 12/24/02 <br /> Benzene 8.84 0.50 u8/1 10.0 88.4 78-124 1.35 12 <br /> Toluene 9.21 0.50 10.0 92.1 78-129 0.544 10 <br /> Surrogate: 1,2-Dichloroethane-d4 5.98 5.00 120 78-129 <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 17 of 20 <br />